How to check jQuery find return true or false? [duplicate]

You couldn’t use just find in if condition. You could use has or check for the length property.

var elm = $('.parent1');
if(elm.has('.child3')){
   var child3 = elm.find('.child3');
}

Or simply like this

var child3 = $('.parent1').find(".child3");
if(child3.length > 0) {
  // child3 is present
}