JavaScript Sample

heroku report me a error: Call to undefined function imagecreatefromjpeg() ..at line 177, where at … Read more How Can I Fix Heroku Imagecreatefromjpeg()

I'm having a problem with Underscore.js templates and Internet Explorer. Here's part of the… Read more Checking For Undefined Variable With Underscore.js

I am working on a chrome extension that uses content scripts. I am attempting to get an element of … Read more Why Is Getelementsbytagname() Returning An Html Collection, But Getelementsbytagname()[0] Returning Undefined?

I've been searching or a solution to my problem, but none of the aswers I find are useful. I tr… Read more Jquery - $(document).getelementbyid('id').submit(function{}); Unedifined Not A Function

I'm not even certain what the title of this question should be - I'm not sure what is going… Read more Javascript Recursion Function Returning Undefined

When I am using any one of values(null, undefined, false, '', 0) in a if statement, it is a… Read more Javascript Falsy Values (null, Undefined, False, Empty String: "" Or '' And 0) And Comparison(==) Operator

Why is the value for undefined considered Finite in javascript while null is not? This is a very ba… Read more Why Is Isfinite(undefined) != Isfinite(null)?

[Bounty Edit] I'm looking for a good explanation when you should set/use null or undefined and … Read more When To Check For Undefined And When To Check For Null