.NET with external feed

[markgoldin]

Alright, I uderstand.
I want to show a code fragment from my modified Hello World:
<script>
/////////////////PushPage Configuration
var debugAlerts = true;
var remoteAlerts = false;

var page = new PushPage();
page.context.setDomain("ufandd.local");
page.onEngineCreation = function(lsEngine) {
lsEngine.connection.setLSHost("ufdcrdev0005.ufandd .local");
lsEngine.connection.setLSPort(8080);
lsEngine.context.setDebugAlertsOnClientError(debug Alerts);
lsEngine.context.setRemoteAlertsOnClientError(remo teAlerts);

lsEngine.connection.setAdapterName("PROXY_HELLOWOR LD");
lsEngine.changeStatus("STREAMING");
}
page.bind();
page.createEngine("HelloWorldApp", "LS", "SHARE_SESSION");

var pushtable = new OverwriteTable(null, null, "MERGE");
page.addTable(pushtable, "hellotable");
pushtable.onItemUpdate =
function(itemPos, updateInfo, itemName)
{
// send completed scan to the front-end
alert(updateInfo.getNewValue(itemPos));
serverData(updateInfo.getNewValue(itemPos));
};
</script>
As you can see I am overriding onItemUpdate because I also want to send data to somewherre else. It works fine, sort of. For the very first time alert box will pop up only once (as expected), but next data update will trigger the alert box twice: first with an empty value, second with the real value.

Can you tell me what am I doing wrong here?

BTW, my adapter's console shows one value every time.

[DarioCrivelli]

The snippet does not fully describe the test, because the

new OverwriteTable(null, null, "MERGE");

instruction asks the library to find all items and fields defined in the push cells, which are in the HTML part of the page.

To get a better idea of the update flow, please show us a Server log taken after modifying the log configuration file, by setting the priority of the "LightstreamerLogger.subscriptions" and "LightstreamerLogger.pump" categories to DEBUG.

[markgoldin]

While I am working on that I have another question:
Is it possible to hide these DIVs so they will not take any space on a page:
<div source="lightstreamer" table="hellotable" item="greetings" field="message">loading...</div>
<div source="lightstreamer" table="hellotable" item="greetings" field="timestamp">loading...</div>

Thanks

[Mone]

yes of course, you can set to their css the display:none value and then in the onChangingValues callback add such style to their hot and cold statuses:

<br /> setAttribute("message", "none", "none", "display"); <br /> setAttribute("timestamp", "none", "none", "display");<br />

Btw note that if those are the only fields in your table (ie you don't want that LS shows any cells) you can use a NonVisualTable instead of the OverwriteTable:

<br /> var pushtable = new NonVisualTable(["greetings"], ["message","timestamp"], "MERGE"); <br />

HTH.