hiii all,
           
when i select the required object fom dropdown and click "add" button, i have to get the list of fields of that particular object with checkboxes. when i checkin some fields like phone, name and all then i need to get all the records of that object with the selected field values. i have a program regarding this.  and i want to improve my program so that if i checkin and click " view report" button, i have to get the records of that particular object with selected fields and the list of notes and attachments (if present) for all records of that selected object...


<apex:page controller="objectController">
<apex:form > 
      <apex:pageBlock >
          <apex:pageBlockSection title= "select the objects below">
<apex:pageBlockSectionItem >
                  <apex:outputlabel value = "Object Names :" /> 
                      <apex:actionRegion >      
                           <apex:selectList value="{!selectedObject}" size="1">
            <apex:selectOption itemValue="Account" itemLabel="Account" />
            <apex:selectOption itemValue="Contact" itemLabel="Contact"/>
            <apex:selectOption itemValue="Lead" itemLabel="Lead" />
            <apex:selectOption itemValue="report" itemLabel="report" />
            <apex:selectOption itemValue="campaign" itemLabel="campaign" />
            <apex:selectOption itemValue="merchandise" itemLabel="merchandise" />
            <apex:selectOption itemValue="invoice" itemLabel="invoice" />
            <apex:selectOption itemValue="case" itemLabel="case" />
            <apex:selectOption itemValue="solution" itemLabel="solutions" />
            <apex:selectOption itemValue="document" itemLabel="document" />
            <apex:selectOption itemValue="Opportunity" itemLabel="Opportunity"/>
            <apex:actionSupport event="onchange" rerender="myFields"/>
                            </apex:selectList>
                          <apex:commandbutton value="add"/>
                     </apex:actionRegion>                         
              </apex:pageBlockSectionItem>
               </apex:pageBlockSection>
          
<apex:pageBlockSection title ="these are the fields....">
              <apex:pageBlockSectionItem >
                      <apex:outputlabel value="Field Names :"/>   
                      <apex:outputPanel id="myFields">   
                        <apex:actionRegion >  
                           <apex:selectCheckboxes value="{!selectedField}">
    <apex:selectOptions value="{!ObjectFields}" />
    </apex:selectCheckboxes>
      <apex:commandbutton value="view report"/>     
                        </apex:actionRegion>      
                     </apex:outputPanel>
              </apex:pageBlockSectionItem>
          </apex:pageBlockSection>
             
      </apex:pageBlock>
  </apex:form>
</apex:page>

apex:
------------
public class objectController
{
    public Map <String, Schema.sObjectType> schemaMap = Schema.getGlobalDescribe();
    public String selectedObject {get; set;}
    public String selectedField {get; set;}
    
    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));
             
            }
            return fieldNames;
      }       
}