Validate GridView textbox in clientside using javascript

 Find Gridview TextBox in client side using javascript  
 Here this article show show how we can find gridview textbox which is inside Template Field and validate the entry while
editing the record.  
 function ValidateGridEditMode()  
 {  
      var n = document.getElementById('ctl00_ContentPlaceHolder1_tbcLocation_tpnlCountry_gvEmp').rows.length;  
      var i;  
      for(i=2; i <=n; i++)  
      {   
           if(i<10)  
           {  
                txtEmpName=document.getElementById('ctl00_ContentPlaceHolder1_tbcLocation_tpnlCountry_gvEmp_ctl0'+i+'_txtEmpName');   
           }  
           else  
           {  
                txtEmpName=document.getElementById('ctl00_ContentPlaceHolder1_tbcLocation_tpnlCountry_gvEmp_ctl'+i+'_txtEmpName');   
           }  
           if(txtEmpName !=null)  
           {  
                if(txtEmpName.value == "")  
                {  
                     alert("Enter Emp Name...!");   
                     txtEmpName.focus();   
                     return false;  
                }   
           }   
      }  
      return true;  
 }