javascript - Input box - Prevent user from entering 0 as first digit -

i have 2 input boxes. want user should not able enter digit starts 0. note 0 @ beginning. can @ end or middle not @ beginning.

so allow 4, 40, 4440 not 04.

check fiddle i've put several other restrictions numeric values allowed, length 4. want add restriction related 0.

how can done using jquery?

html

<input name="major" size="1" value="4" class="major_rev">.  <input name="minor" size="1" value="24" class="minor_rev"> 

try this

demo

$(document).ready(function() {     //for numeric     $(".major_rev").keydown(function(event) {         // allow backspace , delete         if ( event.keycode == 46 || event.keycode == 8) {             // let happen, don't          }         else {             // ensure number , stop keypress             if ((event.keycode !==9) && (event.keycode < 48 || event.keycode > 57 )) {                 event.preventdefault();              }                    else{                if($.trim($(this).val()) =='')             {                 if(event.keycode == 48){                 event.preventdefault();                  }             }              }         }     });     $(".minor_rev").keydown(function(event) {         // allow backspace , delete         if ( event.keycode == 46 || event.keycode == 8 ) {             // let happen, don't             if($.trim($(this).val()).length==0)             {                 if(event.keycode==48){                 event.preventdefault();                  }             }         }         else {             // ensure number , stop keypress             if (event.keycode < 48 || event.keycode > 57 ) {                 event.preventdefault();              }                else{                if($.trim($(this).val()) =='')             {                 if(event.keycode == 48){                 event.preventdefault();                  }             }             }         }     });     //for maxlength     $(".major_rev").prop("maxlength","4");     $(".minor_rev").prop("maxlength","4"); });