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From OpenLaszlo

Introduction

This proposal calls for the client side form validation. This components will provide simple way to data validation on incoming form data, such as e-mail, dates, numbers and strings.

Demo

sample

Examples

<validatingForm>class
add each validators in this class. It dinamicaly validates when user input the values.

  <validatingForm name="myform">
    .............
    .............
    <method event="onerrorcount" args="cnt"><![CDATA[
      if(0 < cnt)
        //Error;
      else
        //Ok;
    </method>
  </validatingForm>

It's available four validators for now in the validatingForm; stringvalidator; emailvalidator; numbervalidator; datevalidator, each validators are extened from basevalidator class. basevalidator has required and requiredErrorstring attributes.

<stringvalidator>class.
Simple validation of strings, to enforce minimum and maxmun length.it has triming attribute to trim strings.
(Attributes);
minLength: OW.
maxLength: data needs shorter than this value.
trim: do trim befor validation.
minErrorstring: error message.
maxErrorstring: error messages.

  <stringvalidator required="true" minLength="5" maxLength="20" trim="true">
    <edittext name="name" />
  </stringvalidator>

<numbervalidator>class.
Simple validation for numbers to enforce minimum and maxmun value.In addtion,allow a value type, real or integer.
(Attributes);
minvalue: data need bigger than this value.
maxvalue: data need smoller than this value.
domain: real or int.
notnumberErrorstring: error message.
notintErrorstring: error message.
toobigErrorstring: error message.
toosmallErrorstring: error message.

  <numbervalidator domain="int" minvalue="-10" maxvalue="100">
    <edittext name="number" />
  </numbervalidator>

<datevalidator>class.
Provides input validation for strings treated as valid dates. It also checks the leap year day.
(Attributes);
format: set the date format(like mm/dd/yyyy).
invaliedformatErrorstring: error message.
invaliedyearErrorstring: error message.
invaliedmonthErrorstring: error message.
invalieddateErrorstring: error message.

		
  <datevalidator format="mm/dd/yyyy">
    <edittext name="birthday" />
  </datevalidator>

<emailvalidator>class.
Simple validation for standard email strings.
(Attributes);
missingatmarkErrorstring: error message.
toomanyatmarkErrorstring: error message.
missingperiodErrorstring: error message.
incorrectlydomainErrorstring: error message.

  <emailvalidator required="true">
    <edittext name="e-mail" />
  </emailvalidator>