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Handle and precess all of your form field validations using just one script. This JavaScript can verify numeric strings; monitor the status of the CapsLock state; verify empty strings, numeric, date, alphabetical, or e-mail fields value; confirm passwords; verify the formatting of phone numbers; monitor the minimum/maximum numbers of form input characters. Includes language-independent error messages and displays error messages in a div or using an alert box.

Label: extreme, form field, validator, Ultimate Form Validator, form input, field value, validation, CapsLock, string, monitor, password

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chkform.js

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<style>
#errordiv {
  border: 1px solid red;
  background-color: #FFAFAF;
  display: none;
  width: 50%;
  margin: 5px;
  padding: 5px;
}

.required {
  background-color: #CC4444;
}

.required:focus {
  background-color: #fff;
  border: 1px solid #f00;
}

.checkit {
  background-color: #E0E5EF;
}
</style>

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<script type="text/javascript" src="chkform.js"></script><script type="text/javascript">
function configureValidation(f,alerttype){
  f.firstname.isAlphaNumeric = true;
  f.lastname.isAlphaNumeric = true;
  f.email.isEmail = true;
  f.phone.isPhoneNumber = true;
  f.birthday.isDate = true;
  f.postalcode.isEmpty = true;
  f.password1.isLengthBetween = [4,255];
  f.password2.isMatch = f.password1.value;
  f.comments.optional = true;
  var preCheck = (!f.infohtml.checked && !f.infocss.checked && !f.infojs.checked) ? errormsg[0] : null;
  return validateForm(f, preCheck, 'required', alerttype);
}
</script>

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<div>
<form action="#" method="post" onsubmit="return configureValidation(this,3)" onreset="confirm(errormsg[99])">
<table class="formtable">
<tr>
<td>First Name:</td>
<td><input class="checkit" type="text" id="First name" name="firstname" value="" class="text"></td>
</tr>
<tr>
<td>Last Name:</td>
<td><input class="checkit" type="text" id="Last name" name="lastname" value="" class="text"></td>

</tr>
<tr>
<td>Email:</td>
<td><input class="checkit" type="text" id="Email" name="email" value="" class="text"></td>
</tr>
<tr>
<td>Email Preferred:</td>
<td><select name="emailpreferred">
<option value="text">Text</option>
<option value="html">HTML</option>
<option value="flash">Flash</option>
</select></td>

</tr>
<tr>
<td>Phone: (US only) </td>
<td><input class="checkit"  type="text" id="Phone" name="phone" value="000-000-0000" class="text"></td>
</tr>
<tr>
<td>Birthday:</td>
<td><input class="checkit"  type="text" id="Birthday" name="birthday" value="mm-dd-yyyy" class="text"></td>
</tr>
<tr>
<td>Gender:</td>
<td>Male:<input type="radio"  name="gender" value="male" class="radio" checked="checked"> Female:<input type="radio" name="gender" value="female" class="radio"></td>

</tr>
<tr>
<td>Password:</td>
<td><input class="checkit" onKeyPress="checkCapsLock( event )" id="Password" type="password" name="password1" value="" class="text"></td>
</tr>
<tr>
<td>Re-Enter:</td>
<td><input class="checkit" onKeyPress="checkCapsLock( event )" id="Password again" type="password" name="password2" value="" class="text"></td>
</tr>
<tr>
<td>Postal Code</td>
<td><input class="checkit" name="postalcode" type="text" id="Postal code" onKeyPress="javascript:checkNumber(this);" onKeyUp="javascript:checkNumber(this);"></td>
</tr>
<tr>

<td colspan="2">Select one or more of the following:</td>
</tr>
<tr>
<td colspan="2">HTML:<input type="checkbox" name="infohtml" value="true" class="checkbox"> CSS:<input type="checkbox" name="infocss" value="true" class="checkbox"> JavaScript:<input type="checkbox" name="infojs" value="true" class="checkbox"></td>
</tr>
<tr>
<td>Comments:</td>
<td><textarea id="Comment" name="comments" class="text" cols="20" rows="4"></textarea></td>
</tr>

</table>
<div id="errordiv"> </div>
<div>
<input type="submit" name="submit" value="Submit" class="button"> <input type="reset" name="reset" value="Reset" class="button"></td>
</form>
</div>