DOM: Change CSS

By Xah Lee. Date: . Last updated: .

Sample

Press the following buttons to change the color.

Color Me

Code

Here's the HTML code:

<p>
<span id="id13959">Color Me</span>
<button id="b1">RED</button>
<button id="b2">BLUE</button>
</p>

Here's the JavaScript code:

const xx = document .getElementById("id13959");

document .getElementById("b1").addEventListener("click", (() => ( xx.style.color="red" )) , false);

document .getElementById("b2").addEventListener("click", (() => ( xx.style.color="blue" )) , false);

This technique can be used to change the CSS value for any HTML element. All you need to do is to give the HTML tag a id attribute id=name, and define in JavaScript when should the change happen.

You can also get the element by class or tag name, if you don't have a id attribute. See: DOM: Get Elements by ID, Tag, Name, Class, CSS Selector.

CSS Attribute Name in JavaScript

CSS attribute names are dash separated, such as font-size. The corresponding property in JavaScript is camelCase: fontSize.

see:

CSS Attribute Name in JavaScript

Web Scripting Overview

  1. Browser Window Object, DOM
  2. Intro to Event-Based Programing
  3. JavaScript Load Order

DOM How-To

  1. Basic DOM Methods
  2. Get Element by ID, Tag, Name, Class, CSS
  3. Change CSS
  4. Change Node Content
  5. Create/Insert Node
  6. Remove Node
  7. Get Attribute Value
  8. Set Attribute Value
  9. Remove Attribute
  10. List/Add/Remove Class Attribute
  11. Add/Remove Event Handler
  12. Navigate DOM Tree
  13. Node Type, Name, Value

HTML Input

  1. Button
  2. Text Field
  3. Password Field
  4. Textarea
  5. Email πŸ“§
  6. Number Field
  7. Radio Button πŸ”˜
  8. Checkbox πŸ—Ή
  9. Popup Menu β–€
  10. Slider 🎚
  11. Color Picker 🌈

Web Scripting Examples

  1. Disable Right Click
  2. document.write
  3. Image Rollover
  4. Pop-up New Window
  5. Digital Clock
  6. Stopwatch
  7. Fade a Element
  8. How to Create Tooltip
  9. Falling Snow Effect
  10. Box Following Scroll

Web Scripting Misc

  1. Web Cookies
  2. Web Storage
  3. DOM: Open URL window.open
  4. Encode URL, Escape String
  5. Browser Info, Navigator Object
  6. Get URL (window.location)
  7. Find Window Width
  8. Find Element Width
  9. WebSocket
  10. Value of β€œthis” in Event Handler
  11. Event Delegation
  12. Get Current Script Tag
  13. insertAfter Element
  14. Randomize List
  15. create Document Fragment
  16. innerHTML, nodeValue, textContent, innerText?
  17. What is Live Object
  18. NodeList vs HTMLCollection
  19. Whitespace Nodes

jQuery

  1. jQuery Basics
  2. jQuery() vs querySelectorAll()
  3. Write JQuery Plugin

node.js

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Web Dev Tutorials

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  3. JavaScript
  4. JS Obj Ref
  5. DOM
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