How can I check if the input is empty in JavaScript?
576
How can I check for an empty/undefined/null string in JavaScript?
37350
checking each required input for empty value with jQuery
148755
How to check if string contents have any HTML in it?
23586
What is the difference between String.Empty and "" (empty string)?
5374
How to check if a macro value is empty or will not create text with plain TeX conditionals?
75153
How to check value is coming from json is null or not?
113018
Javascript shorthand if
89873
PHP: a short cut for isset and !empty?
12886
How can I convert a string to boolean in JavaScript?
87247
Using jQuery to test if an input has focus
96970
How do I empty an array in JavaScript?
148793
Checking Textbox Text for Null
140882
Proper way to detect empty/blank text
19818
How do you check if a selector matches something in jQuery?
125502
Empty set literal?
106570
Testing for an empty array object in JSON with jQuery
6988
How to check whether an array is empty using PHP?