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Tainted canvases may not be exported
...;
function loadImage(src, callback) {
var img = new Image();
img.onload = callback;
img.setAttribute('crossorigin', 'anonymous'); // works for me
img.src = src;
return img;
}
And in your callback you can now use ctx.drawImage and export it using toDataURL
...
How to check file MIME type with javascript before upload?
...iles[i]; // See step 1 above
var fileReader = new FileReader();
fileReader.onloadend = function(e) {
var arr = (new Uint8Array(e.target.result)).subarray(0, 4);
var header = "";
for(var i = 0; i < arr.length; i++) {
header += arr[i].toString(16);
}
console.log(header);
// Check ...
How do I create a custom Error in JavaScript?
... = true
ex1.name = Error
ex1.message = NotImplementedError2 message
This confirmes the "problem" I ran into was the stack property of the error was the line number where new Error() was created, and not where the throw e occurred. However, that may be better that having the side effect of a NotIm...
How can I mock dependencies for unit testing in RequireJS?
...18n = stubs.i18n;
stubs.i18n = {
load: sinon.spy(function(name, req, onLoad) {
onLoad(i18n);
})
};
_.each(stubs, function(value, key) {
var stubName = 'stub' + key + cnt;
map[key] = stubName;
define(stubName, function() {
return value;
});
});
return...
How can I listen to the form submit event in javascript?
...t;input type="submit" name="submit">
</form>
JavaScript
window.onload = function() {
var form = document.querySelector("form");
form.onsubmit = submitted.bind(form);
}
function submitted(event) {
event.preventDefault();
}
...
How to make script execution wait until jquery is loaded
...
You can try onload event. It raised when all scripts has been loaded :
window.onload = function () {
//jquery ready for use here
}
But keep in mind, that you may override others scripts where window.onload using.
...
Detect when an image fails to load in Javascript
...st that.
function testImage(URL) {
var tester=new Image();
tester.onload=imageFound;
tester.onerror=imageNotFound;
tester.src=URL;
}
function imageFound() {
alert('That image is found and loaded');
}
function imageNotFound() {
alert('That image was not found.');
}
testIma...
Include jQuery in the JavaScript Console
... and use the following line for URL:
javascript:(function(e,s){e.src=s;e.onload=function(){jQuery.noConflict();console.log('jQuery injected')};document.head.appendChild(e);})(document.createElement('script'),'//code.jquery.com/jquery-latest.min.js')
Below is the formatted code:
javascript: (funct...
How to get image size (height & width) using JavaScript?
... check the dimensions using Javascript...
const img = new Image();
img.onload = function() {
alert(this.width + 'x' + this.height);
}
img.src = 'http://www.google.com/intl/en_ALL/images/logo.gif';
This can be useful if the image is not a part of the markup.
...
Disable IPython Exit Confirmation
...s really irritating that every time I type exit() , I get prompted with a confirmation to exit; of course I want to exit! Otherwise, I would not have written exit() !!!
...