中间件编程

开发平台：
JavaScript

classes.js：源码内容
							/*!
 * Ext JS Library 3.0.0
 * Copyright(c) 2006-2009 Ext JS, LLC
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
Ext.BLANK_IMAGE_URL = 'images/s.gif';
    
Task = Ext.data.Record.create([
    {name: 'taskId', type:'string'},
    {name: 'title', type:'string'},
    {name: 'category', type:'string'},
    {name: 'description', type:'string'},
    {name: 'dueDate', type:'date', dateFormat: 'Y-m-d H:i:s'},
    {name: 'completed', type:'boolean'}
]);
Task.nextId = function(){
	// if the time isn't unique enough, the addition 
	// of random chars should be
	var t = String(new Date().getTime()).substr(4);
	var s = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
	for(var i = 0; i < 4; i++){
		t += s.charAt(Math.floor(Math.random()*26));
	}
	return t;
}
// The main grid's store
TaskStore = function(conn){
	TaskStore.superclass.constructor.call(this, {
        sortInfo:{field: 'dueDate', direction: "ASC"},
        groupField:'dueDate',
        taskFilter: 'all',
        reader: new Ext.data.JsonReader({
            idProperty: 'taskId'
        }, Task)
    });
    this.proxy = new Ext.data.SqlDB.Proxy(conn, 'task', 'taskId', this);
    if(window.google){ // google needs the table created
        this.proxy.on('beforeload', this.prepareTable, conn);
    }
    this.addEvents({newcategory: true});
};
Ext.extend(TaskStore, Ext.data.GroupingStore, {
    applyFilter : function(filter){
    	if(filter !== undefined){
    		this.taskFilter = filter;
    	}
        var value = this.taskFilter;
        if(value == 'all'){
            return this.clearFilter();
        }
        return this.filterBy(function(item){
            return item.data.completed === value;
        });
    },
    addTask : function(data){
        this.suspendEvents();
        this.clearFilter();
        this.resumeEvents();
        this.loadData([data], true);
        this.suspendEvents();
        this.applyFilter();
        this.applyGrouping(true);
        this.resumeEvents();
        this.fireEvent('datachanged', this);
        this.fireEvent('newcategory', data.category);
    },
    prepareTable : function(){
        try{
        this.createTable({
            name: 'task',
            key: 'taskId',
            fields: Task.prototype.fields
        });
        }catch(e){console.log(e)}
    }
});
// The store for Categories
CategoryStore = function(){
    CategoryStore.superclass.constructor.call(this, {
        expandData: true,
        data: [],
        fields:[{name: 'text', type:'string'}],
        sortInfo:{field:'text', direction:'ASC'},
        id: 0
    });
}
Ext.extend(CategoryStore, Ext.data.ArrayStore, {
    init : function(store){
        var cats = store.collect('category', false, true);
        this.loadData(cats);
    },
    addCategory : function(cat){
        if(cat && this.indexOfId(cat) === -1){
            this.clearFilter(true);
            this.loadData([cat], true);
            this.applySort();
        }
    }
});
// Grid column plugin that does the complete/active button in the left-most column
CompleteColumn = function(){
    var grid;
    function getRecord(t){
        var index = grid.getView().findRowIndex(t);
        return grid.store.getAt(index);
    }
    function onMouseDown(e, t){
        if(Ext.fly(t).hasClass('task-check')){
            e.stopEvent();
            var record = getRecord(t);
            record.set('completed', !record.data.completed);
            grid.store.applyFilter();
        }
    }
    function onMouseOver(e, t){
        if(Ext.fly(t).hasClass('task-check')){
            Ext.fly(t.parentNode).addClass('task-check-over');
        }
    }
    function onMouseOut(e, t){
        if(Ext.fly(t).hasClass('task-check')){
            Ext.fly(t.parentNode).removeClass('task-check-over');
        }
    }
    Ext.apply(this, {
        width: 22,
        header: '<div class="task-col-hd"></div>',
        menuDisabled:true,
        fixed: true,
        id: 'task-col',
        renderer: function(){
            return '<div class="task-check"></div>';
        },
        init : function(xg){
            grid = xg;
            grid.on('render', function(){
                var view = grid.getView();
                view.mainBody.on('mousedown', onMouseDown);
                view.mainBody.on('mouseover', onMouseOver);
                view.mainBody.on('mouseout', onMouseOut);
            });
        }
    });
};

						