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Is it possible to trigger a javascript event when a user prints a page? I would like to remove a dependancy on a javascript library, when a user opts to print a page, as the library is great for screen but not for print.
Any idea how to achieve this?
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HTML events are handled by JavaScript. When an event occurs, it requires some action to be taken. This action can be accomplished through JavaScript event handlers. In addition to JavaScript, jQuery which is equivalent to JavaScript in terms of functionality can also be used to trigger events in a HTML document.
JavaScript | Window print() Method. Page print in JavaScript is a simple code in JavaScript used to print the content of the web pages. The print() method prints the contents of the current window.
JavaScript does not have any print object or print methods. You cannot access output devices from JavaScript. The only exception is that you can call the window.print() method in the browser to print the content of the current window.
The window. print() method calls the browser's build in print support plugin to print the current DOM page. you can check the documentation, it doesn't support any argument or settings. to setup the print, you can only utilize the browser's GUI( ex. enable or disable background graphics etc.)
For anyone stumbling upon this answer from Google, let me try to clear things up:
As Ajay pointed out, there are two events which are fired for printing, but they are not well-supported; as far as I have read, they are only supported in Internet Explorer and Firefox (6+) browsers. Those events are window.onbeforeprint and window.onafterprint, which (as you'd expect) will fire before and after the print job.
However, as pointed out in Joe's link (https://stackoverflow.com/a/9920784/578667), that's not exactly how it is implemented in all cases. In most cases, both events fire before the dialog; in others, script execution might be halted during the print dialog, so both events may fire at the same time (after the dialog has been completed).
For more information (and browser support) for these two events:
https://developer.mozilla.org/en-US/docs/DOM/window.onbeforeprint
https://developer.mozilla.org/en-US/docs/DOM/window.onafterprint
The short answer: if you're hoping to interfere with the print flow, don't. If you're hoping to trigger code after printing, it's not going to work how you're wanting; expect poor browser support, and try to degrade gracefully.
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