How to check if object is a DOM element?
132096
How do you check if a JavaScript Object is a DOM Object?
5254
How to determine an object's class?
30987
How to tell if a JavaScript function is defined
157279
How do you check if a variable is an array in JavaScript?
22042
How can I check whether a radio button is selected with JavaScript?
126196
How to check if an object is an array?
43713
How can I test if two jQuery wrapped DOM elements are the same?
37773
How do I detect whether a Python variable is a function?
132944
How to Check for a Specific Type of Object in PHP
117022
How to get class object's name as a string in Javascript?
85970
Test if element is present using Selenium WebDriver?
126638
How can I determine if a jQuery object is deferred?
148755
How to check if string contents have any HTML in it?
115423
How to check null objects in jQuery
63621
AJAX: Check if a string is JSON?
27983
How can I tell if a DOM element is visible in the current viewport?
88022
How to convert an "object" into a function in JavaScript?