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    HashChangeEvent

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    The hashchange event is fired when the fragment identifier of the URL has changed (the part of the URL that follows the # symbol, including the # symbol).

    General info

    Specification
    HTML5
    Interface
    HashChangeEvent
    Bubbles
    Yes
    Cancelable
    No
    Target
    defaultView
    Default Action
    None

    Properties

    Property Type Description
    target Read only EventTarget The browsing context (<code>window</code>).
    type Read only DOMString The type of event.
    bubbles Read only boolean Does the event normally bubble?
    cancelable Read only boolean Is it possible to cancel the event?
    oldURL Read only string The previous URL from which the window was navigated.
    newURL Read only string

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 5.0 3.6 (1.9.2)
    Support for the oldURL/newURL attributes added in Firefox 6.
    8.0
    oldURL/newURL attributes are not supported.
    10.6 5.0
    Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support 2.2 1.0 (1.9.2) 9.0 11.0 5.0


    There are several fallback scripts listed on this page. Basically those scripts check the location.hash at a regular interval. Here is a version that allows only one handler to be bound to the <code>window.onhashchange</code> property:

    (function(window) {
    
      // exit if the browser implements that event
      if ( "onhashchange" in window.document.body ) { return; }
    
      var location = window.location,
        oldURL = location.href,
        oldHash = location.hash;
    
      // check the location hash on a 100ms interval
      setInterval(function() {
        var newURL = location.href,
          newHash = location.hash;
    
        // if the hash has changed and a handler has been bound...
        if ( newHash != oldHash && typeof window.onhashchange === "function" ) {
          // execute the handler
          window.onhashchange({
            type: "hashchange",
            oldURL: oldURL,
            newURL: newURL
          });
    
          oldURL = newURL;
          oldHash = newHash;
        }
      }, 100);
    
    })(window);
    

    Syntax

    window.onhashchange = funcRef;
    

    or

    <body onhashchange="funcRef();">
    

    or

    window.addEventListener("hashchange", funcRef, false);
    

    Parameters

    funcRef
    A reference to a function.

    Example

    if ("onhashchange" in window) {
        alert("The browser supports the hashchange event!");
    }
    
    function locationHashChanged() {
        if (location.hash === "#somecoolfeature") {
            somecoolfeature();
        }
    }
    
    window.onhashchange = locationHashChanged;
    

    The hashchange event

    The dispatched hashchange event has the following fields:

    Field Type Description
    newURL DOMString The new URL to which the window is navigating.
    oldURL DOMString The previous URL from which the window was navigated.

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