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How to check a not-defined variable in JavaScript
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In JavaScript, null is an object. There's another value for things that don't exist, undefined. The DOM returns null for almost all cases where it fails to find some structure in the document, but in JavaScript itself undefined ...
Preventing form resubmission
... GET after the POST (POST redirect GET pattern)
disabling the button using javascript
Nothing you do under 2. will totally prevent duplicate submits. People can click very fast and hackers can post anyway. You always need 1. if you want to be absolutely sure there are no duplicates.
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How to select last two characters of a string
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slice() reference : developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Offirmo
Oct 30 '13 at 9:20
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jquery's append not working with svg element?
...g id="s" xmlns="http://www.w3.org/2000/svg"/>
<script type="text/javascript">
function makeSVG(tag, attrs) {
var el= document.createElementNS('http://www.w3.org/2000/svg', tag);
for (var k in attrs)
el.setAttribute(k, attrs[k]);
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Custom events in jQuery?
... up events from the dom elements like 'click' etc, but I'm building a tiny javascript library/plugin to handle some preview functionality.
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Detect IE version (prior to v9) in JavaScript
... CSS to make style exceptions, or, if you require, you can add some simple JavaScript:
(function ($) {
"use strict";
// Detecting IE
var oldIE;
if ($('html').is('.lt-ie7, .lt-ie8, .lt-ie9')) {
oldIE = true;
}
if (oldIE) {
// Here's your JS for IE..
} el...
Do htmlspecialchars and mysql_real_escape_string keep my PHP code safe from injection?
...eed < or > to do anything dangerous. Our attack vector could just be javascript:alert(document.cookie)
Now resultant HTML looks like
<img src= "javascript:alert(document.cookie)" />
The attack gets straight through.
It gets worse. Why? because htmlspecialchars (when called this way...
How to get the file name from a full path using JavaScript?
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The following line of JavaScript code will give you the file name.
var z = location.pathname.substring(location.pathname.lastIndexOf('/')+1);
alert(z);
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How to add onload event to a div element
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<div id="somid">Some content</div>
<script type="text/javascript">
oQuickReply.swap('somid');
</script>
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or - even better - just in front of </body>:
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<script type="text/javascript">
oQuickReply.swap('somid');
</script>
</body>
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JavaScript - Get minutes between two dates
If I have two dates, how can I use JavaScript to get the difference between the two dates in minutes?
10 Answers
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