How to Pad a Number with Leading Zero

[HOI I27498342pb48]

For example,

I have 10 numbers blank _ _ _ _ _ _ _ _ _ _

When I input "123456" , I want the blank fill with "0000123456".

How to do this on Prepare Form?

[Nesa Nurani]

As validation script of field where you input number use this:

function zeroes(number, length) {
var str = "" + number;
while(str.length < length){
str = "0" + str;}
return str;}
if(event.value != "")
event.value = zeroes(event.value,10);

[Thom Parker]

Here's a slightly more compact method

event.value = ("0000000000" + event.value).slice(-10);

or

event.value = util.printf("%010d", event.value);

This could be used as either a format or validation script