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Detecting Print Events in Cross-Browser Applications
Despite the deprecation of onbeforeprint() and onafterprint() in non-IE browsers, there is a way to achieve similar functionality using window.matchMedia and window.onbeforeprint/window.onafterprint.
Using window.matchMedia
Many modern browsers now support window.matchMedia, which allows for the detection of changes in CSS media queries. By combining window.matchMedia with window.onbeforeprint/window.onafterprint, it is possible to create a cross-browser approach to detecting print events.
Event Callback
The following function can be used as the event callback for window.matchMedia:
<code class="javascript">window.matchMedia('print').addListener(function(media) { if (media.matches) { // Print is starting } else { // Print has ended } });</code>
Legacy IE and Firefox Support
For browsers that do not support window.matchMedia, it is still possible to listen for the onbeforeprint and onafterprint events directly:
<code class="javascript">$(window).on('beforeprint', beforePrint); $(window).on('afterprint', afterPrint);</code>
Note: As mentioned in the provided response, it is important to be aware that the window.matchMedia listener may fire multiple times during a single print job in some browsers. This may affect the execution of your event handlers, so consider this behavior when designing your logic.
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