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

I have a json-object, which I print to the screen (using alert()-function): alert(object); Here is… Read more Javascript Says Json Object Property Is Undefined Although It's Not

I understand from MDN that 'undefined' is recognised as a primitive value, which is corrobo… Read more 'undefined' - If It's Defined As A Primitive Value, What Is It Defined In Terms Of Its Value At The Memory Level?

I am trying to test to see whether a Javascript variable is undefined. You will see that I am not e… Read more Javascript Array Value Is Undefined ... How Do I Test For That

I'm having a really weird problem with d3.js initilization. In the d3.js script, at the very b… Read more D3.js : Uncaught Typeerror: Cannot Read Property 'document' Of Undefined

Here I am trying to make a typing effect by pure Javascript Code. But it is giving me Wrong output.… Read more Why I Am Getting Wrong Output In Javascript?

How can you pass parameters into the keydown method from jquery because whenever I use a variable d… Read more Passing Parameters To Keydown