jquery - Unable to set background-image property in "beforeunload" event -

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i'm trying solve ie-problem of not animating .gif image, when displayed in beforeunload or unload events. step this answer, found not working, played little bit code.

i have come that:

var     spinner = $('.spinner-large'),     spinnerbackgroundimage = spinner.css('background-image');  console.log(spinnerbackgroundimage); console.log($('.spinner-large').css('background-image'));  spinner.css('background-image', spinnerbackgroundimage);  console.log(spinner.css('background-image'));  spinner.show();

this not working. spinner displayed, there no background image. , console contains:

backend-extra.js:97     url(http://127.0.0.1/images/spinner-large.gif) backend-extra.js:98     url(http://127.0.0.1/images/spinner-large.gif) backend-extra.js:102    none

what missing? why can't set entire background-image property value jquery?

note, don't want set path image in background-image property, because know, how should this. i'm asking: why background-image property value reset none, when i'm trying change above method?

edit: here jsfiddle above problem. seems 100% beforeunload event-related issue. when clicking button, same code works fine, while when refreshing page or navigating other url, console have same output above -- property not set.

there should quotes around url:

background-image: url("http(...)spinner-large.gif");

invalid formatting reason enough turn none. otherwise might helpful create jsfiddle, codepen, that. not seem obvious behavior.

edit: beyond me, doesn't seem fault either. i'd suggest working around it. possible in ugly way, not animating background on ie. (gracefully degrading should okay anyway!)


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