How to capture null in javascript

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$(null) is an empty jQuery object, not null. And all objects are truthy.

If you want to test null, use this === null. You don’t need jQuery for this.

However, I don’t see why do you expect this to be null sometimes. Instead, it seems you want to ignore whitespace text nodes.

var $elements = $('.webgrid-footer td').contents().filter(function() {
  return (this.nodeType === 3 && $.trim(this.nodeValue) !== '')
         || this.nodeType === 1;
});

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