[Laszlo-user] Create dataset dynamicly

[André Bargull]

Yeah, it's a bug, already reported at "http://www.openlaszlo.org/jira/browse/LPP-4214".

If you add this instruction before you create the new dset-instance, you should get the right results:
lz.datapointer.prototype.ppcache={}

But sadly, this will clear the whole LzParsedPath-cache (you actually don't need to mind what that means).

Alternatively, you can also do this one which should give you better performance, because it won't clear the whole cache:
lz.datapointer.prototype.ppcache["ds:/phonebook/employee"] = null;

CC-ing Henry Minsky, because he is the data-guy for OpenLaszlo.

André


taocore wrote:

> For lazy loading, I have to create dataset dynamicly. But I found that 
> destroy() method of dataset does not affect the view which use it as 
> datapath. Event if after destorying the dataset, I created a new one 
> with the same name, it seems that the view still associated with the 
> destroyed old dataset. Try the code below on the laszlo explorer online. 
> Any sugguestions would be much appreciated.
>
>
> <canvas debug="true">
>
>    <class name="dset" extends="dataset"
>
>             request="true" type="http"
>
>             src="getemployees.jsp"/>
>
>    <script>
>
>       new dset(canvas, {name:'ds'});
>
>    </script>
>
>    <simplelayout axis="y"/>
>
>
>
>    <view name="v" datapath="ds:/phonebook/employee">
>
>      <simplelayout axis="x"/>
>
>      <text datapath="firstName/text()"/>
>
>      <text datapath="lastName/text()"/>
>
>      <text datapath="phone/text()"/>
>
>    </view>
>
>
>    <view name="bbb" bgcolor="yellow">
>
>      <simplelayout axis="x"/>
>
>      <text datapath="firstName/text()"/>
>
>      <text datapath="lastName/text()"/>
>
>      <text datapath="phone/text()"/>
>
>    </view>
>
>
>    <button>ok
>
>      <method event="onclick">
>
>         var dp = ds.getPointer();
>
>
>         dp.selectChild();
>
>         dp.selectChild();
>
>         Debug.write(dp.serialize());
>
>         dp.deleteNode();
>
>         dp.deleteNode();
>
>         ds.abort();
>
>         ds.destroy();
>
>
>
>         new dset(canvas, {name:'ds'});
>
>         Debug.write(ds.serialize());
>
>         parent.bbb.setDatapath("ds:/phonebook/employee");
>
>         ds.doRequest();
>
>      </method>
>
>    </button>
>
> </canvas>
>
>
>
>
> taocore

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Official OpenLaszlo-Committer ^_^