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<div id="pagetitle"><h1>YUI Library Examples: DataSource Utility: DataSource.Function</h1></div>
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<h2>DataSource Utility: DataSource.Function</h2>
<div id="example" class="promo">
<div class="example-intro">
DataSource.Function allows the implementer to define a JavaScript function that returns data values, for maximum customizeability. A <a href="http://developer.yahoo.com/yui/3/dataschema/">DataSchema</a> plugin is used to normalize incoming data into a known format for consistency of usage by other components.
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<a href="datasource_function_clean.html" target="_blank">View example in new window.</a>
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<form id="demo">
<h4>Array</h4>
<h6>Data</h6>
<pre>
[
{name:"abc",id:123},
{name:"def",id:456},
{name:"ghi",id:789}
]
</pre>
<h6>Schema</h6>
<pre>
{
resultFields: ["name","id"]
}
</pre>
<h6>Normalized data</h6>
<input type="button" id="demo_array" value="Retrieve data =>">
<div id="demo_output_array" class="output"></div>
<h4>JSON</h4>
<h6>Data</h6>
<pre>
{
"profile":{
"current":160,
"target":150
},
"reference": [
{
"category":"exercise",
"type":"expenditure",
"activities":[
{"name":"biking", "calories":550},
{"name":"golf", "calories":1000},
{"name":"running", "calories":650},
{"name":"swimming", "calories":650},
{"name":"walking", "calories":225}
]
},
{
"category":"nutrition",
"type":"intake",
"fruit":[
{"name":"apple", "calories":70},
{"name":"banana", "calories":70},
{"name":"orange", "calories":90},
],
"vegetables":[
{"name":"baked potato", "calories":150},
{"name":"broccoli", "calories":50},
{"name":"green beans", "calories":30}
]
}
],
"program": [
{
"category":"exercise",
"schedule":[
{"day":"sunday", "activity":"swimming"},
{"day":"monday", "activity":"running"},
{"day":"tuesday", "activity":"biking"},
{"day":"wednesday", "activity":"running"},
{"day":"thursday", "activity":"swimming"},
{"day":"friday", "activity":"running"},
{"day":"saturday", "activity":"golf"}
]
},
{
"category":"diet",
"schedule":[
]
}
]
}
</pre>
<h6>Schema</h6>
<pre>
{
resultListLocator: "reference[1].fruit",
resultFields: ["name","calories"]
}
</pre>
<h6>Normalized data</h6>
<input type="button" id="demo_json" value="Retrieve data =>">
<div id="demo_output_json" class="output"></div>
</form>
<script type="text/javascript">
YUI({base:"../../build/", timeout: 10000}).use("dump", "node", "datasource-function", "datasource-arrayschema", "datasource-jsonschema", function (Y) {
var myFunctionArray = function(request) {
return [
{name:"abc",id:123},
{name:"def",id:456},
{name:"ghi",id:789}
];
},
myDataSourceArray = new Y.DataSource.Function({source:myFunctionArray}),
myCallbackArray = {
success: function(e){
Y.get("#demo_output_array").setContent(Y.dump(e.response));
},
failure: function(e){
Y.get("#demo_output_array").setContent("Could not retrieve data: " + e.error.message);
}
};
myDataSourceArray.plug(Y.Plugin.DataSourceArraySchema, {
schema: {
resultFields: ["name","id"]
}
});
Y.on("click", function(e){
myDataSourceArray.sendRequest(null, myCallbackArray);
}, "#demo_array");
var myFunctionJSON = function(request) {
return {"profile":{"current":160,"target":150},"reference": [{"category":"exercise","type":"expenditure","activities":[{"name":"biking", "calories":550},{"name":"golf", "calories":1000},{"name":"running", "calories":650},{"name":"swimming", "calories":650},{"name":"walking", "calories":225}]},{"category":"nutrition","type":"intake","fruit":[{"name":"apple", "calories":70},{"name":"banana", "calories":70},{"name":"orange", "calories":90},],"vegetables":[{"name":"baked potato", "calories":150},{"name":"broccoli", "calories":50},{"name":"green beans", "calories":30}]}],"program": [{"category":"exercise","schedule":[{"day":"sunday", "activity":"swimming"},{"day":"monday", "activity":"running"},{"day":"tuesday", "activity":"biking"},{"day":"wednesday", "activity":"running"},{"day":"thursday", "activity":"swimming"},{"day":"friday", "activity":"running"},{"day":"saturday", "activity":"golf"}]},{"category":"diet","schedule":[]}]};
},
myDataSourceJSON = new Y.DataSource.Function({source:myFunctionJSON}),
myCallbackJSON = {
success: function(e){
Y.get("#demo_output_json").setContent(Y.dump(e.response));
},
failure: function(e){
Y.get("#demo_output_json").setContent("Could not retrieve data: " + e.error.message);
}
};
myDataSourceJSON.plug(Y.Plugin.DataSourceJSONSchema, {
schema: {
resultListLocator: "reference[1].fruit",
resultFields: ["name","calories"]
}
});
Y.on("click", function(e){
myDataSourceJSON.sendRequest(null, myCallbackJSON);
}, "#demo_json");
});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<p>Your custom function can return arbitrary data, so use the appropriate schema plugin to normalize the data into a consistent format. Array data would use a DataSourceArraySchema plugin:</p>
<div id="syntax1" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1">YUI<span class="br0">(</span><span class="br0">)</span>.<span class="kw2">use</span><span class="br0">(</span><span class="st0">"datasource-function"</span><span class="sy0">,</span> <span class="st0">"datasource-arrayschema"</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">(</span>Y<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> myFunction <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>request<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw1">return</span> <span class="br0">[</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span><span class="kw3">name</span><span class="sy0">:</span><span class="st0">"abc"</span><span class="sy0">,</span>id<span class="sy0">:</span><span class="nu0">123</span><span class="br0">}</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2"> <span class="br0">{</span><span class="kw3">name</span><span class="sy0">:</span><span class="st0">"def"</span><span class="sy0">,</span>id<span class="sy0">:</span><span class="nu0">456</span><span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span><span class="kw3">name</span><span class="sy0">:</span><span class="st0">"ghi"</span><span class="sy0">,</span>id<span class="sy0">:</span><span class="nu0">789</span><span class="br0">}</span></div></li><li class="li1"><div class="de1"> <span class="br0">]</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> myDataSource <span class="sy0">=</span> <span class="kw2">new</span> Y.<span class="me1">DataSource</span>.<span class="kw2">Function</span><span class="br0">(</span><span class="br0">{</span>source<span class="sy0">:</span>myFunction<span class="br0">}</span><span class="br0">)</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2"> myCallback <span class="sy0">=</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> success<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">(</span>e<span class="br0">)</span><span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw3">alert</span><span class="br0">(</span>e.<span class="me1">response</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> failure<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">(</span>e<span class="br0">)</span><span class="br0">{</span></div></li><li class="li2"><div class="de2"> <span class="kw3">alert</span><span class="br0">(</span><span class="st0">"Could not retrieve data: "</span> <span class="sy0">+</span> e.<span class="me1">error</span>.<span class="me1">message</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> myDataSource.<span class="me1">plug</span><span class="br0">(</span>Y.<span class="me1">Plugin</span>.<span class="me1">DataSourceArraySchema</span><span class="sy0">,</span> <span class="br0">{</span></div></li><li class="li2"><div class="de2"> schema<span class="sy0">:</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> resultFields<span class="sy0">:</span> <span class="br0">[</span><span class="st0">"name"</span><span class="sy0">,</span><span class="st0">"id"</span><span class="br0">]</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li2"><div class="de2"> myDataSource.<span class="me1">sendRequest</span><span class="br0">(</span><span class="kw2">null</span><span class="sy0">,</span> myCallback<span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"><span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;">YUI<span class="br0">(</span><span class="br0">)</span>.<span class="kw2">use</span><span class="br0">(</span><span class="st0">"datasource-function"</span><span class="sy0">,</span> <span class="st0">"datasource-arrayschema"</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">(</span>Y<span class="br0">)</span> <span class="br0">{</span>
<span class="kw2">var</span> myFunction <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>request<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">return</span> <span class="br0">[</span>
<span class="br0">{</span><span class="kw3">name</span><span class="sy0">:</span><span class="st0">"abc"</span><span class="sy0">,</span>id<span class="sy0">:</span><span class="nu0">123</span><span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span><span class="kw3">name</span><span class="sy0">:</span><span class="st0">"def"</span><span class="sy0">,</span>id<span class="sy0">:</span><span class="nu0">456</span><span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span><span class="kw3">name</span><span class="sy0">:</span><span class="st0">"ghi"</span><span class="sy0">,</span>id<span class="sy0">:</span><span class="nu0">789</span><span class="br0">}</span>
<span class="br0">]</span><span class="sy0">;</span>
<span class="br0">}</span><span class="sy0">,</span>
myDataSource <span class="sy0">=</span> <span class="kw2">new</span> Y.<span class="me1">DataSource</span>.<span class="kw2">Function</span><span class="br0">(</span><span class="br0">{</span>source<span class="sy0">:</span>myFunction<span class="br0">}</span><span class="br0">)</span><span class="sy0">,</span>
myCallback <span class="sy0">=</span> <span class="br0">{</span>
success<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">(</span>e<span class="br0">)</span><span class="br0">{</span>
<span class="kw3">alert</span><span class="br0">(</span>e.<span class="me1">response</span><span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span><span class="sy0">,</span>
failure<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">(</span>e<span class="br0">)</span><span class="br0">{</span>
<span class="kw3">alert</span><span class="br0">(</span><span class="st0">"Could not retrieve data: "</span> <span class="sy0">+</span> e.<span class="me1">error</span>.<span class="me1">message</span><span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="br0">}</span><span class="sy0">;</span>
myDataSource.<span class="me1">plug</span><span class="br0">(</span>Y.<span class="me1">Plugin</span>.<span class="me1">DataSourceArraySchema</span><span class="sy0">,</span> <span class="br0">{</span>
schema<span class="sy0">:</span> <span class="br0">{</span>
resultFields<span class="sy0">:</span> <span class="br0">[</span><span class="st0">"name"</span><span class="sy0">,</span><span class="st0">"id"</span><span class="br0">]</span>
<span class="br0">}</span>
<span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span>
myDataSource.<span class="me1">sendRequest</span><span class="br0">(</span><span class="kw2">null</span><span class="sy0">,</span> myCallback<span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span></pre></div><textarea id="syntax1-plain">YUI().use("datasource-function", "datasource-arrayschema", function(Y) {
var myFunction = function(request) {
return [
{name:"abc",id:123},
{name:"def",id:456},
{name:"ghi",id:789}
];
},
myDataSource = new Y.DataSource.Function({source:myFunction}),
myCallback = {
success: function(e){
alert(e.response);
},
failure: function(e){
alert("Could not retrieve data: " + e.error.message);
}
};
myDataSource.plug(Y.Plugin.DataSourceArraySchema, {
schema: {
resultFields: ["name","id"]
}
});
myDataSource.sendRequest(null, myCallback);
});</textarea></div>
<p>Whereas JSON data would use a DataSourceJSONSchema plugin:</p>
<div id="syntax2" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1">YUI<span class="br0">(</span><span class="br0">)</span>.<span class="kw2">use</span><span class="br0">(</span><span class="st0">"datasource-function"</span><span class="sy0">,</span> <span class="st0">"datasource-jsonschema"</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">(</span>Y<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> myFunction <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>request<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw1">return</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="st0">"profile"</span><span class="sy0">:</span><span class="br0">{</span></div></li><li class="li2"><div class="de2"> <span class="st0">"current"</span><span class="sy0">:</span><span class="nu0">160</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="st0">"target"</span><span class="sy0">:</span><span class="nu0">150</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="st0">"reference"</span><span class="sy0">:</span> <span class="br0">[</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span></div></li><li class="li2"><div class="de2"> ...</div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="st0">"category"</span><span class="sy0">:</span><span class="st0">"nutrition"</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="st0">"type"</span><span class="sy0">:</span><span class="st0">"intake"</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2"> <span class="st0">"fruit"</span><span class="sy0">:</span><span class="br0">[</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"apple"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">70</span><span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"banana"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">70</span><span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"orange"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">90</span><span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">]</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2"> <span class="st0">"vegetables"</span><span class="sy0">:</span><span class="br0">[</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"baked potato"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">150</span><span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"broccoli"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">50</span><span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"green beans"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">30</span><span class="br0">}</span></div></li><li class="li1"><div class="de1"> <span class="br0">]</span></div></li><li class="li2"><div class="de2"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> <span class="br0">]</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="st0">"program"</span><span class="sy0">:</span> <span class="br0">[</span></div></li><li class="li1"><div class="de1"> ...</div></li><li class="li1"><div class="de1"> <span class="br0">]</span></div></li><li class="li2"><div class="de2"> <span class="br0">}</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> myDataSource <span class="sy0">=</span> <span class="kw2">new</span> Y.<span class="me1">DataSource</span>.<span class="kw2">Function</span><span class="br0">(</span><span class="br0">{</span>source<span class="sy0">:</span>myFunction<span class="br0">}</span><span class="br0">)</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> myCallback <span class="sy0">=</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> success<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">(</span>e<span class="br0">)</span><span class="br0">{</span></div></li><li class="li2"><div class="de2"> <span class="kw3">alert</span><span class="br0">(</span>e.<span class="me1">response</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> failure<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">(</span>e<span class="br0">)</span><span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw3">alert</span><span class="br0">(</span><span class="st0">"Could not retrieve data: "</span> <span class="sy0">+</span> e.<span class="me1">error</span>.<span class="me1">message</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li2"><div class="de2"> <span class="br0">}</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> myDataSource.<span class="me1">plug</span><span class="br0">(</span>Y.<span class="me1">Plugin</span>.<span class="me1">DataSourceJSONSchema</span><span class="sy0">,</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> schema<span class="sy0">:</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> resultListLocator<span class="sy0">:</span> <span class="st0">"reference[1].fruit"</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2"> resultFields<span class="sy0">:</span> <span class="br0">[</span><span class="st0">"name"</span><span class="sy0">,</span><span class="st0">"calories"</span><span class="br0">]</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> myDataSource.<span class="me1">sendRequest</span><span class="br0">(</span><span class="kw2">null</span><span class="sy0">,</span> myCallback<span class="br0">)</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2"><span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;">YUI<span class="br0">(</span><span class="br0">)</span>.<span class="kw2">use</span><span class="br0">(</span><span class="st0">"datasource-function"</span><span class="sy0">,</span> <span class="st0">"datasource-jsonschema"</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">(</span>Y<span class="br0">)</span> <span class="br0">{</span>
<span class="kw2">var</span> myFunction <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>request<span class="br0">)</span> <span class="br0">{</span>
<span class="kw1">return</span> <span class="br0">{</span>
<span class="st0">"profile"</span><span class="sy0">:</span><span class="br0">{</span>
<span class="st0">"current"</span><span class="sy0">:</span><span class="nu0">160</span><span class="sy0">,</span>
<span class="st0">"target"</span><span class="sy0">:</span><span class="nu0">150</span>
<span class="br0">}</span><span class="sy0">,</span>
<span class="st0">"reference"</span><span class="sy0">:</span> <span class="br0">[</span>
<span class="br0">{</span>
...
<span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span>
<span class="st0">"category"</span><span class="sy0">:</span><span class="st0">"nutrition"</span><span class="sy0">,</span>
<span class="st0">"type"</span><span class="sy0">:</span><span class="st0">"intake"</span><span class="sy0">,</span>
<span class="st0">"fruit"</span><span class="sy0">:</span><span class="br0">[</span>
<span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"apple"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">70</span><span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"banana"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">70</span><span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"orange"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">90</span><span class="br0">}</span><span class="sy0">,</span>
<span class="br0">]</span><span class="sy0">,</span>
<span class="st0">"vegetables"</span><span class="sy0">:</span><span class="br0">[</span>
<span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"baked potato"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">150</span><span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"broccoli"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">50</span><span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span><span class="st0">"name"</span><span class="sy0">:</span><span class="st0">"green beans"</span><span class="sy0">,</span> <span class="st0">"calories"</span><span class="sy0">:</span><span class="nu0">30</span><span class="br0">}</span>
<span class="br0">]</span>
<span class="br0">}</span>
<span class="br0">]</span><span class="sy0">,</span>
<span class="st0">"program"</span><span class="sy0">:</span> <span class="br0">[</span>
...
<span class="br0">]</span>
<span class="br0">}</span><span class="sy0">;</span>
<span class="br0">}</span><span class="sy0">,</span>
myDataSource <span class="sy0">=</span> <span class="kw2">new</span> Y.<span class="me1">DataSource</span>.<span class="kw2">Function</span><span class="br0">(</span><span class="br0">{</span>source<span class="sy0">:</span>myFunction<span class="br0">}</span><span class="br0">)</span><span class="sy0">,</span>
myCallback <span class="sy0">=</span> <span class="br0">{</span>
success<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">(</span>e<span class="br0">)</span><span class="br0">{</span>
<span class="kw3">alert</span><span class="br0">(</span>e.<span class="me1">response</span><span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span><span class="sy0">,</span>
failure<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">(</span>e<span class="br0">)</span><span class="br0">{</span>
<span class="kw3">alert</span><span class="br0">(</span><span class="st0">"Could not retrieve data: "</span> <span class="sy0">+</span> e.<span class="me1">error</span>.<span class="me1">message</span><span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="br0">}</span><span class="sy0">;</span>
myDataSource.<span class="me1">plug</span><span class="br0">(</span>Y.<span class="me1">Plugin</span>.<span class="me1">DataSourceJSONSchema</span><span class="sy0">,</span> <span class="br0">{</span>
schema<span class="sy0">:</span> <span class="br0">{</span>
resultListLocator<span class="sy0">:</span> <span class="st0">"reference[1].fruit"</span><span class="sy0">,</span>
resultFields<span class="sy0">:</span> <span class="br0">[</span><span class="st0">"name"</span><span class="sy0">,</span><span class="st0">"calories"</span><span class="br0">]</span>
<span class="br0">}</span>
<span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span>
myDataSource.<span class="me1">sendRequest</span><span class="br0">(</span><span class="kw2">null</span><span class="sy0">,</span> myCallback<span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span></pre></div><textarea id="syntax2-plain">YUI().use("datasource-function", "datasource-jsonschema", function(Y) {
var myFunction = function(request) {
return {
"profile":{
"current":160,
"target":150
},
"reference": [
{
...
},
{
"category":"nutrition",
"type":"intake",
"fruit":[
{"name":"apple", "calories":70},
{"name":"banana", "calories":70},
{"name":"orange", "calories":90},
],
"vegetables":[
{"name":"baked potato", "calories":150},
{"name":"broccoli", "calories":50},
{"name":"green beans", "calories":30}
]
}
],
"program": [
...
]
};
},
myDataSource = new Y.DataSource.Function({source:myFunction}),
myCallback = {
success: function(e){
alert(e.response);
},
failure: function(e){
alert("Could not retrieve data: " + e.error.message);
}
};
myDataSource.plug(Y.Plugin.DataSourceJSONSchema, {
schema: {
resultListLocator: "reference[1].fruit",
resultFields: ["name","calories"]
}
});
myDataSource.sendRequest(null, myCallback);
});</textarea></div> </div>
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<h4>
DataSource Utility Examples:</h4>
</div>
<div class="bd">
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<li><a href='../datasource/datasource_local.html'>DataSource.Local</a></li><li><a href='../datasource/datasource_get.html'>DataSource.Get</a></li><li><a href='../datasource/datasource_io.html'>DataSource.IO</a></li><li class='selected'><a href='../datasource/datasource_function.html'>DataSource.Function</a></li><li><a href='../datasource/datasource_caching.html'>DataSource with Caching</a></li><li><a href='../datasource/datasource_polling.html'>DataSource with Polling</a></li> </ul>
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<h4>More DataSource Utility Resources:</h4>
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