Here's a method from David Flanagan's JavaScript: The Definitive Guide, 3rd
Edition, Example 16-2, Performing Form Validation,
http://examples.oreilly.com/jscript3/text/16-2.txt
-David
<script language="JavaScript1.1">
function verify(f)
{
var msg;
var empty_fields = "";
var errors = "";
// Loop through the elements of the form, looking for all
// text and textarea elements that don't have an "optional" property
// defined. Then, check for fields that are empty and make a list of them.
// Also, if any of these elements have a "min" or a "max" property defined,
// then verify that they are numbers and that they are in the right range.
// Put together error messages for fields that are wrong.
for(var i = 0; i < f.length; i++) {
var e = f.elements[i];
if (((e.type == "text") || (e.type == "textarea")) && !e.optional) {
// first check if the field is empty
if ((e.value == null) || (e.value == "") || isblank(e.value)) {
empty_fields += "\n " + e.name;
continue;
}
// Now check for fields that are supposed to be numeric.
if (e.numeric || (e.min != null) || (e.max != null)) {
var v = parseFloat(e.value);
if (isNaN(v) ||
((e.min != null) && (v < e.min)) ||
((e.max != null) && (v > e.max))) {
errors += "- The field " + e.name + " must be a number";
if (e.min != null)
errors += " that is greater than " + e.min;
if (e.max != null && e.min != null)
errors += " and less than " + e.max;
else if (e.max != null)
errors += " that is less than " + e.max;
errors += ".\n";
}
}
}
}
// Now, if there were any errors, display the messages, and
// return false to prevent the form from being submitted.
// Otherwise return true.
if (!empty_fields && !errors) return true;
msg = "
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