Check if element exists [duplicate]

Answer 1

How about:

if (tr.size() == 0) 

Answer 2

I always add this little jQuery snippet at the beginning of my JS files

jQuery.fn.exists = function(){return jQuery(this).length>0;}

This uses the same approach many here have suggested, but it also allows you to access whether or not an object exists like this:

if ( $('#toolbar').exists() ){
    $('#toolbar').load(..., function(){...});
    //etc...
}

Answer 3

Check its length property:

if(tr.length) {
    // exists
}

if(tr) always evaluates to true because a jQuery object, or any JavaScript Object for that matter, is always truthy.

Answer 4

That's because tr is a jQuery object, which is truthy (even when the jQuery object is empty). Use if (tr.length) instead, which will be true when length is not zero, false when it is zero. Or alternately, if (tr[0]).

Answer 5

try this

var tr = $('#parts-table .no-data').parent().length;