query: Know if a DOM object is dead
positive_passages.docid: 25719
positive_passages.text: How can I avoid state of "TypeError: can't access dead object" in my Firefox add-on?
negative_passages.docid: 145303
negative_passages.text: Equivalent of !$A.util.isEmpty() in LWC
negative_passages.docid: 126638
negative_passages.text: How can I determine if a jQuery object is deferred?
negative_passages.docid: 153698
negative_passages.text: Is there an easy way to tell if a class/struct has no data members?
negative_passages.docid: 49446
negative_passages.text: How to check for an undefined or null variable in JavaScript?
negative_passages.docid: 147070
negative_passages.text: Monitor All JavaScript Object Properties (magic getters and setters)
negative_passages.docid: 21810
negative_passages.text: How to identify items without getting killed
negative_passages.docid: 576
negative_passages.text: How can I check for an empty/undefined/null string in JavaScript?
negative_passages.docid: 27606
negative_passages.text: Detecting an undefined object property
negative_passages.docid: 9010
negative_passages.text: Can plain Javascript objects have events?
negative_passages.docid: 157013
negative_passages.text: How to check if a page is ghosted
negative_passages.docid: 91315
negative_passages.text: How can I make console.log show the current state of an object?
negative_passages.docid: 120258
negative_passages.text: Check if element is visible in DOM
negative_passages.docid: 64695
negative_passages.text: onDestroy() - to set or not to set instance variables to null?
negative_passages.docid: 83782
negative_passages.text: How to check a not-defined variable in JavaScript
negative_passages.docid: 26495
negative_passages.text: Check if active object has a modifier
negative_passages.docid: 115423
negative_passages.text: How to check null objects in jQuery