Re: FormMaps and indexed elements/collections

Note that the RepopulationFormMap that Diez is talking about is in his 
contrib package.  Look under src/org/enhydra/barracuda/contrib/dbroggisch

Also, check out the example app in his contrib project under the "webapp" 
directory in that same package which actually uses the 
RepopulationFormMap.  "webapp" isn't really a package.  Everything under it 
is a complete build system for an example app complete with its own build 
file, source directory, etc...  For more information about the contrib 
projects and running the examples, see....
http://www.barracudamvc.org/Barracuda/docs/contrib_package.html


Jake

At 06:30 PM 6/5/2003 +0200, you wrote:
>Bradley Hill wrote:
>>   I haven't seen any examples or mention of it in the mail archives, but 
>> this has to be a common issue.
>>
>>   I'm looking to create forms with indexed property sets, e.g. name1, 
>> name2, nameN, value1, value2, valueN.  I don't know until runtime how 
>> many of these properties there will be.
>>
>>   Is there a way to handle arrays and collections of values in the 
>> Barracuda forms validation package?  Struts will recognize and map 
>> parameters with names like "name[n]" and insert them properly into beans 
>> with indexed getter/setter methods.  Is there similar functionality in 
>> Barracuda or would it be easy for me to add?
>
>If you want to map and validate such values, things are easy: As HTML 
>doesn't know anything about indexed/mapped values, you will have to create 
>distinct names for every entry in your collection. E.g. for a list you do
>
><input type="text" name="mylist_1" value="foo"/>
>
>Its no problem to create a FormMap with a element for every single of 
>these input fields.
>
>The only thing missing is a convinience-function to access such a list of 
>values. But thats not too hard - simply extend DefaultFormMap (or 
>RepopulationFormMap) with methods like these (beware of pseudo-code):
>
>public Map getElementAsMap(String prefix) {
>         Map result = new HashMap();
>         for(FormElement element in getElements()) {
>            if(element.getName().startsWith(prefix)) {
>               result.put(element.getName().substring(prefix.length() + 
> 1), element.getVal());
>            }
>         }
>         return result;
>}
>
>For a list, you want to convert the keys to ints and put the values into 
>the result at the specified position.
>
>
>Now, for rendering such stuff, things get a little bit more complicated. 
>For every mapped/indexed value, you have to create a IterativeModel, so 
>you can populate its data.
>
>I could imagine the 2 new FormElements for the RepopulationFormMap could 
>add your functionality quite easy - look into CheckBoxGroupElement. Then 
>you could even access the value directly as Map/List with getElement(name) 
>on RepopulationFormMap.
>
>
>Regards, Diez
>
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