How To Validate Text Field not accept 0 as First digit and Whole digit using Javascript -

how validate text field not accept 0 first digit , whole digit using javascript. example, should not accept

0,00,000,01,02,001 , on 

it accept

10,100,10000 , on 

any appreciated

get first character of entered string/value, , check 0, on event want check, modify accordingly.

<input id="myid" value="0123" /> $('#myid').blur(function(e){  var first_char = $("#myid").val().substring(0, 1);   if (first_char == 0){    return false;    } }); 

hope helps

$( document ).ready(function() {      $('#myid').blur(function(e){   var first_char = $("#myid").val().substring(0, 1);    if (first_char == 0){     alert('first character 0');     }else{     alert('first character not 0');     }  });  });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>  <input id="myid" value="0123" />