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Response.Redirect with POST instead of Get?
...edirect the POST request from domain A to domain B without any warnings or confirmation dialogs! Safari also acts in an interesting manner, while it does not raise a confirmation dialog and performs the redirect, it throws away the POST data, effectively changing 307 redirect into the more common 30...
JS - get image width and height from the base64 code
...
var i = new Image();
i.onload = function(){
alert( i.width+", "+i.height );
};
i.src = imageData;
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Parsing JSON from XmlHttpRequest.responseJSON
...LHttpRequest();
req.responseType = 'json';
req.open('GET', url, true);
req.onload = function() {
var jsonResponse = req.response;
// do something with jsonResponse
};
req.send(null);
Compatibility: responseType = 'json' is not supported by IE11.
The classic way
The standard XMLHttpRequest...
Why is document.body null in my javascript?
... section that uses body. Not cool.
You want to wrap this code in a window.onload handler or place it after the <body> tag (as mentioned by e-bacho 2.0).
<head>
<title>Javascript Tests</title>
<script type="text/javascript">
window.onload = function() {
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Convert SVG to image (JPEG, PNG, etc.) in the browser
...g+xml;charset=utf-8"});
var url = DOMURL.createObjectURL(svgBlob);
img.onload = function () {
ctx.drawImage(img, 0, 0);
DOMURL.revokeObjectURL(url);
if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob)
{
var blob = canvas.msToBlob();
...
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...
window.onload vs document.onload
Which is more widely supported: window.onload or document.onload ?
9 Answers
9
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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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Warn user before leaving web page with unsaved changes
...ll string:
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = 'It looks like you have been editing something. '
+ 'If you leave before saving, your changes will be lost.';
(e || window.event).returnValue = confirmationMessage; //Gec...
How to add image to canvas
... base_image = new Image();
base_image.src = 'img/base.png';
base_image.onload = function(){
context.drawImage(base_image, 0, 0);
}
}
I.e. draw the image in the onload callback of the image.
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