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Helpful JavaScript for Web development

Simple JavaScript for Auto-Sum with Checkboxes

This JavaScript code example uses a for loop to calculate the sum of JavaScript checkbox values (http://www.javascriptbank.com/=JavaScript checkbox value). This JavaScript will display a running total automatically wh... detail (http://www.javascriptbank.com/simple-javascript-auto-sum-with-checkboxes.html/en//) at JavaScriptBank.com - 2.000+ free JavaScript codes (http://www.javascriptbank.com/)


http://www.javascriptbank.com/javascript.images/form/simple-javascript-auto-sum-with-checkboxes.jpg (http://www.javascriptbank.com/javascript/form/checkbox-radio/simple-javascript-auto-sum-with-checkboxes/preview/en/)
Demo: JavaScript Simple JavaScript for Auto-Sum with Checkboxes (http://www.javascriptbank.com/simple-javascript-auto-sum-with-checkboxes.html/en/)


How to setup

Step 1: Use JavaScript code below to setup the script
JavaScript

<script type="text/javascript">
// Created by: Jay Rumsey | http://www.nova.edu/~rumsey/
// This script downloaded from JavaScriptBank.com

function UpdateCost() {
var sum = 0;
var gn, elem;
for (i=0; i<5; i++) {
gn = 'game'+i;
elem = document.getElementById(gn);
if (elem.checked == true) { sum += Number(elem.value); }
}
document.getElementById('totalcost').value = sum.toFixed(2);
}
</script>

Step 2: Copy & Paste HTML code below in your BODY section
HTML

<input type="checkbox" id='game0' value="9.99" onclick="UpdateCost()">Game 1 ( 9.99)<br>
<input type="checkbox" id='game1' value="19.99" onclick="UpdateCost()">Game 2 (19.99)<br>
<input type="checkbox" id='game2' value="27.50" onclick="UpdateCost()">Game 3 (27.50)<br>
<input type="checkbox" id='game3' value="45.65" onclick="UpdateCost()">Game 4 (45.65)<br>
<input type="checkbox" id='game4' value="87.20" onclick="UpdateCost()">Game 5 (87.20)<br>







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