Remember that the Grid can sometimes only take you so far; if you look
at its implementation, you'll see that much of it is driven by
reusable sub-components.
I expect, in 5.2, to create an AbstractGrid that will be easier to
subclass and extend.
On Thu, Dec 3, 2009 at 3:44 AM, Thiago H. de Paula Figueiredo
<thiag...@gmail.com> wrote:
> Em Thu, 03 Dec 2009 07:41:57 -0200, Christian Riedel
> <christian-rie...@gmx.net> escreveu:
>
>> Rewriting the generated DOM sounds so easy but... How can I accomplish
>> that?
>
> I'll copy here a slighlty modified mixin I've made that adds a select tag in
> each header column. It would be simplified if I used XPath, I guess.
> I hope it'll help you.
>
> @MixinAfter // this is very important.
> @IncludeJavaScriptLibrary("classpath:/deselectColumnOptions.js")
> public class ColumnSelect {
>
> �...@afterrender
> void rewriteDOM(MarkupWriter writer) {
>
> Element element = writer.getElement();
>
> final Element table = firstChild("table", element);
> final Element thead = firstChild("thead", table);
> final Element th = thead.find("tr");
> final List<Element> headerCells = childElements(th);
>
> for (Element headerCell : headerCells) {
> addColumnField(headerCell);
> }
> ...
>
> }
>
>
> private List<Element> childElements(Element element) {
>
> List<Element> elements = new ArrayList<Element>();
>
> for (Node node : element.getChildren()) {
>
> if (node instanceof Element) {
> elements.add((Element) node);
> }
>
> }
>
> return elements;
>
> }
>
> private Element firstChild(String tag, Element element) {
>
> Element firstChild = null;
>
> List<Element> children = childElements(element);
>
> for (Element child : children) {
>
> if (child.getName().equals(tag)) {
> firstChild = child;
> }
> else {
> firstChild = firstChild(tag, child);
> }
>
> if (firstChild != null) {
> break;
> }
>
> }
>
> return firstChild;
>
> }
>
> private Element firstChild(String tag, String className, Element
> element) {
>
> Element firstChild = null;
>
> List<Element> children = childElements(element);
>
> for (Element child : children) {
>
> if (child.getName().equals(tag) &&
> child.getAttribute("class").contains(className)) {
> firstChild = child;
> }
> else {
> firstChild = firstChild(tag, child);
> }
>
> if (firstChild != null) {
> break;
> }
>
> }
>
> return firstChild;
>
> }
>
> }
>
>> <t:grid ... t:mixins="GridFooter" >
>> <p:foot>
>> <tr><td>my footer</td></tr>
>> </p:foot>
>> </t:grid>
>> First problem was to get a <tfoot> tag rendered around the block "foot"
>> that I specified as a parameter for the mixin. I tried several things, but I
>> think I need a little help here.
>
> I don't know if you can get block parameters in mixins. If not, you cannot
> use <p:foot> in your template. You'd need to add the footer programatically.
>
> Your mixin and your methods should be @AfterRender.
>
>> Instead of the desired markup this will render <tfoot></tfoot> followed by
>> the contents of the "foot"-block although the render methods are called in
>> the right order. I cannot end <tfoot> in the afterRender method because it
>> would wrap around the whole t5-grid, and moving it in the dom would be even
>> more difficult. So how can I wrap some markup around a block?
>
> Use the Element methods do to that.
>
>> Second, I didn't make it to get the table element of the grid. I hope
>> afterRender is the right place for that.
>
> I think that the best way to understand a DOM-rewriting mixin is that it
> always works after the component is rendered completely.
>
>> I don't know if that xpath command would work if I'd find the gridElement
>> in the first place, but apart from that it should work like that, right? How
>> can I get the gridElement?
>
> If your mixin works after the grid is rendered, the current element
> (markupWriter.getElement()) is the parent element of the grid.
>
>> The autocompleter mixin and some others I've seen are injecting their
>> containers (@InjectContainer ... someField) and calling
>> someField.getClientId, which would maybe a solution if grid contained a
>> getClientId method...
>
> You would only need that if you needed to hook some JavaScript to the grid.
>
> --
> Thiago H. de Paula Figueiredo
> Independent Java, Apache Tapestry 5 and Hibernate consultant, developer, and
> instructor
> Owner, software architect and developer, Ars Machina Tecnologia da
> Informação Ltda.
> http://www.arsmachina.com.br
>
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>
--
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Creator of Apache Tapestry
The source for Tapestry training, mentoring and support. Contact me to
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