API: datatable RecordSet.js (YUI Library)

# Yahoo! UI Library

### DataTable Widget 2.8.1

Yahoo! UI Library > datatable > RecordSet.js (source view)
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    (function () {

    var lang   = YAHOO.lang,
        util   = YAHOO.util,
        widget = YAHOO.widget,

        Dom    = util.Dom,
        Ev     = util.Event,
        DT     = widget.DataTable;

    /****************************************************************************/
    /****************************************************************************/
    /****************************************************************************/

    /**
     * A RecordSet defines and manages a set of Records.
     *
     * @namespace YAHOO.widget
     * @class RecordSet
     * @param data {Object || Object[]} An object literal or an array of data.
     * @constructor
     */
    YAHOO.widget.RecordSet = function(data) {
        // Internal variables
        this._sId = "yui-rs" + widget.RecordSet._nCount;
        widget.RecordSet._nCount++;
        this._records = [];
        //this._length = 0;

        if(data) {
            if(lang.isArray(data)) {
                this.addRecords(data);
            }
            else if(lang.isObject(data)) {
                this.addRecord(data);
            }
        }

        YAHOO.log("RecordSet initialized", "info", this.toString());
    };

    var RS = widget.RecordSet;

    /**
     * Internal class variable to name multiple Recordset instances.
     *
     * @property RecordSet._nCount
     * @type Number
     * @private
     * @static
     */
    RS._nCount = 0;

    RS.prototype = {

        /////////////////////////////////////////////////////////////////////////////
        //
        // Private member variables
        //
        /////////////////////////////////////////////////////////////////////////////
        /**
         * Unique String identifier assigned at instantiation.
         *
         * @property _sId
         * @type String
         * @private
         */
        _sId : null,

        /**
         * Internal counter of how many Records are in the RecordSet.
         *
         * @property _length
         * @type Number
         * @private
         * @deprecated No longer used
         */
        //_length : null,

        /////////////////////////////////////////////////////////////////////////////
        //
        // Private methods
        //
        /////////////////////////////////////////////////////////////////////////////

        /**
         * Adds one Record to the RecordSet at the given index. If index is null,
         * then adds the Record to the end of the RecordSet.
         *
         * @method _addRecord
         * @param oData {Object} An object literal of data.
         * @param index {Number} (optional) Position index.
         * @return {YAHOO.widget.Record} A Record instance.
         * @private
         */
        _addRecord : function(oData, index) {
            var oRecord = new YAHOO.widget.Record(oData);

            if(YAHOO.lang.isNumber(index) && (index > -1)) {
                this._records.splice(index,0,oRecord);
            }
            else {
                //index = this.getLength();
                //this._records[index] = oRecord;
                this._records[this._records.length] = oRecord;
            }
            //this._length++;
            return oRecord;
        },

        /**
         * Sets/replaces one Record to the RecordSet at the given index.  Existing
         * Records with higher indexes are not shifted.  If no index specified, the
         * Record is added to the end of the RecordSet.
         *
         * @method _setRecord
         * @param oData {Object} An object literal of data.
         * @param index {Number} (optional) Position index.
         * @return {YAHOO.widget.Record} A Record instance.
         * @private
         */
        _setRecord : function(oData, index) {
            if (!lang.isNumber(index) || index < 0) {
                index = this._records.length;
            }
            return (this._records[index] = new widget.Record(oData));
            /*
            if(lang.isNumber(index) && (index > -1)) {
                this._records[index] = oRecord;
                if((index+1) > this.getLength()) {
                    this._length = index+1;
                }
            }
            else {
                this._records[this.getLength()] = oRecord;
                this._length++;
            }
            return oRecord;
            */
        },

        /**
         * Deletes Records from the RecordSet at the given index. If range is null,
         * then only one Record is deleted.
         *
         * @method _deleteRecord
         * @param index {Number} Position index.
         * @param range {Number} (optional) How many Records to delete
         * @private
         */
        _deleteRecord : function(index, range) {
            if(!lang.isNumber(range) || (range < 0)) {
                range = 1;
            }
            this._records.splice(index, range);
            //this._length = this._length - range;
        },

        /////////////////////////////////////////////////////////////////////////////
        //
        // Public methods
        //
        /////////////////////////////////////////////////////////////////////////////

        /**
         * Returns unique name of the RecordSet instance.
         *
         * @method getId
         * @return {String} Unique name of the RecordSet instance.
         */
        getId : function() {
            return this._sId;
        },

        /**
         * Public accessor to the unique name of the RecordSet instance.
         *
         * @method toString
         * @return {String} Unique name of the RecordSet instance.
         */
        toString : function() {
            return "RecordSet instance " + this._sId;
        },

        /**
         * Returns the number of Records held in the RecordSet.
         *
         * @method getLength
         * @return {Number} Number of records in the RecordSet.
         */
        getLength : function() {
                //return this._length;
                return this._records.length;
        },

        /**
         * Returns Record by ID or RecordSet position index.
         *
         * @method getRecord
         * @param record {YAHOO.widget.Record | Number | String} Record instance,
         * RecordSet position index, or Record ID.
         * @return {YAHOO.widget.Record} Record object.
         */
        getRecord : function(record) {
            var i;
            if(record instanceof widget.Record) {
                for(i=0; i<this._records.length; i++) {
                    if(this._records[i] && (this._records[i]._sId === record._sId)) {
                        return record;
                    }
                }
            }
            else if(lang.isNumber(record)) {
                if((record > -1) && (record < this.getLength())) {
                    return this._records[record];
                }
            }
            else if(lang.isString(record)) {
                for(i=0; i<this._records.length; i++) {
                    if(this._records[i] && (this._records[i]._sId === record)) {
                        return this._records[i];
                    }
                }
            }
            // Not a valid Record for this RecordSet
            return null;

        },

        /**
         * Returns an array of Records from the RecordSet.
         *
         * @method getRecords
         * @param index {Number} (optional) Recordset position index of which Record to
         * start at.
         * @param range {Number} (optional) Number of Records to get.
         * @return {YAHOO.widget.Record[]} Array of Records starting at given index and
         * length equal to given range. If index is not given, all Records are returned.
         */
        getRecords : function(index, range) {
            if(!lang.isNumber(index)) {
                return this._records;
            }
            if(!lang.isNumber(range)) {
                return this._records.slice(index);
            }
            return this._records.slice(index, index+range);
        },

        /**
         * Returns a boolean indicating whether Records exist in the RecordSet at the
         * specified index range.  Returns true if and only if a Record exists at each
         * index in the range.
         * @method hasRecords
         * @param index
         * @param range
         * @return {Boolean} true if all indices are populated in the RecordSet
         */
        hasRecords : function (index, range) {
            var recs = this.getRecords(index,range);
            for (var i = 0; i < range; ++i) {
                if (typeof recs[i] === 'undefined') {
                    return false;
                }
            }
            return true;
        },

        /**
         * Returns current position index for the given Record.
         *
         * @method getRecordIndex
         * @param oRecord {YAHOO.widget.Record} Record instance.
         * @return {Number} Record's RecordSet position index.
         */

        getRecordIndex : function(oRecord) {
            if(oRecord) {
                for(var i=this._records.length-1; i>-1; i--) {
                    if(this._records[i] && oRecord.getId() === this._records[i].getId()) {
                        return i;
                    }
                }
            }
            return null;

        },

        /**
         * Adds one Record to the RecordSet at the given index. If index is null,
         * then adds the Record to the end of the RecordSet.
         *
         * @method addRecord
         * @param oData {Object} An object literal of data.
         * @param index {Number} (optional) Position index.
         * @return {YAHOO.widget.Record} A Record instance.
         */
        addRecord : function(oData, index) {
            if(lang.isObject(oData)) {
                var oRecord = this._addRecord(oData, index);
                this.fireEvent("recordAddEvent",{record:oRecord,data:oData});
                YAHOO.log("Added Record at index " + index +
                        " with data " + lang.dump(oData), "info", this.toString());
                return oRecord;
            }
            else {
                YAHOO.log("Could not add Record with data" +
                        lang.dump(oData), "info", this.toString());
                return null;
            }
        },

        /**
         * Adds multiple Records at once to the RecordSet at the given index with the
         * given object literal data. If index is null, then the new Records are
         * added to the end of the RecordSet.
         *
         * @method addRecords
         * @param aData {Object[]} An object literal data or an array of data object literals.
         * @param index {Number} (optional) Position index.
         * @return {YAHOO.widget.Record[]} An array of Record instances.
         */
        addRecords : function(aData, index) {
            if(lang.isArray(aData)) {
                var newRecords = [],
                    idx,i,len;

                index = lang.isNumber(index) ? index : this._records.length;
                idx = index;

                // Can't go backwards bc we need to preserve order
                for(i=0,len=aData.length; i<len; ++i) {
                    if(lang.isObject(aData[i])) {
                        var record = this._addRecord(aData[i], idx++);
                        newRecords.push(record);
                    }
               }
                this.fireEvent("recordsAddEvent",{records:newRecords,data:aData});
                YAHOO.log("Added " + newRecords.length + " Record(s) at index " + index +
                        " with data " + lang.dump(aData), "info", this.toString());
               return newRecords;
            }
            else if(lang.isObject(aData)) {
                var oRecord = this._addRecord(aData);
                this.fireEvent("recordsAddEvent",{records:[oRecord],data:aData});
                YAHOO.log("Added 1 Record at index " + index +
                        " with data " + lang.dump(aData), "info", this.toString());
                return oRecord;
            }
            else {
                YAHOO.log("Could not add Records with data " +
                        lang.dump(aData), "info", this.toString());
                return null;
            }
        },

        /**
         * Sets or replaces one Record to the RecordSet at the given index. Unlike
         * addRecord, an existing Record at that index is not shifted to preserve it.
         * If no index is specified, it adds the Record to the end of the RecordSet.
         *
         * @method setRecord
         * @param oData {Object} An object literal of data.
         * @param index {Number} (optional) Position index.
         * @return {YAHOO.widget.Record} A Record instance.
         */
        setRecord : function(oData, index) {
            if(lang.isObject(oData)) {
                var oRecord = this._setRecord(oData, index);
                this.fireEvent("recordSetEvent",{record:oRecord,data:oData});
                YAHOO.log("Set Record at index " + index +
                        " with data " + lang.dump(oData), "info", this.toString());
                return oRecord;
            }
            else {
                YAHOO.log("Could not set Record with data" +
                        lang.dump(oData), "info", this.toString());
                return null;
            }
        },

        /**
         * Sets or replaces multiple Records at once to the RecordSet with the given
         * data, starting at the given index. If index is not specified, then the new
         * Records are added to the end of the RecordSet.
         *
         * @method setRecords
         * @param aData {Object[]} An array of object literal data.
         * @param index {Number} (optional) Position index.
         * @return {YAHOO.widget.Record[]} An array of Record instances.
         */
        setRecords : function(aData, index) {
            var Rec   = widget.Record,
                a     = lang.isArray(aData) ? aData : [aData],
                added = [],
                i = 0, l = a.length, j = 0;

            index = parseInt(index,10)|0;

            for(; i < l; ++i) {
                if (typeof a[i] === 'object' && a[i]) {
                    added[j++] = this._records[index + i] = new Rec(a[i]);
                }
            }

            this.fireEvent("recordsSetEvent",{records:added,data:aData});
            // Backward compatibility for bug 1918245
            this.fireEvent("recordsSet",{records:added,data:aData});
            YAHOO.log("Set "+j+" Record(s) at index "+index, "info",
                      this.toString());

            if (a.length && !added.length) {
                YAHOO.log("Could not set Records with data " +
                        lang.dump(aData), "info", this.toString());
            }

            return added.length > 1 ? added : added[0];
        },

        /**
         * Updates given Record with given data.
         *
         * @method updateRecord
         * @param record {YAHOO.widget.Record | Number | String} A Record instance,
         * a RecordSet position index, or a Record ID.
         * @param oData {Object} Object literal of new data.
         * @return {YAHOO.widget.Record} Updated Record, or null.
         */
        updateRecord : function(record, oData) {
            var oRecord = this.getRecord(record);
            if(oRecord && lang.isObject(oData)) {
                // Copy data from the Record for the event that gets fired later
                var oldData = {};
                for(var key in oRecord._oData) {
                    if(lang.hasOwnProperty(oRecord._oData, key)) {
                        oldData[key] = oRecord._oData[key];
                    }
                }
                oRecord._oData = oData;
                this.fireEvent("recordUpdateEvent",{record:oRecord,newData:oData,oldData:oldData});
                YAHOO.log("Record at index " + this.getRecordIndex(oRecord) +
                        " updated with data " + lang.dump(oData), "info", this.toString());
                return oRecord;
            }
            else {
                YAHOO.log("Could not update Record " + record, "error", this.toString());
                return null;
            }
        },

        /**
         * @method updateKey
         * @deprecated Use updateRecordValue
         */
        updateKey : function(record, sKey, oData) {
            this.updateRecordValue(record, sKey, oData);
        },
        /**
         * Sets given Record at given key to given data.
         *
         * @method updateRecordValue
         * @param record {YAHOO.widget.Record | Number | String} A Record instance,
         * a RecordSet position index, or a Record ID.
         * @param sKey {String} Key name.
         * @param oData {Object} New data.
         */
        updateRecordValue : function(record, sKey, oData) {
            var oRecord = this.getRecord(record);
            if(oRecord) {
                var oldData = null;
                var keyValue = oRecord._oData[sKey];
                // Copy data from the Record for the event that gets fired later
                if(keyValue && lang.isObject(keyValue)) {
                    oldData = {};
                    for(var key in keyValue)  {
                        if(lang.hasOwnProperty(keyValue, key)) {
                            oldData[key] = keyValue[key];
                        }
                    }
                }
                // Copy by value
                else {
                    oldData = keyValue;
                }

                oRecord._oData[sKey] = oData;
                this.fireEvent("keyUpdateEvent",{record:oRecord,key:sKey,newData:oData,oldData:oldData});
                this.fireEvent("recordValueUpdateEvent",{record:oRecord,key:sKey,newData:oData,oldData:oldData});
                YAHOO.log("Key \"" + sKey +
                        "\" for Record at index " + this.getRecordIndex(oRecord) +
                        " updated to \"" + lang.dump(oData) + "\"", "info", this.toString());
            }
            else {
                YAHOO.log("Could not update key " + sKey + " for Record " + record, "error", this.toString());
            }
        },

        /**
         * Replaces all Records in RecordSet with new object literal data.
         *
         * @method replaceRecords
         * @param data {Object || Object[]} An object literal of data or an array of
         * data object literals.
         * @return {YAHOO.widget.Record || YAHOO.widget.Record[]} A Record instance or
         * an array of Records.
         */
        replaceRecords : function(data) {
            this.reset();
            return this.addRecords(data);
        },

        /**
         * Sorts all Records by given function. Records keep their unique IDs but will
         * have new RecordSet position indexes.
         *
         * @method sortRecords
         * @param fnSort {Function} Reference to a sort function.
         * @param desc {Boolean} True if sort direction is descending, false if sort
         * direction is ascending.
         * @param field {String} The field to sort by, from sortOptions.field
         * @return {YAHOO.widget.Record[]} Sorted array of Records.
         */
        sortRecords : function(fnSort, desc, field) {
            return this._records.sort(function(a, b) {return fnSort(a, b, desc, field);});
        },

        /**
         * Reverses all Records, so ["one", "two", "three"] becomes ["three", "two", "one"].
         *
         * @method reverseRecords
         * @return {YAHOO.widget.Record[]} Reverse-sorted array of Records.
         */
        reverseRecords : function() {
            return this._records.reverse();
        },

        /**
         * Removes the Record at the given position index from the RecordSet. If a range
         * is also provided, removes that many Records, starting from the index. Length
         * of RecordSet is correspondingly shortened.
         *
         * @method deleteRecord
         * @param index {Number} Record's RecordSet position index.
         * @param range {Number} (optional) How many Records to delete.
         * @return {Object} A copy of the data held by the deleted Record.
         */
        deleteRecord : function(index) {
            if(lang.isNumber(index) && (index > -1) && (index < this.getLength())) {
                // Copy data from the Record for the event that gets fired later
                var oData = widget.DataTable._cloneObject(this.getRecord(index).getData());

                this._deleteRecord(index);
                this.fireEvent("recordDeleteEvent",{data:oData,index:index});
                YAHOO.log("Record deleted at index " + index +
                        " and containing data " + lang.dump(oData), "info", this.toString());
                return oData;
            }
            else {
                YAHOO.log("Could not delete Record at index " + index, "error", this.toString());
                return null;
            }
        },

        /**
         * Removes the Record at the given position index from the RecordSet. If a range
         * is also provided, removes that many Records, starting from the index. Length
         * of RecordSet is correspondingly shortened.
         *
         * @method deleteRecords
         * @param index {Number} Record's RecordSet position index.
         * @param range {Number} (optional) How many Records to delete.
         * @return {Object[]} An array of copies of the data held by the deleted Records.
         */
        deleteRecords : function(index, range) {
            if(!lang.isNumber(range)) {
                range = 1;
            }
            if(lang.isNumber(index) && (index > -1) && (index < this.getLength())) {
                var recordsToDelete = this.getRecords(index, range);
                // Copy data from each Record for the event that gets fired later
                var deletedData = [];

                for(var i=0; i<recordsToDelete.length; i++) {
                    deletedData[deletedData.length] = widget.DataTable._cloneObject(recordsToDelete[i]);
                }
                this._deleteRecord(index, range);

                this.fireEvent("recordsDeleteEvent",{data:deletedData,index:index});
                YAHOO.log(range + "Record(s) deleted at index " + index +
                        " and containing data " + lang.dump(deletedData), "info", this.toString());

                return deletedData;
            }
            else {
                YAHOO.log("Could not delete Records at index " + index, "error", this.toString());
                return null;
            }
        },

        /**
         * Deletes all Records from the RecordSet.
         *
         * @method reset
         */
        reset : function() {
            this._records = [];
            //this._length = 0;
            this.fireEvent("resetEvent");
            YAHOO.log("All Records deleted from RecordSet", "info", this.toString());
        }
    };

    /////////////////////////////////////////////////////////////////////////////
    //
    // Custom Events
    //
    /////////////////////////////////////////////////////////////////////////////

    // RecordSet uses EventProvider
    lang.augmentProto(RS, util.EventProvider);

    /**
     * Fired when a new Record is added to the RecordSet.
     *
     * @event recordAddEvent
     * @param oArgs.record {YAHOO.widget.Record} The Record instance.
     * @param oArgs.data {Object} Data added.
     */

    /**
     * Fired when multiple Records are added to the RecordSet at once.
     *
     * @event recordsAddEvent
     * @param oArgs.records {YAHOO.widget.Record[]} An array of Record instances.
     * @param oArgs.data {Object[]} Data added.
     */

    /**
     * Fired when a Record is set in the RecordSet.
     *
     * @event recordSetEvent
     * @param oArgs.record {YAHOO.widget.Record} The Record instance.
     * @param oArgs.data {Object} Data added.
     */

    /**
     * Fired when multiple Records are set in the RecordSet at once.
     *
     * @event recordsSetEvent
     * @param oArgs.records {YAHOO.widget.Record[]} An array of Record instances.
     * @param oArgs.data {Object[]} Data added.
     */

    /**
     * Fired when a Record is updated with new data.
     *
     * @event recordUpdateEvent
     * @param oArgs.record {YAHOO.widget.Record} The Record instance.
     * @param oArgs.newData {Object} New data.
     * @param oArgs.oldData {Object} Old data.
     */

    /**
     * Fired when a Record is deleted from the RecordSet.
     *
     * @event recordDeleteEvent
     * @param oArgs.data {Object} A copy of the data held by the Record,
     * or an array of data object literals if multiple Records were deleted at once.
     * @param oArgs.index {Object} Index of the deleted Record.
     */

    /**
     * Fired when multiple Records are deleted from the RecordSet at once.
     *
     * @event recordsDeleteEvent
     * @param oArgs.data {Object[]} An array of data object literals copied
     * from the Records.
     * @param oArgs.index {Object} Index of the first deleted Record.
     */

    /**
     * Fired when all Records are deleted from the RecordSet at once.
     *
     * @event resetEvent
     */

    /**
     * @event keyUpdateEvent
     * @deprecated Use recordValueUpdateEvent
     */

    /**
     * Fired when a Record value is updated with new data.
     *
     * @event recordValueUpdateEvent
     * @param oArgs.record {YAHOO.widget.Record} The Record instance.
     * @param oArgs.key {String} The updated key.
     * @param oArgs.newData {Object} New data.
     * @param oArgs.oldData {Object} Old data.
     *
     */

    /****************************************************************************/
    /****************************************************************************/
    /****************************************************************************/

    /**
     * The Record class defines a DataTable record.
     *
     * @namespace YAHOO.widget
     * @class Record
     * @constructor
     * @param oConfigs {Object} (optional) Object literal of key/value pairs.
     */
    YAHOO.widget.Record = function(oLiteral) {
        this._nCount = widget.Record._nCount;
        this._sId = "yui-rec" + this._nCount;
        widget.Record._nCount++;
        this._oData = {};
        if(lang.isObject(oLiteral)) {
            for(var sKey in oLiteral) {
                if(lang.hasOwnProperty(oLiteral, sKey)) {
                    this._oData[sKey] = oLiteral[sKey];
                }
            }
        }
    };

    /////////////////////////////////////////////////////////////////////////////
    //
    // Private member variables
    //
    /////////////////////////////////////////////////////////////////////////////

    /**
     * Internal class variable to give unique IDs to Record instances.
     *
     * @property Record._nCount
     * @type Number
     * @private
     */
    YAHOO.widget.Record._nCount = 0;

    YAHOO.widget.Record.prototype = {
        /**
         * Immutable unique count assigned at instantiation. Remains constant while a
         * Record's position index can change from sorting.
         *
         * @property _nCount
         * @type Number
         * @private
         */
        _nCount : null,

        /**
         * Immutable unique ID assigned at instantiation. Remains constant while a
         * Record's position index can change from sorting.
         *
         * @property _sId
         * @type String
         * @private
         */
        _sId : null,

        /**
         * Holds data for the Record in an object literal.
         *
         * @property _oData
         * @type Object
         * @private
         */
        _oData : null,

        /////////////////////////////////////////////////////////////////////////////
        //
        // Public member variables
        //
        /////////////////////////////////////////////////////////////////////////////

        /////////////////////////////////////////////////////////////////////////////
        //
        // Public methods
        //
        /////////////////////////////////////////////////////////////////////////////

        /**
         * Returns unique count assigned at instantiation.
         *
         * @method getCount
         * @return Number
         */
        getCount : function() {
            return this._nCount;
        },

        /**
         * Returns unique ID assigned at instantiation.
         *
         * @method getId
         * @return String
         */
        getId : function() {
            return this._sId;
        },

        /**
         * Returns data for the Record for a field if given, or the entire object
         * literal otherwise.
         *
         * @method getData
         * @param sField {String} (Optional) The field from which to retrieve data value.
         * @return Object
         */
        getData : function(sField) {
            if(lang.isString(sField)) {
                return this._oData[sField];
            }
            else {
                return this._oData;
            }
        },

        /**
         * Sets given data at the given key. Use the RecordSet method updateRecordValue to trigger
         * events.
         *
         * @method setData
         * @param sKey {String} The key of the new value.
         * @param oData {MIXED} The new value.
         */
        setData : function(sKey, oData) {
            this._oData[sKey] = oData;
        }
    };

    })();

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