.prepend is not a function

Question

Please consider the following sample code:

Answer 1

The error appears because createElement() returns a DOMElement which does not have an append() method; that's only available on jQuery objects. You need to either wrap the DOMElement to a jQuery object or, better yet, create the element in jQuery:

$("#btn1").click(function(){
     var btn = $('');     
     btn.prepend("Prepended text. ");
     // add the btn to the DOM somewhere...
});