jQuery - Check if DOM element already exists

Question

I am trying to add some form elements dynamically via Ajax with jQuery. I want to make sure that I don\'t create the same element twice, so I only want to add it if it hasn\

Answer 1

In this case, you may want to check if element exists in current DOM

if you want to check if element exist in DOM tree (is attached to DOM), you can use:

var data = $('#data_1'); 
if(jQuery.contains(document.documentElement, data[0])){
    // #data_1 element attached to DOM
} else {
    // is not attached to DOM
}