The collection has not been initialized.

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Javascript

jQuery

I get this error, when trying to remove onclick so it wont create double element on every button click.

It works when clicking on the button many times but after a wild i get this error:

Line: 2
Error: The collection has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested.

here is my code

$(function () {$("#dialog").dialog({
           autoOpen: false

   });


       var node = document.createTextNode("Lediga tider att boka");
       var para = document.createElement("p");
       var selectList = document.createElement("select");

       var element = document.getElementById("textresultfree");
       while (element.hasChildNodes()) {
           element.removeChild(element.firstChild);
       }
       var myDiv = document.getElementById("myDivResult");
       while (myDiv.hasChildNodes()) {
           myDiv.removeChild(myDiv.firstChild);
       }
       para.appendChild(node);
       element.appendChild(para);
       myDiv.appendChild(selectList);


           $("#dialog").dialog("open");
           var free = "";
           for (var j = 0; j < bookedFreeTimes.length; j++) {

               free = bookedFreeTimes[j];
               var array = new Array(free);

               for (var k = 0; k < array.length; k++) {

                   var option = document.createElement("option");
                   option.text = array[k];
                   selectList.appendChild(option);

               }
           }

           }

       );
   }