Jquery selector null check

if(data && data != “”) alert(data); data will be null in your case, and null != “” , so the if is passing.

you can check your JavaScript OR jQuery object is empty or not, because we need to check many place our jQuery object is empty, null or undefined etc., So usually, we can check using $. isEmptyObject() as i explained as under.9 Oca 2016

isStringNullOrEmpty(val) || val. replace(/\s/g, “”) === ”; } , //If string is null or empty then return Null or else original value nullIfStringNullOrEmpty: function (val) { if (this. isStringNullOrEmpty(val)) { return null; } return val; } }, Utilize this helpers to achieve that.

isEmptyObject( object ) Returns: Boolean. Description: Check to see if an object is empty (contains no enumerable properties).