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Event listener for when element becomes visible?
...target').style.display;
if (previous_style != current_style) {
alert('style changed');
window.clearInterval(poll);
} else {
previous_style = current_style;
}
}, 100);
The DOM standard also specifies mutation events, but I've never had the chance to use them, and...
JavaScript: How to pass object by value?
...bj = Object.create( x );
obj.foo = 'foo';
obj.bar = 'bar';
})(o);
alert( o.foo ); // undefined
So any properties you add to obj will be not be added to o. Any properties added to obj with the same property name as a property in o will shadow the o property.
Of course, any properties adde...
Best way to detect that HTML5 is not supported
...
try {
document.createElement("canvas").getContext("2d");
alert("HTML5 Canvas is supported in your browser.");
} catch (e) {
alert("HTML5 Canvas is not supported in your browser.");
}
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...
Jquery - How to make $.post() use contentType=application/json?
...
I ended up adding the following method to jQuery in my script:
jQuery["postJSON"] = function( url, data, callback ) {
// shift arguments if data argument was omitted
if ( jQuery.isFunction( data ) ) {
callback = data;
data = undefined;
}
return j...
Chrome desktop notification example [closed]
...ddEventListener('DOMContentLoaded', function() {
if (!Notification) {
alert('Desktop notifications not available in your browser. Try Chromium.');
return;
}
if (Notification.permission !== 'granted')
Notification.requestPermission();
});
function notifyMe() {
if (Notificatio...
Set value of hidden field in a form using jQuery's “.val()” doesn't work
...". I've revised the example to include the code you pasted above, with an alert to confirm the value change: jsbin.com/elovo/2/edit
– Andy E
Jun 5 '10 at 10:18
...
Why does !{}[true] evaluate to true in JavaScript?
...ted as false:
http://jsfiddle.net/67GEu/
'use strict';
var b = {}[true];
alert(b); // undefined
b = !{}[true];
alert(b); // true
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Do I encode ampersands in ?
...ssibility of an ambiguity. This particular issue might not be introducing XSS attack vectors, bad rendering, or any affect at all 99.99% of the time, but that isn't a reason not to bother. Doing escaping correctly is hard and there's always the possibility of making mistakes.
...
Perform debounce in React.js
....
Without persist (default behavior: pooled event)
onClick = e => {
alert(`sync -> hasNativeEvent=${!!e.nativeEvent}`);
setTimeout(() => {
alert(`async -> hasNativeEvent=${!!e.nativeEvent}`);
}, 0);
};
The 2nd (async) will print hasNativeEvent=false because the event proper...
Refresh image with a new one at the same url
..., or need to be refreshed intermittently by the client without server-side script involvement, but where you still want the advantage of caching. For example, polling a live webcam that updates an image irregularly every few minutes. Alternatively, use instead of (1) or (2) if your server doesn't ...