if condition for checking component exists in jquery code example

Example 1: jquery test div exists

$(document).ready(function() {
    var $myDiv = $('#DivID');

    if ( $myDiv.length){
        //you can now reuse  $myDiv here, without having to select it again.
    }


});

Example 2: check element exist in jquery

if ($('.element').length) {
  // there is at least one element matching the selector
}