Pushing complex data structure

**shreyaspurohit** · March 11th, 2009, 10:32 AM

Hi Alessandro,

Thanks for the reply. I get the point.

Regards,
Shreyas

**ctranfd** · March 29th, 2009, 01:56 AM

Hello,

I'm attempting to use JSON and a NonVisualTable on the client side - but I seem to be having trouble with including the json.js file (e.g. using http://www.json.org/json.js) with the lightstreamer js files.

The updates are working as expected when I don't include the json.js file, but the item updates don't seem to be getting picked up when the json.js is included into the page.

This is the set up I have:

Code:

<html>

<head>
	<title></title>
	<script src="js/json.js" type="text/javascript"></script>
	<script src="ls/lscommons.js" type="text/javascript"></script>
	<script src="ls/lspushpage.js" type="text/javascript"></script>
</head>

<body>
<div source="lightstreamer" table="test" item="item-test" field="fieldA" id="fieldA">
loading...
</div>

<script>

	var page = new PushPage();
	page.onEngineCreation = function(engine) {
		engine.connection.setAdapterName("TEST_ADAPTER");
		engine.changeStatus("STREAMING");
	}
	page.bind();
	page.createEngine("TestApp", "LS", "SHARE_SESSION");

	var group = ["item-test"];
	var schema = ["fieldA"];
	var pushtable = new NonVisualTable(group, schema, "MERGE");
	pushtable.setSnapshotRequired(true);

	// callback that receives the updates from the Server
	pushtable.onItemUpdate = function (item, updateInfo) {
		//alert("update received");
		if (item == null) {
			//alert("item is empty");
                        return;
		}
		if (updateInfo == null) {
			//alert("updateInfo is empty");
			return;
		}
		var value = updateInfo.getNewValue("fieldA");
		var fieldADiv = document.getElementById("fieldA");
		fieldADiv.innerHTML = value;
               
               //todo: retrieve properties from the JSON obejct
	};

	//add the table to the page
	page.addTable(pushtable, "test");

</script>

</body>
</html>

Is there something else I need to include to allow JSON to be used?

Many Thanks,

C

**Mone** · March 30th, 2009, 11:06 AM

the problem with the json.js file is that such library extends the Object's prototype that in turn breaks our code.

If you use the updated version of the json library (http://www.JSON.org/json2.js ) no conflicts will occur.

hope that helps.

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