The source code

/** + + + + The source code + + + + +
/*!
+ * Ext JS Library 3.3.1
+ * Copyright(c) 2006-2010 Sencha Inc.
+ * licensing@sencha.com
+ * http://www.sencha.com/license
+ */
+/**
  * @class Ext.data.Field
  * This class encapsulates the field definition information specified in the field definition objects
  * passed to {@link Ext.data.Record#create}.
  * Developers do not need to instantiate this class. Instances are created by {@link Ext.data.Record.create}
  * and cached in the {@link Ext.data.Record#fields fields} property of the created Record constructor's prototype.
  */
-Ext.data.Field = function(config){
-    if(typeof config == "string"){
-        config = {name: config};
-    }
-    Ext.apply(this, config);
-
-    if(!this.type){
-        this.type = "auto";
-    }
-
-    var st = Ext.data.SortTypes;
-    // named sortTypes are supported, here we look them up
-    if(typeof this.sortType == "string"){
-        this.sortType = st[this.sortType];
-    }
-
-    // set default sortType for strings and dates
-    if(!this.sortType){
-        switch(this.type){
-            case "string":
-                this.sortType = st.asUCString;
-                break;
-            case "date":
-                this.sortType = st.asDate;
-                break;
-            default:
-                this.sortType = st.none;
+Ext.data.Field = Ext.extend(Object, {
+    
+    constructor : function(config){
+        if(Ext.isString(config)){
+            config = {name: config};
         }
-    }
+        Ext.apply(this, config);
+        
+        var types = Ext.data.Types,
+            st = this.sortType,
+            t;
 
-    // define once
-    var stripRe = /[\$,%]/g;
-
-    // prebuilt conversion function for this field, instead of
-    // switching every time we're reading a value
-    if(!this.convert){
-        var cv, dateFormat = this.dateFormat;
-        switch(this.type){
-            case "":
-            case "auto":
-            case undefined:
-                cv = function(v){ return v; };
-                break;
-            case "string":
-                cv = function(v){ return (v === undefined || v === null) ? '' : String(v); };
-                break;
-            case "int":
-                cv = function(v){
-                    return v !== undefined && v !== null && v !== '' ?
-                           parseInt(String(v).replace(stripRe, ""), 10) : '';
-                    };
-                break;
-            case "float":
-                cv = function(v){
-                    return v !== undefined && v !== null && v !== '' ?
-                           parseFloat(String(v).replace(stripRe, ""), 10) : '';
-                    };
-                break;
-            case "bool":
-            case "boolean":
-                cv = function(v){ return v === true || v === "true" || v == 1; };
-                break;
-            case "date":
-                cv = function(v){
-                    if(!v){
-                        return '';
-                    }
-                    if(Ext.isDate(v)){
-                        return v;
-                    }
-                    if(dateFormat){
-                        if(dateFormat == "timestamp"){
-                            return new Date(v*1000);
-                        }
-                        if(dateFormat == "time"){
-                            return new Date(parseInt(v, 10));
-                        }
-                        return Date.parseDate(v, dateFormat);
-                    }
-                    var parsed = Date.parse(v);
-                    return parsed ? new Date(parsed) : null;
-                };
-             break;
+        if(this.type){
+            if(Ext.isString(this.type)){
+                this.type = Ext.data.Types[this.type.toUpperCase()] || types.AUTO;
+            }
+        }else{
+            this.type = types.AUTO;
+        }
 
+        // named sortTypes are supported, here we look them up
+        if(Ext.isString(st)){
+            this.sortType = Ext.data.SortTypes[st];
+        }else if(Ext.isEmpty(st)){
+            this.sortType = this.type.sortType;
         }
-        this.convert = cv;
-    }
-};
 
-Ext.data.Field.prototype = {
+        if(!this.convert){
+            this.convert = this.type.convert;
+        }
+    },
+    
     /**
      * @cfg {String} name
      * The name by which the field is referenced within the Record. This is referenced by, for example,
-     * the dataIndex property in column definition objects passed to {@link Ext.grid.ColumnModel}.
-     * Note: In the simplest case, if no properties other than name are required, a field
+     * the dataIndex property in column definition objects passed to {@link Ext.grid.ColumnModel}.
+     * 
Note: In the simplest case, if no properties other than name are required, a field
      * definition may consist of just a String for the field name.
      */
     /**
-     * @cfg {String} type
-     * (Optional) The data type for conversion to displayable value if {@link Ext.data.Field#convert convert}
-     * has not been specified. Possible values are
+     * @cfg {Mixed} type
+     * (Optional) The data type for automatic conversion from received data to the stored value if {@link Ext.data.Field#convert convert}
+     * has not been specified. This may be specified as a string value. Possible values are
      * 
      * auto (Default, implies no conversion)
      * string
@@ -120,13 +69,16 @@ Ext.data.Field.prototype = {
      * float
      * boolean
      * date
+     * This may also be specified by referencing a member of the {@link Ext.data.Types} class.
+     * Developers may create their own application-specific data types by defining new members of the
+     * {@link Ext.data.Types} class.
      */
     /**
      * @cfg {Function} convert
      * (Optional) A function which converts the value provided by the Reader into an object that will be stored
      * in the Record. It is passed the following parameters:
      * v : MixedThe data value as read by the Reader, if undefined will use
-     * the configured {@link Ext.data.Field#defaultValue defaultValue}.
+     * the configured {@link Ext.data.Field#defaultValue defaultValue}.
      * rec : MixedThe data object containing the row as read by the Reader.
      * Depending on the Reader type, this could be an Array ({@link Ext.data.ArrayReader ArrayReader}), an object
      *  ({@link Ext.data.JsonReader JsonReader}), or an XML element ({@link Ext.data.XMLReader XMLReader}).
@@ -155,7 +107,7 @@ var store = new Ext.data.Store({
     reader: new Ext.data.JsonReader(
         {
             idProperty: 'key',
-            root: 'daRoot',  
+            root: 'daRoot',
             totalProperty: 'total'
         },
         Dude  // recordType
@@ -180,15 +132,24 @@ var myData = [
      */
     /**
      * @cfg {String} dateFormat
-     * (Optional) A format string for the {@link Date#parseDate Date.parseDate} function, or "timestamp" if the
+     * (Optional) Used when converting received data into a Date when the {@link #type} is specified as "date".
+     * A format string for the {@link Date#parseDate Date.parseDate} function, or "timestamp" if the
      * value provided by the Reader is a UNIX timestamp, or "time" if the value provided by the Reader is a
-     * javascript millisecond timestamp.
+     * javascript millisecond timestamp. See {@link Date}
      */
     dateFormat: null,
+    
+    /**
+     * @cfg {Boolean} useNull
+     * (Optional) Use when converting received data into a Number type (either int or float). If the value cannot be parsed,
+     * null will be used if useNull is true, otherwise the value will be 0. Defaults to false
+     */
+    useNull: false,
+    
     
/**
      * @cfg {Mixed} defaultValue
      * (Optional) The default value used when a Record is being created by a {@link Ext.data.Reader Reader}
-     * when the item referenced by the {@link Ext.data.Field#mapping mapping} does not exist in the data
+     * when the item referenced by the {@link Ext.data.Field#mapping mapping} does not exist in the data
      * object (i.e. undefined). (defaults to "")
      */
     defaultValue: "",
@@ -236,17 +197,18 @@ sortType: function(value) {
     sortType : null,
     /**
      * @cfg {String} sortDir
-     * (Optional) Initial direction to sort ("ASC" or  "DESC").  Defaults to
-     * "ASC".
+     * (Optional) Initial direction to sort ("ASC" or  "DESC").  Defaults to
+     * "ASC".
      */
     sortDir : "ASC",
-	/**
-	 * @cfg {Boolean} allowBlank 
-	 * (Optional) Used for validating a {@link Ext.data.Record record}, defaults to true.
-	 * An empty value here will cause {@link Ext.data.Record}.{@link Ext.data.Record#isValid isValid}
-	 * to evaluate to false.
-	 */
-	allowBlank : true
-};
- +
/** + * @cfg {Boolean} allowBlank + * (Optional) Used for validating a {@link Ext.data.Record record}, defaults to true. + * An empty value here will cause {@link Ext.data.Record}.{@link Ext.data.Record#isValid isValid} + * to evaluate to false. + */ + allowBlank : true +}); +