Example of using a MessageListener with sendMessage

[Mone]

Hi,

so let's modify the buysell.js file of the PortfolioDemo (source code available in the Lightstreamer distribution).

First of all let's implement the MessageListener interface:
function MyMessageListener(num) /*implements Lightstreamer.MessageListener*/ {<br /> this.id = num;<br /> }<br /> MyMessageListener.prototype={<br /> onAbort: function() {<br /> alert("mex " + this.id + " aborted");<br /> },<br /> <br /> onDeny: function(code,err) {<br /> alert("mex " + this.id + " denied " + code + " - " + err);<br /> },<br /> <br /> onDiscarded: function() {<br /> alert("mex " + this.id + " discarded");<br /> },<br /> <br /> onError: function() {<br /> alert("mex " + this.id + " error");<br /> },<br /> <br /> onProcessed: function() {<br /> alert("mex " + this.id + " processed");<br /> }<br /> <br /> };
our simple implementation will simply alert us of the result of the request.

Then let's use it in the submitForm method.
First we need a simple counter to identify the messages, so declare a "next" var before the submitForm method:

var next = 0;<br /> function submitForm(op) {<br /> var name = document.getElementById("stockN");<br /> ...

then create a MyMessageListener instance per each message and pass it to the sendMessage method

...<br /> <br /> var mex = op + "|" + portfolioId + "|" + name + "|" + qtyN;<br /> var mexListener = new MyMessageListener(++next);<br /> engineRef.sendMessage(mex, "Orders", mexListener, 30000);<br /> }<br /> }

Obviously you'll implement the MessageListener interface to fit your needs
That's all.

HTH

[BKnight]

Thanks - that's exactly what I needed.