org.apache.myfaces.trinidad.render

## Class RenderUtils

- java.lang.Object
- - org.apache.myfaces.trinidad.render.RenderUtils

-     public class RenderUtils
      extends Object

  Generic utilities for rendering.

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static void` | `encodeRecursive(javax.faces.context.FacesContext context, javax.faces.component.UIComponent component)` Encodes a component and all of its children.
    `static String` | `getFormId(javax.faces.context.FacesContext context, javax.faces.component.UIComponent component)` Retrieves id of the form the component is contained in.
    `static String` | `getRelativeId(javax.faces.context.FacesContext context, javax.faces.component.UIComponent from, String scopedId)` Given a 'from' component and a relativeId, return the clientId for use at rendering time that will identify the id of the component you are referencing on the client.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Method Detail

    - #### encodeRecursive

          public static void encodeRecursive(javax.faces.context.FacesContext context,
                             javax.faces.component.UIComponent component)
                                      throws IOException

      Encodes a component and all of its children.
      Throws:
        `IOException`

    - #### getFormId

          public static String getFormId(javax.faces.context.FacesContext context,
                         javax.faces.component.UIComponent component)

      Retrieves id of the form the component is contained in.
      Parameters:
        `context` - the faces context object
        `component` - UIComponent whose container form id is to be retuirned
      Returns:
        String id of the form if one exists in component's hierarchy, otherwise null

    - #### getRelativeId

          public static String getRelativeId(javax.faces.context.FacesContext context,
                             javax.faces.component.UIComponent from,
                             String scopedId)

      Given a 'from' component and a relativeId, return the clientId for use at rendering time that will identify the id of the component you are referencing on the client. This is used for attributes like e.g. "for" and "chooseId".

      e.g., given this hierarchy
      <f:subview id="aaa"> <f:subview id="xxx">
      <tr:chooseColor id="cp1" .../>
      <f:subview id="yyy">
      <tr:inputColor id="sic1" chooseId="::cp1" .../>
      </f:subview>
      </f:subview> </f:subview>

      The 'from' component is the inputColor component. The 'relativeId' is "::cp1". ('::' pops up one naming container) The return value is 'aaa:xxx:cp1' when the clientId of the 'xxx' component is 'aaa:xxx'.

      It does not assume that the target component can be located, although it does check. If it can't be found, it returns the correct relativeId anyway.

      A relativeId starting with NamingContainer.SEPARATOR_CHAR (that is, ':') will be treated as absolute (after dropping that character). A relativeId with no colons means it is within the same naming container as the 'from' component (this is within the 'from' component if 'from' is a naming container). A relativeId starting with '::' pops out of the 'from' component's naming container. If the 'from' component is a naming container, then '::' will pop out of the 'from' component itself. A relativeId with ':::' pops up two naming containers, etc. ComponentUtils.findRelativeComponent finds and returns the component, whereas this method returns a relativeId that can be used during renderering so the component can be found in javascript on the client.

      Parameters:
        `context` -
        `from` - the component to search relative to
        `scopedId` - the relative id path from the 'from' component to the component to find
      Returns:
        the clientId for the 'relative' component.
      See Also:
        `ComponentUtils.findRelativeComponent(javax.faces.component.UIComponent, java.lang.String)`, `UIComponent.findComponent(java.lang.String)`

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