PageLink (Tapestry API Documentation)

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org.apache.tapestry5.corelib.components
Class PageLink

java.lang.Object
  org.apache.tapestry5.corelib.base.AbstractLink
      org.apache.tapestry5.corelib.components.PageLink

All Implemented Interfaces:: ClientElement

public class PageLink
extends AbstractLink
extends AbstractLink

Generates a render request link to some other page in the application. If an activation context is supplied (as the context parameter), then the context values will be encoded into the URL. If no context is supplied, then the target page itself will supply the context via a passivate event.

Pages are not required to have an activation context. When a page does have an activation context, the value typically represents the identity of some object displayed or otherwise manipulated by the page.

Component Parameters
Name	Description	Type	Flags	Default	Default Prefix	Since
anchor	An anchor value to append to the generated URL (the hash separator will be added automatically).	String			literal
context	If provided, this is the activation context for the target page (the information will be encoded into the URL). If not provided, then the target page will provide its own activation context.	Object			prop
disabled	If true, then then no link element is rendered (and no informal parameters as well). The body is, however, still rendered.	boolean		false	prop
page	The logical name of the page to link to.	String	Required, Not Null		literal
parameters	If specified, the parameters are added to the link as query parameters in key=value fashion. Values will be coerced to string using value encoder; keys should be Strings.	java.util.Map	Not Null		prop	5.3

Related Components:

Examples:

We're continuing with the example introduced in the Grid examples.

The UserList page renders a series of page links, passing the user id as the context:

UserList.html (partial)

        <t:grid source="users" row="user" model="model">
            <p:lastnamecell>
                <t:pagelink page="user/view" context="user.id">${user.lastname}</t:pagelink>
            </p:lastnamecell>

        </t:grid>

ViewUser.java

The ViewUser page is responsible for converting that user id back into a User instance, by providing an event handler method for the "activate" event.

public class ViewUser
{
    private User user;

    @Inject
    private UserDAO userDAO;

    public User getUser()
    {
        return user;
    }

    void onActivate(long userId)
    {
        user = userDAO.findById(userId);
    }
}

ViewUser.tml

<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd">
    <body>
        <h1>View User</h1>

        <t:beandisplay object="user"/>
    </body>
</html>

Rendering out the User object, using a BeanDisplay component, is easy, and the template doesn't have to know or care about the page activation context; it just reads the user property.

Constructor Summary
`PageLink()`

Method Summary

Methods inherited from class org.apache.tapestry5.corelib.base.AbstractLink
`addParameters, getClientId, getLink, isDisabled, writeLink`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

PageLink

public PageLink()