Extjs

一切的技术只是为了解决现实的问题，

任何能够帮助我们有效达到目的技术都是值得学习的。

现在让我们一起进入extjs的学习吧！

(What?Why?How?)

1、什么是extjs（What?）

(1)extjs是一种主要用于创建前段用户界面，是一个基本与后台技术无关的前段ajax框架，可以用在.net,java,php等各种开发语言开发的应用中。

(2)extjs最开始是基于YUI技术，由开发人员JackSlocum(杰克.斯洛克姆)开发，UI组件模型和开发理念来自于Yahoo组件库YUI和java平台上是Swing。

(3)最新版为Extjs4.0。2010年6月15日，ExtJS项目已经与触摸屏代码库项目jQTouch和SVG处理库Raphael合并，由Sencha组织维护，此举是ExtJS为了应对HTML5等新趋势，加强丰富图形和触摸屏功能的重要举措。

(4)Exjt收费情况

2、为什么要学习extjs

　Ajax主流框架与ExtJS

JQuery、 Prototype和YUI都属于非常核心的JS库。

ExtJS的定位是RIA，和Prototype、jQuery等类库的定位不同。使用ExtJS做开发，就是意味着以客户端开发为主，不然就不叫RIA框架了，而Prototype、jQuery等只是辅助性的客户端框架，和ExtJS不在同一条起跑先上。

(1)功能丰富，待会儿展示

(2)界面美观，ext的表格控件在各个ajax框架高居榜首

(3)提供最为完整的整合开发平台，绝对可以单独使用。

一系列非常简单易用的控件及组件，就能实现各种丰富多彩的UI的开发

3、怎样学习extjs

(1)理解Html DOM、Ext Element及Component

demo1
/**********************************************/
/*Layout*/

Ext.onReady(function(){

    var border = Ext.create('Ext.window.Window', {
        width: 700,
        height: 500,
        title: 'Border Layout',
        layout: 'border',
        defaults:{
             xtype: 'panel'
        },
        items: [{
            title: 'North Region is resizable',
            region: 'north',     
            height: 100,
            split: true         
        },{
            title: 'South Region is resizable',
            region: 'south',    
            height: 100,
            split: true       
        },{
            title: 'West Region is collapsible',
            region:'west',
            width: 200,
            collapsible: true,   
            layout: 'fit'
        },{
            title: 'East Region is collapsible',
            region:'east',
            width: 200,
            collapsible: true,  
            layout: 'fit'
        },{
            title: 'Center Region',
            region: 'center',    
            layout: 'fit'
        }]
    });
    border.show();
});

demo2
/**********************************************/
/*Store*/

Ext.regModel('Blog', {
            fields: [
                {name: 'id', type: 'int'},
                {name: 'name', type: 'string'},
                {name: 'url', type: 'string'}
            ]
        });

     Ext.onReady(function() {  

         var store = new Ext.data.Store({
                model: 'Blog',
                proxy: {
                    type: 'ajax',
                    url : 'blogs.json',
                    reader: {
                        type: 'json',
                        root: 'blogs'
                    }
                }
            });         

        //Loads the store, which calls our callback function when it has loaded
        //There are 4 records in the JSON response, so this should alert 4:
        store.load(function(records) {
            Ext.MessageBox.alert('Testing Ext 4 Models', "Loaded " + store.getCount() + " records");
        });


     });

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

/*Demo3*/

/*form*/

Ext.require([
    'Ext.form.Panel',
    'Ext.layout.container.Anchor'
]);

Ext.onReady(function(){

    var hboxForm = Ext.create('Ext.form.Panel', {

        frame:true,
        title: 'Form - Ext 4',
        bodyStyle:'padding:5px 5px 0',
        width: 600,
        renderTo:'ext4-form',
        fieldDefaults: {
            labelAlign: 'top',
            msgTarget: 'side'
        },
        defaults: {
            border: false,
            xtype: 'panel',
            flex: 1,
            layout: 'anchor'
        },

        layout: 'hbox',
        items: [{
            items: [{
                xtype:'textfield',
                fieldLabel: 'First Name',
                anchor: '-10',
                name: 'first',
                allowBlank:false
            }, {
                xtype:'textfield',
                fieldLabel: 'Phone Number',
                anchor: '-10',
                name: 'phone',
                allowBlank:false
            }]
        }, {
            items: [{
                xtype:'textfield',
                fieldLabel: 'Last Name',
                anchor: '100%',
                name: 'last',
                allowBlank:false
            },{
                xtype:'textfield',
                fieldLabel: 'Email',
                anchor: '100%',
                name: 'email',
                vtype:'email'
            }]
        }],

        buttons: [{
            text: 'Save'
        },{
            text: 'Cancel'
        }]
    });
});

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

/*demo4 chart*/

/*报表功能*/

Ext.require('Ext.chart.*');
Ext.require(['Ext.Window', 'Ext.fx.target.Sprite', 'Ext.layout.container.Fit']);

Ext.onReady(function () {

    var store = Ext.create('Ext.data.ArrayStore', {
        fields: [
           {name: 'os'},
           {name: 'visits', type: 'int'}
        ],
        data: [
           ['Windows','21548'],
           ['Linux', '19864'],
           ['Mac OS', '18459'],
           ['Android','5762'],
           ['iOS', '5635']
        ]
    });

    var barChart = Ext.create('Ext.chart.Chart', {
        animate: true,
        shadow: true,
        store: store,
        style: 'background:#fff',

        axes: [{
            type: 'Numeric',
            position: 'bottom',
            fields: ['visits'],
            title: 'Number of Visits',
            grid: true,
            minimum: 0
        }, {
            type: 'Category',
            position: 'left',
            fields: ['os'],
            title: 'Operational System'
        }],

        series: [{
            //column:true,
            type: 'bar',
            axis: 'bottom',
            highlight: true,
            tips: {
              trackMouse: true,
              width: 140,
              height: 48,
              renderer: function(storeItem, item) {
                this.setTitle(storeItem.get('os') + ': ' + storeItem.get('visits') + ' visits');
              }
            },
            xField: 'os',
            yField: 'visits'
        }]
    });

    Ext.create('Ext.window.Window', {
        width: 600,
        height: 300,
        hidden: false,
        maximizable: true,
        title: 'Bar Chart',
        renderTo: Ext.getBody(),
        layout: 'fit',
        items: [barChart]
    });
});