Action script

Cyro

p.s. I would use Flex since it looks better but I don't even know where to start with it since I'm a total stranger. I understand a little from your example but that's far from anything usable.

Mone

ok, you can certainly add your timestamp client-side, in the ChartDemo you can see that the chart is based on fields 3 and 4 (setXAxis & setYAxis calls) but the subscribed table has only two fields: fields 3 and 4 are calculated client side and added to the table through addField calls;

Btw in case of a timestamp, I advise you to generate it server side to keep your data coherent: the timestamp related to the received data should be the timestamp the data was generated, not the timestamp the data was received&processed (e.g.: imagine your client running on a slow connection or two different clients subscribed to the same data but one client on a speedy machine while the other on a slow machine).

Cyro

I've added the line to push timestamp on the adapter but I still get only the value for presentation. Here's the code part:

Map<String,String> data = new HashMap<String,String>();
try {Reader r = new BufferedReader(new FileReader("C:\\primjer.txt"));
StreamTokenizer stok = new StreamTokenizer(r);
stok.parseNumbers();
// double sum = 0;
stok.nextToken();
while (stok.ttype != StreamTokenizer.TT_EOF) {
if (stok.ttype == StreamTokenizer.TT_NUMBER)
i++;
if(i%3==2){
data.put("timestamp", (new Date()).toString());
data.put("Next", Double.toString(stok.nval));
listener.update(item, data, false);
try {
Thread.sleep(10);
} catch (InterruptedException e) {
}
stok.nextToken();
}
stok.nextToken();

That part of code is in while loop. Now... The problem is that timestamp seems not to be sent. I get only Next. And if I changed that what do I have to add to client so that even timestamp gets shown in table? (Do I need schema or group?)

Cyro

and I got one new idea. I changed the timestamp above into float value that increases by 0.01 and represents time since beggining of stream. I believe I can use it as X axis. But I cannot accept it and show it as time in table on client side. I just get "Next".

Mone

first of all, sorry if I didn't notice it before, but I see that you're reusing the same map for each update.
This is not supported, please check the ItemEventListener class description.

At a first look the rest of the code seems ok, maybe you used the wrong name client side.

You can send any string through Lightstreamer, but, as long as you plot your chart with our ChartTable, any value on the axis must be a number. You can easily convert your date client-side as we do on the ChartDemo. Don't know about adobe chart libraries.

Cyro

nvm I got it to work and on the other side I get this something like this:

time Value
0.010 -0.020
0.020 -0.025
0.030 -0.010
0.040 -0.010
0.050 -0.015
0.060 -0.010
0.070 -0.020
0.080 -0.025
0.090 -0.040
0.100 -0.035
0.110 -0.055
0.120 -0.040
0.130 -0.055
0.140 -0.055
0.150 -0.045
0.160 0.005
0.170 0.030
0.180 0.060
0.190 0.055
0.200 0.120
0.210 0.085
0.220 0.055
0.230 -0.010
0.240 -0.005
0.250 -0.090
0.260 -0.095

(the values overwrite! but this is just example in which way they go.

Anyway - time is advancing 0.01 and value is erratic. I need to plot it in HTML. But I don't even get peep from that part of code. Here's client. (First part works perfectly but problem is with graph.

<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"></meta>
<script language="JavaScript" src="LS/lscommons.js"></script>
<script language="JavaScript" src="LS/lspushpage.js"></script>
</head>

<body>
<h1>Simplest</h1>
<table width="440" cellspacing="0" cellpadding="2" border="0">
<tr class="titolClass">
<td width="150">
<p style="text-align: left">Value</td>
<td width="80">Time<br><span style="font-size: 7pt"></span></td>

</tr>
<tr>
<td nowrap class="greyClass"><div class="nameClass1" source="lightstreamer" table="table1" item="Next" field="Next">Loading</div></td>
<td class="greyClass"><div class="greyClass" source="lightstreamer" table="table1" item="Next" field="timestamp">Loading</div></td>
</tr>

<script>

/////////////////PushPage Configuration

var schemaTable = ["timestamp", "Next"];
var schemaChart = ["Next", "timestamp"];
var group = ["Next"];

var lsPage = new PushPage();
var debugAlerts = false;
var remoteAlerts = false;
var pushHost = null;
var pushPort = null;
var useDomain = null;

lsPage.context.setDomain(useDomain);
lsPage.context.setDebugAlertsOnClientError(debugAlerts);
lsPage.context.setRemoteAlertsOnClientError(remoteAlerts);

lsPage.onEngineCreation = function(lsEngine) {
lsEngine.context.setDebugAlertsOnClientError(debugAlerts);
lsEngine.context.setRemoteAlertsOnClientError(remoteAlerts);

lsEngine.connection.setLSHost(pushHost);
lsEngine.connection.setLSPort(pushPort);
lsEngine.connection.setAdapterName("SIMPLEST");

lsEngine.changeStatus("STREAMING");
}

lsPage.bind();
lsPage.createEngine("SimplestEng","LS","SHARE_SESSION");

///////////////////////Table configuration

var table1 = new OverwriteTable(group, schemaTable, "MERGE");
table1.setClearOnDisconnected(true);
table1.setClearOnRemove(true);
lsPage.addTable(table1, "table1");

var lines = {};
var gTable = new ChartTable(group, schemaChart, "MERGE");
gTable.setSnapshotRequired(false);
gTable.setAreaClass("lsgbox");
gTable.setAreaWidth(1200);
gTable.setAreaHeight(300);
gTable.setAreaLeft(40);
gTable.onItemUpdate = onChartUpdate;
gTable.setClearOnRemove(true);
gTable.setClearOnDisconnected(false);
gTable.setClearOnAdd(false);

function onChartUpdate(item, upOb) {
var sec = upOb.getNewValue(table1);
var prc = upOb.getNewValue(table1);

}
</script>
</body>

</html>

Mone

you removed too much from the ChartDemo.

You need a piece of html, where the chart will be appended:
[syntax="HTML"]<div table="graph" source="lightstreamer"/>[/syntax]

and you miss some javascript that adds the table to the PushPage, and configures the axis and the chart line (you should remove your onChartUpdate function)
[syntax="JS"]//you should tell to the ChartTable which field you want to plot on the x axis
//I'm assuming that timestamp is formatted as a number server-side
gTable.setXAxis("timestamp", false);
//and you should give a min and max to it
gTable.positionXAxis(0, 1);

//you forgot to subscribe
pushPage.addTable(gTable,"graph");

var chartLine = null;
function onChartUpdate(item, upOb) {
if (!chartLine) {
chartLine = new ChartLine();
chartLine.setPointClass("lspxbig");
chartLine.setLineClass("lspx");
//you should tell to the ChartLine which field you want to plot on the y axis
chartLine.setYAxis(item,"Next",false);
//and you should give a min and max to it
chartLine.positionYAxis(-0.2,0.2);

gTable.addLine(chartLine,"anyId");
}
}[/syntax]

finally you need some CSS classes (that maybe you already have) like those:
[syntax="CSS"].lspx {
width:1px;
height:1px;
background-color: black;
}
.lspxbig {
width:1px;
height:1px;
background-color: black;
}
.lsgbox {
background: yellow;
}[/syntax]

I think that's all

Cyro

I've done what you said but still have nothing. Firebug found error on

pushpage.addtable(gTable,"graph");

so I changed it to the already defined lsPage. Now I don't get error but neither do I get anything beyond those two columns.

Mone

I can't see what I forgot...

I set up a dummy adapter that serves the same item (Next) with the same fields (Next and timestamp) as yours.

Then I use its data with this front-end html page and it works correctly (the PushPage/engine configuration is done in the external misc.js file; as you did note my PushPage object is called pushPage while yours is lsPage).

Note also that the positionXAxis and positionYAxis calls are made with static values; this is usually not appropriate and you have to find a way to configure them correctly accordingly with the data you're receiving (that's why in our ChartDemo we wait for the fist update before configuring them).

Please be sure also to check the jsDocs for the ChartTable and ChartLine classes

Try to take a look at it:

[syntax="HTML"]<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"></meta>
<script language="JavaScript" src="../commons/lightstreamer/lscommons.js"></script>
<script language="JavaScript" src="../commons/lightstreamer/lspushpage.js"></script>

<style>
.lspx {
width:1px;
height:1px;
background-color: black;
}
.lspxbig {
width:1px;
height:1px;
background-color: black;
}
.lsgbox {
background: yellow;
}
</style>
</head>

<body>

<div source="lightstreamer" table="table1" item="Next" field="Next">Loading</div>
<div source="lightstreamer" table="table1" item="Next" field="timestamp">Loading</div>

<div table="graph" source="lightstreamer"></div>

<script src="../commons/custom/misc.js" type="text/javascript"></script>
<script>

var schemaChart = ["Next", "timestamp"];
var group = ["Next"];

var table1 = new OverwriteTable(group, schemaChart, "MERGE");
table1.setClearOnDisconnected(true);
table1.setClearOnRemove(true);
pushPage.addTable(table1, "table1");

var gTable = new ChartTable(group, schemaChart, "MERGE");
gTable.setSnapshotRequired(false);
gTable.setAreaClass("lsgbox");
gTable.setAreaWidth(1200);
gTable.setAreaHeight(300);
gTable.setAreaLeft(40);
gTable.setClearOnRemove(true);
gTable.setClearOnDisconnected(false);
gTable.setClearOnAdd(false);
gTable.setXAxis("timestamp", false);
gTable.positionXAxis(0, 1);

var chartLine = new ChartLine();
chartLine.setPointClass("lspxbig");
chartLine.setLineClass("lspx");
chartLine.setYAxis("Next","Next",false);//the first "Next" is the item, the second one the field
chartLine.positionYAxis(-0.2,0.2);

gTable.addLine(chartLine,"anyId");

pushPage.addTable(gTable,"graph");

</script>
</body>

</html>
[/syntax]

HTH

Cyro

it finally works. I get the required graph. And it closely resembles sent values. I thank you for your help.

I'll go play with Flex to see if I can create a little more dynamic graph and everything but essentially I'm done. Mission acomplished. :Smile_Ag: :Smile_Ag:

ps. Can I get source code from that Flash stocklist demo just so I could see what it looks like? it may be of help in making flash application.

Alessandro Alinone

Cyro,

You can find the source code of the Flash demo inside your Lightstreamer distribution in the "DOCS-SDKs/sdk_client_flash_flex(js_bridge)/examples/FlashStockList" folder.

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