Check and Get the focus on the input box through JavaScript on the UIWebView in iPhone.

  Document.body.focus();

  var  inID = document.activeElement.id;

   function Function1Delay()

      {

         if(document.activeElement .id  !=  inID)

          {

             inID = document.activeElement.id;

             alert('Start Scan');

             document.getElementById(inID).value='Dinesh Sharma';

             setTimeout("Func1Dealy()",200); 

          }

         else

          {

            setTimeout("Func1Delay()",500); 

          }

      }

1.

NSString *str12 = [NSString stringWithFormat:@"document.body.focus(); var inii=document.activeElement.id; function Func1Delay() {if(document.activeElement.id != inii){inii=document.activeElement.id; alert('start scan');document.getElementById(inii).value='dinesh sharma';setTimeout(\"Func1Delay()\", 500);} else { setTimeout(\"Func1Delay()\", 500);}}"];

[myWeb stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@" %@ Func1Delay(); ",str12]];

2.

/*

NSString *str1 = [NSString stringWithFormat:@"function showAlert() { alert('%@');}",str];

[myWeb stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"%@ showAlert(); ",str1]];

    */

3.[myWeb stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"var field = document.forms[0].q;" "field.value='something';"]];

//[myWeb stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"var field = document.activeElement; field.value='Dinesh Sharma';"]];