query: How can I check if append element already exists?
positive_passages.docid: 4521
positive_passages.text: Is there an "exists" function for jQuery?
negative_passages.docid: 134025
negative_passages.text: How to check if an array value exists?
negative_passages.docid: 112077
negative_passages.text: How to check if a value already exists to avoid duplicates?
negative_passages.docid: 18575
negative_passages.text: How to 'insert if not exists' in MySQL?
negative_passages.docid: 113905
negative_passages.text: How can I check whether a variable is defined in JavaScript?
negative_passages.docid: 39945
negative_passages.text: Is it possible to save a reference to a not yet existing elment in JavaScript?
negative_passages.docid: 85970
negative_passages.text: Test if element is present using Selenium WebDriver?
negative_passages.docid: 54409
negative_passages.text: How to only append to clipboard (but not overwrite current data)?
negative_passages.docid: 22042
negative_passages.text: How can I check whether a radio button is selected with JavaScript?
negative_passages.docid: 15235
negative_passages.text: Check if a given key already exists in a dictionary
negative_passages.docid: 83782
negative_passages.text: How to check a not-defined variable in JavaScript
negative_passages.docid: 91447
negative_passages.text: Check if a method exists
negative_passages.docid: 148755
negative_passages.text: How to check if string contents have any HTML in it?
negative_passages.docid: 80608
negative_passages.text: JavaScript check if variable exists (is defined/initialized)
negative_passages.docid: 41388
negative_passages.text: Can I insert elements to the beginning of an element using .appendChild()?
negative_passages.docid: 40389
negative_passages.text: Check if an element contains a specific child element
negative_passages.docid: 101769
negative_passages.text: Detecting which list element was clicked using jquery (list is added dynamically)