How can I run a JavaScript callback when an image is loaded?

.complete + callback This is a standards compliant method without extra dependencies, and waits no longer than necessary: var img = document.querySelector(‘img’) function loaded() { alert(‘loaded’) } if (img.complete) { loaded() } else { img.addEventListener(‘load’, loaded) img.addEventListener(‘error’, function() { alert(‘error’) }) } Source: http://www.html5rocks.com/en/tutorials/es6/promises/

Get image dimensions with Javascript before image has fully loaded

You are right that one can get image dimensions before it’s fully loaded. Here’s a solution (demo): var img = document.createElement(‘img’); img.src=”https://stackoverflow.com/questions/6575159/some-image.jpg”; var poll = setInterval(function () { if (img.naturalWidth) { clearInterval(poll); console.log(img.naturalWidth, img.naturalHeight); } }, 10); img.onload = function () { console.log(‘Fully loaded’); }

Dynamic loading of images in WPF

It is because the Creation was delayed. If you want the picture to be loaded immediately, you can simply add this code into the init phase. src.CacheOption = BitmapCacheOption.OnLoad; like this: src.BeginInit(); src.UriSource = new Uri(“picture.jpg”, UriKind.Relative); src.CacheOption = BitmapCacheOption.OnLoad; src.EndInit();

“_Problem Loading Widget” message

Check elements you used in the view in a Widget.. Documentation link A RemoteViews object (and, consequently, an App Widget) can support the following layout classes: FrameLayout LinearLayout RelativeLayout GridLayout And the following widget classes: AnalogClock Button Chronometer ImageButton ImageView ProgressBar TextView ViewFlipper ListView GridView StackView AdapterViewFlipper Using forbidden elements causes this very Problem Loading … Read more

Display a ‘loading’ message while a time consuming function is executed in Flask

Add this to your index.html or js file (I’m assuming you have jQuery here, you could use standard javascript of course.): <script type=”text/javascript”>// <![CDATA[ function loading(){ $(“#loading”).show(); $(“#content”).hide(); } // ]]></script> Add this to you html or css file: div#loading { width: 35px; height: 35px; display: none; background: url(/static/loadingimage.gif) no-repeat; cursor: wait; } You can … Read more

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