How to add option to select list in jQuery

My select list is called dropListBuilding. The following code does not seem to work:

 for (var i = 0; i < buildings.length; i++) {
     var val = buildings[i];
     var text = buildings[i];
     alert("value of builing at: " + i.toString() + " is: " + val);
     $("#dropListBuilding").addOption(val, text, false);
 }

This line dies:

$("#dropListBuilding").addOption(val, text, false);

What is the right to add items to the drop down in jQuery? I have tested without that line and the buildings variable does have my data element.

Don't make your code so complicated. It can be done simply as below by using a foreach-like iterator:

$.each(buildings, function (index, value) {
    $('#dropListBuilding').append($('<option/>', { 
        value: value,
        text : value 
    }));
});      

$('#dropListBuilding').append('<option>'+val+'</option>');

Doing it this way has always worked for me, I hope this helps.

var ddl = $("#dropListBuilding");	
for (k = 0; k < buildings.length; k++)
   ddl.append("<option value='" + buildings[k]+ "'>" + buildings[k] + "</option>");

Your code fails because you are executing a method (addOption) on the jQuery object (and this object does not support the method)

You can use the standard Javascript function like this:

$("#dropListBuilding")[0].options.add( new Option("My Text","My Value") )

$.each(data,function(index,itemData){
    $('#dropListBuilding').append($("<option></option>")
        .attr("value",key)
        .text(value)); 
});

It looks like you want this pluging as it follows your existing code, maybe the plug in js file got left out somewhere.

http://www.texotela.co.uk/code/jquery/select/

var myOptions = {
"Value 1" : "Text 1",
"Value 2" : "Text 2",
"Value 3" : "Text 3"
} 
$("#myselect2").addOption(myOptions, false); 
// use true if you want to select the added options » Run

This is working fine, try out this.

var ob = $("#myListBox");

for (var i = 0; i < buildings.length; i++) {
     var val = buildings[i];
     var text = buildings[i];
      
     ob.prepend("<option value="+ val +">" + text + "</option>");
}

If you do not want to rely on the 3.5 kB plugin for jQuery or do not want to construct the HTML string while escapping reserved HTML characters, here is a simple way that works:

function addOptionToSelectBox(selectBox, optionId, optionText, selectIt)
{
    var option = document.createElement("option");
    option.value = optionId;
    option.text = optionText;
    selectBox.options[selectBox.options.length] = option;
    if (selectIt) {
        option.selected = true;
    }
}

var selectBox = $('#veryImportantSelectBox')[0];
addOptionToSelectBox(selectBox, "ID1", "Option 1", true);

For me this one worked

success: function(data){
        	alert("SUCCCESS");
        	$.each(data,function(index,itemData){
        		console.log(JSON.stringify(itemData));
        		$("#fromDay").append( new Option(itemData.lookupLabel,itemData.id) )
        	});
        }