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HTML Script tag: type or language (or omit both)?
...d.
When W3C was working on HTML5, they discovered all browsers have "text/javascript" as the default script type, so they standardized it to be the default value. Hence, you don't need type either.
For pages in XHTML 1.0 or HTML 4.01 omitting type is considered invalid. Try validating the followin...
How to scroll to top of page with JavaScript/jQuery?
Is there a way to control browser scrolling with JavaScript/jQuery?
27 Answers
27
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Javascript set img src
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Pure JavaScript to Create img tag and add attributes manually ,
var image = document.createElement("img");
var imageParent = document.getElementById("body");
image.id = "id";
image.className = "class";
image.src = searchPic.src; ...
What is the JavaScript >>> operator and how do you use it?
...s them to Numbers that can be expressed as 32-bit unsigned ints.
Although JavaScript's Numbers are double-precision floats(*), the bitwise operators (<<, >>, &, | and ~) are defined in terms of operations on 32-bit integers. Doing a bitwise operation converts the number to a 32-bit ...
Why can I use a function before it's defined in JavaScript?
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This article has some examples: JavaScript-Scoping-and-Hoisting
– Lombas
Nov 11 '15 at 12:26
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Why is setTimeout(fn, 0) sometimes useful?
...nasty bug, wherein the code was loading a <select> dynamically via JavaScript. This dynamically loaded <select> had a pre-selected value. In IE6, we already had code to fix the selected <option> , because sometimes the <select> 's selectedIndex value would be out of...
Should CSS always preceed Javascript?
...tless places online I have seen the recommendation to include CSS prior to JavaScript. The reasoning is generally, of this form :
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Best way to use Google's hosted jQuery, but fall back to my hosted library on Google fail
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Aren't javascript downloads blocking (synchronous) already? Seems to me the double-copy issue would therefore not be a problem.
– Matt Sherman
Jun 22 '09 at 2:08
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How does this JavaScript/jQuery syntax work: (function( window, undefined ) { })(window)?
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The window variable is made local for performance reasons. Because when JavaScript looks up a variable, it first goes through the local variables until it finds the variable name. When it's not found, JavaScript goes through the next scope etc. until it filters through the global variables. So if...
When should I use Inline vs. External Javascript?
...e? Because if the code is separate, it can easier be cached by browsers.)
JavaScript doesn't belong in the HTML code and if it contains special characters (such as <, >) it even creates problems.
Nowadays, web scalability has changed. Reducing the number of requests has become a valid consid...