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C#: Raising an inherited event
...Loading;
public event EventHandler Finished;
protected virtual void OnLoading(EventArgs e)
{
EventHandler handler = Loading;
if( handler != null )
{
handler(this, e);
}
}
protected virtual void OnFinished(EventArgs e)
{
EventHandler h...
Can scripts be inserted with innerHTML?
...cript-it-too
So use this instead of script tags:
<img src="empty.gif" onload="alert('test');this.parentNode.removeChild(this);" />
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addEventListener vs onclick
...avaScript programmers thinks that the event name is for example onclick or onload. on is not a part of event name. Correct event names are click and load, and that's how event names are passed to .addEventListener().
Works in almost all browser. If you still have to support IE <= 8, you can use a...
The simplest possible JavaScript countdown timer? [closed]
...0) {
timer = duration;
}
}, 1000);
}
window.onload = function () {
var fiveMinutes = 60 * 5,
display = document.querySelector('#time');
startTimer(fiveMinutes, display);
};
<body>
<div>Registration closes in <span id="time">0...
Why is document.write considered a “bad practice”?
...cripts small
They don't have to worry about overriding already established onload events or including the necessary abstraction to add onload events safely
It's extremely compatible
As long as you don't try to use it after the document has loaded, document.write is not inherently evil, in my humbl...
Detect Click into Iframe using JavaScript
... "\n";
console.value = text;
}
function attachOnloadEvent(func, obj) {
if(typeof window.addEventListener != 'undefined') {
window.addEventListener('load', func, false);
} else if (typeof document.addEventListener != 'undefined') {
...
Preview an image before it is uploaded
...p; input.files[0]) {
var reader = new FileReader();
reader.onload = function(e) {
$('#blah').attr('src', e.target.result);
}
reader.readAsDataURL(input.files[0]); // convert to base64 string
}
}
$("#imgInp").change(function() {
readURL(this);
});
&l...
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
... depends on the case. Let's try to trace some common behavior again:
img.onload may be called sometime in the future, when (and if) the image has successfully loaded.
setTimeout may be called sometime in the future, after the delay has expired and the timeout hasn't been canceled by clearTimeout. ...
Is it possible to ping a server from Javascript?
...ip = ip;
var _that = this;
this.img = new Image();
this.img.onload = function() {_that.good();};
this.img.onerror = function() {_that.good();};
this.start = new Date().getTime();
this.img.src = "http://" + ip;
this.timer = setTimeout(function() { _that.bad();}, 1500);...
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...