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# Example: DataTable + DataSource.IO + XML Data

This example shows how to populate a DataTable with data from the Yahoo! Local webservice retrieved via a same-domain script. First we create a DataSource.IO instance pointing to data, then using the DataTableDataSource plugin we can load data for Chinese restaurants near our office.

In this example, we set the `initialRequest` value in the DataTableDataSource plugin constructor so that the initial data is loaded first and then the DataTable is rendered in a separate call.

Note: XML parsing currently has known issues on the Android WebKit browser.

## Populating Your DataTable with Remote Data using DataSource.IO

Note: be sure to add the `yui3-skin-sam` classname to the page's `<body>` element or to a parent element of the widget in order to apply the default CSS skin. See Understanding Skinning.

    <body class="yui3-skin-sam"> <!-- You need this skin class -->

Your table can be easily populated with XML data from your back-end by creating a DataSource instance and using the DataTableDataSource plugin to load the data into a DataTable.

Start with the `use()` statement:

    YUI().use("datasource-io", "datasource-xmlschema", "datatable-datasource", function(Y) {
    });

Next create a DataSource.IO instance pointing to your data. (Note that in order to point the Yahoo! Local webservice, you would need to bypass cross-domain browser restrictions on XHR by creating a locally served proxy. You do not need to implement such a proxy when your data is accessed from the same domain.) Define the correct schema for the DataSourceJSONSchema plugin. This is a good time to call `sendRequest` to make sure the data returns as expected.

    var dataSource = new Y.DataSource.IO({
        source:"ylocal_proxy.php?zip=94089&query=chinese"
    });

    dataSource.plug(Y.Plugin.DataSourceXMLSchema, {
        schema: {
            resultListLocator: "Result",
            resultFields: [
                {key:"Title", locator:"*[local-name() ='Title']"},
                {key:"Phone", locator:"*[local-name() ='Phone']"},
                {key:"Rating", locator:"*[local-name()='Rating']/*[local-name()='AverageRating']"}
            ]
        }
    });

    dataSource.sendRequest({
        callback: {
            success: function (e) {
                Y.log(e);
            }
        }
    });

Now that the DataSource is created properly, define the columns that you want your table to show. These columns map directly to the parameter names returned in the data.

Now you are ready to create a DataTable using the columns you have defined. When you plug the instance with the DataTableDataSource plugin, point to your DataSource instance, and set an `initialRequest` value so that the initial data loads right way. Then call `render()` after the data response has been processed.

    var dataSource = new Y.DataSource.IO({
        source:"ylocal_proxy.php?zip=94089&query=chinese"
    });

    dataSource.plug(Y.Plugin.DataSourceXMLSchema, {
        schema: {
            resultListLocator: "Result",
            resultFields: [
                {key:"Title", locator:"*[local-name() ='Title']"},
                {key:"Phone", locator:"*[local-name() ='Phone']"},
                {key:"Rating", locator:"*[local-name()='Rating']/*[local-name()='AverageRating']"}
            ]
        }
    });

    var table = new Y.DataTable({
        columns: ["Title", "Phone", "Rating"],
        summary: "Chinese restaurants near 98089",
        caption: "Table with XML data from same-domain script"
    });
    table.plug(Y.Plugin.DataTableDataSource, {
        datasource: dataSource,
        initialRequest: ""
    });

    dataSource.after("response", function() {
        table.render("#pizza")}
    );

One final change you can make is to split the URL between the DataSource `source` value and the `request` value sent to the DataTableDataSource plugin. Splitting the URL this way facilitates making future requests to the same DataSource.

Here's the code to run the whole example:

    YUI().use("datasource-get", "datasource-jsonschema", "datatable-datasource", function(Y) {
        var dataSource = new Y.DataSource.IO({
            source: "ylocal_proxy.php?"
        });

        dataSource.plug(Y.Plugin.DataSourceXMLSchema, {
            schema: {
                resultListLocator: "Result",
                resultFields: [
                    {key:"Title", locator:"*[local-name() ='Title']"},
                    {key:"Phone", locator:"*[local-name() ='Phone']"},
                    {key:"Rating", locator:"*[local-name()='Rating']/*[local-name()='AverageRating']"}
                ]
            }
        });

        var table = new Y.DataTable({
            columns: ["Title", "Phone", "Rating"],
            summary: "Chinese restaurants near 98089",
            caption: "Table with XML data from same-domain script"
        });

        table.plug(Y.Plugin.DataTableDataSource, {
            datasource: dataSource,
            initialRequest: "zip=94089&query=chinese"
        });

        dataSource.after("response", function() {
            table.render("#pizza")}
        );

        // Make another request later
        //table.datasource.load({request:"zip=94089&query=pizza"});
    });