The InsertAdjacentHTML and InsertAdjacentText methods are both used to insert content into a DOM element, but they differ in how they handle the content being inserted.
1. insertAdjacentHTML
Purpose: Inserts a string of HTML into the DOM element.
Content Handling: It parses the string as HTML, meaning it can insert not just text but also HTML tags and elements.
Use Case: This method is useful when you want to dynamically insert complete HTML content (like paragraphs, divs, links, etc.) into a specific position relative to the target element.
Example:
element.insertAdjacentHTML('beforeend', '<p>This is a <strong>HTML</strong> example.</p>');Result: The HTML content <p>This is a <strong>HTML</strong> example.</p> will be inserted as actual HTML, rendering the strong tag as bold text.
2. insertAdjacentText
Purpose: Inserts a string of text into the DOM element.
Content Handling: It treats the input as plain text and escapes any HTML-like characters (e.g., <, >, &, etc.). This means it won't interpret the text as HTML and will render it as raw text.
Use Case: This method is used when you need to insert raw text and prevent any HTML from being executed or interpreted.
Example:
element.insertAdjacentText('beforeend', 'This is <strong>text</strong>');Result: The string This is <strong>text</strong> will be inserted as plain text, so the angle brackets and the strong tag will be displayed as part of the text, rather than rendering them as HTML.
Key Differences:
- HTML Parsing: insertAdjacentHTML parses and inserts HTML, while insertAdjacentText treats the input as plain text and escapes any HTML tags.
- Security: Since insertAdjacentHTML parses HTML, it may introduce security risks (such as XSS) if the content is not sanitized properly, whereas insertAdjacentText avoids this risk by inserting the content as raw text.
In summary, use insertAdjacentHTML for HTML content and insertAdjacentText for raw text content.
In the insertAdjacentHTML and insertAdjacentText methods, the first argument specifies the position relative to the target element where the content will be inserted. The possible values for this argument are:
1. beforebegin
Position: The content is inserted immediately before the target element itself.
Example:
element.insertAdjacentHTML('beforebegin', <p>This is before the element.<p>);
The new content will appear just before the element.
2. afterbegin
Position: The content is inserted inside the target element, at the beginning (before any existing content).
Example:
element.insertAdjacentHTML('afterbegin', '<p>This is at the beginning of the element.</p>');
The new content will appear as the first child inside the element.
3. beforeend
Position: The content is inserted inside the target element, at the end (after any existing content).
Example:
element.insertAdjacentHTML('beforeend', <p> This is at the end of the element.<p>);
The new content will appear as the last child inside the element.
4. afterend
Position: The content is inserted immediately after the target element itself.
Example:
element.insertAdjacentHTML('afterend', <p>This is after the element.<p>);
The new content will appear just after the element.
Summary of Positioning:
- beforebegin: Before the element.
- afterbegin: Inside the element, before any existing content.
- beforeend: Inside the element, after all existing content.
- afterend: After the element.
These positions can be used with both insertAdjacentHTML and insertAdjacentText to control exactly where the content is added relative to the target element.
If still not clear, read below example.
Example:
Let's create a simple HTML element and show how different content can be inserted at various positions using insertAdjacentHTML.
HTML structure:
We'll create a div element with some initial content, and we'll insert additional HTML content at different positions relative to this element.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>insertAdjacentHTML Example</title>
</head>
<body>
<!-- The target element (a div with some content) -->
<div id="targetElement">
<p>Initial content of the div.</p>
</div>
<script>
const element = document.getElementById('targetElement');
// Insert HTML content at different positions
// 1. Before the element itself
element.insertAdjacentHTML('beforebegin', '<p>This is BEFORE the element.</p>');
// 2. Inside the element, at the beginning
element.insertAdjacentHTML('afterbegin', '<p>This is AT THE BEGINNING of the element.</p>');
// 3. Inside the element, at the end
element.insertAdjacentHTML('beforeend', '<p>This is AT THE END of the element.</p>');
// 4. After the element itself
element.insertAdjacentHTML('afterend', '<p>This is AFTER the element.</p>');
</script>
</body>
</html>Explanation of the Positions:
Before the element (beforebegin):
This content is inserted just before the <div id="targetElement">. It will appear above the target element.
Output: This is BEFORE the element.
At the beginning of the element (afterbegin):
This content is inserted inside the <div>, but before any existing content inside the <div>
Output: This is AT THE BEGINNING of the element. (It appears before the paragraph that was originally inside the div.)
At the end of the element (beforeend):
This content is inserted inside the <div>, but after all the existing content inside the <div>.
Output: This is AT THE END of the element. (It appears after the paragraph that was originally inside the div.)
After the element (afterend):
This content is inserted just after the <div id="targetElement">. It will appear below the target element.
Output: This is AFTER the element.
Resulting HTML structure:
After the script runs, your page will look like this:
<p>This is BEFORE the element.</p>
<div id="targetElement">
<p>This is AT THE BEGINNING of the element.</p>
<p>Initial content of the div.</p>
<p>This is AT THE END of the element.</p>
</div>
<p>This is AFTER the element.</p>Visual representation:
- The beforebegin content appears before the <div>.
- The afterbegin content appears inside the <div>, before the existing content.
- The beforeend content appears inside the <div>, after the existing content.
- The afterend content appears after the <div>.
This example should help clarify the different positions where HTML can be inserted.
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