Tapestry Validators

Here we demonstrate tapestry's second declarative style of validation: Tapestry Validators. They have largely been made redundant by Bean Validation (JSR 303), but they are still supported, and the two styles can be used together.

Tapestry has these built-in Validators: Email, Max, MaxLength, Min, MinLength, None, Regexp, and Required. They all implement Validator.

In this example the TextFields specify validate="required, maxlength=10".

(required, maxLength=10)

(required, maxLength=10)

All Tapestry Validators have a server-side implementation, and most have a client-side implementation.
If the form passes client-side validation, then it is sent to the server, where, for safety, it is validated again.
To turn off client-side validation programatically, set Form's clientValidation parameter.

References: Validator, Forms and Validation, Form, TextField.

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!-- We need a doctype to allow us to use special characters like &nbsp; 
     We use a "strict" DTD to make IE follow the alignment rules. -->
     
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_4.xsd">
<body class="container">
    <h3>Tapestry Validators</h3>
    Here we demonstrate tapestry's second declarative style of validation: Tapestry Validators. 
    They have largely been made redundant by Bean Validation (JSR 303), but they are still supported, 
    and the two styles can be used together.<br/><br/>
 
    Tapestry has these built-in Validators: <em>Email</em>, <em>Max</em>, <em>MaxLength</em>, <em>Min</em>, <em>MinLength</em>, <em>None</em>, <em>Regexp</em>, and <em>Required</em>. 
    They all implement <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/Validator.html">Validator</a>. <br/><br/>
    
    In this example the TextFields specify <code>validate="required, maxlength=10"</code>.

    <div class="eg">
        <t:form class="form-horizontal" t:id="inputs">
            
            <div class="form-group">
                <t:label for="firstName" class="col-sm-3"/>
                <div class="col-sm-3">
                    <t:textfield t:id="firstName" validate="required, maxlength=10" size="10"/>
                </div>
                <div class="col-sm-6">
                    <p class="form-control-static">
                        ${firstName}
                        <span class="text-muted">
                            (required, maxLength=10)
                        </span>
                    </p>
                </div>
            </div>
            <div class="form-group">
                <t:label for="lastName" class="col-sm-3"/>
                <div class="col-sm-3">
                    <t:textfield t:id="lastName" validate="required, maxlength=10" size="10"/>
                </div>
                <div class="col-sm-6">
                    <p class="form-control-static">
                        ${lastName}
                        <span class="text-muted">
                            (required, maxLength=10)
                        </span>
                    </p>
                </div>
            </div>
            <div class="form-group">
                <div class="col-sm-3 col-sm-offset-3">
                    <t:submit/>
                </div>
            </div>
            
        </t:form>
    </div>
    
    All Tapestry Validators have a server-side implementation, and most have a client-side implementation.<br/>
    If the form passes client-side validation, then it is sent to the server, where, for safety, it is validated again.<br/>
    To turn off client-side validation programatically, set Form's <code>clientValidation</code> parameter.<br/><br/>

    References: 
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/Validator.html">Validator</a>, 
    <a href="http://tapestry.apache.org/forms-and-validation.html">Forms and Validation</a>,
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/corelib/components/Form.html">Form</a>, 
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/corelib/components/TextField.html">TextField</a>.
    <br/><br/>

    <t:pagelink page="Index">Home</t:pagelink><br/><br/>
        
    <t:tabgroup>
        <t:sourcecodetab src="/web/src/main/java/jumpstart/web/pages/examples/input/TapestryValidators.tml"/>
        <t:sourcecodetab src="/web/src/main/java/jumpstart/web/pages/examples/input/TapestryValidators.java"/>
        <t:sourcecodetab src="/web/src/main/resources/META-INF/assets/css/examples/plain.css"/>
    </t:tabgroup>
</body>
</html>



package jumpstart.web.pages.examples.input;

import org.apache.tapestry5.PersistenceConstants;
import org.apache.tapestry5.annotations.Import;
import org.apache.tapestry5.annotations.Persist;
import org.apache.tapestry5.annotations.Property;

@Import(stylesheet = "css/examples/plain.css")
public class TapestryValidators {

    // Screen fields

    @Property
    @Persist(PersistenceConstants.FLASH)
    private String firstName;

    @Property
    @Persist(PersistenceConstants.FLASH)
    private String lastName;

}



.eg {
                margin: 20px 0;
                padding: 14px;
                border: 1px solid #ddd;
                border-radius: 6px;
                -webkit-border-radius: 6px;
                -mox-border-radius: 6px;
}