I'm dynamically adding <script> tags to a page's <head>, and I'd like to be able to tell whether the loading failed in some way -- a 404, a script error in the loaded script, whatever.  In Firefox, this works:  var script_ta...
Is there a way to determine if a image path leads to an actual image, Ie, detect when an image fails to load in Javascript.  For a web app, I am parsing a xml file and dynamically creating HTML images from a list of image paths. Some image paths ma...
I'm familiar with the typical use of onload, as in the following:  <body onload="alert('Hello, World!');"> ... </body>   What are all the html elements that fire a load event? (thus executing javascript supplied in a...
I am trying to grab the maxresdefault of multiple YouTube thumbnails. Some YouTube videos simply don't have a high res thumbnail photo so I want to catch that with an onError prop on an img element. For some reason my function is not triggering w...
I want to use onerror to intercept and log all errors that occur in my JavaScript application. This works as expected except when using promises or async functions.  In the following snipped the exception thrown by fail is intercepted as expected but...
What sort of situations could cause this handler to be called? I'm not finding any instance where this method throws an error.  I tried with the device offline, I get xmlHttpRequest.status = 0 but no error.  Question is what sort of situations ca...
I have a function attached to window.onerror   window.onerror = function(errorMsg, url, line) {                 window.alert('asdf');                 };";   This works fine in firefox, chrome and IE, but it doesn't work in safari. Fro...
I'm writing an application in JavaScript that should create a new image. Sometimes it fails. I was able to detect the times when it does by attaching an image.onerror event listener. Question is: How may I learn what error occured - what paramete...
Javascript has this great callback window.onerror. It's quite convenient to track any error. However, it calls with the error name, the file name and the line. It's certainly not as rich as getting the actual error object from a try...catch s...
I implemented:   window.onerror = function (m, s, l, c, e) {  }   Where the e is the Error Object. For example, it contains:  ReferenceError: rde is not defined     at Object.bla.cs (domain.pt/bla.js:418:17)     at n.aanv (domain.pt/bla.js:125:29)...

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