Behaviour of xforms:bind

> Hi,
>
> I'm seeing some strange behaviour with xforms:bind
>
> The scenario is that I have 2 xforms:select1 controls - tradeName and
> manufacturer - if I know the tradeName then I know the manufacturer - so far
> so good
> However if I don't know the tradeName ('Other') then I want to be able to
> select from the list of manufacturers - again not too bad
>
> The problem arises when I select 'Other' for tradeName - the manufacturer
> list is not enabled until I save; i.e. the nodeset on the bind is not
> recalculated until after the save - I guess this is because it's looking at
> a different node during the evaluation of the [] so manufacturer hasn't
> changed but tradeName has - but once the nodeset has been evaluated it
> doesn't seem to change behaviour until it's saved i.e. won't switch between
> calcuate mode and not calculate mode.
>
> likewise if I switch from Other to something else then the calculation does
> not occur until after I've saved (so actually have to save again after that
> to ensure that the calculated value is saved)
>
> <tradeName></tradeName>
> <manufacturer></manufacturer>
>
>
> <xforms:bind nodeset="manufacturer[not(../tradeName = 'Other')]"
>                                            calculate="
>                                            for $currentItemName in
> ../tradeName return
> xxforms:instance('all-resources')//manufacturer[@tradeName =
> $currentItemName]
>                                            " />
>
>
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>

> Ian,
>
> This looks like a case of "dynamic dependencies" in binds.
>
> Bind nodesets are computed at a specific time, the so-called model
> rebuild. Outside of a rebuild, the binds nodesets remain the same.
> When this happens, running the xforms:rebuild action at the right time
> will fix things. You might want to try that.
>
> -Erik
>
> On Thu, Dec 1, 2011 at 1:28 AM, Ian Wright<[hidden email]>  wrote:
>> Hi,
>>
>> I'm seeing some strange behaviour with xforms:bind
>>
>> The scenario is that I have 2 xforms:select1 controls - tradeName and
>> manufacturer - if I know the tradeName then I know the manufacturer - so far
>> so good
>> However if I don't know the tradeName ('Other') then I want to be able to
>> select from the list of manufacturers - again not too bad
>>
>> The problem arises when I select 'Other' for tradeName - the manufacturer
>> list is not enabled until I save; i.e. the nodeset on the bind is not
>> recalculated until after the save - I guess this is because it's looking at
>> a different node during the evaluation of the [] so manufacturer hasn't
>> changed but tradeName has - but once the nodeset has been evaluated it
>> doesn't seem to change behaviour until it's saved i.e. won't switch between
>> calcuate mode and not calculate mode.
>>
>> likewise if I switch from Other to something else then the calculation does
>> not occur until after I've saved (so actually have to save again after that
>> to ensure that the calculated value is saved)
>>
>> <tradeName></tradeName>
>> <manufacturer></manufacturer>
>>
>>
>> <xforms:bind nodeset=anufacturer[not(../tradeName = 'Other')]"
>>                                             calculate=
>>                                             for $currentItemName in
>> ../tradeName return
>> xxforms:instance('all-resources')//manufacturer[@tradeName>  $currentItemName]
>>                                             " />
>>
>>
>> --
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>> list.
>> To unsubscribe: mailto:[hidden email]
>> For general help: mailto:[hidden email]?subject=lp
>> OW2 mailing lists service home page: http://www.ow2.org/wws
>>

> Erik,
> Thanks for the reply - that very nearly worked.
>
> I do have it working now - I've written this up in a bit more detail as part
> of a larger post at
> http://aelfric.co.uk/random/2011/12/xforms-select-using-an-xml-schema-xsd/ -
> however, for reference, see below for a short summary about how I got it
> working
>
> What I tried was:
> <xforms:select1 appearance="minimal" ref="name">
>    ....
> <xforms:action ev:event="xforms-value-changed">
> <xforms:rebuild model="mod-study-dashboard" />
> </xforms:action>
> </xforms:select1>
>
> This did trigger the rebuild however the evaluation of the bind appears to
> be done on the value of name prior to the change instead of the value after
> the change. (Putting a message into the action indicates that the value had
> changed at that point so it's a bit confusing....)
>
> I discovered that what works is to change a bit bucket instance
> (<xforms:insert ref="instance('binding-control')//rebuild"
> value="something"/>) instead which seems to trigger the rebuild at the right
> time
>
> Thanks,
> Ian
>
> On 19:59, Erik Bruchez wrote:
>>
>> Ian,
>>
>> This looks like a case of "dynamic dependencies" in binds.
>>
>> Bind nodesets are computed at a specific time, the so-called model
>> rebuild. Outside of a rebuild, the binds nodesets remain the same.
>> When this happens, running the xforms:rebuild action at the right time
>> will fix things. You might want to try that.
>>
>> -Erik
>>
>> On Thu, Dec 1, 2011 at 1:28 AM, Ian Wright<[hidden email]>
>>  wrote:
>>>
>>> Hi,
>>>
>>> I'm seeing some strange behaviour with xforms:bind
>>>
>>> The scenario is that I have 2 xforms:select1 controls - tradeName and
>>> manufacturer - if I know the tradeName then I know the manufacturer - so
>>> far
>>> so good
>>> However if I don't know the tradeName ('Other') then I want to be able to
>>> select from the list of manufacturers - again not too bad
>>>
>>> The problem arises when I select 'Other' for tradeName - the manufacturer
>>> list is not enabled until I save; i.e. the nodeset on the bind is not
>>> recalculated until after the save - I guess this is because it's looking
>>> at
>>> a different node during the evaluation of the [] so manufacturer hasn't
>>> changed but tradeName has - but once the nodeset has been evaluated it
>>> doesn't seem to change behaviour until it's saved i.e. won't switch
>>> between
>>> calcuate mode and not calculate mode.
>>>
>>> likewise if I switch from Other to something else then the calculation
>>> does
>>> not occur until after I've saved (so actually have to save again after
>>> that
>>> to ensure that the calculated value is saved)
>>>
>>> <tradeName></tradeName>
>>> <manufacturer></manufacturer>
>>>
>>>
>>> <xforms:bind nodeset=anufacturer[not(../tradeName = 'Other')]"
>>>
>>>                                            calculate=
>>>                                            for $currentItemName in
>>> ../tradeName return
>>> xxforms:instance('all-resources')//manufacturer[@tradeName>
>>>  $currentItemName]
>>>
>>>                                            " />
>>>
>>>
>>> --
>>> You receive this message as a subscriber of the [hidden email] mailing
>>> list.
>>> To unsubscribe: mailto:[hidden email]
>>> For general help: mailto:[hidden email]?subject=lp
>>>
>>> OW2 mailing lists service home page: http://www.ow2.org/wws
>>>
>
>
>
> --
> You receive this message as a subscriber of the [hidden email] mailing
> list.
> To unsubscribe: mailto:[hidden email]
> For general help: mailto:[hidden email]?subject=help
> OW2 mailing lists service home page: http://www.ow2.org/wws
>