Web Front-end
JS Tutorial
Detailed explanation of how JavaScript operates HTML elements and styles_Basic knowledge
Detailed explanation of how JavaScript operates HTML elements and styles_Basic knowledge
JavaScript HTML DOM element (node)
Create new HTML element
To add a new element to the HTML DOM, you must first create the element (element node) and then append the element to an existing element.
Example
<div id="div1">
<p id="p1">This is a paragraph.</p>
<p id="p2">This is another paragraph.</p>
</div>
<script>
var para=document.createElement("p");
var node=document.createTextNode("This is new.");
para.appendChild(node);
var element=document.getElementById("div1");
element.appendChild(para);
</script>
Example analysis:
This code creates a new
element:
var para=document.createElement("p");
To add text to a
element, you must first create a text node. This code creates a text node:
var node=document.createTextNode("This is a new paragraph.");
Then you have to append this text node to the
element:
para.appendChild(node);
Finally you must append the new element to an existing element.
This code finds an existing element:
var element=document.getElementById("div1");
The following code adds a new element after an existing element:
element.appendChild(para);
Delete existing HTML elements
This code appends a new element to this existing element:
Example
<div id="div1">
<p id="p1">This is a paragraph.</p>
<p id="p2">This is another paragraph.</p>
</div>
<script>
var parent=document.getElementById("div1");
var child=document.getElementById("p1");
parent.removeChild(child);
</script>
Example analysis
This HTML document contains a
elements):
<div id="div1"> <p id="p1">This is a paragraph.</p> <p id="p2">This is another paragraph.</p> </div>
Find the element with id="div1":
var parent=document.getElementById("div1");
Find the
element with id="p1":
var child=document.getElementById("p1");
Remove child elements from parent elements:
parent.removeChild(child);
lamp It would be great if you could delete an element without referencing the parent element.
But it's a pity. The DOM needs to know the element you need to delete, and its parent element.
This is a common solution: find the child element you wish to remove and then use its parentNode property to find the parent element:
var child=document.getElementById("p1");
child.parentNode.removeChild(child);
JavaScript HTML DOM - Changing CSS
The HTML DOM allows JavaScript to change the style of HTML elements.
Change HTML style
To change the style of an HTML element, use this syntax:
document.getElementById(id).style.property=new style
The following example changes the style of the
element:
Example
<html>
<body>
<p id="p2">Hello World!</p>
<script>
document.getElementById("p2").style.color="blue";
</script>
<p>The paragraph above was changed by a script.</p>
</body>
</html>
This example changes the style of the HTML element with id="id1" when the user clicks the button:
Example
<!DOCTYPE html>
<html>
<body>
<h1 id="id1">My Heading 1</h1>
<button type="button"
onclick="document.getElementById('id1').style.color='red'">
Click Me!</button>
</body>
</html>
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1664
14
1421
52
1315
25
1266
29
1239
24
Table Border in HTML
Sep 04, 2024 pm 04:49 PM
Guide to Table Border in HTML. Here we discuss multiple ways for defining table-border with examples of the Table Border in HTML.
Nested Table in HTML
Sep 04, 2024 pm 04:49 PM
This is a guide to Nested Table in HTML. Here we discuss how to create a table within the table along with the respective examples.
HTML margin-left
Sep 04, 2024 pm 04:48 PM
Guide to HTML margin-left. Here we discuss a brief overview on HTML margin-left and its Examples along with its Code Implementation.
HTML Table Layout
Sep 04, 2024 pm 04:54 PM
Guide to HTML Table Layout. Here we discuss the Values of HTML Table Layout along with the examples and outputs n detail.
HTML Input Placeholder
Sep 04, 2024 pm 04:54 PM
Guide to HTML Input Placeholder. Here we discuss the Examples of HTML Input Placeholder along with the codes and outputs.
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
HTML Ordered List
Sep 04, 2024 pm 04:43 PM
Guide to the HTML Ordered List. Here we also discuss introduction of HTML Ordered list and types along with their example respectively
HTML onclick Button
Sep 04, 2024 pm 04:49 PM
Guide to HTML onclick Button. Here we discuss their introduction, working, examples and onclick Event in various events respectively.
