Dependent drop down list using Struts 1.2 with Ajax DWR

[selvaraju sellamuthu]

I am using Ajax DWR to display second list in struts 1.2. Through action, i got list for first box. Using this list, i tried to get dynamic list for second box using ajax dwr. I can print the second list values in helper class. when i tried to get list using html options tag attributes, i got error stating listTableColumns is not under the bean. Below is my code. Please suggest. i used the same code in Struts 2 project, it worked well.

My Java Script Code

  
<script type="text/javascript">
 			function onChangeTableName(value) {
 			   var tableName=value;
 			   AjaxHelper.getColumnsByTable(tableName,populateTableColumns);
       	 	}  
          
 			function populateTableColumns(data) {
       			DWRUtil.removeAllOptions("listTableColumns");
       			DWRUtil.addOptions("listTableColumns",data);
       		}

		</script>

Ajax Helper Class

    
public class AjaxHelper {
	
	
	
    private List listTableColumns=new ArrayList();
     
    public AjaxHelper() {
     }
    
 public List getColumnsByTable(String value) {
    	
		if ((value != null) && (!value.equals(""))){   
    		System.out.println("dwr-getColumnsByTable-value:"+value);    		
    		DSEService dseService=new DSEService();
    		listTableColumns=dseService.getColumnList(value);
    		System.out.println("dwr-getColumnList-listTableColumns-size:"+listTableColumns.size());
		}      
        return listTableColumns;     
    
}
  
}

My Jsp

  
<tr >
				<td>DB Table Name:</td>
				<td>
				<html:select property="tableName" onchange="onChangeTableName(this.value);" >
				<html:option value="select">-Select Here-</html:option>
				<html:optionsCollection name="dbTable" />
				</html:select> 
				</td>
			    	</tr> 
	
	<tr >
				<td>DB Table Name:</td>
				<td>
				<html:select property="tableFieldName">
				<html:option value="select">-Please Select the above list-</html:option>
				[color=red]<html:options property="listTableColumns" />[/color]	
 			               </html:select> 
				</td>
			    	</tr>