trouble using js to remove leading zeros

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  • n8kindt
    New Member
    • Mar 2008
    • 221
    #1

    trouble using js to remove leading zeros

    First of all, i haven't been to this site in a while and WOW is it much improved. I love all the new stuff--it looks great!

    I am all but done building a simple Point of Sale system through javascript but my current conflict is that our barcode scanner reads "785" as "00785." I've tried everything to filter out the zeros: regexp, converting to integer and multiplying/dividing by 1, and a couple other sidewall experimental approaches but the zeros still remain. Here's my current set up. Remember, all I want to do is screen the leading zeros from the input and this comes in on line 2.

    Code:
           
    input = parseInt(input_line.replace("^0+", '')); //it's an item number... drop zeros ... maybe?
  
}
    any suggestions??
    Tags: None
    • n8kindt
      New Member
      • Mar 2008
      • 221
      #2
      alright well i had an idea so i tried it out and it worked. here's the code i created for anyone who might run into the same problem in the future

      Code:
      <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html lang="en">
<head>
<script type="text/javascript">
trimLeading0 = function(input){
    var splitString = new Array();
    var string = new String(input);
    var returnString = '';
    var k = 1; //length counter
    
    for(var i=0;i<string.length;i++){
        splitString[i] = string.substring(i,k); //split the string up into an array
        k++;//keep the length counter going
    }
    for (var j=0;j<splitString.length;j++){
        if(splitString[j]=='0' ||  splitString[j]==0){
            //do nothing and wait for a nonzero number
        }
        else{
            for(j;j<splitString.length;j++){
                returnString = returnString +""+ splitString[j]; //put humpty dumpty back together
            }
        }
    }
    return returnString;   
}
</script>
</head>
<body>
    <script type="text/javascript">
    document.write('00548<br>');
    document.write(trimLeading0('00548'))
    </script>

</body>
</html>

        Comment

        • acoder
          Recognized Expert MVP
          • Nov 2006
          • 16032
          #3
          The regexp. would work if you used the correct syntax - either
          Code:
          input = parseInt(input_line.replace(/^0+/, ''));
          or
          Code:
          input = parseInt(input_line.replace(new RegExp("^0+"), ''));

            Comment

            • rnd me
              Recognized Expert Contributor
              • Jun 2007
              • 427
              #4
              a much faster/simpler way:

              alert( parseInt( "0000420", 10 ) );

              always use 10 when converting to a base-10 number...

                Comment

                • phvfl
                  Recognized Expert New Member
                  • Aug 2007
                  • 173
                  #5
                  Another alternative is to simply multiply by 1 which would convert the number to an integer. A very quick test over a 1,000,000 iterations indicates that this is quicker, although both are almost instant. (parseInt: 291ms, multiply: 139ms; times for 1,000,000 iterations).

                    Comment

                    • n8kindt
                      New Member
                      • Mar 2008
                      • 221
                      #6
                      you know the really wierd thing is i've tried all those suggestions listed (except the second regexp example and the alert( parseInt( "0000420", 10 ) ); ) and i had absolutely no luck. i will see if i can try to get those work again b/c i'm pretty sure those are quicker/lighter than my function.

                        Comment

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