Information Systems

College of Business Administration
University of Missouri - St. Louis


Example 11
A Calculator

<HTML>
<HEAD>
<Title>A Sample DSS</title>

<SCRIPT LANGUAGE = "JavaScript">
//Function to do simple calculations
//Arguments:
// theForm - the form in which a text field
// that contains the input resides
//Return value:
// the answer, written in the text area
// that resides in theForm

function simpleCalculator(theForm)
{
if ( confirm("Do the computation now?") )
{
theForm.answer.value = eval(theForm.expression.value)
}
else
{
alert("No calculation done.")
}
}
</SCRIPT>

</HEAD>

<BODY TEXT="#000000" link="000000" VLINK="#000000" BACKGROUND="background.jpg">
<FONT FACE="ARIAL">
<CENTER><TABLE WIDTH="79%" >
<TR>
<TD>
<CENTER><H2><FONT FACE="Beehive"><FONT COLOR="#C100C1"><FONT SIZE=+4> A Sample DSS</FONT></FONT></FONT></H2></CENTER>
</TD>
</TR>
</TABLE></CENTER>

<h3>Simple Calculator </H3>

<FORM>
<B>Expression:<BR>

<INPUT TYPE = "text"
NAME = "expression"
SIZE = 15>

<INPUT TYPE = "button"
VALUE = 'Calculate'
onClick = "simpleCalculator(this.form)">
<BR>

Result:<BR>

<INPUT TYPE = "text"
NAME = "answer"
SIZE = 15>
<BR>
</form>

<p><p><p><P><hr><p>
<h4><strong><img src="button2.jpg" width = 20>
<a href="index.html">Return to Index</a>
<p><br><p>
<h6><i>Page Owner:</i> <a href="http://www.umsl.edu/~sauter/">Professor Sauter</a> (<a href="mailto:Vicki.Sauter@umsl.edu">Vicki.Sauter@umsl.edu</a>)<br>

<SCRIPT LANGUAGE = "JavaScript">
// This automatically updates the last modified date for the page.
//
when = document.lastModified
document.write("<i>This page was last modified on:</i> " + when + "<br>")
//
// This automatically updates the location documentation on the page.
where = document.location
document.write("<i>URL:</i> " + where)
</script>

<br>
© Vicki L. Sauter. All rights Reserved.
</html>


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Page Owner: Professor Sauter (Vicki.Sauter@umsl.edu)
© Vicki L. Sauter. All rights Reserved.