Use DataSource.Local to manage retrieval of local data, from JavaScript arrays and objects to DOM elements. A DataSchema plugin is used to normalize incoming data into a known format for consistency of usage by other components.
If you are working with local array data, use the DataSourceArraySchema plugin to normalize and filter the data into a consistent format:
YUI().use("datasource-local", "datasource-arrayschema", function(Y) {
var myData = [
{name:"abc",id:123,extra:"foo"},
{name:"def",id:456,extra:"bar"},
{name:"ghi",id:789,extra:"baz"}
],
myDataSource = new Y.DataSource.Local({source:myData}),
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({callback:myCallback});
});
Use the DataSourceJSONSchema plugin to normalize JSON data:
YUI().use("datasource-local", "datasource-jsonschema", function(Y) {
var myData = {
"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.Local({source:myData}),
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({callback:myCallback});
});
You can use the DataSourceXMLSchema plugin to work with DOM elements:
YUI().use("datasource-local", "datasource-xmlschema", function(Y) {
var myTable = Y.Node.getDOMNode(Y.one("#myTable")),
myDataSource = new Y.DataSource.Local({source:myTable}),
myCallback = {
success: function(e){
alert(e.response);
},
failure: function(e){
alert("Could not retrieve data: " + e.error.message);
}
};
myDataSource.plug(Y.Plugin.DataSourceXMLSchema, {
schema: {
resultListLocator: "tr",
resultFields: [
{key:"beverage", locator:"td[1]"},
{key:"price", locator:"td[2]"}
]
}
});
myDataSource.sendRequest({callback:myCallback});
});