I just wrote up some sample for someone, that I thought I would share
with the group.
Questions:
1) How do you turn a string into a dataset?
2) How do I dynamically update a dataset with some new XML so that
databound views get updated auto-magically?
The latter questions gets asked a lot. It's a pretty nifty feature of
OpenLaszlo.
In the example below, the buttons load an XML fragment (from a string),
turn that into a dataelement, then update the dataset (or part of the
dataset) with the new data:
<canvas debug="true">
<script><![CDATA[
var t ="<buddylist>"+
" <buddy name='Sarah'>"+
" <presence msg='stepped out' status='online'/>"+
" </buddy>"+
" <buddy name='Adam'>"+
" <presence msg='coding' status='online'/>"+
" </buddy>"+
" <buddy name='Bret'>"+
" <presence msg='' status='offline'/>"+
" </buddy>"+
" <buddy name='Peter'>"+
" <presence msg='working at home' status='online'/>"+
" </buddy>"+
"</buddylist>";
var p = " <buddy name='Sarah'>"+
" <presence msg='gone for the day' status='offline'/>"+
" </buddy>";
]]>
</script>
<dataset name="buddy_ds">
<buddylist>
<buddy name="Sarah">
<presence msg="sarah's message" status="online"/>
</buddy>
<buddy name="Betty">
<presence msg="betty's message" status="offline"/>
</buddy>
</buddylist>
</dataset>
<simplelayout inset="10" spacing="20"/>
<view layout="axis:x; spacing:10; inset:10">
<button text="load buddylist">
<method event="onclick">
var de = LzDataNode.stringToLzData(t);
buddy_ds.setChildNodes([de]);
</method>
</button>
<button text="load status update">
<datapointer id="dp" name="dp" xpath="buddy_ds:/buddylist"/>
<method event="onclick">
var new_de = LzDataNode.stringToLzData(p);
var buddyname = new_de.attributes.name;
var old_de = dp.xpathQuery("[EMAIL PROTECTED]'"+buddyname+"']");
//Debug.write(buddyname, old_de, dp);
old_de.parentNode.replaceChild( new_de , old_de );
</method>
</button>
</view>
<view id="v" datapath="buddy_ds:/buddylist">
<simplelayout/>
<view id="buddy" layout="axis:x; spacing:4">
<datapath xpath="buddy" pooling="true"/>
<view width="12" height="12" bgcolor="0xcccccc">
<attribute name="status" value="$path{'presence/@status'}"/>
<attribute name="bgcolor"
value="${this.status == 'online' ? 0x009900 : 0xcccccc}"/>
</view>
<text datapath="@name" width="60"/>
<text datapath="presence/@msg"/>
</view>
</view>
</canvas>
_______________________________________________
Laszlo-dev mailing list
[email protected]
http://www.openlaszlo.org/mailman/listinfo/laszlo-dev
