Display the result of a javascript function in a div element

Question

I have a Javascript function which does the following:

• It takes the value from an list box which the user selected and assigns the value to a variable
• It then takes the number the user selected in a listbox and stores it in a variable.
• It then multiplies the value with the number to get the total
• Finally it adds 15% vat to the total
• The grand total is then displayed in an alert box

However instead of displaying the result in an alertbox I would like to display the result in an DIV element on the webpage under the form. Any ideas how I can accomplish this?

My code looks as follows:

<script type="text/javascript">
function calc()
{
var total = 0;
var course = 0;
var nrOfLessons = 0;
var vat = 0;

course = Number(document.getElementById("course").value)
nrOfLessons = Number(document.getElementById("nrOfLessons").value)

total =(course * nrOfLessons)
vat = total * 0.15
total = total+ vat;
window.alert(total)
}
</script>

 <form id="booking">
 <strong>COURSE: </strong>
 <select id="course">
 <optgroup label="English Courses">
 <option value="500">Beginner English</option>
 <option value="700">Mid-Level English</option>
 <option value="1000">Business English</option>
 </optgroup>
 <optgroup label="Thai Courses">
 <option value="500">Introduction to Thai</option>
 <option value="700">Pasa Thai</option>
 <option value="1000">Passa Thai Mak</option>
</optgroup>

</select>

<select id="nrOfLessons">
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>

</select>

Thanx in advance for all the help

Answer 1

Use innerHTML

<script type="text/javascript">
function calc()
{
var total = 0;
var course = 0;
var nrOfLessons = 0;
var vat = 0;

course = Number(document.getElementById("course").value)
nrOfLessons = Number(document.getElementById("nrOfLessons").value)

total =(course * nrOfLessons)
vat = total * 0.15
total = total+ vat;
document.getElementById('total').innerHTML = total;
}
</script>

<div id="total"></div>

Answer 2

Give your <div> an id, such as...

<div id="resultDiv"></div>

Then in your javascript set the .innerHTML property...

document.getElementById("resultDiv").innerHTML = total.toString();