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Any individual request will be targeted at a single page. Requests come in two forms:

component event requests target a specific component on a specific page, triggering an event within that component
render requests target a specific page, and stream the HTML markup for that page back to the client

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An event handler method may return a HttpError instance to send an error response to the client.

Code Block
public Object onAction(){ return new HttpError(302, "The Error message); }

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This querying takes the form of an event trigger. The event name is "passivate" (as we'll see shortly, there's a corresponding "activate"). The return value of the method is used as the context. For example:

Code Block

	java
	java


public class ProductDetail
{
  private Product product;

  . . .

  long onPassivate() { return product.getId(); }
}

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A page's activate event handler mirrors its passivate handler:

Code Block

	java
	java


  . . .

  void onActivate(long productId)
  {
     product = productDAO.getById(productId);
  }

  . . .

...

Code Block

	java
title	ProductListing.html
	java


  <t:loop source="products" value="product">
    <a t:type="actionlink" t:id="select" context="product.id">${product.name}</a>
  </t:loop>

Code Block

	java
title	ProductListing.java
	java


  @InjectPage
  private ProductDetails details;

  Object onActionFromSelect(long productId)
  {
    details.setProductId(productId);

    return details;
  }

Code Block

	java
title	ProductDetails.java
	java


  @Inject
  private ProductDAO dao;

  private Product product;

  @Persist
  private long productId;

  public void setProductId(long productId) { this.productId = productId; }

  void onActivate()
  {
    product = dao.getById(productId);
  }

...

Code Block

	java
title	ProductDetails.java
	java


  @Inject
  private ProductDAO dao;

  private Product product;

  private long productId;

  public void setProductId(long productId) { productId = productId; }

  void onActivate(long productId)
  {
    this.productId = productId;

    product = dao.getById(productId);
  }

  long onPassivate() { return productId; }

...

Code Block

	java
title	ProductListing.html
	java


  <t:loop source="products" value="product">
    <a t:type="pagelink" page="productdetails" context="product.id">${product.name}</a>
  </t:loop>

Code Block

	java
title	ProductListing.java
	java


No code is needed to support the link.

Code Block

	java
title	ProductDetails.java
	java


  @Inject
  private ProductDAO dao;

  private Product product;

  private long productId;

  void onActivate(long productId)
  {
    this.productId = productId;

    product = dao.getById(productId);
  }

  long onPassivate() { return productId; }

...

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