Question

How to check if an element exist , and if it does i want the insertAfter to be not valid.And if the element isn’t exist, then i want the insertAfter to be valib but only once.My goal is to send only once insertAfter if an element isn’t existing and if it does not send anything

Answer 1

Just do a length check. Assuming you have a selector #sel, and you want to insert something after it.

var foo = 'something';
if ($('#sel').length) {
   //do something if elem is present
} else {
    $('#sel').insertAfter(foo);
}