jQuery append if doesn't exist

Question

I would like to append a div only if it\'s not already there. I am trying with this but it doesn\'t work:

$(\'#method_id\').on(\'change\', funct         


        

Answer 1

As you are appending div with id, you could just search if that div exists by calling :

if($("#warning_message").length > 0 ){
   $('.form-group').find('#column_message>.alert').remove();
}else{
   $('#column_message').append('
Warning! Installed column and method do not match
');
}

But if you would like to have more divs of alert, you could just search for class "alert" or so.

Another way without id ( probably better ) would be to use children() method