Executing function before page gets to window.print()
I have a page that calls window.print(); at the bottom of the page. I have no way of accessing the code around window.print(); Its generated by the server and I can\'t tou
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This function works for all browsers including IE, no matter how the print is called:
/** * Adds listeners for crossbrowser print callback * @param callback - callback function */ function onPrint(callback) { window.matchMedia('print').addListener(query => query.matches ? callback() : null) window.addEventListener('beforeprint', () => callback()) } onPrint(() => console.log('printing!'))Be aware it may run the callback function twice, depending on the browser. This could be circumvented with a temporary flag.
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Try putting another
<script>tag before the one you don't have access to eg:<html><head></head><body></body><script>alert('Hello There !');</script><script>window.print();</script></html>讨论(0) -
"Basically because of IE I need to..."
If you only need support for IE, see the onbeforeprint event.
window.onbeforeprint = function () { // some code }The benefit here is that the code will not run in browsers that don't support onbeforeprint, which is pretty much every browser except IE.
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You should be able to override it like so...
var _print = window.print; window.print = function() { alert("Hi!"); // do stuff _print(); }讨论(0)
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