About jQuery append() and how to check if an element has been appended

Question

I made a very simple button click event handler, I would like to have

element be appended when button clicked, you can check my code

Answer 1

http://jsfiddle.net/j36ye/17/

$("#search_btn").click(function(){
    if(($('#other').length) == 0) {
        $("#wrapper").append("
I am here
");
    }
    return false
});

Or

var other_appended = false;

$("#search_btn").click(function(){
    if(other_appended == false) {
         $("#wrapper").append("
I am here
");
          other_appended = true;
    }
    return false;
});