149 lines
2.9 KiB
JavaScript
149 lines
2.9 KiB
JavaScript
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// datasource base class, the "M" in MVC
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// subclass this and override theData to provide your data
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DataSource = new Class(Object, {
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init: function (initialData) {
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if ( DataSource.superClass.init )
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DataSource.superClass.init.apply(this, arguments);
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this.watchers = [];
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this.theData = defined(initialData) ? initialData : [];
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this.sortField = "";
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this.sortType = "";
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this.sortDesc = false;
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},
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addWatcher: function (callback) {
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this.watchers.add(callback);
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},
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removeWatcher: function (callback) {
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this.watchers.remove(callback);
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},
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// call this if updating data and not using _setData
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_updated: function () {
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this.callWatchers();
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},
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callWatchers: function () {
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for (var i = 0; i < this.watchers.length; i++)
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this.watchers[i].apply(this, [this.data()]);
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},
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setData: function (theData) {
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this.theData = theData;
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if (this.sortField)
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this.sortDataBy(this.sortField, this.sortType, this.sortDesc);
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this._setData(theData);
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},
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_setData: function (theData) {
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this.theData = theData;
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this.callWatchers();
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return theData;
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},
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data: function () {
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return this.theData;
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},
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sortBy: function () {
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return this.sortField;
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},
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sortInverted: function () {
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return this.sortDesc;
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},
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// mimic some array functionality
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push: function (data) {
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this.theData.push(data);
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this.callWatchers();
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},
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pop: function () {
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var val = this.theData.pop();
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this.callWatchers();
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return val;
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},
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indexOf: function (value) {
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return this.theData.indexOf(value);
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},
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remove: function (value) {
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this.theData.remove(value);
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this.callWatchers();
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},
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empty: function () {
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this.theData = [];
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this.callWatchers();
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},
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length: function () {
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return this.theData.length;
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},
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totalLength: function () {
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return this.allData().length;
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},
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allData: function () {
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var theData = this.theData;
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if (this.dataField && theData)
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theData = theData[this.dataField];
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return theData;
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},
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sortDataBy: function (field, type, invert) {
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this.sortField = field;
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this.sortDesc = invert;
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this.sortType = type;
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if (!field || !this.theData || !this.theData.sort)
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return;
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var sorted = this.theData.sort(function (a, b) {
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var ad = a[""+field], bd = b[""+field];
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ad = ad ? ad : "";
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bd = bd ? bd : "";
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switch(type) {
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case "string":
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var aname = ad.toUpperCase(), bname = bd.toUpperCase();
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if (aname < bname)
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return -1;
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else if (aname > bname)
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return 1;
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else
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return 0;
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case "isodate":
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var datA = Date.fromISOString(ad) || new Date(0);
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var datB = Date.fromISOString(bd) || new Date(0);
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return ((datA - datB) || 0);
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default:
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case "numeric":
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return ad - bd;
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}
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});
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if (invert)
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sorted.reverse();
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this._setData(sorted);
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}
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});
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