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

In order to check if an element exists, you need to find a selector that matches only that element and check if the length of the jQuery object is equal to 0 or not, like so:

if ($('#unique-selector').length === 0) {
    // code to run if it isn't there
}
else {
    // code to run if it is there
}