Jquery only prepend if object dosen't exist
4521
Is there an "exists" function for jQuery?
134996
How can I temporarily disable the "return value might be undefined" warning?
74109
How to verify in Javascript Object Model if a List Exists
121066
How to check if list item already exist when adding it with
155510
Check if object is a jQuery object
36223
why $.isEmptyObject($('#id-does-not-exist-on-page')) returns false?
40229
How do I check if a variable exists?
101850
How to add class to a jQuery element if a condition is true and remove the same class if the condition is false?
106479
Check if a row exists, otherwise insert
67433
Insert data only if record does not exist
115423
How to check null objects in jQuery
34540
How to add empty object not using bpy.ops?
135626
Prepend text to beginning of string
54246
Need help with: jquery prepend doctype to html
27332
JSON control if @currentfield is empty
36953
What is the best way to add options to a select from a JavaScript object with jQuery?
70566
How do I check if an object has a key in JavaScript?