Javascript HashChangeEvent Tutorial
View more Tutorials:
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>
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