Re: [Laszlo-user] class instancing via dataset iteration

[P T Withington]

Have a look here:  http://bit.ly/dFVIe7 which says:

> When a view's datapath matches more than one data node, one instance of the 
> view is created for each match. 

OpenLaszlo makes it very easy to automatically map over your dataset creating 
an instance for each match.

On 2011-04-15, at 13:13, Terrence Brannon wrote:

> Hello, the examples in "Laszlo in 10 minutes" do not apply to my case. I am
> trying to create instances of a class where the binding of the instance
> attributes occur via an XML dataset.
> 
> I have developed code that renders a single instance of my data:
> 
> 
> <canvas>
> 
> <class name="asanaview" bgcolor="blue" width="300" height="200">
> <attribute name="asana" type="string" />
> <attribute name="imgurl" type="string"/>
> 
> <simplelayout axis="y" spacing="4"/>
> 
> <text bgcolor="green" text="${classroot.asana}" />
> <view width="${parent.width}" stretches="both"
> resource="${classroot.imgurl}"/>
> 
> </class>
> 
> <window>
> 
>  <asanaview asana="Creeping Swan" imgurl="
> http://www.yinyga.com/images/asana_swan_sleeping.gif"; />
> <scrollbar/>
> </window>
> 
> </canvas>
> 
> but I'd like to have it iterate over a data structure with several instances
> of that data:
> 
> <asanas>
> 
> <asana>
> <img_url>http://www.yinyoga.com/images/asana_swan.gif</img_url>
> <name>Swan</name>
> <page_url>http://www.yinyoga.com/ys2_2.0_asanas_swan.php</page_url>
> </asana>
> 
> <asana>
> <img_url>http://www.yinyoga.com/images/asana_swan_sleeping.gif</img_url>
> <name>Sleeping Swan</name>
> <page_url>http://www.yinyoga.com/ys2_2.0_asanas_swan_sleeping.php</page_url>
> </asana>
> 
> <asana>
> <img_url>http://www.yinyoga.com/images/asana_toe_squat.gif</img_url>
> <name>Toe Squat</name>
> <page_url>http://www.yinyoga.com/ys2_2.0_asanas_toe_squat.php</page_url>
> </asana>
> 
> </asanas>
> 
> and render each one... the trick is that these two lines:
> 
> 
> <text bgcolor="green" text="${classroot.asana}" />
> <view width="${parent.width}" stretches="both"
> resource="${classroot.imgurl}"/>
> 
> must be rewritten to be sensitve to which instance they are in and the class
> instancing must be done as a function of the dataset.