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