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Most efficient way to concatenate strings in JavaScript?
In JavaScript, I have a loop that has many iterations, and in each iteration, I am creating a huge string with many += operators. Is there a more efficient way to create a string? I was thinking about creating a dynamic array where I keep adding strings to it and then do a join. Can anyone explain...
jQuery.parseJSON throws “Invalid JSON” error due to escaped single quote in JSON
...es within strings. However, during his discussion of JSON in Appendix E of JavaScript: The Good Parts, he writes:
JSON's design goals were to be minimal, portable, textual, and a subset of JavaScript. The less we need to agree on in order to interoperate, the more easily we can interoperate.
S...
Getting a better understanding of callback functions in JavaScript
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Here is a basic example that explains the callback() function in JavaScript:
var x = 0;
function testCallBack(param1, param2, callback) {
alert('param1= ' + param1 + ', param2= ' + param2 + ' X=' + x);
if (callback && typeof(callback) === "function") {
x += 1;
...
Delaying a jquery script until everything else has loaded
... I need to run only once everything else on the page, including some other javascripts (over which I have no control) have finished doing their thing.
...
JavaScript loop through json array?
...ay comprehension makes for in less bad
Array comprehension introduced with javascript 1.7 in firefox 2 (yes 2)
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What is the best JavaScript code to create an img element
... loading. You can end up with the image in an unexpected place, or a weird JavaScript error on IE. If you need to be able to add it at load-time (but after the <body> element has started), you could try inserting it at the start of the body using body.insertBefore(body.firstChild).
To do this...
android webview geolocation
...to retrieve a user's location in a WebView . I do this with the following Javascript:
6 Answers
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Function in JavaScript that can be called only once
... @EgyCode - In certain contexts (like in an if statement test expression), JavaScript expects one of the values true or false and the program flow reacts according to the value found when the expression is evaluated. Conditional operators like == always evaluate to a boolean value. A variable can al...
Why does (“foo” === new String(“foo”)) evaluate to false in JavaScript?
...n you try to access a property of a primitive (using it as an object), the Javascript language will box it to an object, creating a new object every time. This is described in the specification.
This is why you cannot put properties on primitives:
var x = "a";
x.property = 2;
alert(x.property) //...
Javascript Regex: How to put a variable inside a regular expression?
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To build a regular expression from a variable in JavaScript, you'll need to use the RegExp constructor with a string parameter.
function reg(input) {
var flags;
//could be any combination of 'g', 'i', and 'm'
flags = 'g';
return new RegExp('ReGeX' + input +...