[jira] [Commented] (WICKET-4231) Palette - LoadableDetachableModel

["Sven Meier (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/WICKET-4231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151894#comment-13151894 ] 

Sven Meier commented on WICKET-4231:
------------------------------------

Your pseudo code is hard to follow, could you please provide a quickstart?
                
> Palette - LoadableDetachableModel
> ---------------------------------
>
>                 Key: WICKET-4231
>                 URL: https://issues.apache.org/jira/browse/WICKET-4231
>             Project: Wicket
>          Issue Type: Improvement
>          Components: wicket-extensions
>    Affects Versions: 1.5.3
>            Reporter: Wolfgang
>            Priority: Minor
>   Original Estimate: 5m
>  Remaining Estimate: 5m
>
> When using the Palette you get the List of all available Choices from the choicesModel via Constructor
> When this Model is a LoadableDetachableModel<List<String>> (so choices are not serialized)
> there is a problem when using as follows:
> I have a ListModel<String> as model and a LoadableDetachableModel<List<String>> for choicesModel
> So from start the model's List has some values which are *not* available in the choicesModel's List.
> Theirfor I fetch the available List from database and do an addAll of all Items in the modelList
> When you show the Palette for the first time everything is correct as all available Values are in the left List - and the presetted Values are in the right List.
> When you change nothing and just press the submit button - the updateModel() Method first clears out the model Values (including the presetted values) and then calls
> getRecorderComponent().getSelectedChoices()
> Theirfor the presetted Values are gone and the selected Value list is empty
> To clear out things:
> ModelList contains 'D'
> choicesModelList contains ('A','B','C'),
> in the load of the choiceModelList i add the D to the choiceModelList
> when just submitting form - the updateModel Method clears out the D
> and then fetches available Values again where the D already has gone.
> Workaround:
> Not using a LoadableDetachableModel but a normal ListModel works but Choices then get serialized which is not optimal.
> Prob. Solution:
> I tested with just move the line 
> Iterator<T> it = getRecorderComponent().getSelectedChoices();
> at the top of the Method
> from 501 to 495
> then it works as expected.
> org/apache/wicket/extensions/markup/html/form/palette/Palette.java 
> Line 498
> Please comment your 2 cents on this.
> Greetings

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