Re: tapestry not really component based? (Example of using child components in an AbstractComponent)

[Paul Field <pa...@db.com>]

> i would be developing a component that
> inherits from AbstractComponent and needs to have links to other pages
> inside of it. now i would assume that i could use the components that have
> already been written to do this -> PageLink for example but i cannot because
> they cannot be instantiate directly in code. so i am forced to repeat
> functionality that PageLink provides within my own component. which leads me
> to think, this is not a true component based framework.


OK, I might have got the wrong end of the stick too; but you do this (using Tapestry 3.0):

In the .jwc file declare instances of the components that you want to use:

<component-specification class="MyTestComponent">
    <component id="dynamicLink" type="PageLink">
        <static-binding name="page" value="''"/>
    </component>

    <component id="dynamicLinkText" type="Insert"/>
</component-specification>



The Java class looks like this:


public abstract class MyTestComponent extends AbstractComponent  {
    private IComponent dynamicLink;
    private IComponent dynamicLinkText;

    protected void finishLoad() {
        // Wire up the children
        dynamicLink = getComponent("dynamicLink");
        dynamicLinkText = getComponent("dynamicLinkText");

        dynamicLink.addBody(dynamicLinkText);
    }

    protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) {
        String names[] = {"A", "B", "C"};

        for (String name: names) {
            dynamicLink.setProperty("targetPage", name+"Page");
            dynamicLinkText.setProperty("value", name);
            dynamicLink.render(writer, cycle);
        }
    }
}


This particular example would be better implemented as an html template with a 'Foreach' component, but it shows you how to have child components in an AbstractComponent.


This might not be quite right though: when I tried this code the links generated were:
  <a href="/app?service=page/">A</a>
  <a href="/app?service=page/BPage">B</a>
  <a href="/app?service=page/CPage">C</a>
I'm not sure why the first 'href' didn't work. Anyone know what I did wrong?


Paul

------------------
Paul Field
Global Markets Research IT
Deutsche Bank


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