<SCRIPT>
function calculate(form,
callingField) {
if (callingField == "result") { //
is the calling field the "result" field?
//
is the "square" radio button checked?
if
(form.action[1].checked)
form.entry.value = Math.sqrt(form.result.value);
else form.entry.value
= form.result.value / 2;
}
else {
if (form.action[1].checked)
form.result.value = form.entry.value * form.entry.value;
else form.result.value = form.entry.value * 2;
}
}
</SCRIPT>
<FORM>
Value:
<INPUT
TYPE="text"
NAME="entry"
VALUE="0"
onChange="calculate(this.form,
this.name);">
Action:
<INPUT
TYPE="radio"
NAME="action"
VALUE="twice"
onClick="calculate(this.form,
this.name);">
Double
<INPUT
TYPE="radio"
NAME="action"
VALUE="square"
onClick="calculate(this.form,
this.name);">
Square Result:
<INPUT
TYPE="text"
NAME="result"
VALUE="0"
onChange="calculate(this.form,
this.name);">
</FORM>
calculate(this.form,
this.name) passes 2 parameters:
this.form -- because we want to
pass all the form's information to the function
this.name -- to tell the function
what particular form element made the call
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