Yes , you are right ,maybe using ComponentEventRequestHandler is the best
way now . But I wish that the next version of tapestry will provide some
service to render html more easily.^_^
The AjaxComponentEventRequestHandler is the key of partial-rendering , maybe
I should spend much more time to study it someday.
Here somebody named mindhawk provides another option:
//--------------------------------------------------------------
如果直接用renderqueue比较简单，不过可能有一些副作用，比如框架提供的安全检查和错误报告等都跳过啦。
If use renderqueue directly , it will be more simple , but has some negative
effect , such as security checks and error reporting provided by the
framework will be skiped .
下面给你一个简单的实现供你参考。
Here comes a simple implement for your reference
我定义了一个Tapestry的服务，负责渲染block或者rendercommand。
I define a tapestry services, for rendering the Block and Rendercommand
AppModule
=================
public static void bind(ServiceBinder binder) {
binder.bind(RenderFacade.class, RenderFacade.class); //注册服务
}
=================
RenderFacade
=================
package com.once.tapestry.services;
import java.io.PrintWriter;
import java.io.StringWriter;
import org.apache.tapestry5.Block;
import org.apache.tapestry5.ContentType;
import org.apache.tapestry5.MarkupWriter;
import org.apache.tapestry5.internal.services.RenderQueueImpl;
import org.apache.tapestry5.ioc.LoggerSource;
import org.apache.tapestry5.ioc.services.TypeCoercer;
import org.apache.tapestry5.runtime.RenderCommand;
import org.apache.tapestry5.services.MarkupWriterFactory;
import org.slf4j.Logger;
/**
* @author mindhawk
*
*/
public class RenderFacade {
private final MarkupWriterFactory markupWriterFactory;
private final LoggerSource loggerSource;
private final TypeCoercer typeCoercer;
public RenderFacade(MarkupWriterFactory markupWriterFactory,
LoggerSource loggerSource, TypeCoercer typeCoercer) {
super();
this.markupWriterFactory = markupWriterFactory;
this.loggerSource = loggerSource;
this.typeCoercer = typeCoercer;
}
public String render(Block block) {
RenderCommand command = typeCoercer.coerce(block,
RenderCommand.class);
return render(command);
}
public String render(RenderCommand command) {
MarkupWriter writer = markupWriterFactory.newMarkupWriter(new
ContentType("text/html;charset=UTF-8"));
String name = "tapestry.render.CommandRender";
Logger logger = loggerSource.getLogger(name);
RenderQueueImpl queue = new RenderQueueImpl(logger);
queue.push(command);
// Run the queue until empty.
queue.run(writer);
StringWriter stringWriter = new StringWriter();
PrintWriter pw = new PrintWriter(stringWriter);
writer.toMarkup(pw);
return stringWriter.toString();
}
}
==============
下面给出测试页面
Now comes the test page
RenderCommands （TML）：
======================
<html title="About test"
xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";
xmlns:p="tapestry:parameter">
<body>
<t:block t:id="b1">
<div>Hello world!</div>
</t:block>
<t:block t:id="b2">
<div>World peace!</div>
</t:block>
${renderB1}<br/>
${renderB2}
</body>
</html>
======================
RenderCommands （Page）：
======================
package com.once.tapestry.pages;
import org.apache.tapestry5.Block;
import org.apache.tapestry5.ioc.annotations.Inject;
import com.once.tapestry.services.RenderFacade;
public class RenderCommands {
@Inject
private Block b1;
@Inject
private Block b2;
@Inject
private RenderFacade renderFacade;
public String getRenderB1() {
return renderFacade.render(b1);
}
public String getRenderB2() {
return renderFacade.render(b2);
}
}
=======================
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