Javascript to trim leading 0 (zero) from text input fields

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How can I trim a string in JavaScript?

Javascript to trim leading 0 (zero) from text input fields

8 comments. Current rating: 4 stars

(3 votes). Leave comments and/ or rate it.

Question:

I need to trim leading 0 (zero) from text input fields

Answer:

Use the Javascript substr() function, or just copy trimNumber() from below.

<script language="JavaScript" type="text/javascript">
<!--
function trimNumber(s) {
  while (s.substr(0,1) == '0' && s.length>1) { s = s.substr(1,9999); }
  return s;
}

var s = '00123';
alert(s + '=' + trimNumber(s));

// end hiding contents -->
</script>

Comments:

2007-04-10, 09:55:59

[hidden] from United States

would this 'trimnumber()' function affect the origional variable 's' or would it just return a new value without the zeros in front

2007-08-29, 07:50:04

anonymous from United States

A pretty nice script, elegant... One little modification... the javascript 'substr' has an overload that allows one parameter (the start position). If you don't specify the number of characters it will read to the end of the string (even if the string is 10,001 characters long, which yours wont do).

2007-09-10, 09:17:32

anonymous from Canada

it is really helpful

2007-09-10, 21:51:30

anonymous from United States

SERIOUS QUESTION THAT WOULD PREFER ANSWERING
would this 'trimnumber()' function affect the original variable 's' or would it just return a new value without the zeros in front

2008-01-09, 06:15:16

anonymous from United Kingdom

useful

2008-03-01, 13:48:54

anonymous from United States

How about using Regular Expressions instead:

function trimNumber(s) {
return s.replace(/^0+/, '');
}

Same result with no looping. The original value of s is not affected by either function.

2008-03-05, 13:53:18

anonymous from United States

how about
function trimNumber(s) {
return s * 1;
}

2008-04-23, 07:49:36

anonymous from United States

function trimNumber(s) {
return s * 1;
}

does not work for decimal number. 1.00 * 1 = 1


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