Textbox allows only numbers: javascript

//Html/ Jsp textbox which only allow numbers

//only numbers allowed in textbox

function numbersOnly(myfield, e)

      {

            var key;

            var keychar;

            if (window.event)

              key = window.event.keyCode;

            else if (e)

              key = e.which;

            else

              return true;

            keychar = String.fromCharCode(key);

           

            // control keys

            if ((key==null) || (key==0) || (key==8) ||

               (key==9) || (key==13) || (key==27) )

              return true;

           

            // numbers

            else if ((("0123456789.").indexOf(keychar) > -1))

              return true;

            // decimal point jump

            else

              return false;

   }

// JSP code 

use the above javascript function @ onKeyPress event like below

<s:textfield name="textbox1" id=" textbox1" maxlength="20" onkeypress="return numbersOnly(this, event);" />

// <s:textfield> is a struts tag. Html <input> tag can also be used.