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Thread: Reality Check range 0-99 problem

  1. #1
    Join Date
    Oct 2013

    Reality Check range 0-99 problem

    Hi guys,
    I have a program that works fine, but I would like to add another check to the code. I want the user to only be able to enter numbers from 0-99. Can anyone suggest how I would do that. Any help is greatly appreciated.
    function totalCost(){
        //declare variables
        var snicker = parseInt(document.getElementById("snicker").value);
        var twix = parseInt(document.getElementById("twix").value);
        var chips = parseInt(document.getElementById("chips").value);
        var salesTax = 0.05;
        var total = 0;
        if (!isNaN(snicker)) {
            total += (snicker * .59);    
        if (!isNaN(twix)) {
            total += (twix * .49);
        if (!isNaN(chips)) {
            total += (chips * .39);
        total += (salesTax * total);
        if (total != 0) {
            alert("The total is " + total);
            return false;
        } else {
            alert("Invalid total cost, please make a selection");

  2. #2
    Join Date
    Jun 2008

  3. #3
    Join Date
    Mar 2007
    If you have a field that is numeric, then you can simply -0 from the string value to return a numeric value, eg.

    [CODE]var twix = document.getElementById("twix").value-0;[?CODE]

    in the HTML side of things, you can limit the number of character that the field will accept to 2 characters. You could attach a script to run on change to check that any character input is a number 0-99 as well.

    All the code you need is on developer.com and only needs searching for.
    If your post falls off the page, bump it. ...
    Please remember to wrap any code you have in forum tags:-

    [CODE]...[/CODE] [HTML]...[/HTML] [PHP]...[/PHP]

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