HashChangeEvent
The HashChangeEvent
interface represents events that fire when the fragment identifier of the URL has changed.
The fragment identifier is the part of the URL that follows (and includes) the #
symbol.
Properties
This interface also inherits the properties of its parent, Event
.
HashChangeEvent.newURL
Read only-
The new URL to which the window is navigating.
HashChangeEvent.oldURL
Read only-
The previous URL from which the window was navigated.
Methods
This interface has no methods of its own, but inherits the methods of its parent, Event
.
Examples
Syntax options for a hash change
You can listen for the hashchange
event using any of the following options:
window.onhashchange = funcRef;
or
<body onhashchange="funcRef();">
or
window.addEventListener("hashchange", funcRef, false);
Basic example
function locationHashChanged() {
if (location.hash === '#somecoolfeature') {
somecoolfeature();
}
}
window.addEventListener('hashchange', locationHashChanged);
Polyfill
There are several fallback scripts listed on the Modernizr GitHub page. Basically, those scripts check the hash
property of Window.location
at a regular interval. Here is a version that allows only one handler to be bound to the onhashchange
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);
Specifications
Specification |
---|
HTML Standard # the-hashchangeevent-interface |
Browser compatibility
BCD tables only load in the browser