First version of the newly restructured repository

frontend/beta/js/YUI-extensions/data/JSONDataModel.js

@@ -0,0 +1,81 @@
+
+/**
+ * @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;
+    }
+});