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https://stackoverflow.com/questions/36283776/how-can-i-detect-support-for-iframe-onload-without-browser-sniffing
How can I detect support for iframe onload without browser sniffing? Ask Question ... Once the data has been processed by the ASP.NET handler and the iframe receives the results, the onload event is 'supposed' to hide the spinner. ... I have also tried adding the onload event without jQuery or addEventListener by embedding it directly in the ...
https://stackoverflow.com/questions/5947528/iframe-onload-event
We have a system, where our old asp-pages run in iframe, and there are dozens of them. All of them use the same old syntax. First init call is made correctly, but the second one is done as top-most. This basically messes things up, because in the iframe window.top does not have functions that there should be, because it is the iframe window itself.
https://www.dyn-web.com/tutorials/iframes/onload/
Another option: you can include an onload handler in the iframed document itself. All browsers in current use support all three approaches. Note: Onload events are fired on iframe elements before they are fired on the containing document. See iframe onload in use in Access to Iframe and Contents.
https://aakashgoel.com/capturing-the-load-event-of-an-iframe-a-case-study-1a3761c871fe
Jul 23, 2016 · With around 98% Global browser support, postmessage allows for messages to be exchanged between 2 windows (the child iFrame window and the parent window) Fire a message from the iFrame’s Javascript as soon as it’s ready for consumption and make the parent window gracefully reveal the iFrame.
https://humanwhocodes.com/blog/2009/09/15/iframes-onload-and-documentdomain/
Sep 15, 2009 · This works in all browsers except Internet Explorer (even version 8!). I had hoped that perhaps using the attachEvent() method would work, but alas, Internet Explorer just doesn’t support the load event on an iframe element. Pretty disappointing. Using the iframe window’s onload
https://www.w3schools.com/jsref/event_onload.asp
The onload event can be used to check the visitor's browser type and browser version, and load the proper version of the web page based on the information. The onload event can also be used to deal with cookies (see "More Examples" below).
Nov 04, 2019 · "Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers. The site was built and is maintained by Alexis Deveria, with occasional updates provided by the web development community. The design used as of 2014 was largely created by Lennart Schoors. FAQ
https://www.w3schools.com/jsref/event_onunload.asp
The onunload event occurs once a page has unloaded (or the browser window has been closed). onunload occurs when the user navigates away from the page (by clicking on a link, submitting a form, closing the browser window, etc.). Note: The onunload event is also triggered when a user reloads the page (and the onload event).
https://developer.mozilla.org/en-US/docs/Web/API/Window/load_event
The load event is fired when the whole page has loaded, including all dependent resources such as stylesheets and images. This is in contrast to DOMContentLoaded, which is fired as soon as the page DOM has been loaded, without waiting for resources to finish loading.
https://forums.tumult.com/t/detect-iframe-loaded/7588
Aug 22, 2016 · onload-event can be used for iFrames, too … not shure if it’s 100% relyable. take a googlesearch iFame onload javascript classic12 (Steve Warby) August 15, 2016, 2:57pm #3
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