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HTML | DOM HashChangeEvent

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  • Last Updated : 30 Jul, 2021
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The HashChangeEvent in HTML DOM is an interface between the events that are triggered when the hash of the URL has been changed. The anchor part of the URL follows # symbol.
Supported Tags 

  • <body>

Properties/Methods: 
 

  • newURL: This property is used to return the URL of the document after the fragment identifier has been changed. 
    Syntax: 
     
event.newURL
  • oldURL: This property is used to returns the URL of the document before the hash (anchor part) change. 
    Syntax: 
     
event.oldURL

onhashchange Event: This property occurred when there has been changes to the hash of the current URL. Syntax: 

<element onhashchange = "script">

Example 1: 
 

HTML




<!DOCTYPE html>
<html>
 
<head>
    <title>
        HTML DOM HashChangeEvent
    </title>
</head>
 
<body onhashchange = "GFG(event)">
 
    <h3>
        Click on the button to see the change in URL
    </h3>
     
    <button onclick = "geeks()">
        Change
    </button>
     
    <p id = "sudo"></p>
 
     
    <script>
     
        // Use location.hash property to
        // change the anchor part
        function geeks() {
            location.hash = "#GeeksforGeeks";
        }
         
        function GFG() {
            document.getElementById("sudo").innerHTML
                = "<h3>Previous URL: " + event.oldURL
                    + "<h3>New URL: " + event.newURL;
        }
    </script>
</body>
 
</html>                   


Output: 
Before Click on the button:
 

After Click on the button: 
 

Example 2: 
 

HTML




<!DOCTYPE html>
<html>
 
<head>
    <title>
        HTML DOM HashChangeEvent
    </title>
</head>
 
<body onhashchange = "GFG()">
 
    <h4>Click the button</h4>
     
    <button onclick = "geeks()">
        Click Here!
    </button>
     
    <p id = "sudo"></p>
 
     
    <script>
        function geeks() {
            location.hash = "#GeeksforGeeks";
            var x = location.hash;
            document.getElementById("sudo").innerHTML
                = "The new anchor part is: " + x;
        }
         
        function GFG() {
            alert("The hash has been changed!");
        }
    </script>
</body>
 
</html>                                     


Output: 
Before Click on the button: 
 

After Click on the button: 
 

Supported Browsers: The browser supported by DOM HashChangeEvent property are listed below: 
 

  • Google Chrome 5.0
  • Internet Explorer 8.0
  • Firefox 3.6
  • Safari 5.0
  • Opera 10.6

 


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