is there any online aptitude test for salesforce?
am completly new to salesforce plese help.

is there any online aptitude test for salesforce?
am completly new to salesforce plese help.

Am trying to use javascript in a very simple VF page but it is not working can anybody please help me to find out the error.
<----------------PAGE---------------->
<apex:page controller="Example2">

 <script type="text/javascript">
 
    function validate()
    {
        if(document.getElementById('{!$Component.frm.pb.pbs.pbsi1.aa}').value == '')
        {
            alert("FIRST NAME is mandatory");
        }
        if(document.getElementById('{!$Component.frm.pb.pbs.bb}').value == '')
        {
            alert("LAST NAME is mandatory");
        }
         else
        {
            callmove();
            alert("NAME has been inserted CONCATINATED");
        }
    }
        
  </script>  
  <apex:form id="frm"> 
  <apex:actionFunction action="{!move}" name="move" reRender="pb"/>  
   <apex:pageBlock id="pb">   
    <apex:pageBlockSection id="pbs">
               <apex:pageBlockSectionItem ><apex:outputLabel value="FIRST NAME"/></apex:pageBlockSectionItem>
            <apex:pageBlockSectionItem id="pbsi1"><apex:inputText value="{!aa}" id="aa"/></apex:pageBlockSectionItem>
              <apex:pageBlockSectionItem ><apex:outputLabel value="LAST NAME"/></apex:pageBlockSectionItem> 
            <apex:pageBlockSectionItem id="pbsi2"><apex:inputText value="{!bb}" id="bb"/></apex:pageBlockSectionItem>
       <apex:pageBlockSectionItem ><apex:outputLabel value="FULL NAME"/></apex:pageBlockSectionItem> 
            <apex:pageBlockSectionItem id="pbsi3"><apex:inputText value="{!cc}" id="cc"/></apex:pageBlockSectionItem>        
    </apex:pageBlockSection>    
      <apex:pageBlockButtons location="bottom" >      
    <apex:commandButton value="CONCAT" action="{!move}" onclick="move();"/>
        </apex:pageBlockButtons>  
   </apex:pageBlock>
     </apex:form>
 </apex:page>

<----------------CLASS---------------->
public class Example2 {

    public PageReference move() {
    cc=aa+bb;
        return null;
    }

public string aa{get;set;}
public string bb{get;set;}
public string cc{get;set;}
 
public pagereference getMove() {
cc=aa+bb;
return null;
        
    }

}