org.apache.tapestry5.corelib.components
Class Trigger

java.lang.Object
  extended by org.apache.tapestry5.corelib.components.Trigger

public class Trigger
extends Object

Triggers an arbitrary event during rendering. This is often useful to add JavaScript to a page or a component (via calls to the JavaScriptSupport environmental).

Since:
5.2.0
Component Parameters
NameDescriptionTypeFlagsDefaultDefault PrefixSince
eventStringliteral
Examples:

In this example, we are showing how to trigger an event from the template of a page. When the following page is rendered the both instances of the component Trigger publish an arbitrary event.

TriggerDemo.tml

<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd">
    <body>
        <h1>Trigger Demo</h1>
        
        <p> ... </p>

        <t:trigger event="addAdditionalScriptLinks"/>

        <p> ... </p>
        
        <t:trigger event="provideAdditionalMarkup"/>
    </body>
</html>

Inside the handler method for the event addAdditionalScriptLinks we add a link to a JavaScript file. The handler method for the event provideAdditionalMarkup provides some additional markup. The MarkupWriter is passed as the event context.

TriggerDemo.java

public class TriggerDemo
{
    
    @Environmental
    private JavaScriptSupport jsSupport;
    
    @Inject @Path("context:js/scripts.js")
    private Asset scripts;
    
    public void onAddAdditionalScriptLinks()
    {
       jsSupport.importJavaScriptLibrary(scripts);
    }
    
    public void onProvideAdditionalMarkup(MarkupWriter writer)
    {   
        writer.writeRaw("Hello.");
    }
}

Constructor Summary
Trigger()
           
 
Method Summary
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Trigger

public Trigger()


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