Regarding ajax functionin google charts

[kiran raj]

 google.charts.load('current', { 'packages': ['corechart'] });

        google.charts.setOnLoadCallback(drawChart());

        // Draw the chart and set the chart values

        function drawChart() {

            var data = google.visualization.arrayToDataTable([

            ['Task', 'Queue Count'],           

['Andaman', AndamanWaitCount],

['Andhra Pradesh', AndhraPradeshWaitCount],

['Arunachal Pradesh', ArunachalWaitCount],

['Assam', AssamWaitCount],

['Bihar', BiharWaitCount],

['Chhattisgarh', ChhattisgarhWaitCount],

['Delhi', DelhiWaitCount],

['DNDD', DNDDWaitCount],

['Goa', GoaWaitCount],

['Gujarat', GujaratWaitCount],

['Haryana', HaryanaWaitCount],

['Himachal', HimachalWaitCount],

['Jammu', JammuWaitCount],

['Jharkhand', JharkhandWaitCount],

['Karnataka', KarnatakaWaitCount],

['Kerala', KeralaWaitCount],

['Lakshadweep', LakshadweepWaitCount],

['Madhya Pradesh', MPWaitCount],

['Maharashtra', MaharashtraWaitCount],

['Manipur', ManipurWaitCount],

['Meghalaya', MeghalayaWaitCount],

['Mizoram', MizoramWaitCount],

['Nagaland', NagalandWaitCount],

['Orissa', OrissaWaitCount],

['Puducherry', PuducherryWaitCount],

['Punjab', PunjabWaitCount],

['Rajasthan', RajasthanWaitCount],

['Sikkim', SikkimWaitCount],

['Tamil Nadu', TNWaitCount],

['Telangana', TelanganaWaitCount],

['Tripura', TripuraWaitCount],

['Uttarakhand', UttarakhandWaitCount],

['Uttar Pradesh', UPWaitCount],

['West Bengal', WBWaitCount]

            ]);

            // Optional; add a title and set the width and height of the chart

            // var options = { 'title': '', 'width': 1200, 'height': 400 };

var options = { 'title': 'Location wise Wait Count', 'chartArea': { left: 50, top: 30, width: '100%' }, 'fontName': 'Verdana', 'fontSize': '12', 'legend': { position: "none" }, 'isStacked': true };

            // Display the chart inside the element with id="piechart"

            var chart = new google.visualization.ColumnChart(document.getElementById('columnchart'));

            chart.draw(data, options);

        }

in count i m getting values once after attaching those values to graph i m getting the graph properly but its flickering each time once the page is uploaded so i m not getting how to call ajax function in chart