Javascript HashChangeEvent Tutorial with Examples
1. HashChangeEvent
No ADS
Hash is "Anchor part" of an URL. It tells the browser to scroll the browser scrollbar to display the content area corresponding to Hash.
Ví dụ với Hash:
hash-example.html
<!DOCTYPE html>
<html>
<head>
<title>Hash Example</title>
<meta charset="UTF-8">
<style>
.content {
margin-top: 30px;
padding: 5px;
border: 1px solid #ddd;
}
</style>
</head>
<body>
<a href="#chapter1">Go to Chapter 1</a>
||
<a href="#chapter2">Go to Chapter 2</a>
||
<a href="#chapter3">Go to Chapter 3</a>
<div class="content">
<!-- Anchor 1 -->
<a id="chapter1"></a>
<h3>Chapter 1</h3>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
<!-- Anchor 2 -->
<a id="chapter2"></a>
<h3>Chapter 2</h3>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
<!-- Anchor 3 -->
<a id="chapter3"></a>
<h3>Chapter 3</h3>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
</div>
<p id="log-div"></p>
</body>
</html>HashChangeEvent
HashChangeEvent is a sub- interface of interface Event. It represents the event that occurs when the "Anchor part" on the URL is changed.
Events:
Event | Description |
hashchange | Event occurs when the "Anchor part" on the URL is changed. |
Properties:
Property | Description |
newURL | Returns the URL of the document, after the Hash has been changed |
oldURL | Returns the URL of the document, before the Hash was changed |
Basically, the newURL, oldURL properties of HashChangeEvent are supported by all browsers excluding IE.
Example with HashChangeEvent:
hashchangeevents-example.html
<!DOCTYPE html>
<html>
<head>
<title>HashChangeEvent Example</title>
<meta charset="UTF-8">
<style>
.content {
margin-top: 30px;
padding: 5px;
border: 1px solid #ddd;
}
</style>
<script>
function hashchangeHandler(evt) {
var msg = "Hash Change! \n"
+ "event.newURL= "+ evt.newURL +"\n"
+ "event.oldURL= "+ evt.oldURL ;
alert(msg);
}
</script>
</head>
<body onhashchange="hashchangeHandler(event)">
<a href="#chapter1">Go to Chapter 1</a>
||
<a href="#chapter2">Go to Chapter 2</a>
||
<a href="#chapter3">Go to Chapter 3</a>
<div class="content">
<!-- Anchor 1 -->
<a id="chapter1"></a>
<h3>Chapter 1</h3>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
Chapter 1 content <br/>
<!-- Anchor 2 -->
<a id="chapter2"></a>
<h3>Chapter 2</h3>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
Chapter 2 content <br/>
<!-- Anchor 3 -->
<a id="chapter3"></a>
<h3>Chapter 3</h3>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
Chapter 3 content <br/>
</div>
</body>
</html>No ADS
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