We usually follow this approach
-load initial list
-clone initial list for working copy
-if the list is likely to be altered often or by multiple persons
store a flag for each item indicating if it was removed or added
-have wicket modify the working copy (and or the flags)
-in the onsubmit load a fresh list from the db, if you have flags use
that to delete / add items. if you do not have flags your working copy
is how the list should end up, so clear list and insert all items from
working copy.
Maurice
On Wed, Mar 5, 2008 at 3:13 PM, Wojciech Biela <[EMAIL PROTECTED]> wrote:
> I don't know if the code will help, if it doesn't please just
> disregard it and answer my question
>
> regards
> Wojtek
>
> 2008/3/5, Wojciech Biela <[EMAIL PROTECTED]>:
>
>
> > Hello
> >
> > This time my question is not so general.
> >
> > We have a big form, part of this form there is a component which
> > should be a dynamic list of fields like this:
> >
> > |TextField| - remove
> > |TextField| - remove
> > |TextField| - remove
> > |TextField| - add
> >
> > if you click "add" another row "|TextField| - remove" should appear at
> > the bottom, it you should click "remove" then this row should be
> > removed
> >
> > problem we have is that the "add" and "remove" link does not send the
> > form, it only sends and ajax request to add an element to the list of
> > components and it operates (target) on a DIV that wraps the whole
> > list, so afterwards it renders the list again loosing values that were
> > already put in
> >
> > what is the preferred method to do such a thing? should the add and
> > remove link be a submit link with defaultFormProcessing set to false?
> > or maybe should we try to save values to model objects onchange in the
> > respective fields themselves
> >
> > isn't there a way to do it in a neat fashion?
> >
> > code responsible for the list component is
> >
> > wrapper = new WebMarkupContainer("attributes-wrapper");
> > listView = new ListView("attributes", attributeValuesList) {
> > public void populateItem(final ListItem listItem) {
> > final AttributeValue attributeValue = (AttributeValue)
> > listItem.getModelObject();
> > Renderer inputRenderer =
> > attributeValue.getAttribute().getInputRenderer();
> > Component component = inputRenderer.getComponent(attributeValue);
> > listItem.add(component);
> > AjaxLink addLink = new AddLink("add-link");
> > AjaxLink removeLink = new RemoveLink("remove-link", listItem);
> > if (listItem.getIndex() < (listView.getViewSize() - 1)) {
> > addLink.setVisible(false);
> > } else {
> > removeLink.setVisible(false);
> > }
> > listItem.add(addLink);
> > listItem.add(removeLink);
> > }
> > };
> > wrapper.setOutputMarkupId(true);
> >
> > HTML is
> >
> > <div wicket:id="attributes-wrapper" class="composit-wrapper">
> > <div wicket:id="attributes" class="composit">
> > <div wicket:id="attributeAndValue"
> class="composit-item"></div>
> > <div class="composit-links">
> > <a wicket:id="add-link">+ add</a>
> > <a wicket:id="remove-link">- remove</a>
> > </div>
> > </div>
> > </div>
> >
> >
> > --
> > Wojtek Biela
> >
>
>
> --
> Wojtek Biela
>
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