JavaScript DropDownList in jqxgrid

Invoke the checkAll method of the jqxDropDownList. Author: http://jqwidgets.com

HTML

<link rel="stylesheet" href="http://jqwidgets.com/public/jqwidgets/styles/jqx.base.css">
<link rel="stylesheet" href="http://jqwidgets.com/public/jqwidgets/styles/jqx.energyblue.css">
<script src="http://jqwidgets.com/public/jqwidgets/jqx-all.js"></script>
<div class="col-lg-12" id="assignQuestionGrid"></div>

JavaScript

var data = [{
		   	question:'First question',
		   	ddSelect1:'valueB'
		   },{
		   	question:'Second question',
		   	ddSelect1:undefined
		   },{
		   	question:'Third question',
		   	ddSelect1:undefined
		   }];
		   var source = {
		   		datatype: "json",
		        localdata: data,
		        datafields: [{
		        	name: 'question',
				    type: 'string'
		        },{
		        	name: 'ddSelect1',
				    type: 'string'
		        }]
		    };
		    // source.dataBind();
		    // $scope.editAssignQueStionSection={};
			var adapter = new $.jqx.dataAdapter(source);
			$("#assignQuestionGrid").jqxGrid({
		        height: 400,
		        altRows: true,
		        width: '100%',
		        theme: 'bootstrap',
		        source: adapter,
		        autorowheight: true,
		        autoheight: true,
		        selectionmode: 'singlecell',
		        editable: true,
		        ready: function() {
		            console.log("grid is ready");
		        },
		        columns: [{
		        	text:"Question",
		        	datafield:'question',
		        	width: "30%",
		        	editable:false
		        },{
		        	text:"Select Users",
		        	datafield:'ddSelect1',
		        	width:'20%',
					columntype: 'dropdownlist',
					createeditor: function(row, cellvalue, editor, cellText, width, height) {
						var ddSource = [{
							label:"labelA",
							value:"valueA"
							
						},{
							label:"labelB",
							value:"valueB"
						},{
							label:"labelC",
							value:"valueC"
						}];
						console.log("ddSource ==>",ddSource);
						editor.jqxDropDownList({
				            dropDownHeight: '60px',
				            checkboxes: false,
				            filterable: true,
                    displayMember: 'label', 
										valueMember: 'value' ,
				            source: ddSource
				        });
					}

		        }]
		    });