store.js

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 * </code></pre>
     */
    load : function(options){
        options = options || {};
        if(this.fireEvent("beforeload", this, options) !== false){
            this.storeOptions(options);
            var p = Ext.apply(options.params || {}, this.baseParams);
            if(this.sortInfo && this.remoteSort){
                var pn = this.paramNames;
                p[pn["sort"]] = this.sortInfo.field;
                p[pn["dir"]] = this.sortInfo.direction;
            }
            this.proxy.load(p, this.reader, this.loadRecords, this, options);
        }
    },

    /**
     * Reloads the Record cache from the configured Proxy using the configured Reader and
     * the options from the last load operation performed.
     * @param {Object} options (optional) An object containing properties which may override the options
     * used in the last load operation. See {@link #load} for details (defaults to null, in which case
     * the most recently used options are reused).
     */
    reload : function(options){
        this.load(Ext.applyIf(options||{}, this.lastOptions));
    },

    // private
    // Called as a callback by the Reader during a load operation.
    loadRecords : function(o, options, success){
        if(!o || success === false){
            if(success !== false){
                this.fireEvent("load", this, [], options);
            }
            if(options.callback){
                options.callback.call(options.scope || this, [], options, false);
            }
            return;
        }
        var r = o.records, t = o.totalRecords || r.length;
        for(var i = 0, len = r.length; i < len; i++){
            r[i].join(this);
        }
        if(!options || options.add !== true){
            this.data.clear();
            this.data.addAll(r);
            this.totalLength = t;
            this.applySort();
            this.fireEvent("datachanged", this);
        }else{
            this.totalLength = Math.max(t, this.data.length+r.length);
            this.data.addAll(r);
        }
        this.fireEvent("load", this, r, options);
        if(options.callback){
            options.callback.call(options.scope || this, r, options, true);
        }
    },

    /**
     * Loads data from a passed data block. A Reader which understands the format of the data
     * must have been configured in the constructor.
     * @param {Object} data The data block from which to read the Records.  The format of the data expected
     * is dependent on the type of Reader that is configured and should correspond to that Reader's readRecords parameter.
     * @param {Boolean} append (Optional) True to append the new Records rather than replace the existing cache.
     */
    loadData : function(o, append){
        var r = this.reader.readRecords(o);
        this.loadRecords(r, {add: append}, true);
    },

    /**
     * Gets the number of cached records.
     * <p>
     * <em>If using paging, this may not be the total size of the dataset. If the data object
     * used by the Reader contains the dataset size, then the getTotalCount() function returns
     * the data set size</em>
     */
    getCount : function(){
        return this.data.length || 0;
    },

    /**
     * Gets the total number of records in the dataset.
     * <p>
     * <em>If using paging, for this to be accurate, the data object used by the Reader must contain
     * the dataset size</em>
     */
    getTotalCount : function(){
        return this.totalLength || 0;
    },

    /**
     * Returns the sort state of the Store as an object with two properties:
     * <pre><code>
 field {String} The name of the field by which the Records are sorted
 direction {String} The sort order, "ASC" or "DESC"
     * </code></pre>
     */
    getSortState : function(){
        return this.sortInfo;
    },

    // private
    applySort : function(){
        if(this.sortInfo && !this.remoteSort){
            var s = this.sortInfo, f = s.field;
            var st = this.fields.get(f).sortType;
            var fn = function(r1, r2){
                var v1 = st(r1.data[f]), v2 = st(r2.data[f]);
                return v1 > v2 ? 1 : (v1 < v2 ? -1 : 0);
            };
            this.data.sort(s.direction, fn);
            if(this.snapshot && this.snapshot != this.data){
                this.snapshot.sort(s.direction, fn);
            }
        }
    },

    /**
     * Sets the default sort column and order to be used by the next load operation.
     * @param {String} fieldName The name of the field to sort by.
     * @param {String} dir (optional) The sort order, "ASC" or "DESC" (defaults to "ASC")
     */
    setDefaultSort : function(field, dir){
        this.sortInfo = {field: field, direction: dir ? dir.toUpperCase() : "ASC"};
    },

    /**
     * Sort the Records.
     * If remote sorting is used, the sort is performed on the server, and the cache is
     * reloaded. If local sorting is used, the cache is sorted internally.
     * @param {String} fieldName The name of the field to sort by.
     * @param {String} dir (optional) The sort order, "ASC" or "DESC" (defaults to "ASC")
     */
    sort : function(fieldName, dir){
        var f = this.fields.get(fieldName);
        if(!dir){
            if(this.sortInfo && this.sortInfo.field == f.name){ // toggle sort dir
                dir = (this.sortToggle[f.name] || "ASC").toggle("ASC", "DESC");
            }else{
                dir = f.sortDir;
            }
        }
        this.sortToggle[f.name] = dir;
        this.sortInfo = {field: f.name, direction: dir};
        if(!this.remoteSort){
            this.applySort();
            this.fireEvent("datachanged", this);
        }else{
            this.load(this.lastOptions);
        }
    },

    /**
     * Calls the specified function for each of the Records in the cache.
     * @param {Function} fn The function to call. The Record is passed as the first parameter.
     * Returning <em>false</em> aborts and exits the iteration.
     * @param {Object} scope (optional) The scope in which to call the function (defaults to the Record).
     */
    each : function(fn, scope){
        this.data.each(fn, scope);
    },

    /**
     * Get all records modified since the last load, or since the last commit.
     * @return {Ext.data.Record[]} An array of Records containing outstanding modifications.
     */
    getModifiedRecords : function(){
        return this.modified;
    },

    /**
     * Filter the records by a specified property.
     * @param {String} field A field on your records
     * @param {String/RegExp} value Either a string that the field
     * should start with or a RegExp to test against the field
     * @return {Boolean} True if the filter matched at least one record, else false
     */
    filter : function(property, value){
        if(!value.exec){ // not a regex
            value = String(value);
            if(value.length == 0){
                return this.clearFilter();
            }
            value = new RegExp("^" + Ext.escapeRe(value), "i");
        }
        this.filterBy(function(r){
            return value.test(r.data[property]);
        });
    },

    /**
     * Filter by a function. The specified function will be called with each
     * record in this data source. If the function returns true the record is included,
     * otherwise it is filtered.
     * @param {Function} fn The function to be called, it will receive 2 args (record, id)
     * @param {Object} scope (optional) The scope of the function (defaults to this)
     */
    filterBy : function(fn, scope){
        var data = this.snapshot || this.data;
        this.snapshot = data;
        this.data = data.filterBy(fn, scope);
        this.fireEvent("datachanged", this);
    },

    /**
     * Revert to a view of the Record cache with no filtering applied.
     * @param {Boolean} suppressEvent If true the filter is cleared silently without notifying listeners
     */
    clearFilter : function(suppressEvent){
        if(this.snapshot && this.snapshot != this.data){
            this.data = this.snapshot;
            delete this.snapshot;
            if(suppressEvent !== true){
                this.fireEvent("datachanged", this);
            }
        }
    },

    // private
    afterEdit : function(record){
        if(this.modified.indexOf(record) == -1){
            this.modified.push(record);
        }
        this.fireEvent("update", this, record, Ext.data.Record.EDIT);
    },

    // private
    afterReject : function(record){
        this.modified.remove(record);
        this.fireEvent("update", this, record, Ext.data.Record.REJECT);
    },

    // private
    afterCommit : function(record){
        this.modified.remove(record);
        this.fireEvent("update", this, record, Ext.data.Record.COMMIT);
    },

    /**
     * Commit all Records with outstanding changes. To handle updates for changes, subscribe to the
     * Store's "update" event, and perform updating when the third parameter is Ext.data.Record.COMMIT.
     */
    commitChanges : function(){
        var m = this.modified.slice(0);
        this.modified = [];
        for(var i = 0, len = m.length; i < len; i++){
            m[i].commit();
        }
    },

    /**
     * Cancel outstanding changes on all changed records.
     */
    rejectChanges : function(){
        var m = this.modified.slice(0);
        this.modified = [];
        for(var i = 0, len = m.length; i < len; i++){
            m[i].reject();
        }
    }
});