i got a code in which we get a dropdown of all objects available and also the drop down of the fields.. when we select an object from dropdown, it automatically generates list of fields of that particular object in dropdown.  but i need to create a page so that when we select an object from drop down, and we click a button like "add", the list of fields of that particular object should get displayed with checkboxes.. if we checkin some fields, the values of that fields should be displayed..

the code am having is...

can any one help to get out of this




<apex:page controller="objectController">
<apex:form > 
      <apex:pageBlock >
          <apex:pageBlockSection columns="2">

              <apex:pageBlockSectionItem >
                  <apex:outputlabel value="Object Names :"/> 
                      <apex:actionRegion >      
                           <apex:selectList value="{!selectedObject}" size="1">
                                    <apex:selectOptions value="{!ObjectNames}"/>
                                    <apex:actionSupport event="onchange" rerender="myFields"/>
                            </apex:selectList>
                     </apex:actionRegion>                         
              </apex:pageBlockSectionItem>

              <apex:pageBlockSectionItem >
                      <apex:outputlabel value="Field Names :"/>   
                      <apex:outputPanel id="myFields">   
                        <apex:actionRegion >  
                           <apex:selectList value="{!selectedField}" size="1">
                                <apex:selectOptions value="{!ObjectFields}"/>
                            </apex:selectList>
                        </apex:actionRegion>      
                     </apex:outputPanel>
              </apex:pageBlockSectionItem>

          </apex:pageBlockSection>
      </apex:pageBlock>
  </apex:form>
</apex:page>

*************************************************************************


public class objectController
{
    public Map <String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();

    public String selectedObject {get; set;}

    public String selectedField {get; set;}

    Public objectController()
    {   
        selectedObject = 'account';
    }

    public List<SelectOption> getObjectNames() 
    {
        List<SelectOption> objNames = new List<SelectOption>();
        List<String> entities = new List<String>(schemaMap.keySet());
        entities.sort();
        for(String name : entities)
        {
            objNames.add(new SelectOption(name,name));
        }
        return objNames;
     }

     public List<SelectOption> getObjectFields() 
     {
            Map<String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();
            Schema.SObjectType ObjectSchema = schemaMap.get(selectedObject);
            Map<String, Schema.SObjectField> fieldMap =
                ObjectSchema.getDescribe().fields.getMap();
            List<SelectOption> fieldNames = new List<SelectOption>();
            for (String fieldName: fieldMap.keySet()) 
            {  
                fieldNames.add(new SelectOption(fieldName,fieldName));
              //fieldMap.get(fieldName).getDescribe().getLabel();//It provides to get the object fields label.
            }
            return fieldNames;
      }       
}