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<!DOCTYPE html> |
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<html lang="en"> |
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<head> |
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<meta charset="utf-8"> |
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<title>Example: DataTable + DataSource.Get + JSON Data</title> |
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<link rel="stylesheet" href="http://fonts.googleapis.com/css?family=PT+Sans:400,700,400italic,700italic"> |
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<link rel="stylesheet" href="../../build/cssgrids/cssgrids-min.css"> |
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<link rel="stylesheet" href="../assets/vendor/prettify/prettify-min.css"> |
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<script src="../../build/yui/yui-min.js"></script> |
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</head> |
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<body> |
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<!-- |
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<a href="https://github.com/yui/yui3"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub"></a> |
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--> |
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<div id="doc"> |
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<div id="hd"> |
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<h1><img src="http://yuilibrary.com/img/yui-logo.png"></h1> |
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</div> |
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<h1>Example: DataTable + DataSource.Get + JSON Data</h1> |
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<div class="yui3-g"> |
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<div class="yui3-u-3-4"> |
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<div id="main"> |
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<div class="content"><style scoped> |
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/* css to counter global site css */ |
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.example table { |
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width: auto; |
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} |
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.example caption { |
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display: table-caption; |
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} |
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.example th, |
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.example td { |
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border: 0 none; |
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text-transform :none; |
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} |
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</style> |
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<div class="intro"> |
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<p> |
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This example shows how to populate a DataTable with data from the |
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Yahoo! Local webservice retrieved via a YQL query. First we create a |
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DataSource.Get instance pointing to YQL, then using the |
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DataTableDataSource plugin we can load data for pizza places near our |
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office. |
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</p> |
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<p> |
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In this example, we render the DataTable first, then load data into it |
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in a separate call. |
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</p> |
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</div> |
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<div class="example yui3-skin-sam"> |
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<div id="pizza"></div> |
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<script> |
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YUI().use("datatable", "datasource-get", "datasource-jsonschema", "datatable-datasource", function (Y) { |
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var url = "http://query.yahooapis.com/v1/public/yql?format=json" + |
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"&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys", |
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query = "&q=" + encodeURIComponent( |
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'select * from local.search ' + |
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'where zip = "94089" and query = "pizza"'), |
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dataSource, |
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table; |
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dataSource = new Y.DataSource.Get({ source: url }); |
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dataSource.plug(Y.Plugin.DataSourceJSONSchema, { |
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schema: { |
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resultListLocator: "query.results.Result", |
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resultFields: [ |
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"Title", |
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"Phone", |
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{ |
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key: "Rating", |
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locator: "Rating.AverageRating", |
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parser: function (val) { |
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// YQL is returning "NaN" for unrated restaurants |
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return isNaN(val) ? -1 : +val; |
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} |
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} |
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] |
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} |
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}); |
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table = new Y.DataTable({ |
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columns: [ |
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"Title", |
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"Phone", |
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{ |
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key: "Rating", |
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formatter: function (o) { |
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if (o.value === -1) { |
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o.value = '(none)'; |
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} |
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} |
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} |
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], |
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summary: "Pizza places near 98089", |
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caption: "Table with JSON data from YQL" |
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}); |
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table.plug(Y.Plugin.DataTableDataSource, { datasource: dataSource }); |
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table.render("#pizza"); |
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table.datasource.load({ request: query }); |
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}); |
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</script> |
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</div> |
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<h2>Populating Your DataTable with Remote Data Using DataSource.Get</h2> |
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<p> |
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Your table can be easily popluated with remote JSON data from a JSONP |
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webservice by creating a DataSource instance and using the |
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DataTableDataSource plugin to load the data into a DataTable. |
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</p> |
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<p>Start with the <code>use()</code> statement:</p> |
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<pre class="code prettyprint">YUI().use("datatable", "datasource-get", "datasource-jsonschema", "datatable-datasource", function(Y) { |
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});</pre> |
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<p> |
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Next create a DataSource.Get instance pointing to YQL. The <a |
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href="http://developer.yahoo.com/yql/console/">YQL Console</a> makes it |
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easy to determine the REST URL we want to send. You also need to define the |
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correct schema for the DataSourceJSONSchema plugin. |
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</p> |
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<pre class="code prettyprint">var dataSource = new Y.DataSource.Get({ |
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source: "http://query.yahooapis.com/v1/public/yql?"+ |
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"q=select%20*%20from%20local.search%20where%20zip%3D%2794089%27%20"+ |
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"and%20query%3D%27pizza%27&format=json&"+ |
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"env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys" |
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}); |
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dataSource.plug(Y.Plugin.DataSourceJSONSchema, { |
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schema: { |
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resultListLocator: "query.results.Result", |
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resultFields: [ "Title", "Phone", "Rating" ] |
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} |
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});</pre> |
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<p> |
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This is a good time to call <code>sendRequest</code> to make sure the data returns as |
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expected. |
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</p> |
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<pre class="code prettyprint">dataSource.sendRequest({ |
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callback: { |
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success: function(e) { |
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Y.log(e); |
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} |
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} |
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});</pre> |
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Results: |
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<pre class="code prettyprint">{ |
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"query": { |
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... |
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"results": { |
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"Result":[ |
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{ |
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"Title" : "Giovannis Pizzeria", |
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"Phone" : "(408) 734-4221", |
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... |
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"Rating": { |
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"AverageRating": "4", |
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... |
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} |
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}, |
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{ |
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"Title" : "Pizza", |
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"Phone" : "(800) 555-1212", |
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... |
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"Rating": { |
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"AverageRating":"NaN", |
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... |
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} |
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}, |
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... |
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] |
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} |
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} |
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}</pre> |
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<p> |
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Uh oh. The <code>Rating</code> data we're receiving is an object rather than a single value. It looks like <code>Rating.AverageRating</code> is what we want, but it's a numeric string, and sometimes the unfortunate value "NaN". |
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</p> |
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<p> |
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We'll add a <code>locator</code> to the schema to extract the <code>Rating.AverageRating</code> |
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value for our <code>Rating</code> data field, and also a <code>parser</code> that will convert |
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the numeric string into a real number, using <code>-1</code> for restaurants that |
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haven't received a rating yet. It's a good policy to store the table model |
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data as the appropriate type. |
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</p> |
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<pre class="code prettyprint">schema: { |
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resultListLocator: "query.results.Result", |
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resultFields: [ |
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"Title", |
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"Phone", |
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{ |
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key: "Rating", |
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locator: "Rating.AverageRating", |
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parser: function (val) { |
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return isNaN(val) : -1 : +val; |
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} |
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} |
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] |
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}</pre> |
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<p> |
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Now that the DataSource is created properly, define the columns that you |
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want your table to show. These columns map directly to the parameter names |
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returned in the data. We'll add a formatter to the <code>Rating</code> column to |
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deal with those <code>-1</code>s, instead displaying "(none)". |
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</p> |
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<pre class="code prettyprint">var cols = [ |
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"Title", |
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"Phone", |
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{ |
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key: "Rating", |
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formatter: function (o) { |
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// formatters can either return the new content or update o.value |
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if (o.value === -1) { |
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o.value = "(none)"; |
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} |
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} |
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} |
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];</pre> |
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<p> |
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Now you are ready to create a DataTable using the columns you have defined. |
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When you plug the instance with the DataTableDataSource plugin, point to |
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your DataSource instance. After you render the table, load the data via the |
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plugin. |
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</p> |
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<pre class="code prettyprint">var table = new Y.DataTable({ |
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columns : cols, |
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summary : "Pizza places near 98089", |
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caption : "Table with JSON data from YQL" |
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}); |
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table.plug(Y.Plugin.DataTableDataSource, { datasource: dataSource }); |
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table.render("#pizza"); |
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table.datasource.load();</pre> |
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<p> |
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One final change you can make is to split the URL between the DataSource |
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<code>source</code> value and the <code>request</code> value sent to the DataTableDataSource |
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plugin. Splitting the URL this way facilitates making future requests to |
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the same DataSource. You can see this in the <a href="#fullcode">Full Code |
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Listing</a> below. |
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</p> |
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<h2 id="fullcode">Full Code Listing</h2> |
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<p> |
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<strong>Note:</strong> be sure to add the <code>yui3-skin-sam</code> classname to the |
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page's <code><body></code> element or to a parent element of the widget in order to apply |
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the default CSS skin. See <a href="http://yuilibrary.com/yui/docs/tutorials/skins/">Understanding Skinning</a>. |
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</p> <!-- You need this skin class --> |
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<pre class="code prettyprint"><body class="yui3-skin-sam"> <!-- You need this skin class --></pre> |
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<pre class="code prettyprint"><div id="pizza"></div> |
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<script> |
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YUI().use("datatable", "datasource-get", "datasource-jsonschema", "datatable-datasource", function (Y) { |
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var url = "http://query.yahooapis.com/v1/public/yql?format=json" + |
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"&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys", |
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query = "&q=" + encodeURIComponent( |
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'select * from local.search ' + |
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'where zip = "94089" and query = "pizza"'), |
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dataSource, |
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table; |
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dataSource = new Y.DataSource.Get({ source: url }); |
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dataSource.plug(Y.Plugin.DataSourceJSONSchema, { |
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schema: { |
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resultListLocator: "query.results.Result", |
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resultFields: [ |
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"Title", |
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"Phone", |
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{ |
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key: "Rating", |
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locator: "Rating.AverageRating", |
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parser: function (val) { |
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// YQL is returning "NaN" for unrated restaurants |
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return isNaN(val) ? -1 : +val; |
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} |
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} |
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] |
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} |
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}); |
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table = new Y.DataTable({ |
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columns: [ |
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"Title", |
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"Phone", |
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{ |
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key: "Rating", |
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formatter: function (o) { |
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if (o.value === -1) { |
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o.value = '(none)'; |
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} |
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} |
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} |
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], |
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summary: "Pizza places near 98089", |
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caption: "Table with JSON data from YQL" |
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}); |
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table.plug(Y.Plugin.DataTableDataSource, { datasource: dataSource }); |
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table.render("#pizza"); |
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table.datasource.load({ request: query }); |
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}); |
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</script></pre> |
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<h3>Lighten the module payload</h3> |
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<p> |
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The <code>datatable</code> module includes a number of features not used in this |
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example. For a smaller module payload, use the <code>datatable-base</code> module. |
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</p> |
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<pre class="code prettyprint">// datatable-base includes only basic table rendering, but in this case, |
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// that's enough. |
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YUI().use("datatable-base", "datasource-get", "datasource-jsonschema", "datatable-datasource", function(Y) { |
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... |
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var table = new Y.DataTable({ |
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columns : cols, |
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summary : "Pizza places near 98089", |
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caption : "Table with JSON data from YQL" |
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}); |
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table.plug(Y.Plugin.DataTableDataSource, { datasource: dataSource }); |
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table.render("#pizza"); |
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table.datasource.load(); |
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});</pre> |
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</div> |
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</div> |
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</div> |
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<div class="yui3-u-1-4"> |
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<div class="sidebar"> |
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<div class="sidebox"> |
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<div class="hd"> |
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<h2 class="no-toc">Examples</h2> |
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</div> |
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<div class="bd"> |
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<ul class="examples"> |
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<li data-description="This example illustrates simple DataTable use cases."> |
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<a href="datatable-basic.html">Basic DataTable</a> |
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</li> |
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<li data-description="DataTable loaded with JSON data from a remote webservice via DataSource.Get"> |
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<a href="datatable-dsget.html">DataTable + DataSource.Get + JSON Data</a> |
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</li> |
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<li data-description="DataTable loaded with XML data from a remote webservice via DataSource.IO."> |
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<a href="datatable-dsio.html">DataTable + DataSource.IO + XML Data</a> |
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</li> |
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<li data-description="Custom format data for display."> |
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<a href="datatable-formatting.html">Formatting Row Data for Display</a> |
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</li> |
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<li data-description="DataTable with nested column headers."> |
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<a href="datatable-nestedcols.html">Nested Column Headers</a> |
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</li> |
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<li data-description="DataTable with column sorting."> |
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<a href="datatable-sort.html">Column Sorting</a> |
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</li> |
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<li data-description="DataTable with vertical and/or horizontal scrolling rows."> |
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<a href="datatable-scroll.html">Scrolling DataTable</a> |
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</li> |
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<li data-description="Using DataTable's recordType attribute to create calculated, sortable columns."> |
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<a href="datatable-recordtype.html">Sortable generated columns</a> |
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</li> |
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<li data-description="Populating one DataTable from details in the data of another."> |
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<a href="datatable-masterdetail.html">Master and detail tables</a> |
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</li> |
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<li data-description="Checkbox column that retains checked state when sorting."> |
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<a href="datatable-chkboxselect.html">Checkbox select column</a> |
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</li> |
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</ul> |
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</div> |
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</div> |
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<div class="sidebox"> |
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<div class="hd"> |
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<h2 class="no-toc">Examples That Use This Component</h2> |
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</div> |
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<div class="bd"> |
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<ul class="examples"> |
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<li data-description="Shows how to instantiate multiple Panel instances, and use nested modality to interact with a Datatable."> |
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<a href="../panel/panel-form.html">Creating a Modal Form</a> |
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</li> |
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</ul> |
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</div> |
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</div> |
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</div> |
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</div> |
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</div> |
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</div> |
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<script src="../assets/vendor/prettify/prettify-min.js"></script> |
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<script>prettyPrint();</script> |
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<script> |
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YUI.Env.Tests = { |
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|
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examples: [], |
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507 |
project: '../assets', |
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508 |
assets: '../assets/datatable', |
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name: 'datatable-dsget', |
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510 |
title: 'DataTable + DataSource.Get + JSON Data', |
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newWindow: '', |
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512 |
auto: false |
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}; |
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514 |
YUI.Env.Tests.examples.push('datatable-basic'); |
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515 |
YUI.Env.Tests.examples.push('datatable-dsget'); |
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516 |
YUI.Env.Tests.examples.push('datatable-dsio'); |
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517 |
YUI.Env.Tests.examples.push('datatable-formatting'); |
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518 |
YUI.Env.Tests.examples.push('datatable-nestedcols'); |
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519 |
YUI.Env.Tests.examples.push('datatable-sort'); |
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YUI.Env.Tests.examples.push('datatable-scroll'); |
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521 |
YUI.Env.Tests.examples.push('datatable-recordtype'); |
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522 |
YUI.Env.Tests.examples.push('datatable-masterdetail'); |
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YUI.Env.Tests.examples.push('datatable-chkboxselect'); |
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524 |
YUI.Env.Tests.examples.push('panel-form'); |
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525 |
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526 |
</script> |
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<script src="../assets/yui/test-runner.js"></script> |
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</body> |
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</html> |