Re: Validating forms inside a loop

[Steve Eynon <st...@googlemail.com>]

Hi,

I've put the above into a Mixin, which works fine, but the
implementation is a little "leaky" i.e. the containing component needs
to define it as an Implementation Mixin and set the tracker name /
context in the onPrepareForSubmit event.

I've been trying to change it so that the mixin can be applied to the
form itself and be all containing, such as,

<t:form t:mixins="multitrackerz" ...

Only I need to join, or pipe together the form's tracker parameter
with a parameter (or property) of the mixin, sort of like,

<t:form t:mixins="multitrackerz" t:tracker="multitrackerz.tracker" ...

only that's not possible. Is there another way to accomplish this?

I tried injecting the Form with @InjectContainer in the mixin, but I
can't set parameters there and there is no get / set Tracker on the
Form.

Anyone any ideas?

Steve.


On 18 February 2010 06:19, jose luis sanchez
<jo...@m-centric.com> wrote:
> Wow, you really saved my day !
> Thanks !
> El 17/02/2010, a las 23:09, Josh Canfield escribió:
>
>> The problem is that you really only have one instance of the Form
>> component, and so only one instance of the ValidationTracker. I poked
>> around and wasn't able to find an easier way to do this.
>>
>> Don't use ${} when passing the context.
>>        <t:form t:id="edit" clientValidation="false" context="message.id">
>>
>> I used the index of the loop for the context. You can modify to use
>> the message.id
>>
>>    @Component(parameters = {"tracker=tracker"})
>>    private Form _edit;
>>
>>    @Persist(PersistenceConstants.FLASH)
>>    private Map<Integer, ValidationTracker> _indexedTrackers;
>>
>>    /**
>>     * Holds the tracker created when the form is posted and we don't
>> know which form is being processed
>>     */
>>    private ValidationTracker _tmpTracker;
>>
>> @OnEvent(EventConstants.PREPARE_FOR_SUBMIT)
>>    void onPrepareForSubmitFromEdit(int index) {
>>        _formIndex = index;
>>    }
>>
>> @OnEvent(value = EventConstants.VALIDATE_FORM)
>>    void validateForm() {
>> // don't clear the errors here. Clear them after render, otherwise you
>> lose edited value tracking
>>        if (name == null) {
>>            _edit.recordError("Sorry, name is mandatory");
>>        }
>>    }
>>
>> public ValidationTracker getTracker() {
>>        if (_indexedTrackers == null) _indexedTrackers = new
>> HashMap<Integer, ValidationTracker>();
>>        if (_formIndex == null) {
>>            // it's a post and we haven't gotten to the part of the
>> action where the fields are processed
>>            if (_tmpTracker == null) _tmpTracker = new ValidationTrackerImpl();
>>            return _tmpTracker;
>>        }
>>        if (_tmpTracker != null) {
>>            // We have a temp tracker and a form index so we have now
>> processed the input fields
>>            // so we can store the temp in the map and clear it.
>>            _indexedTrackers.put(_formIndex, _tmpTracker);
>>            _tmpTracker = null;
>>        }
>>
>>        // Make sure we have a tracker for all the forms
>>        if (_indexedTrackers.get(_formIndex) == null)
>> _indexedTrackers.put(_formIndex, new ValidationTrackerImpl());
>>
>>        return _indexedTrackers.get(_formIndex);
>>    }
>>
>>    public void setTracker(ValidationTracker tracker) {
>>        if (_indexedTrackers == null) _indexedTrackers = new
>> HashMap<Integer, ValidationTracker>();
>>        if (_formIndex == null) {
>>            // We don't know which form this is for. This gets called
>> at the very end of the action
>>            // so you probably have a bug if this is getting called
>>            throw new RuntimeException("This shouldn't happen");
>>        }
>>        _indexedTrackers.put(_formIndex, tracker);
>> // Remember the trackers for the render.
>>        setIndexedTrackers(_indexedTrackers);
>>    }
>>
>>    public void setIndexedTrackers(Map<Integer, ValidationTracker>
>> indexedTrackers) {
>>        _indexedTrackers = indexedTrackers;
>>    }
>>

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