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Re: Made some updates to the bind module

From: Mark Birbeck <mark.birbeck@webbackplane.com>
Date: Fri, 9 Jan 2009 11:46:11 +0000
Message-ID: <ed77aa9f0901090346i16ae18b8ye6b6d77392cd2aa1@mail.gmail.com>
To: Nick_Van_den_Bleeken@inventivegroup.com
Cc: public-forms@w3.org

Hi Nick,

Sorry I wasn't able to make the call yesterday, and join the
discussion on your latest draft.

I do have some comments on the new <mip> element, which I think needs
a little more added to it.

You've captured well some of the key aspects of a MIP:

 * that it has a type, such as boolean;
 * that it may or may not cascade;
 * that the value of a MIP on a node might override the cascade, or not.

But there are some other things that need to be added:

 * that a MIP can set a CSS class on bound controls;
 * that a MIP will fire events to bound controls.

So my first suggestion is that your <mip> element should move out of
<bind> and be something that is standalone. This allows it to define
attributes that can be used in subsequent bind statements:

  <mip name="overdue" type="xs:boolean" cascade="false" />

Next we need to show how, if an author creates such a custom MIP
definition, CSS classes will be set and cleared automatically, on any
controls that are bound to nodes that have this property. As usual,
naming is tricky here, but to start the discussion off, we might
consider:

  * mip-overdue-on;
  * mip-overdue-off.

The key point is that the class name is generated using a standard
pattern that the form author can anticipate, such as:

  * mip-[name of customer MIP]-(on|off)

or:

  * mip-[name of customer MIP] and;
  * mip-not-[name of customer MIP].

We also need to define a pattern for the events that are generated, such as:

 * xforms-mip-overdue-set;
 * xforms-mip-overdue-cleared.

Once again, the names will no doubt be up for debate, but it needs to
be a fixed pattern, such as:

  * xforms-mip-[name of customer MIP]-(set|cleared)

To use a definition, an author would then do something like this:

  <mip name="overdue" type="xs:boolean" cascade="false" />

  <bind
    nodeset="due-date"
    mip-overdue="(days-from-date(now()) - days-from-date(.)) &gt; 30"
  />

  <style>
    .mip-overdue-on { background-color: red; }
  </style>

  <xf:input ref="due-date">
    <xf:label>Due date:</xf:label>
    <xf:message ev:event="xforms-mip-overdue-set" level="modeless">
      Your library books are overdue! We'll be round...
    </xf:message>
  </xf:input>

Note that the attribute is called "mip-overdue", rather than
"overdue", only to ensure that an author doesn't inadvertently attempt
to create an attribute that already exists. Another way to do this
would be to use namespaces, such as "mip:overdue".

Regards,

Mark

On Tue, Jan 6, 2009 at 4:56 PM,
<Nick_Van_den_Bleeken@inventivegroup.com> wrote:
>
> Hi,
>
> I made some updates to the bind module, the most significant change is the
> mip element to support custom MIPs and allow other modules to build on this
> to create the reaonly, relevant, required,... MIPs.
>
> There are some things about this new element that we prob. should discuss on
> a teleconf.
>
> You can find an update at
> http://www.w3.org/MarkUp/Forms/specs/XForms1.2/modules/model/bind/index-all.html
>
> Regards,
>
> Nick Van den Bleeken  -  Research & Development Manager
> Inventive Designers
> Phone: +32 - 3 - 8210170
> Fax: +32 - 3 - 8210171
> Email: Nick_Van_den_Bleeken@inventivegroup.com
>
>
> Inventive Designers' Email Disclaimer:
> http://www.inventivedesigners.com/email-disclaimer
>
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-- 
Mark Birbeck, webBackplane

mark.birbeck@webBackplane.com

http://webBackplane.com/mark-birbeck

webBackplane is a trading name of Backplane Ltd. (company number
05972288, registered office: 2nd Floor, 69/85 Tabernacle Street,
London, EC2A 4RR)
Received on Friday, 9 January 2009 11:46:51 UTC

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