LFC-$28.lzx

<canvas height="250" debug="true">
  <debug y="100"/> 
  <dataset type="http" name="weatherdata" src="http://www.laszlosystems.com/cgi-pub/weather.cgi"/> 
  <view>
     <inputtext width="90" name="t">zip</inputtext>
     <button>  submit
       <handler name="onclick"> var d = canvas.datasets.weatherdata;
         Debug.debug("sending request for weather data.");
         d.setQueryString({zip : parent.t.text});
         d.doRequest(); 
       </handler>
     </button>
     <datapointer xpath="weatherdata:/weather">
       <handler name="ondata">
         var duplicate_pointer = this.dupePointer();
         duplicate_pointer.selectChild();
         while (duplicate_pointer.selectNext()){
           Debug.debug("%w", duplicate_pointer.serialize());
         }
       </handler>
     </datapointer>
     <simplelayout axis="x"/>
   </view>
 </canvas>