Extjs4布局详解(一)——Fit布局

在Fit布局中，子元素将自动填满整个父容器。注意：在fit布局下，对其子元素设置宽度是无效的。如果在fit布局中放置了多个组件，则只会显示第一个子元素。典型的案例就是当客户要求一个window或panel中放置一个GRID组件，grid组件的大小会随着父容器的大小改变而改变。

示例代码：

 

var myData = [        ['3m Co',                               71.72, 0.02,  0.03,  '9/1 12:00am'],        ['Alcoa Inc',                           29.01, 0.42,  1.47,  '9/1 12:00am'],        ['Altria Group Inc',                    83.81, 0.28,  0.34,  '9/1 12:00am'],        ['American Express Company',            52.55, 0.01,  0.02,  '9/1 12:00am'],        ['American International Group, Inc.',  64.13, 0.31,  0.49,  '9/1 12:00am'],        ['AT&T Inc.',                           31.61, -0.48, -1.54, '9/1 12:00am'],        ['Boeing Co.',                          75.43, 0.53,  0.71,  '9/1 12:00am'],        ['Caterpillar Inc.',                    67.27, 0.92,  1.39,  '9/1 12:00am'],        ['Citigroup, Inc.',                     49.37, 0.02,  0.04,  '9/1 12:00am'],        ['E.I. du Pont de Nemours and Company', 40.48, 0.51,  1.28,  '9/1 12:00am'],        ['Exxon Mobil Corp',                    68.1,  -0.43, -0.64, '9/1 12:00am'],        ['General Electric Company',            34.14, -0.08, -0.23, '9/1 12:00am'],        ['General Motors Corporation',          30.27, 1.09,  3.74,  '9/1 12:00am'],        ['Hewlett-Packard Co.',                 36.53, -0.03, -0.08, '9/1 12:00am'],        ['Honeywell Intl Inc',                  38.77, 0.05,  0.13,  '9/1 12:00am'],        ['Intel Corporation',                   19.88, 0.31,  1.58,  '9/1 12:00am'],        ['International Business Machines',     81.41, 0.44,  0.54,  '9/1 12:00am'],        ['Johnson & Johnson',                   64.72, 0.06,  0.09,  '9/1 12:00am'],        ['JP Morgan & Chase & Co',              45.73, 0.07,  0.15,  '9/1 12:00am'],        ['McDonald\'s Corporation',             36.76, 0.86,  2.40,  '9/1 12:00am'],        ['Merck & Co., Inc.',                   40.96, 0.41,  1.01,  '9/1 12:00am'],        ['Microsoft Corporation',               25.84, 0.14,  0.54,  '9/1 12:00am'],        ['Pfizer Inc',                          27.96, 0.4,   1.45,  '9/1 12:00am'],        ['The Coca-Cola Company',               45.07, 0.26,  0.58,  '9/1 12:00am'],        ['The Home Depot, Inc.',                34.64, 0.35,  1.02,  '9/1 12:00am'],        ['The Procter & Gamble Company',        61.91, 0.01,  0.02,  '9/1 12:00am'],        ['United Technologies Corporation',     63.26, 0.55,  0.88,  '9/1 12:00am'],        ['Verizon Communications',              35.57, 0.39,  1.11,  '9/1 12:00am'],        ['Wal-Mart Stores, Inc.',               45.45, 0.73,  1.63,  '9/1 12:00am']    ];var store = Ext.create('Ext.data.ArrayStore', {fields: [   {name: 'company'},   {name: 'price',      type: 'float'},   {name: 'change',     type: 'float'},   {name: 'pctChange',  type: 'float'},   {name: 'lastChange', type: 'date', dateFormat: 'n/j h:ia'}],data: myData});Ext.define('DataWindow',{extend : 'Ext.window.Window',title : 'MHZG.NET---Fit布局示例代码',width:550,layout : 'fit',items : {xtype : 'gridpanel',store: store,   columns: [   {   text     : 'Company',   flex     : 1,   sortable : false,   dataIndex: 'company'   },   {   text     : 'Price',   width    : 75,   sortable : true,   renderer : 'usMoney',   dataIndex: 'price'   },   {   text     : 'Change',   width    : 75,   sortable : true,   dataIndex: 'change'   },   {   text     : '% Change',   width    : 75,   sortable : true,     dataIndex: 'pctChange'   },   {   text     : 'Last Updated',   width    : 85,   sortable : true,   renderer : Ext.util.Format.dateRenderer('m/d/Y'),   dataIndex: 'lastChange'   }]}});Ext.onReady(function(){var win = Ext.create("DataWindow",{x:10,y:20,});});