Wednesday, 27 May 2009

Sys.Observer adding a POJO to the DataContext

Firstly declare a global variable

var myTemplate;

Then add

Sys.Application.add_init(function() {
dataContext = $create(Sys.Data.AdoNetDataContext, { serviceUri: "../../../WebDataService.svc" });

myTemplate = $create(Sys.UI.DataView,
dataProvider: dataContext,
fetchOperation: "DataTable",
fetchParameters: { $filter: "ID eq 1" },
autoFetch: true
command: saveCommand
null, $get("DomID"));

Then add a form input controls for the POJO property.
Then baring in mind that you have retrived just one record get that Data:

var data = myTemplate.get_data();

var myTemplateItem = data[0];

then use the Sys.Observer to add the object to the data context

Sys.Observer.setValue(myTemplateItem , "property", $("#formItem").val()); // Using jQuery selecter get value


And job done the dataContext will update the property to the database.

Very basic but you get the idea. The Sys.Observer is a very powerful tool in the Ajax arsenal.

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