Top "Undefined" questions

A variable is undefined if it has not been assigned a value.

Javascript - removing undefined fields from an object

Is there a clean way to remove undefined fields from an object? i.e. > var obj = { a: 1, b: undefined, …

javascript object field undefined
jQuery / Javascript code check, if not undefined

Is this code good? var wlocation = $(this).closest('.myclass').find('li a').attr('href'); if (wlocation.prop !== undefined) { window.…

javascript jquery undefined
Check if variable exist in laravel's blade directive

I'm trying to create blade directive which echo variable (if variable defined) or echo "no data" if variable undefined. This …

php laravel undefined laravel-5.2 directive
Should JSON include null values

I'm creating an API that returns results as JSON. Is there a current best practice for whether we should include …

javascript json null undefined
variable === undefined vs. typeof variable === "undefined"

The jQuery Core Style Guidelines suggest two different ways to check whether a variable is defined. Global Variables: typeof variable === "…

javascript jquery undefined
onChange function is not defined

This has got to be something simple. I searched the internet and only found syntax errors as the cause of …

javascript jquery undefined onchange
JSLint: was used before it was defined

Hi I have the 3 javascript files. jquery.js utility.js file1.js In file1.js I have jQuery.noConflict() jQuery(…

javascript undefined jslint
Fatal error: Call to undefined function get_header() in index.php on line 1

I have the same issue. I am totally new in PHP. I installed XAMPP and downloaded the hatch theme from …

undefined fatal-error
Is it better to return `undefined` or `null` from a javascript function?

I have a function which I have written which basically looks like this: function getNextCard(searchTerms) { // Setup Some Variables // Do …

javascript function null return undefined
Notice: Undefined index: HTTP_REFERER

Notice: Undefined index: HTTP_REFERER $http_referer = $_SERVER['HTTP_REFERER'] i used this from tutorial.and it looks okay also …

php indexing undefined http-referer