Following is what i´ m trying to accomplish:


and on change picklist:


Switching between picklist values should update the Person in the chart: I got this working with following code:

VF Component:

<apex:component Controller="ForecastHierarchyController">
    <apex:includeScript value="https://www.google.com/jsapi"/>
    <script>
        google.load('visualization', '1', {packages:['orgchart']}); 
        google.setOnLoadCallback(drawChart);

        function drawChart() {
            var data = new google.visualization.DataTable();
            data.addColumn('string', 'Name');
            data.addColumn('string', 'Parents');
            data.addColumn('string', 'Type');
            data.addRows([
                // All data rows are calculated in Apex controller
                // and returned as a string with line endings CR+LF
                {!accRows}
            ]);
			
            var chart = new google.visualization.OrgChart(document.getElementById('chart_div'));
			

                
            chart.draw(data, {allowHtml:true,
                              size:'medium',
                              allowCollapse:true});
                       
        }
    </script>
    
    
     <apex:form >
        <apex:selectList value="{!FilterType}" multiselect="false" size="1">
              <apex:selectOption itemLabel="PersonOne" itemvalue="PersonOne"/>
               <apex:selectOption itemLabel="PersonTwo" itemvalue="PersonTwo"/>
               <apex:actionSupport event="onchange" action="{!CreateChartData}" onsubmit="drawChart();"/>
        </apex:selectList>
	 </apex:form>  

	 <apex:outputPanel id="chart">
	    <div id='chart_div'>
		</div>
     </apex:outputPanel>
</apex:component>

Controller:

public class ForecastHierarchyController { 
	private account acc;
	public String FilterType {get;set;}
	public String accRows {get;set;}
	
    public ForecastHierarchyController() {
    	FilterType='PersonOne';
    	CreateChartData();
    } 
    
    public void CreateChartData(){   	
        system.debug('####FilterType'+FilterType);    	
     	accRows= '';
     	if (FilterType=='PersonOne'){
	        accRows+=            '[{v:\''    + 'PersonOne'+ 
		                         '\', f:\''  + 'PersonOne' + 
		                         '\'},\''    + '' +
		                         '\',\''     + '' + 
		                         '\'],\r\n';	
     	}
     	else{
	        accRows+=            '[{v:\''    + 'PersonTwo'+ 
		                         '\', f:\''  + 'PersonTwo' + 
		                         '\'},\''    + '' +
		                         '\',\''     + '' + 
		                         '\'],\r\n';	     	    
     	}   		
     
     	accRows+= '[\'\',\'\',\'\']';
     	system.debug('accRows'+accRows);
    }


}

There is only one problem: on change picklist value all the page is refreshed (picklist+ chart). Instead,on change person, i would like to refresh only the chart and not the whole page.

I´ ve tried adding rerender attribute to actionSupport tag:

<apex:actionSupport event="onchange" action="{!CreateChartData}" onsubmit="drawChart();" rerender="chart" />

but it doesn´t work,on change picklist value chart isn´t showed anymore.

Do you know how can i refresh only the chart and not the whole page?

Thanks in advance for any advice.