How Can I Reliably Detect Changes in Window Location Hash in My Ajax Application?

Detecting Changes in Window Location Hash

In Ajax applications that utilize hash-based navigation, detecting changes in window.location.hash can be crucial. However, browser limitations can complicate this task, particularly when using the browser's back button.

Solution

Despite browser limitations, an effective solution involves implementing a polling interval. This interval continuously checks the current hash and compares it against its previous value. Upon detecting a change, a "changed" event is fired, allowing subscribers to respond to the hash modification.

Improved Solution with jQuery

For jQuery users, a more convenient approach exists. jQuery's event system enables listening for hashchange events on the window object.

$(window).on('hashchange', function() {
  // Handle hash change...
});

Resolving Browser Support Issues

If native browser support for hashchange is lacking, jQuery provides a special events feature. This feature allows for event setup to address support deficiencies. In this case, a timer can be configured to poll for changes and trigger the jQuery event when a modification is detected.

By utilizing jQuery's events system and special events feature, developers can avoid the complexities of browser support issues while confidently handling hash changes in their Ajax applications.

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