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 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...
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)...
I have a site that loads CSS and fonts from Google Web Fonts.  However, one place where the site will be used is a local intranet with no Internet access.  I still want to use the fonts from Google where I can for the benefits that Google offers, suc...
I'm new to JavaScript and therefore confused for the variable scope... I'm trying to load an image, and replace it with another URL when it doesn't exist. I have to do it in pure JavaScript.  Here I got 2 versions extremely alike, but the...
Here is what I mean.  If the browser natively supports fetch api (for example, Chrome), then it uses the native browser Promise.  If I use another Promise library, (like bluebird, for example), native fetch still isn't using it — it uses native...
function loadNextComic() { window.scrollTo( 200, 480); img comic = new Image();     currentComicNumber++;     comic.src="Freqpg"+currentComicNumber+".jpg";     comic.onload = function()         {         document.getElementById("c...

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