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JavaScript DOM Tutorial #3 - Get Elements By Class or Tag
 
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Hey gang, in this JavaScript DOM tutorial, I'll show youhow we can query the DOM for elements with a certain class name, or tag name. The methods we'll use are: - getElementsByTagName() - getElementsByClassName() ----- COURSE LINKS: + Atom editor - https://atom.io/a + GitHub Repo - https://github.com/iamshaunjp/JavaScript-DOM-Tutorial --------------------------------------------------------------------------------------------- Other tutorials: ----- JAVASCRIPT FOR BEGINNERS: https://www.youtube.com/playlist?list=PL4cUxeGkcC9i9Ae2D9Ee1RvylH38dKuET ----- CSS FOR BEGINNERS: https://www.youtube.com/playlist?list=PL4cUxeGkcC9gQeDH6xYhmO-db2mhoTSrT ----- NODE.JS TUTORIALS https://www.youtube.com/playlist?list=PL4cUxeGkcC9gcy9lrvMJ75z9maRw4byYp ----- SUBSCRIBE TO CHANNEL - https://www.youtube.com/channel/UCW5YeuERMmlnqo4oq8vwUpg?sub_confirmation=1 ============== The Net Ninja ===================== For more front-end development tutorials & to black-belt your coding skills, head over to - https://www.youtube.com/channel/UCW5YeuERMmlnqo4oq8vwUpg or http://thenetninja.co.uk ================== Social Links ================== Twitter - @TheNetNinja - https://twitter.com/thenetninjauk
Views: 25285 The Net Ninja
CSS styles in JavaScript (setting and getting) - Beau teaches JavaScript
 
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How to set CSS properties and styles in JavaScript. Also how to get CSS. This video covers style, cssText, setAttribute, and getComputedStyle. 💻 Code: https://codepen.io/beaucarnes/pen/EmVmbZ?editors=1010 🔗 Resource: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Properties_Reference 🐦 Beau Carnes on Twitter: https://twitter.com/carnesbeau ⭐JavaScript Tutorials Playlists⭐ ▶JavaScript Basics: https://www.youtube.com/playlist?list=PLWKjhJtqVAbk2qRZtWSzCIN38JC_NdhW5 ▶Data Structures and Algorithms: https://www.youtube.com/playlist?list=PLWKjhJtqVAbkso-IbgiiP48n-O-JQA9PJ ▶Design Patterns: https://www.youtube.com/playlist?list=PLWKjhJtqVAbnZtkAI3BqcYxKnfWn_C704 ▶ES6: https://www.youtube.com/playlist?list=PLWKjhJtqVAbljtmmeS0c-CEl2LdE-eR_F ▶Clean Code: https://www.youtube.com/playlist?list=PLWKjhJtqVAbkK24EaPurzMq0-kw5U9pJh - We're busy people who learn to code, then practice by building projects for nonprofits. Learn Full-stack JavaScript, build a portfolio, and get great references with our open source community. Join our community at https://freecodecamp.com Read great tech articles at https://medium.freecodecamp.com
Views: 7680 freeCodeCamp.org
Move Element to Mouse Click Position
 
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Master the handful of tricks you need to get an element to smoothly move to the exact position of your mouse click.
Views: 24630 Kirupa Chinnathambi
JavaScript for changing style of HTML element
 
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JavaScript tutorial for beginner. JavaScript can change the style of html element.
Views: 47 Web Master
8.3: Manipulating DOM Elements with html() and position() - p5.js Tutorial
 
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This video shows how to change the content of an HTML element using html() or set its position using position(). These functions are part of p5.dom.js library. Next video: https://youtu.be/NcCEzzd9BGE Support this channel on Patreon: https://patreon.com/codingtrain Contact: https://twitter.com/shiffman Send me your questions and coding challenges!: https://github.com/CodingTrain/Rainbow-Topics Link to code on Github: https://github.com/CodingTrain/Rainbow-Code p5.js: http://p5js.org For More p5.js Videos: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6Zy51Q-x9tMWIv9cueOFTFA Help us caption & translate this video! http://amara.org/v/Qbu5/
Views: 41540 The Coding Train
JavaScript Tutorial - Get Or Remove Random Array Elements
 
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Lesson Code: http://www.developphp.com/video/JavaScript/Get-or-Remove-Random-Array-Elements-Tutorial Since JavaScript does not have built in methods for selecting or removing array elements randomly, we will demonstrate how to extend the Array object to supply it with those types of methods. The first example shows how to get a random array element without affecting the original array, the second example shows how to randomly splice an element from an array which removes the target item from the array. We also show how to extend the JavaScript Array object with these custom methods.
Views: 15837 Adam Khoury
Add Javascript To Specific WordPress Pages Using Functions.php
 
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Grab Your Free 17-Point WordPress Pre-Launch PDF Checklist: http://vid.io/xqRL Add Javascript To Specific WordPress Pages https://youtu.be/Fw6VDOZYqrM Link to blog post with code: https://wplearninglab.com/add-javascript-specific-wordpress-pages/ Link to Conditional Tags in WordPress codex: https://codex.wordpress.org/Conditional_Tags If you want to add JavaScript to a specific page in WordPress this is how you do it without using a plugin. You do have edit the functions.php file, so do that carefully. Backup your existing functions file if you need to. Then just use the code from the blog post to add JavaScript to any page on your WordPress site. Stop brute force attacks before they happen with this workshop: https://wplearninglab.com/brute-force-eliminator-workshop Grab your free 17-Point WordPress Pre-Launch PDF Checklist: http://vid.io/xqRL Download your exclusive 10-Point WP Security Checklist: http://bit.ly/10point-wordpress-hardening-checklist I hope this information helps you! If you have any questions leave a comment below or ping me @WPLearningLab on Twitter. -------------- If you want more excellent WordPress information check out our website where we post WordPress tutorials daily. https://wplearninglab.com/ Connect with us: WP Learning Lab Channel: http://www.youtube.com/subscription_center?add_user=wplearninglab Facebook: https://www.facebook.com/wplearninglab Twitter: https://twitter.com/WPLearningLab Google Plus: http://google.com/+Wplearninglab Pinterest: http://www.pinterest.com/wplearninglab/
2 ways to get html  child elements w/ JavaScript
 
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In jQuery it is super easy to get the child elements of a parent HTML elements. But do you know how it works with Vanilla JavaScript? Today I want to show you 2 ways how you can use Vanilla JavaScript to get the child elements, even when you don’t know what’s in the parent element. If you like reading instead of watching a video? Please check it on: https://blog.mrfrontend.org/2017/10/2-ways-get-child-elements-javascript/ If you want to support me with creating these Frontend related videos? Please support me on Patreon: https://www.patreon.com/bePatron?c=390451 Video resources - document.querySelector: https://www.w3schools.com/jsref/met_document_queryselector.asp - document.querySelectorAll: https://www.w3schools.com/jsref/met_document_queryselectorall.asp - HTML DOM Element Object: https://www.w3schools.com/jsref/dom_obj_all.asp - element.children: https://www.w3schools.com/jsref/prop_element_children.asp - element.className: https://www.w3schools.com/jsref/prop_html_classname.asp - element.classList: https://www.w3schools.com/jsref/prop_element_classlist.asp - jQuery is not gonna help you learn JavaScript: https://www.youtube.com/watch?v=oacNCfqOu_I - How to write better CSS with BEM: https://youtu.be/ah1qRTWVVjY - http://lorempixel.com/ Enjoy! If you have comments, questions or opinions please share them in the comments! 😇 Follow us on Blog: http://blog.mrfrontend.org/ Follow us on Medium: https://medium.com/mr-frontend-community Follow us on twitter: https://twitter.com/frontendmr Follow us on Facebook: http://facebook.com/mrfrontendcommunity/
Get That CSS Out Of My JavaScript
 
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React ushered in the era of JSX, bringing HTML to our JavaScript. Now that same community is doing the same for CSS. How’d we get here? What problems are the community trying to solve? Do we hate CSS? Get the perspective of someone who has spent more time than is healthy with existing CSS-In-JS solutions. EVENT: ReactNext 2017 SPEAKER: Brian Hough PERMISSIONS: ReactNext Organizer provided Coding Tech with the permission to republish this video. CREDITS: ReactNext YouTube channel: https://www.youtube.com/channel/UC3BT8hh3yTTYxbLQy_wbk2w
Views: 7690 Coding Tech
#02 - JavaScript HTML CSS Dom - Find/Search Elements By [ ID, Class, Tag ] | DARIJA
 
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#01 - JavaScript HTML CSS Dom - Create / Append Element |: http://www.thepronets.com/2018/08/01-javascript-html-css-dom-create.html #02 - JavaScript HTML CSS Dom - Find/Search Elements By [ ID, Class, Tag ] | DARIJA : http://www.thepronets.com/2018/08/02-javascript-html-css-dom-findsearch.html For More Information : https://goo.gl/nC1dFC
Views: 447 Channel TheProNet
Get Class List For Element With JavaScript
 
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Please visit http://technomark.in/Get-Class-List-For-Element-With-JQuery.aspx for more information. Get Class List For Element With JavaScript, Get Class List For Element With Jquery, Get Class List For Element, Get Class List For Div, Get Class List For Table, Get Class List For Link, Get Class List For Button, JavaScript, Jquery
Views: 248 Admin Technomark
JavaScript using DOM to get value from html element
 
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JavaScript using DOM to get value from html element
Views: 374 Mony HO
2. getElementById in JavaScript
 
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document.getElementById - the method to "find" an HTML element and changes the element content (innerHTML). document.getElementById("txtname").style.backgroundColor="red";
Views: 51 Seema Gupta
Javascript Tutorial | Changing HTML Element's Content | Ep32
 
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Javascript works hand in hand with the DOM as we know. So how about changing text and information within the DOM. Well we can easily do this by targeting an object that represents a DOM element in Javascript and modify the innerHTML and innerText properties. This Javascript tutorial is brought to you by http://www.avelx.co.uk/ - Coding tutorials to help you grow.
Views: 720 Avelx
Modernizr Tutorial -  Checking Javascript Feature Support
 
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How to use Modernizr to check for Javascript feature support. Modernizr is a superfast javascript library for HTML5 and CSS3 feature detection especially on older browsers! Modernizr site: https://modernizr.com/
Views: 1954 Red Stapler
OnClick function and getting element by ID in javascript
 
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Fantastic course of JavaScript for free on Udemy :- https://www.udemy.com/javascript-tutorial-video/ Free certification after 100% course completion on Udemy.
Views: 24183 Flipbell IT Studio
#03 - JavaScript HTML CSS Dom DARIJA - Find/Search Elements By Objects Part 1
 
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This Video teaches you how to find and access HTML elements in an HTML page. Finding HTML Elements Often, with JavaScript, you want to manipulate HTML elements. To do so, you have to find the elements first. There are a couple of ways to do this: Finding HTML elements by id Finding HTML elements by tag name Finding HTML elements by class name Finding HTML elements by CSS selectors Finding HTML elements by HTML object collections For More Information : https://goo.gl/nC1dFC
Views: 287 Channel TheProNet
Changing Style with JavaScript
 
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Sorry, I had to re-upload this because I had an error with it. -------------------------------------------------------------------------------------------------- This is how you change the style in an HTML document using JavaScript. I recommend that you know how to set up an HTML, a CSS and a JavaScript file before viewing this video. Anyhow, Good luck!
Views: 31 Sam Lee
Javascript Form Select Change Options Tutorial Dynamic List Elements HTML5
 
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Lesson Code: http://www.developphp.com/video/JavaScript/Form-Select-Change-Dynamic-List-Option-Elements-Tutorial In this Javascript video lesson you will learn how to program dynamic select form list elements. To demonstrate the logic we will show how to change options of a select list based on the selection the user makes from the first list. A web application developer will definitely need to know how to do this when they get into form programming that involves data intake of categories and subcatories from a user.
Views: 201490 Adam Khoury
jQuery add event handler to dynamically created element
 
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Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/04/jquery-add-event-handler-to-dynamically.html In this video we will discuss, how to add event handlers to dynamically created elements. Let us understand this with an example. The following example, allows us to dynamically create new list item (li), attach a click event handler and add it to the unordered list (ul). This happens when you click "Add a New List Item" button. The problem with this approach is that we are binding a click event handler to every list item. This means if you have 500 list items, then there will be 500 event handlers in the memory and this may negatively affect the performance of your application. <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('li').on('click', function () { $(this).fadeOut(500); }); $('#btnAdd').on('click', function () { var newListItem = $('<li>New List Item</li>').on('click', function () { $(this).fadeOut(500); }); $('ul').append(newListItem); }); }); </script> </head> <body style="font-family:Arial"> <input id="btnAdd" type="button" value="Add a New List Item" /> <ul> <li>List Item</li> <li>List Item</li> </ul> </body> </html> A better way of doing the same from a performance standpoint is shown below. In this example, the click event handler is attached to the listitem (li) parent element (ul). Even if you have 500 list items, there is only one click event handler in memory. So how does this work 1. When you click on a list item (li), the event gets bubbled up to its parent (ul) as the list item (li) does not have an event handler 2. The bubbled event is handled by the the parent (ul) element, as it has a click event handler. 3. When a new list item is added dynamicaly, you don't have to add the click event handler to it. Since the newly created list item (li) is added to the same parent element (ul), the click event of this list item also gets bubbled upto the same parent and will be handled by it. <html> <head> <title></title> <script src="jquery-1.11.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $('ul').on('click', 'li', function () { $(this).fadeOut(500); }); $('#btnAdd').on('click', function () { $('ul').append('<li>New List Item</li>'); }); }); </script> </head> <body style="font-family:Arial"> <input id="btnAdd" type="button" value="Add a New List Item" /> <ul> <li>List Item</li> <li>List Item</li> </ul> </body> </html>
Views: 60270 kudvenkat
Remove Render Blocking Javascript and CSS With Autoptimize Plugin
 
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Improve site performance for your WordPress Blog and remove render-blocking Javascript and CSS. This can all be accomplished with the Autoptimize Plugin and a free tool called Critical Path CSS Generator (see link below). The correct Autoptimize plugin settings will remove render-blocking Javascript and render-blocking CSS. That is Javascript or CSS that loads above the fold, thereby impacting your website performance. By eliminating this render-blocking code from your site, you will see a drastic improvement to your website load times. https://jonassebastianohlsson.com/criticalpathcssgenerator/ And if you're interested in how to combine external javascript and/or CSS to reduce the number of HTTP requests, take a look at my latest video: https://youtu.be/I2j-cVQ7MhI
Views: 47187 Craigerson
Custom Alert Box Programming JavaScript CSS HTML Tutorial
 
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Lesson Code: http://www.developphp.com/video/JavaScript/Custom-Alert-Box-Programming-Tutorial JavaScript comes equipped with stock dialog boxes that work well enough for alerting, confirming, and prompting for values. But most of the top interactive websites create their own custom dialog windows. Creating these windows yourself gives you more control over the interaction with the user, and allows you to customize every single aspect of the dialog window. In this first video lesson we will cover creating a dynamic custom alert box dialog from scratch. In the two following videos we will cover confirm and prompt boxes.
Views: 97681 Adam Khoury
Where should the script tag be placed in html
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/11/where-should-script-tag-be-placed-in.html In this video we will discuss, where should the script tag be placed in the html. Should it be placed in the body or head section of the page. In general the script tag can be placed either in the head or body section. Let's look at a few examples : Example 1 : Script tag in the head section [html] [head] [script type="text/javascript"] alert("Welcome to JavaScript Tutorial"); [/script] [/head] [body] [form id="form1" runat="server"] [/form] [/body] [/html] Example 2 : Script tag in the body section [html] [head] [/head] [body] [form id="form1" runat="server"] [/form] [script type="text/javascript"] alert("Welcome to JavaScript Tutorial"); [/script] [/body] [/html] In Example 1 we placed the script tag in the head section and in Example 2, we placed it in body section. In both the cases JavaScript works as expected. Example 3 : Sets the background color of the TextBox to red. [html] [head] [/head] [body] [form id="form1" runat="server"] [asp:TextBox ID="TextBox1" runat="server"][/asp:TextBox] [/form] [script type="text/javascript"] document.getElementById("TextBox1").style.backgroundColor = "red"; [/script] [/body] [/html] Example 4 : This is same as Example 3, except we moved the script tag to the head section. In this case the script will not work as expected. Depending on the browser you are using you get one of the following JavaScript error. Firefox - TypeError: document.getElementById(...) is null Chrome - Uncaught TypeError: Cannot read property 'style' of null IE - Unable to get property 'style' of undefined or null reference To see these JavaScript errors press F12 which launches developer tools. F12 works for all the 3 browsers. [html] [head] [script type="text/javascript"] document.getElementById("TextBox1").style.backgroundColor = "red"; [/script] [/head] [body] [form id="form1" runat="server"] [asp:TextBox ID="TextBox1" runat="server"][/asp:TextBox] [/form] [/body] [/html] Why did the JavaScript did not work in this case JavaScript code is present before the textbox control. By the time the JavaScript code is executed, the textbox is still not loaded into browser DOM (Document Object Model). This is the reason JavaScript can't find the textbox and throws a NULL reference error. In Part 6, we discussed that, in general it is a good practice to store JavaScript in an external .js file. So, if the JavaScript is present in an external file and if you are referencing it on a page using [script] element, where should such [script] element be placed. To answer this question, first let's understand what happens when a browser starts loading a web page. 1. The browser starts parsing the HTML 2. When the parser encounters a [script] tag that references an external JavaScript file. The parser stops parsing the HTML and the browser makes a request to download the script file. Until the download is complete, the parser is blocked from parsing the rest of the HTML on the page. 3. When the download is complete, that's when the parser will resume to parse the rest of the HTML. This means the page loading is stopped until all the scripts are loaded which affects user experience. In general, the suggested good practice is to place the [script] tag just before the closing [body] tag, so it doesn't block the HTML parser. However, modern browsers support async and defer attributes on scripts. These attributes tell the browser it's safe to continue parsing while the scripts are being downloaded. But even with these attributes, from a performance standpoint it is still better to place [script] tag just before closing [body] tag. According to HTTP/1.1 specification browsers download no more than two components in parallel. So, if the page has several images to download and if you place [script] tags at the top of the page, the script files start to download first which blocks the images download which adds to the total page load time.
Views: 93678 kudvenkat
CSS in JavaScript - Front-end London (FEL)
 
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In this talk, Michele Bertoli goes through the main problems with CSS at scale and he shares some interesting JavaScript-based solutions, from Inline Styles to CSS Modules. Are you ready to enter the magical world of CSS in JS? ▼ Links mentioned in the talk ▼ https://github.com/michelebertoli/css-in-js https://yplanapp.com/ ▼ Slides ▼ https://speakerdeck.com/michelebertoli/css-in-js ▼ Speaker ▼ Michele Bertoli (https://twitter.com/michelebertoli?lang=en-gb) ▼ Event ▼ This talk was part of the Front-end London (fel) April 2016 (http://www.frontendlondon.co.uk/archive). ▼ Transcript ▼ https://blog.pusher.com/css-in-javascript/ ▼ Video by Pusher ▼ Pusher is a hosted service with APIs, developer tools and open source libraries that greatly simplify integrating real-time functionality into web and mobile applications. Pusher will automatically scale when required, removing all the pain of setting up and maintaining a secure, real-time infrastructure. Pusher is already trusted to do so by thousands of developers and companies like GitHub, MailChimp, the Financial Times, Buffer and many more. Getting started takes just a few seconds: simply go to pusher.com and create a free account. Happy hacking! ▼ More from Pusher ▼ Subscribe to Pusher: https://www.youtube.com/c/pusherrealtime?sub_confirmation=1 Front-end London playlist:https://www.youtube.com/playlist?list=PL8xuokhAnn4pZ6tAyFobOcUrLI2MNKZbU
Views: 1096 Pusher
Use JavaScript to Hide or Show a Portion of a Form
 
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Use a JavaScript IF Statement to hide the shipping part of an order form if it is the same as the billing part of the form. If statement called by an onclick checkbox. Demo file: http://www.ralphphillips.com/youtube/show-hide-fieldset.html
Views: 20044 Ralph Phillips
HTML 5 Tutorial Progress Bar For Progressive Javascript Events Processing or File Upload
 
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Lesson Code: http://www.developphp.com/video/HTML/Progress-Bar-Progressive-Javascript-Events-Processing Learn how to tie the HTML5 progress element to progressive Javascript events, whatever that progressive event may be. Come learn HTML and HTML5 with us: http://www.developphp.com
Views: 68848 Adam Khoury
JavaScript Tutorial
 
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Get the Cheat Sheet Here : http://goo.gl/TxNsQO Best Book on JavaScript : http://amzn.to/1WbMYvm Support Me on Patreon : https://www.patreon.com/derekbanas 00:22 Introduction 03:27 Variables 04:27 Math 12:00 Random Numbers 13:21 Strings 17:24 Styling Strings 18:14 If 21:44 Switch 23:04 Ternary Operator 23:55 While 24:51 Do While 25:52 For 27:37 For In 28:39 Arrays 34:42 Functions 36:41 Pass Function as Parameter 39:42 Receive Variable Number of Arguments 40:55 Return Variable Number of Arguments 42:02 Recursive Functions 43:54 Event Handling 46:24 Mouse Events 51:30 Key Events 54:02 Change Tag Value 56:41 Change Class 58:02 Change Input Element 59:20 Mouse X / Y Coordinates 1:01:42 Get Elements by Tag Name 1:03:00 Element Styling 1:05:48 Manipulating URLs 1:09:37 Editing Child Nodes 1:15:08 Setting Attributes 1:18:11 Adding Elements 1:19:50 OO JavaScript 1:28:33 Form Validation 1:34:54 Exception Handling
Views: 1182110 Derek Banas
JavaScript Tutorial | Modals & Loops | Part 2
 
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In the previous video we added JavaScript to let our modal appear and disappear after a “click” event. Unfortunately, using the "querySelector" to open the modal only works for a single element. Time to find out how to select multiple elements of the same class with "querySelectorAll" and also how to use loops and "addEventListener" on our page. ---------- Join our JavaScript Bootcamp: https://www.udemy.com/javascript-bootcamp-2016/learn/v4/?couponCode=ACAD_M Starting Code: https://github.com/academind/web-development-beginners-guide/tree/13.01-js-modal-queryall-starting-code Finished Code: https://github.com/academind/web-development-beginners-guide/tree/13.02-js-modal-queryall-finished-code Want to learn something totally different? Check out all other courses: https://academind.com/learn/our-courses ---------- • You can follow Max on Twitter (@maxedapps). • And you should of course also follow @academind_real. • You can also find us on Facebook.(https://www.facebook.com/academindchannel/) • Or visit our Website (https://www.academind.com) and subscribe to our newsletter! See you in the videos! ---------- Academind is your source for online education in the areas of web development, frontend web development, backend web development, programming, coding and data science! No matter if you are looking for a tutorial, a course, a crash course, an introduction, an online tutorial or any related video, we try our best to offer you the content you are looking for. Our topics include Angular, React, Vue, Html, CSS, JavaScript, TypeScript, Redux, Nuxt.js, RxJs, Bootstrap, Laravel, Node.js, Progressive Web Apps (PWA), Ionic, React Native, Regular Expressions (RegEx), Stencil, Power BI, Amazon Web Services (AWS), Firebase or other topics, make sure to have a look at this channel or at academind.com to find the learning resource of your choice!
Views: 3643 Academind
HTML5 Canvas Tag Tutorial Learn to Draw and Animate Using Javascript
 
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Lesson Code: http://www.developphp.com/video/HTML/Canvas-Draw-Function-Set-Up In this video lesson series you can learn all about how to draw into the HTML5 canvas tag using Javascript. The canvas tag is aptly named. It supplies you with a means of drawing things through script and it renders in a browser. Things can be stationary or animated inside of a canvas tag. We can use Javascript to draw what we want in the canvas so in this series we will demonstrate some of the drawing methods one can use. We will also demonstrate how to animate things inside of the canvas tag using Javascript.
Views: 120275 Adam Khoury
Assigning event handlers in JavaScript using DOM object property
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/assigning-event-handlers-in-javascript.html In JavaScript there are several ways to associate an event handler to the event. In Part 36, we discussed, associating event handler methods to events using the attributes of HTML tags. In this video we will discuss using DOM object property to assign event handlers to events. First let us understand, what is DOM DOM stands for Document Object Model. When a browser loads a web page, the browser creates a Document Object Model of that page. The HTML DOM is created as a tree of Objects. Example : [html] [head] [title]My Page Title[/title] [/head] [body] [script type="text/javascript"] [/script] [div] [h1]This is browser DOM[/h1] [/div] [/body] [/html] JavaScript can be used to access and modify these DOM objects and their properties. For example, you can add, modify and remove HTML elements and their attributes. Along the same lines, you can use DOM object properties to assign event handlers to events. We will discuss the DOM object in detail in a later video session. We will continue with the same examples that we worked with in Part 36. Notice that in this case, we are assigning event handlers using the DOM object properties (onmouseover & onmouseout) instead of using the attributes of the HTML tag. We are using this keyword to reference the current HTML element. In this example "this" references the button control. [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] document.getElementById("btn").onmouseover = changeColorOnMouseOver; document.getElementById("btn").onmouseout = changeColorOnMouseOut; function changeColorOnMouseOver() { this.style.background = 'red'; this.style.color = 'yellow'; } function changeColorOnMouseOut() { this.style.background = 'black'; this.style.color = 'white'; } [/script] The following example is same as the above. In this case we are assigning an anonymous function to onmouseover & onmouseout properties. [input type="button" value="Click me" id="btn" /] [script type="text/javascript"] document.getElementById("btn").onmouseover = function () { this.style.background = 'red'; this.style.color = 'yellow'; } document.getElementById("btn").onmouseout = function () { this.style.background = 'black'; this.style.color = 'white'; } [/script] If an event handler is assigned using both, i.e an HTML attribute and DOM object property, the handler that is assigned using the DOM object property overwrites the one assigned using HTML attribute. Here is an example. [input type="button" value="Click me" id="btn" onclick="clickHandler1()"/] [script type="text/javascript"] document.getElementById("btn").onclick = clickHandler2; function clickHandler1() { alert("Handler set using HTML attribute"); } function clickHandler2() { alert("Handler set using DOM object property"); } [/script] Using this approach you can only assign one event handler method to a given event. The handler that is assigned last wins. In the following example, Handler2() is assigned after Handler1. So Handler2() owerites Handler1(). [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] document.getElementById("btn").onclick = clickHandler1; document.getElementById("btn").onclick = clickHandler2; function clickHandler1() { alert("Handler 1"); } function clickHandler2() { alert("Handler 2"); } [/script]
Views: 49535 kudvenkat
#06 - JavaScript HTML CSS Dom -  Elements - Get, Set Attribute Value | DARIJA
 
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Bonjour à tous. Groupe Facebook : https://goo.gl/ECih0l voir aussi les cours en langage C : www.youtube.com/c/channelthepronet Official Facebook ::http://bit.ly/2a3jAsx Follow on Google+ :http://bit.ly/2fKkKIM Subscribe Youtube :http://bit.ly/2akBJ6m Groupe Facebook: http://bit.ly/2ajGBsP Site Web :https://goo.gl/PtDhDf
Views: 109 Channel TheProNet
Javascript Tutorial | Changing an Element's Style | Ep33
 
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Javascript works hand in hand with the DOM as we know. So how about changing text and information within the DOM. Well we can easily do this by targeting an object that represents a DOM element in Javascript and modify the innerHTML and innerText properties. This Javascript tutorial is brought to you by http://www.avelx.co.uk/ - Coding tutorials to help you grow.
Views: 593 Avelx
JavaScript Animated. How To Change RD Map Style
 
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This video tutorial is going to show you how to change RD Map style in your JS Animated template. / Subscribe Our Channel: http://goo.gl/zjoR8Z More Premium JavaScript Website Themes you may find here: http://www.templatemonster.com/completely-javascript-website-templates/?utm_source=youtube&utm_medium=link&utm_campaign=cjstuts83 And also HTML 5 plus Javascript Templates: http://www.templatemonster.com/html-javascript-website-templates/?utm_source=youtube&utm_medium=link&utm_campaign=jshtuts83 Follow us: Facebook http://goo.gl/3yXKEu, Twitter http://goo.gl/NR5fDK, LinkedIn http://goo.gl/qDZeEO, Dribbble http://goo.gl/UwqX48, Pinterest http://goo.gl/Tp8Je5
Views: 84 TemplateMonster
HTML iframe Example and Tutorial
 
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http://www.LittleWebHut.com This video demonstrates how to use the HTML / XHTML iframe tag. It will cover the basic usage for the iframe tag and demonstrate the scr, width, height, scrolling, name, and id attributes. This video will also show how to change the contents of the iframe tag using an anchor tag with its target attribute.
Views: 345719 tutor4u
How to Style a Document Element Using CSS3 and HTML5
 
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In this vide I ( TRC ) Shows you how to style a document element using CSS3 and HTML5 while working in the Free Code Camp online editor. ▼ Time Stamps and quick navigation ▼ 2:01 - This is where I start actually writing Code 4:30 - The differences between classes and Id's in CSS 6:16 - styling multiple elements with a CSS Class 7:41 - Change the Font Size of an element using CSS. This also where I learned that Free Code Camp online editor has auto complete 14:05 - The Different between Serif and sans-serif fonts 15:37 - What a monospace font is 17:02 - How to change your settings in Free Code Camp 17:44 - The Basics of importing a google font ▼ Follow me on social media (updated daily!) ▼ FaceBook: https://www.facebook.com/TheCasadaro Twitter: https://twitter.com/The_Casadaro_ Linkedin: https://www.linkedin.com/in/casadaro instaGtram: https:// youtube: https://www.youtube.com/channel/UCiuJ529_bakAN-zjxnyDDaw_ SnapChat: The_Casadaro_ ▼ Follow me on social media (updated daily!) ▼ FaceBook: https://www.facebook.com/TheCasadaro Twitter: https://twitter.com/The_Casadaro_ Linkedin: https://www.linkedin.com/in/casadaro instaGtram: https:// youtube: https://www.youtube.com/channel/UCiuJ529_bakAN-zjxnyDDaw_ SnapChat: The_Casadaro_ ▼ You can also donate bitcoin via this wallet ▼ 1DWJ4XWu9VgA9J2NwgdgVvymMQLdLVoKKT ▼ Get Stickers ▼ [https://www.stickermule.com/user/1070640186/stickers] ▼ Check out my BLOG ▼ [https://medium.com/@TheRealCasadaro]
Views: 710 TheRealCasadaro
Changing styles | HTML/JS: Making webpages interactive | Computer Programming | Khan Academy
 
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Created by: pamela (KA teacher) Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/computing/computer-programming/html-css-js/html-js-dom-modification/p/challenge-style-guide?utm_source=YT&utm_medium=Desc&utm_campaign=computerprogramming Watch the next lesson: https://www.khanacademy.org/computing/computer-programming/html-css-js/html-js-dom-modification/p/changing-css-classes?utm_source=YT&utm_medium=Desc&utm_campaign=computerprogramming Missed the previous lesson? https://www.khanacademy.org/computing/computer-programming/html-css-js/html-js-dom-modification/p/changing-attributes?utm_source=YT&utm_medium=Desc&utm_campaign=computerprogramming Computer Programming on Khan Academy: Learn how to program drawings, animations, and games using JavaScript & ProcessingJS, or learn how to create webpages with HTML & CSS. You can share whatever you create, explore what others have created and learn from each other! About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy's Computer Programming channel: https://www.youtube.com/channel/UCzYDKG5mmfPPIosXuQ1PvEA?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
JavaScript - 식별자 API (3/4) : Element.className
 
03:39
http://opentutorials.org/module/904/6682
Views: 8047 생활코딩
How to use the jQuery CSS method to style HTML elements
 
02:41
https://blog.kevinchisholm.com You can find plenty more articles like this on my blog!
Views: 9 Kevin Chisholm
Learn HTML, CSS, and JavaScript -  Images and Head Style Section - Lesson 8 for Beginners
 
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#javascript #programming #html #css Lesson 8 covers adding images to your HTML document. It also covers creating style classes in a style section of your head section of your document. Come join us each week for lessons published each Wednesday. Each new lesson will walk you through using one or more HTML elements. Eventually, we will also cover CSS and Javascript. Please follow along with each lesson. Once you are done with the series, if you would like, you can upload your pages to http://thecodingzoo.com Stick around after the lesson for bloopers. The entire playlist: https://www.youtube.com/watch?v=ofbWa... Book Marks: 2:20 NotePad ++ Editor Install 5:24 Style Element in Head 7:37 Element CSS Selector and CSS Background Color Property 9:33 Class Name CSS Selector and CSS color Property 12:21 Padding CSS Property 13:56 Margin CSS Property 15:44 Adding Image and sizing it Affiliate Links - Equipment we use: Main Camera: https://goo.gl/o3yK8w Backup Camera: http://amzn.to/2DYSazo CyberPowerPC: Desktop for video editing: https://goo.gl/KxJyrC Shure VPF83 Microphone: http://amzn.to/2ECUPzO Blue Microphone: http://amzn.to/2GKmxvs Editing/Color Grading Software: http://amzn.to/2DT8JwD Sound by Feeling Free - Nicolai Heidlas - https://soundcloud.com/nicolai-heidla...
CSS Positioning Tutorial #4 - Floating Elements
 
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Hey ninjas, in this CSS Positioning tutorial, I'll introduce you to floating elements. CSS floats are one of the most powerful and widely used CSS positioning properties, but can be a little tricky to get your head around at first! SUBSCRIBE TO CHANNEL - https://www.youtube.com/channel/UCW5YeuERMmlnqo4oq8vwUpg?sub_confirmation=1 ========== JavaScript for Beginners Playlist ========== https://www.youtube.com/playlist?list=PL4cUxeGkcC9i9Ae2D9Ee1RvylH38dKuET ========== CSS for Beginners Playlist ========== https://www.youtube.com/playlist?list=PL4cUxeGkcC9gQeDH6xYhmO-db2mhoTSrT ========== HTML for Beginners Playlist ========== https://www.youtube.com/playlist?list=PL4cUxeGkcC9ibZ2TSBaGGNrgh4ZgYE6Cc ========== The Net Ninja ============ For more front-end development tutorials & to black-belt your coding skills, head over to - https://www.youtube.com/channel/UCW5YeuERMmlnqo4oq8vwUpg or http://thenetninja.co.uk ========== Social Links ========== Twitter - @TheNetNinja - https://twitter.com/thenetninjauk
Views: 74508 The Net Ninja
JavaScript Tracker v3 Demo
 
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A chrome extension tracks front-end JavaScript that uses DOM / jQuery APIs to manipulate html dom elements (e.g., change style, attach event listener) at runtime. For more details, please check [GitHub]: https://github.com/pilagod/js-tracker [Chrome Web Store]: https://goo.gl/6vT2Rd
Views: 5950 Pilagod Ho
html5 canvas animation basics tutorial for beginners javascript programming lesson
 
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Lesson Code: http://www.developphp.com/video/HTML/Canvas-Animation-Basics-Tutorial Learn the entry level basics of animation programming on the HTML5 canvas element using Javascript to perform the animated effect. The 3 basic steps to canvas tag animation programming are (1) Draw your assets (2) Clear the canvas (3) Redraw your assets into a new location or state of being. Your animation speed and fluidity depends on the time interval you set for a setTimeout() or setInterval() method in Javascript. It also depends on the incremental factors of any animations.
Views: 234604 Adam Khoury
How to Change CSS Styles in JavaScript--Telugu 58-vlr training
 
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How to Change CSS Styles in JavaScript--Telugu 58 For Telugu https://www.youtube.com/watch?v=PqLXL5FJKCo For English https://www.youtube.com/watch?v=63NFjfZULBs website:http://www.vlrtrain.com/ JavaScript HTML DOM Changing CSS CSS background-position property Setting CSS Styles using JavaScript Searches related to how to change CSS styles in javascript javascript set css style Key Words: Javascript Training Javascript Trianing videos Free Training Videos free Javascript Training Videos Online Training Videos for Javascript Client Side Scripting Videos Telugu Software Training Videos Telugu Javscript Training Videos Javascript Online Training Browser With Javascript Progamming with Javascript Learn Javascript Programming Javascript Code Website Javascript Learn Javascript Traing Videos Javascript with Examples Free Telugu Javascript Javascript Videos Javascript Codeing Training Videos Brower with Javascript Training Videos How to Learn Javascript How to Learn Javascript in Telugu How to Learn Javascript in English Javascript for Website
Views: 611 VLR Training
Javascript Tutorial |  Targeting DOM Elements | Ep31
 
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Returning the entire document object is not beneficial when working with the DOM. In this case we'll run some methods on the document object and have a single object returned for one DOM node. Modifying this object will effect the DOM element itself, also we'll look at targeting multiple DOM element's that are returned in an array. This Javascript tutorial is brought to you by http://www.avelx.co.uk/ - Coding tutorials to help you grow.
Views: 736 Avelx
Javascript Tutorial | Final Project | Ep36
 
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This final project will sum up most of what we’ve already learn’t throughout this course. It will consist of three simple drop down menus with each menu changing a CSS property on a div element. We’ll be looking at adding an event onto each select drop down via a for loop. Once the events have been added we can then review the callback function or what’s know as a higher order function.
Views: 1150 Avelx
Controlling focus with tabindex -- A11ycasts #04
 
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Whenever possible you want to use native HTML elements for your custom controls. The button tag, for instance, is very easy to style, and has built-in keyboard support and semantics. But there are times when you need to build something that doesn't have a corresponding native element. Sometimes you've just gotta build something new! In these cases it's important to remember to add in crucial keyboard support so all of your users can access your content. The first step is to make sure that a user can actually focus your control. To accomplish this you can use the tabindex attribute. Today on the show we'll cover the various states of tabindex, when and how to use it, and point out one very important gotcha! Watch all A11ycasts episodes: https://goo.gl/06qEUW Subscribe to the Chrome Developers YouTube channel for updates on new episodes of A11ycasts: http://goo.gl/LLLNvf
Views: 155236 Google Chrome Developers
Focus Event in JavaScript (Hindi)
 
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Focus Event in JavaScript You can find out our HTML Complete Video tutorials : http://goo.gl/O254f9 CSS Complete Video Tutorial Playlist: http://goo.gl/On2Bh1 Feel free to share this video Core JavaScript Complete Video Tutorial Playlist https://goo.gl/A517jQ Advance JavaScript Complete Video Tutorial Playlist https://goo.gl/mNTBhU Check Out Our Other Playlists: https://www.youtube.com/user/GeekyShow1/playlists SUBSCRIBE to Learn Programming Language ! http://goo.gl/glkZMr Learn more about subject: http://www.geekyshows.com/ __________________________________________________________ If you found this video valuable, give it a like. If you know someone who needs to see it, share it. If you have questions ask below in comment section. Add it to a playlist if you want to watch it later. ___________________________________________________________ T A L K W I T H M E ! Business Email: [email protected] Youtube Channel: https://www.youtube.com/c/geekyshow1 Facebook: https://www.facebook.com/GeekyShow Twitter: https://twitter.com/Geekyshow1 Google Plus: https://plus.google.com/+Geekyshowsgeek Website: http://www.geekyshows.com/ ___________________________________________________________ Make sure you LIKE, SUBSCRIBE, COMMENT, and REQUEST A VIDEO :) ___________________________________________________________
Views: 223 Geeky Shows
JQuery Tutorial 20 - Select Element and change Style using css method
 
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Views: 1149 Ranga Rajesh Kumar
4 Places To Edit WordPress CSS | WP Learning Lab
 
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Grab Your Free 17-Point WordPress Pre-Launch PDF Checklist: http://vid.io/xqRL 4 Places To Edit WordPress CSS | WP Learning Lab To edit WordPress CSS you first need to know all the places you can find CSS. There are 4 common places. You may not have all these locations on your website because some of them are theme-dependent. The possible CSS locations are: 1. The WordPress theme or child theme stylesheet (this one you have for sure) 2. The theme options panel (this one you may or may not have) 3. A CSS editor on each page and post (this one you may or may not have) 4. Inline CSS applied directly to HTML elements on the page (this one you will have only if you're written it) Let's go through each one. The WordPress theme or child theme stylesheet When inside your WordPress dashboard if you click on Appearance then Editor you will be able to edit theme or child theme files. Usually the style.css is loaded first by default. If it's not loaded find the style.css file in the list of files on the right side of the editor page. When you find it, click on it. That will open the CSS file in WordPress editor. At this point you can make edits to the file and click on the Update button to save your changes. How to actually code CSS is beyond the scope of this tutorial, but you can check out my CSS channel over here (https://www.youtube.com/channel/UCeFLITjl2v9vtIkftw9UMsw) The danger in editing CSS directly in the stylesheet of the main theme is that what you create may be over written when the theme updates. You get around this problem by creating a child theme (see a tutorial on how to create a WordPress child theme here: https://www.youtube.com/watch?v=Z8n1h-85SMQ). The theme options panel Not every theme has a theme options panel, but the ones that do make WordPress CSS so much easier to edit. You can simply add CSS to the CSS box in the theme options and click save changes. The upside is that theme updates won't erase the CSS code you create. A CSS editor on each page and post Some themes, like Avada and Divi, give you the option of insert CSS code right into the individual posts and pages of your website. This is great for CSS that you want to be only one page. I would only recommend doing this if you're putting more than 100 lines of CSS into the page. If it's less than 100 lines of CSS you're better to put into the main stylesheet so you stay organized. If it's more than 100 lines of CSS code that only need to exist on one page then your site will load a little bit faster overall by not loading all that CSS into every page. Inline CSS The last place in our list and the last place you'd want to create CSS code is right in your HTML elements. This is called inline CSS and can be difficult to work with for two big reasons. First, you can't apply the CSS to more than one element at a time. So if you want to style all the paragraphs on the page in the same way you have to apply the same CSS code over and over again to each p tag. This is a pain to administer and will result in larger than needed page sizes. Second, if you add inline CSS to lots of pages it will be come difficult to remember what CSS you applied where. Then trying to find it an make edits will become a pain. Inline CSS also takes precedent over CSS in the stylesheet. So you might be make changes to CSS in the stylesheet, but nothing is happening on the page. You'll go through a frustrating few minutes before you figure out the CSS is actually inline on the page. I hope this information helps you! If you have any questions leave a comment below or ping me @WPLearningLab on Twitter. -------------- If you want more excellent WordPress information check out our website where we post WordPress tutorials daily. https://wplearninglab.com/ Connect with us: WP Learning Lab Channel: http://www.youtube.com/subscription_center?add_user=wplearninglab Facebook: https://www.facebook.com/wplearninglab Twitter: https://twitter.com/WPLearningLab Google Plus: http://google.com/+Wplearninglab Pinterest: http://www.pinterest.com/wplearninglab/

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