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Check image width and height before upload with Javascript
...w Image();
var objectUrl = _URL.createObjectURL(file);
img.onload = function () {
alert(this.width + " " + this.height);
_URL.revokeObjectURL(objectUrl);
};
img.src = objectUrl;
}
});
Demo: http://jsfiddle.net/4N6D9/1/
I take it you real...
Javascript - How to detect if document has loaded (IE 7/Firefox 3)
...d, then I can attach an event listener. I can't add an eventlistener after onload has already fired since it won't get called. So how can I check if the document has loaded? I tried the code below but it doesn't entirely work. Any ideas?
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How to run a function when the page is loaded?
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window.onload = codeAddress; should work - here's a demo, and the full code:
<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<meta http-equiv="Content-Type" content="te...
Is there a cross-browser onload event when clicking the back button?
For all major browsers (except IE), the JavaScript onload event doesn’t fire when the page loads as a result of a back button operation — it only fires when the page is first loaded.
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JavaScript: Get image dimensions
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var img = new Image();
img.onload = function(){
var height = img.height;
var width = img.width;
// code here to use the dimensions
}
img.src = url;
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Using CSS for a fade-in effect on page load
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You can use the onload="" HTML attribute and use JavaScript to adjust the opacity style of your element.
Leave your CSS as you proposed. Edit your HTML code to:
<body onload="document.getElementById(test).style.opacity='1'">
<...
Get file size, image width and height before upload
... when the value of i is alerted in the callback function reader.onload it shows a random increment! e.g. for 4 files the value as alerted was 0 3 2 1 . Can any one explain that?
– freerunner
Mar 2 '14 at 11:16
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iFrame src change event detection?
...way that I can detect a src change in it via the parent page? Some sort of onload maybe?
7 Answers
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How to create a JavaScript callback for knowing when an image is loaded?
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Image.onload() will often work.
To use it, you'll need to be sure to bind the event handler before you set the src attribute.
Related Links:
Mozilla on Image.onload()
Example Usage:
window.onload = function () {
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image.onload event and browser cache
... an image is loaded, but if the image is saved in the browser cache, the .onload event will not be fired.
5 Answers
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