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How do you check that a number is NaN in JavaScript?
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Use this code:
isNaN('geoff');
See isNaN() docs on MDN.
alert ( isNaN('abcd')); // alerts true
alert ( isNaN('2.0')); // alerts false
alert ( isNaN(2.0)); // alerts false
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Is it possible to override JavaScript's toString() function to provide meaningful output for debuggi
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While it is true the alert function will display the return value of the function overriding the prototype toString property, Object.prototype.toString.call(f) will still display [object Object].
– Frederik Krautwald
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Escape quotes in JavaScript
...re causing the onclick HTML attribute to close prematurely.
Using the JavaScript escape character, \, isn't sufficient in the HTML context. You need to replace the double-quote with the proper XML entity representation, ".
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iFrame src change event detection?
...in the following example:
<iframe src="http://www.google.com/" onLoad="alert('Test');"></iframe>
The alert will pop-up whenever the location within the iframe changes. It works in all modern browsers, but may not work in some very older browsers like IE5 and early Opera. (Source)
If ...
In Javascript/jQuery what does (e) mean?
I am new to JavaScript/jQuery and I've been learning how to make functions. A lot of functions have cropped up with (e) in brackets. Let me show you what I mean:
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Parse an HTML string with JS
...DOMParser once and then reuse that same object throughout the rest of your script.
– Jack Giffin
May 19 '18 at 17:36
1
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Can I escape html special chars in javascript?
I want to display a text to HTML by a javascript function. How can I escape html special chars in JS? Is there an API ?
15 ...
Avoid browser popup blockers
I'm developing an OAuth authentication flow purely in JavaScript and I want to show the user the "grant access" window in a popup, but it gets blocked.
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How to detect escape key press with pure JS or jQuery?
...ect escape key press in IE, Firefox and Chrome?
Below code works in IE and alerts 27 , but in Firefox it alerts 0
8 Answe...
How do you create a hidden div that doesn't create a line break or horizontal space?
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Show / hide by mouse click:
<script language="javascript">
function toggle() {
var ele = document.getElementById("toggleText");
var text = document.getElementById("displayText");
if (ele.style.display == "block") {
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