Javascript Focus() function not working -

i have textbox want set focus on, doesn't work.

document.getelementbyid("txtcity").focus(); 

any idea?

maybe calling javascript before input element rendered? position input element before javascript or wait until page loaded before trigger javascript.

in order, works fine:

<input type="text" id="test" /> <script type="text/javascript">   document.getelementbyid("test").focus(); </script> 

in jquery place code within .ready() method execute code first when dom loaded:

<script type="text/javascript" src="jquery.min.js"></script> <script type="text/javascript">   $(document).ready(function () {     $("#test").focus();     // document.getelementbyid("test").focus();   }); </script>