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Simple example needed

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Mar 23.2005

Wondering if this can be done. I simply want two text boxes and a button labeled, “calculate”. User enters numeric values in the boxes and presses the button. I want the onclick function to add the values and write the result into a <div> below the form. Is it feasible to write the result to the page as text rather than as the value of a third text box? I will probably hide the <div> and then unhide it as part of the onclick event.

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JavaScript

6 Comments(s) ↴

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@FangMar 23.2005 — Basically this:
&lt;button type="button" onclick="document.getElementById('answer').firstChild.data='666';"&gt;result&lt;/button&gt;
&lt;div id="answer"&gt;answer&lt;/div&gt;

you can do the addition part. ?
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@betheballauthorMar 23.2005 — you can do the addition part.[/QUOTE]

Or so I thought. Obviously I still don't fully understand the basics. Can you look at what I have and tell me where I have failed to understand?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

"http://www.w3.org/TR/html4/loose.dtd">

<HTML>

<HEAD>

<TITLE>Javascript Test</TITLE>

<META http-equiv="Content-Type" content="text/html; charset=utf-8">

<script type="javascript/text">

function calculate(){

var myResult = parseFloat(document.theForm.t1.value) + parseFloat(document.theForm.t2.value)

}

</script>

</HEAD>

<BODY>

<form name="theForm" action="none">

<input type="text" name="t1" size="10" /><br />

<input type="text" name="t2" size="10" /><br />

<button type="button" onclick="document.getElementById('answer').firstChild.data=myResult;">result</button>

</form>

<div id="answer">answer</div>

</BODY>

</HTML>
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@FangMar 23.2005 — &lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd"&gt;
&lt;HTML&gt;
&lt;HEAD&gt;
&lt;TITLE&gt;Javascript Test&lt;/TITLE&gt;
&lt;META http-equiv="Content-Type" content="text/html; charset=utf-8"&gt;
&lt;script type="javascript/text"&gt;
function calculate(){
var myResult = parseFloat(document.theForm.t1.value) + parseFloat(document.theForm.t2.value)
document.getElementById('answer').firstChild.data=myResult;
}
&lt;/script&gt;
&lt;/HEAD&gt;
&lt;BODY&gt;
&lt;form name="theForm" action="none"&gt;
&lt;input type="text" name="t1" size="10" /&gt;&lt;br /&gt;
&lt;input type="text" name="t2" size="10" /&gt;&lt;br /&gt;
&lt;button type="button" onclick="calculate();"&gt;result&lt;/button&gt;
&lt;/form&gt;
&lt;div id="answer"&gt;answer&lt;/div&gt;
&lt;/BODY&gt;
&lt;/HTML&gt;
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@betheballauthorMar 23.2005 — I must have done something wrong in the function itself as both my previous version and the one you provided generate:

Line: 18

Error: Object expected
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@FangMar 23.2005 — <script type="javascript/text">

should be:

<script type="text/javascript">
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@betheballauthorMar 23.2005 — Thanks. Sometimes it doesn't pay to try and be compliant. I had always used language="javascript" until a few days ago when I found out it wasn't compliant.

Thanks for your always courteous assistance.
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