HTML onhaschange Event Attribute

Description

The event attribute onhaschange occurs when the anchor or hash part (starting with the # character) of the current URL changes.

An example of a hash part. Assuming we have the following URL: http://www.example.com/test.php#part3 , the hash part will be '#part3'.

To trigger the onhashchange event, you must:

Change the anchor part by setting the location.hash or location.href property of the Location object in JavaScript.
Go to another label of the current page (using the Back or Forward buttons).
Click on the link leading to the anchor tag of the page.

Syntax

<element onhaschange="script">

Values

scriptThe name of the script to use when the event has been triggered.

Example

HTML

<!DOCTYPE HTML>
<html>
<head>
</head>
<body onhashchange="myFunction()">
<p>Click on the button to change the anchor part of the current URL to #part7</p>
<button onclick="changePart()">Try it!</button>
<p id="demo"></p>
<script>
function changePart() {
    location.hash = "part7";
    var x = "Now the anchor part: " + location.hash;
    document.getElementById("demo").innerHTML = x;
}

function myFunction() {
    alert("The anchor part has changed!");
}
</script>
</body>
</html>

Result