AJAX Select (1)

This page demonstrates AJAX-enabling the Select component.

(optional)

The Select component does not yet have an async parameter, so use the legacy zone parameter.

References: Ajax and Zones, Zone, Select, TextField, Request, AjaxResponseRenderer, @Inject, @InjectComponent, t5/core/zone, t5/core/ajax, t5/core/forms.

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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>AJAX Select (1)</h3>
    
    <noscript class="js-required">
        ${message:javascript_required}
    </noscript>     

    This page demonstrates AJAX-enabling the Select component.

    <div class="eg">
        <t:form t:id="searchCriteria">

            <div class="form-group form-inline">

                <div class="form-group">
                    <t:label for="carMake"/>
                    <t:select t:id="carMake" model="carMakes" blankOption="ALWAYS" blankLabel="Choose..." validate="required" secure="never"
                        zone="carModelZone"/>
                </div>

                <div class="form-group">
                    <t:zone t:id="carModelZone" id="carModelZone" style="display: inline;">
                        <t:label for="carModel"/>
                        <t:select t:id="carModel" model="carModels" blankOption="ALWAYS" blankLabel="Choose..." validate="required" secure="never"/>
                    </t:zone>
                </div>

                <div class="form-group">
                    <t:label for="keywords"/>
                    <t:textfield t:id="keywords" class="keywords"/>
                </div>

                <div class="form-group">
                    <p class="form-control-static">(optional)</p>
                </div>

            </div>

            <div class="form-group">
                <t:submit value="Save"/>
            </div>
    
            <t:errors/>
        </t:form>
    </div>
    
    <p>The Select component does not yet have an <code>async</code> parameter, so use the legacy <code>zone</code> parameter.</p>

    References: 
    <a href="http://tapestry.apache.org/ajax-and-zones.html">Ajax and Zones</a>, 
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/corelib/components/Zone.html">Zone</a>,
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/corelib/components/Select.html">Select</a>,
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/corelib/components/TextField.html">TextField</a>, 
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/services/Request.html">Request</a>, 
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/services/ajax/AjaxResponseRenderer.html">AjaxResponseRenderer</a>, 
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/ioc/annotations/Inject.html">@Inject</a>, 
    <a href="http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/annotations/InjectComponent.html">@InjectComponent</a>, 
    <a href="http://tapestry.apache.org/5.4/coffeescript/zone.html">t5/core/zone</a>, 
    <a href="http://tapestry.apache.org/5.4/coffeescript/ajax.html">t5/core/ajax</a>, 
    <a href="http://tapestry.apache.org/5.4/coffeescript/forms.html">t5/core/forms</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/ajax/AjaxSelect1.tml"/>
        <t:sourcecodetab src="/web/src/main/java/jumpstart/web/pages/examples/ajax/AjaxSelect1.java"/>
        <t:sourcecodetab src="/web/src/main/resources/META-INF/assets/css/examples/ajaxselect1.css"/>
    </t:tabgroup>
</body>
</html>



package jumpstart.web.pages.examples.ajax;

import javax.validation.constraints.NotNull;

import org.apache.tapestry5.annotations.Import;
import org.apache.tapestry5.annotations.InjectComponent;
import org.apache.tapestry5.annotations.InjectPage;
import org.apache.tapestry5.annotations.Property;
import org.apache.tapestry5.corelib.components.Zone;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.services.Request;
import org.apache.tapestry5.services.ajax.AjaxResponseRenderer;

@Import(stylesheet = "css/examples/ajaxselect1.css")
public class AjaxSelect1 {
    static final private String MAKE_HONDA = "Honda";
    static final private String MAKE_TOYOTA = "Toyota";
    static final private String[] ALL_MAKES = new String[] { MAKE_HONDA, MAKE_TOYOTA };

    static final private String[] HONDA_MODELS = new String[] { "Accord", "Civic", "Jazz" };
    static final private String[] TOYOTA_MODELS = new String[] { "Camry", "Corolla" };
    static final private String[] NO_MODELS = new String[] {};

    // Screen fields

    @Property
    private String[] carMakes;

    @Property
    @NotNull
    private String carMake;

    @Property
    private String[] carModels;

    @Property
    @NotNull
    private String carModel;

    @Property
    private String keywords;

    // Other pages

    @InjectPage
    private AjaxSelect2 page2;

    // Generally useful bits and pieces

    @InjectComponent
    private Zone carModelZone;

    @Inject
    private Request request;

    @Inject
    private AjaxResponseRenderer ajaxResponseRenderer;

    // The code

    void setupRender() {
        if (carMakes == null) {
            carMakes = ALL_MAKES;
            carModels = NO_MODELS;
        }
    }

    void onValueChangedFromCarMake(String carMake) {
        
        // A new make has been chosen - clear the model.

        carModel = null;
        carModels = NO_MODELS;

        // Show the models of the chosen make.
        
        if (carMake != null) {
            if (carMake.equals(MAKE_HONDA)) {
                carModels = HONDA_MODELS;
            }
            else if (carMake.equals(MAKE_TOYOTA)) {
                carModels = TOYOTA_MODELS;
            }
        }

        if (request.isXHR()) {
            ajaxResponseRenderer.addRender(carModelZone);
        }
    }

    Object onSuccess() {
        page2.set(carMake, carModel, keywords);
        return page2;
    }
}



.eg {
                margin: 20px 0;
                padding: 14px;
                color: #888;
                border: 1px solid #ddd;
                border-radius: 6px;
                -webkit-border-radius: 6px;
                -mox-border-radius: 6px;
}

.eg select {
                width: auto;
                margin-right: 12px;
}

.eg .keywords {
                width: auto;
}