手把手教Extjs-简单GridField示例讲解二

使用的Extjs版本为4.2，示例是官方的版本，对里面的语法进行一句一句的学习研究。可以方便他人，又可以提升自己的理解。里面存在的问题，后期会一步一步改进。也欢迎各位指出。

/*
Extjs具有很庞大的扩展库，
每个扩展的容量都十分大，
通过Loader用于对扩展的动态加载，
实现对扩展组件的即用即取.*/
//通过enabled：true，开启Extjs的动态加载
Ext.Loader.setConfig({enabled: true});
//确定加载地点
Ext.Loader.setPath('Ext.ux', '../ux');
//用到哪些组件,然后就预先加载,多余不用加载的组件
Ext.require([
    'Ext.grid.*',
    'Ext.data.*',
    'Ext.ux.grid.FiltersFeature',
    'Ext.toolbar.Paging',
    'Ext.ux.ajax.JsonSimlet',
    'Ext.ux.ajax.SimManager'
]);

//Extjs自定义一个Product产品类
Ext.define('Product', {
//extend:表明Extjs中类的继承，表明Product继承自Ext.data.Model类
/*详细的内容介绍可以参考https://www.cnblogs.com/youring2/archive/2013/08/22/3274135.html*/
    extend: 'Ext.data.Model',
    fields: [{
        name: 'id',
        type: 'int'
    }, {
        name: 'company'
    }, {
        name: 'price',
        type: 'float'
    }, {
        name: 'date',
        type: 'date',
        dateFormat: 'Y-m-d'
    }, {
        name: 'visible',
        type: 'boolean'
    }, {
        name: 'size'
    }]
});

//类似于js的onready
Ext.onReady(function(){

    Ext.ux.ajax.SimManager.init({
        delay: 300,
        defaultSimlet: null
    }).register({
        'myData': {
            data: [
                ['small', 'small'],
                ['medium', 'medium'],
                ['large', 'large'],
                ['extra large', 'extra large']
            ],
            stype: 'json'
        }
    });

    var optionsStore = Ext.create('Ext.data.Store', {
        fields: ['id', 'text'],
        proxy: {
            type: 'ajax',
            url: 'myData',
            reader: 'array'
        }
    });
//初始化标签中的Ext:Qtip属性。没怎么看明白，之后再回顾
    Ext.QuickTips.init();

    // for this demo configure local and remote urls for demo purposes
    var url = {
        local:  'grid-filter.json',  // static data file
        remote: 'grid-filter.php'
    };

    // configure whether filter query is encoded or not (initially)
    var encode = false;

    // configure whether filtering is performed locally or remotely (initially)
    var local = true;

//创建一个数据仓库
    var store = Ext.create('Ext.data.JsonStore', {
        // store configs
        autoDestroy: true,
        model: 'Product',
//proxy告诉我们从哪里获取数据
        proxy: {
            type: 'ajax',
            url: (local ? url.local : url.remote),
//reader告诉我们如何解析这个数据
            reader: {
                type: 'json',
                root: 'data',
                idProperty: 'id',
                totalProperty: 'total'
            }
        },
        remoteSort: false,
        sorters: [{
            property: 'company',
            direction: 'ASC'
        }],
        pageSize: 50
    });

    var filters = {
        ftype: 'filters',
        encode: encode, // json encode the filter query
        local: local,   // defaults to false (remote filtering)

        // added here.
        filters: [{
            type: 'boolean',
            dataIndex: 'visible'
        }]
    };

    var createColumns = function (finish, start) {

//创建表格中的列的属性
//这里是创建两个列，id，company，price，size
        var columns = [{
            dataIndex: 'id',
            text: 'Id',
            // instead of specifying filter config just specify filterable=true
            // to use store's field's type property (if type property not
            // explicitly specified in store config it will be 'auto' which
            // GridFilters will assume to be 'StringFilter'
            filterable: true,
            width: 30
            //,filter: {type: 'numeric'}
        }, {
            dataIndex: 'company',
            text: 'Company',
            id: 'company',
            flex: 1,
            filter: {
                type: 'string'
                // specify disabled to disable the filter menu
                //, disabled: true
            }
        }, {
            dataIndex: 'price',
            text: 'Price',
            filter: {
                //type: 'numeric'  // specify type here or in store fields config
            },
            width: 70
        }, {
            dataIndex: 'size',
            text: 'Size',
            filter: {
                type: 'list',
                store: optionsStore
                //,phpMode: true
            }
        }, {
            dataIndex: 'date',
            text: 'Date',
            filter: true,
            renderer: Ext.util.Format.dateRenderer('m/d/Y')
        }, {
            dataIndex: 'visible',
            text: 'Visible'
            // this column's filter is defined in the filters feature config
        }];

        return columns.slice(start || 0, finish);
    };

//创建grid图标
    var grid = Ext.create('Ext.grid.Panel', {
        border: false,
        store: store,
//创建表格中的列，里面创建四列
        columns: createColumns(4),
        loadMask: true,
        features: [filters],
        dockedItems: [Ext.create('Ext.toolbar.Paging', {
            dock: 'bottom',
            store: store
        })],
//设置在没有记录的时候表格图标里面该显示什么
        emptyText: 'No Matching Records'
    });

    // add some buttons to bottom toolbar just for demonstration purposes
    grid.child('pagingtoolbar').add([
        '->',
        {
            text: 'Encode: ' + (encode ? 'On' : 'Off'),
            tooltip: 'Toggle Filter encoding on/off',
            enableToggle: true,
            handler: function (button, state) {
                var encode = (grid.filters.encode !== true);
                var text = 'Encode: ' + (encode ? 'On' : 'Off');
                grid.filters.encode = encode;
                grid.filters.reload();
                button.setText(text);
            }
        },
        {
            text: 'Local Filtering: ' + (local ? 'On' : 'Off'),
            tooltip: 'Toggle Filtering between remote/local',
            enableToggle: true,
            handler: function (button, state) {
                var local = (grid.filters.local !== true),
                    text = 'Local Filtering: ' + (local ? 'On' : 'Off'),
                    newUrl = local ? url.local : url.remote,
                    store = grid.view.getStore();

                // update the GridFilter setting
                grid.filters.local = local;
                // bind the store again so GridFilters is listening to appropriate store event
                grid.filters.bindStore(store);
                // update the url for the proxy
                store.proxy.url = newUrl;
                button.setText(text);
                store.load();
            }
        },
        {
            text: 'All Filter Data',
            tooltip: 'Get Filter Data for Grid',
            handler: function () {
                var data = Ext.encode(grid.filters.getFilterData());
                Ext.Msg.alert('All Filter Data',data);
            }
        },{
            text: 'Clear Filter Data',
            handler: function () {
                grid.filters.clearFilters();
            }
        },{
            text: 'Add Columns',
            handler: function () {
                if (grid.headerCt.items.length < 6) {
                    grid.headerCt.add(createColumns(6, 4));
                    grid.view.refresh();
                    this.disable();
                }
            }
        }
    ]);
//创建一个面板，用来存放grid，
    var win = Ext.create('Ext.Window', {
        title: 'Grid Filters Example',
        height: 400,
        width: 875,
        layout: 'fit',
        items: grid
    }).show();

    store.load();
});