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/**
* @class YAHOO.ext.grid.JSONDataModel
* This is an implementation of a DataModel used by the Grid. It works
* with JSON data.
* <br>Example schema:
* <pre><code>
* var schema = {
* root: 'Results.Result',
* id: 'ASIN',
* fields: ['Author', 'Title', 'Manufacturer', 'ProductGroup']
* };
* </code></pre>
* @extends YAHOO.ext.grid.LoadableDataModel
* @constructor
*/
YAHOO.ext.grid.JSONDataModel = function(schema){
YAHOO.ext.grid.JSONDataModel.superclass.constructor.call(this, YAHOO.ext.grid.LoadableDataModel.JSON);
/**@private*/
this.schema = schema;
};
YAHOO.extendX(YAHOO.ext.grid.JSONDataModel, YAHOO.ext.grid.LoadableDataModel, {
/**
* Overrides loadData in LoadableDataModel to process JSON data
* @param {Object} data The JSON object to load
* @param {Function} callback
*/
loadData : function(data, callback, keepExisting){
var idField = this.schema.id;
var fields = this.schema.fields;
try{
if(this.schema.totalProperty){
var v = parseInt(eval('data.' + this.schema.totalProperty), 10);
if(!isNaN(v)){
this.totalCount = v;
}
}
var rowData = [];
var root = eval('data.' + this.schema.root);
for(var i = 0; i < root.length; i++){
var node = root[i];
var colData = [];
colData.node = node;
colData.id = (typeof node[idField] != 'undefined' && node[idField] !== '' ? node[idField] : String(i));
for(var j = 0; j < fields.length; j++) {
var val = node[fields[j]];
if(typeof val == 'undefined'){
val = '';
}
if(this.preprocessors[j]){
val = this.preprocessors[j](val);
}
colData.push(val);
}
rowData.push(colData);
}
if(keepExisting !== true){
this.removeAll();
}
this.addRows(rowData);
if(typeof callback == 'function'){
callback(this, true);
}
this.fireLoadEvent();
}catch(e){
this.fireLoadException(e, null);
if(typeof callback == 'function'){
callback(this, false);
}
}
},
/**
* Overrides getRowId in DefaultDataModel to return the ID value of the specified node.
* @param {Number} rowIndex
* @return {Number}
*/
getRowId : function(rowIndex){
return this.data[rowIndex].id;
}
});
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