Cannot use Datatable "var" bound variable in columns "value" EL expression
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Key: TOMAHAWK-492
URL: http://issues.apache.org/jira/browse/TOMAHAWK-492
Project: MyFaces Tomahawk
Type: Bug
Components: Extended Datatable
Versions: 1.1.1, 1.1.2, 1.1.4-SNAPSHOT, 1.1.3
Reporter: Tim
Priority: Minor
Assuming a backing bean that contains an attribute of ArrayList of ArrayList's
(basically a 2d array) you can not use the variable defined in "var" of
datatable, in the following example its "array'.
<t:dataTable value="#{Test.array2d}"
var="array">
<t:column>Static Stuff</t:column>
<t:columns value="#{array}"
var="column">
<h:outputText
value="T#{column}T" />
</t:columns>
</t:dataTable>
I tracked the problem down to the HtmlTableRendererBase:encodeChildren(). Where
it first calls beforeBody() and then encodeInnerHtml().
BeforeBody() enquires the rowcount() from the columns child which since its
value is bound to #{array} resolves the variable. This looks harmless, until
you realise that dataTable does not bind the variable "array" until
encodeInnerHtml() is called, hence columns.getRowCount() resolves the variable
"array" to null and does not define any columns, making them never render.
Im not sure what the "correct" fix should be, but to work around this problem I
extended HtmlTableRenderer and overroad encodeChildren():
/**
* Force the table's data model to be loaded before encoding the body,
* otherwise the variable bindings for var and varIndex are not done before
* the children columns getRowCount() in beforeBody()
*
* @see javax.faces.render.Renderer#encodeChildren(FacesContext,
UIComponent)
*/
public void encodeChildren(FacesContext facesContext, UIComponent
component) throws IOException
{
// Force the datamodel and bindings to be loaded
UIData uiData = (UIData) component;
uiData.setRowIndex(0);
if (!uiData.isRowAvailable()) {
uiData.setRowIndex(-1);
}
super.encodeChildren(facesContext, component);
}
This ensures that the model and loop variable are bound before talking to
children.
Occurs in all version (inluding nightly 1.1.4 14/6/2006)
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