??? 最近由于公司项目前端人员紧缺，也有幸的被从java开发转到Web端开发，并使用ext这个最流行的AJAX框架。对于前段时间的学习，今天领导叫做一个项目的主界面，经过讨论，界面的主要布局直接用extjs提供的布局borderLayout，而Ext提供的布局经常跟Viewport容器结合起来用
? Viewport不需要指定renderTo，因为它直接渲染到body ，所以在一个页面中只能有一个Viewport,下面给出Viewport的例子：
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new Ext.Viewport({
layout: 'border',
items: [{
region: 'north', //顶部面板
html: '<h1 class="x-panel-header">Page Title</h1>',
autoHeight: true,
border: false,
margins: '0 0 5 0'
}, {
region: 'west', //左部面板
collapsible: true,
title: 'Navigation',
xtype: 'treepanel',
width: 200,
autoScroll: true,
split: true, //可左右拉动
loader: new Ext.tree.TreeLoader(),
root: new Ext.tree.AsyncTreeNode({
expanded: true,
children: [{
text: 'Menu Option 1',
leaf: true
}, {
text: 'Menu Option 2',
leaf: true
}, {
text: 'Menu Option 3',
leaf: true
}]
}),
rootVisible: false,
listeners: {
click: function(n) {
Ext.Msg.alert('Navigation Tree Click', 'You clicked: "' + n.attributes.text + '"');
}
}
}, {
region: 'center', //中央面板，每个Viewport的items中都需要设置一个center，就算只有一个item，不然会报错
xtype: 'tabpanel',
items: {
title: 'Default Tab',
html: 'The first tab\'s content. Others may be added dynamically'
}
}, {
region: 'south', //底部面板
title: 'Information',
collapsible: true,
html: 'Information goes here',
split: true,
height: 100,
minHeight: 100
}]
});
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当然在平时用时可以以结合div来实现界面的布局,extjs 的实例中的examples/layout/complex.html中可以学到这种方式的写法：
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Ext.onReady(function(){
// NOTE: This is an example showing simple state management. During development,
// it is generally best to disable state management as dynamically-generated ids
// can change across page loads, leading to unpredictable results. The developer
// should ensure that stable state ids are set for stateful components in real apps.
Ext.state.Manager.setProvider(new Ext.state.CookieProvider());
var viewport = new Ext.Viewport({
layout: 'border',
items: [
// create instance immediately
new Ext.BoxComponent({
region: 'north',
height: 32, // give north and south regions a height
autoEl: {
tag: 'div',
html:'<p>north - generally for menus, toolbars and/or advertisements</p>'
}
}), {
// lazily created panel (xtype:'panel' is default)
region: 'south',
contentEl: 'south', // 渲染到html的south
split: true,
height: 100,
minSize: 100,
maxSize: 200,
collapsible: true,
title: 'South',
margins: '0 0 0 0'
}, {
region: 'east',
title: 'East Side',
collapsible: true,
split: true,
width: 225, // give east and west regions a width
minSize: 175,
maxSize: 400,
margins: '0 5 0 0',
layout: 'fit', // specify layout manager for items
items: // this TabPanel is wrapped by another Panel so the title will be applied
new Ext.TabPanel({
border: false, // already wrapped so don't add another border
activeTab: 1, // second tab initially active
tabPosition: 'bottom',
items: [{
html: '<p>A TabPanel component can be a region.</p>',
title: 'A Tab',
autoScroll: true
}, new Ext.grid.PropertyGrid({
title: 'Property Grid',
closable: true,
source: {
"(name)": "Properties Grid",
"grouping": false,
"autoFitColumns": true,
"productionQuality": false,
"created": new Date(Date.parse('10/15/2006')),
"tested": false,
"version": 0.01,
"borderWidth": 1
}
})]
})
}, {
region: 'west', //左部面板
id: 'west-panel', // see Ext.getCmp() below
title: 'West',
split: true,
width: 200,
minSize: 175,
maxSize: 400,
collapsible: true,
margins: '0 0 0 5',
layout: {
type: 'accordion',
animate: true
},
items: [{
contentEl: 'west', // 渲染到html的west
title: 'Navigation',
border: false,
iconCls: 'nav' // see the HEAD section for style used
}, {
title: 'Settings',
html: '<p>Some settings in here.</p>',
border: false,
iconCls: 'settings'
}]
},
// in this instance the TabPanel is not wrapped by another panel
// since no title is needed, this Panel is added directly
// as a Container
new Ext.TabPanel({
region: 'center', // a center region is ALWAYS required for border layout
deferredRender: false,
activeTab: 0, // first tab initially active
items: [{
contentEl: 'center1',
title: 'Close Me',
closable: true,
autoScroll: true
}, {
contentEl: 'center2',
title: 'Center Panel',
autoScroll: true
}]
})]
});
// get a reference to the HTML element with id "hideit" and add a click listener to it
Ext.get("hideit").on('click', function(){
// get a reference to the Panel that was created with id = 'west-panel'
var w = Ext.getCmp('west-panel');
// expand or collapse that Panel based on its collapsed property state
w.collapsed ? w.expand() : w.collapse();
});
});
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<div id="west" class="x-hide-display">
<p>Hi. I'm the west panel.</p>
</div>
<div id="center2" class="x-hide-display">
<a id="hideit" href="#">Toggle the west region</a>
<p>My closable attribute is set to false so you can't close me. The other center panels can be closed.</p>
<p>The center panel automatically grows to fit the remaining space in the container that isn't taken up by the border regions.</p>
<hr>
</div>
<div id="center1" class="x-hide-display">
<p><b>Done reading me? Close me by clicking the X in the top right corner.</b>
</p>
</div>
<div id="props-panel" class="x-hide-display" style="width:200px;height:200px;overflow:hidden;">
</div>
<div id="south" class="x-hide-display">
<p>south - generally for informational stuff, also could be for status bar</p>
</div>
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当然，通过其他组件与Viewport结合还可以开发各种各样炫的界面！
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