Ext 学习之旅简单学习快乐学习之tree菜单优化和页面加载讲解

刘金剑

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EXT CSS JavaScript HTML IE

上一节中有写bug没有解决，这一节中将解决掉它，第一次写可能不够详细，有问题qq邮寄给我：380837242@qq.com，

先上代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link type="text/css" rel="stylesheet" href="../../resources/css/ext-all.css" />
<script type="text/javascript" src="../../adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="../../ext-all.js"></script>
<link type="text/css" rel="stylesheet" href="../shared/examples.css" />
<script type="text/javascript" src="../shared/examples.js"></script>
<title>index</title>
</head>

<body>
<script type="text/javascript">
var tab = new Ext.TabPanel({
	id:'centerPage',
	region:'center',
	deferredRender:false,
	activeTab:0,
	title:"中央面板",
	resizeTabs:true, // turn on tab resizing
	minTabWidth: 115,
	tabWidth:135,
	enableTabScroll:true
});
Ext.onReady(function(){ 
	new Ext.Viewport({
		enableTabScroll:true,
		layout:"border",
		items:[
			{
				id:'topPage',
				region:"north",
				//html: '<h1 class="x-panel-header">Page Title</h1>',
				//autoHeight: true,
				//border: false,
				//split: true,
				//margins: '0 0 0 0',
				collapsible: true,
				collapseMode: 'mini',
				height:50,
				title:"顶部面板"
			},{
				id:'bottomPage',
				region:"south",
				collapsible: true,
				html: 'Information goes here',
				collapseMode: 'mini',
				//split: true,
				height: 50,
				title:"底部面板"
			},tab,{
				id:'leftPage',
				region:"west",
				collapsible: true,
				collapseMode: 'mini',
				//split: true,
				width:200,
				title:"左边面板",
				layout: 'accordion',
				bodyStyle: {
					'background-color': '#eee'
				},
//				defaults: {
//					border: false
//				},
				items: [	
						{title: 'Item 1',border:false,html: '<div id="tree1" style="overflow:auto;width:100%;height:100%"></div>'},
						{title: 'Item 2',border:false,html: '<div id="tree2" style="overflow:auto;width:100%;height:100%"></div>'},
						{title: 'Item 3',border:false,html: '<div id="tree3" style="overflow:auto;width:100%;height:100%"></div>'}
					]
			},{
				id:'rightPage',
				region:"east",
				width:100,
				collapsible: true,
				collapseMode: 'mini',
				//split: true,
				title:"右边面板"
			}
		]
	}); 
	var root2=new Ext.tree.TreeNode({
		id:"root2",
		text:"树的根"
	});
	
	var c1=new Ext.tree.TreeNode({
		id:'c1',
		icon:'../../resources/images/yourtheme/menu/group-checked.gif',
		text:'源码网',
		listeners:{    
		'click':function(node, event) {    
			event.stopEvent();    
			var n = tab.getComponent(node.id);    
			if (!n) { //判断是否已经打开该面板    
				 n = tab.add({    
					'id':node.id,    
					'title':node.text,    
					 closable:true,  //通过html载入目标页    
					 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.codefans.net"></iframe>'   
				 });    
			 }    
			 tab.setActiveTab(n);    
		 }    
		}
	});
	
	var c2=new Ext.tree.TreeNode({
		id:'c2',
		icon:'../../resources/images/yourtheme/menu/group-checked.gif',
		text:'博客园',
		listeners:{    
		'click':function(node, event) {    
			event.stopEvent();    
			var n = tab.getComponent(node.id);    
			if (!n) { //判断是否已经打开该面板    
				 n = tab.add({    
					'id':node.id,    
					'title':node.text,    
					 closable:true,  //通过html载入目标页    
					 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.cnblogs.com/"></iframe>'   
				 });    
			 }    
			 tab.setActiveTab(n);    
		 }    
		}
	});
	
	var c3=new Ext.tree.TreeNode({
		id:'c3',
		icon:'../../resources/images/yourtheme/menu/group-checked.gif',
		text:'JavaEye',
		listeners:{    
		'click':function(node, event) {    
			event.stopEvent();    
			var n = tab.getComponent(node.id);    
			if (!n) { //判断是否已经打开该面板    
				 n = tab.add({    
					'id':node.id,    
					'title':node.text,    
					 closable:true,  //通过html载入目标页    
					 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.iteye.com"></iframe>'   
				 });    
			 }    
			 tab.setActiveTab(n);    
		 }    
		}
	});
	var c4=new Ext.tree.TreeNode({
		id:'c4',
		icon:'../../resources/images/yourtheme/menu/group-checked.gif',
		text:'网易',
		listeners:{    
		'click':function(node, event) {    
			event.stopEvent();    
			var n = tab.getComponent(node.id);    
			if (!n) { //判断是否已经打开该面板    
				 n = tab.add({    
					'id':node.id,    
					'title':node.text,    
					 closable:true,  //通过html载入目标页    
					 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.163.com"></iframe>'   
				 });    
			 }    
			 tab.setActiveTab(n);    
		 }    
		}
	});
	
	var c5=new Ext.tree.TreeNode({
		id:'c5',
		icon:'../../resources/images/yourtheme/menu/group-checked.gif',
		text:'新浪',
		listeners:{    
		'click':function(node, event) {    
			event.stopEvent();    
			var n = tab.getComponent(node.id);    
			if (!n) { //判断是否已经打开该面板    
				 n = tab.add({    
					'id':node.id,    
					'title':node.text,    
					 closable:true,  //通过html载入目标页    
					 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.sina.com.cn"></iframe>'   
				 });    
			 }    
			 tab.setActiveTab(n);    
		 }    
		}
	});
	var c6=new Ext.tree.TreeNode({
		id:'c6',
		icon:'../../resources/images/yourtheme/menu/group-checked.gif',
		text:'百度',
		listeners:{    
		'click':function(node, event) {    
			event.stopEvent();    
			var n = tab.getComponent(node.id);    
			if (!n) { //判断是否已经打开该面板    
				 n = tab.add({    
					'id':node.id,    
					'title':node.text,    
					 closable:true,  //通过html载入目标页    
					 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.baidu.com"></iframe>'   
				 });    
			 }    
			 tab.setActiveTab(n);    
		 }    
		}
	});
	var c7=new Ext.tree.TreeNode({
		id:'c7',
		icon:'../../resources/images/yourtheme/menu/group-checked.gif',
		text:'AddTable',
		listeners:{    
		'click':function(node, event) {    
			event.stopEvent();    
			var n = tab.getComponent(node.id);    
			if (!n) { //判断是否已经打开该面板    
				 n = tab.add({    
					title: 'New Tab ' + (++index),
					iconCls: 'tabs',
					html: 'Tab Body ' + (index) + '<br/><br/>'
							+ Ext.example.bogusMarkup,
					closable:true  
				 });    
			 }    
			 tab.setActiveTab(n);    
		 }    
		}
	});
	var c8=new Ext.tree.TreeNode({
		id:'c8',
		icon:'../../resources/images/yourtheme/menu/group-checked.gif',
		text:'upload',
		listeners:{    
		'click':function(node, event) {    
			event.stopEvent();    
			var n = tab.getComponent(node.id);    
			if (!n) { //判断是否已经打开该面板    
				 n = tab.add({    
					'id':node.id,    
					'title':node.text,    
					 closable:true,  //通过html载入目标页    
					 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="upload.html"></iframe>'
				 });    
			 }    
			 tab.setActiveTab(n);    
		 }    
		}
	});
	//c1.appendChild(c2);
//	c1.appendChild(c22);
	root2.appendChild(c1);
	root2.appendChild(c2);
	root2.appendChild(c3);
	root2.appendChild(c4);
	root2.appendChild(c5);
	root2.appendChild(c6);
	root2.appendChild(c7);
	root2.appendChild(c8);
	//root2.appendChild(c3)
	
	var tree2=new Ext.tree.TreePanel({
		renderTo:"tree1",
		root:root2,    //对应 根节点
		animate:true,
		enableDD:false,
		border:false,
		rootVisible:false,
		lines:false,
		containerScroll: true
	});
	
	var index = 0;
    while(index < 7){
        addTab();
    }
    function addTab(){
        tab.add({
            title: 'New Tab ' + (++index),
            iconCls: 'tabs',
            html: 'Tab Body ' + (index) + '<br/><br/>'
                    + Ext.example.bogusMarkup,
            closable:true
        }).show();
    }
	
	new Ext.Button({
        text: 'Add Tab',
		width:198,
        handler: addTab
        //iconCls:'new-tab'
    }).render(document.body, 'tree2');
	
	/*dialog = new Ext.ux.UploadDialog.Dialog({
	  url: 'upload-dialog-request.php',
	  reset_on_hide: false,
	  allow_close_on_upload: true,
	  upload_autostart: true
	});
	dialog.show('tree3');*/
	function getDes(){
		alert(123);
	}
	new Ext.Button({
        text: 'upload',
		width:198,
        handler: getDes
        //iconCls:'new-tab'
    }).render(document.body, 'tree3');
});

</script>
</body>
</html>
把文件的路径后移了两个目录就可以直接显示数的菜单了，之前是图片照成的，我把代码注释一下讲解。
但我觉得代码没有什么要说的，看一下就懂，我把上传文件的页面给加载进来，有不懂得直接发邮件给我，
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Firefox3,IE6,IE7,IE8上传图片预览</title>
<style type="text/css">
#preview_wrapper{
	display:inline-block;
	width:150px;
	height:150px;
	background-color:#CCC;
}
#preview_fake{ /* 该对象用于在IE下显示预览图片 */
	filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);
}
#preview_size_fake{ /* 该对象只用来在IE下获得图片的原始尺寸，无其它用途 */
	filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);	
	visibility:hidden;
}
#preview{ /* 该对象用于在FF下显示预览图片 */
	width:150px;
	height:150px;
}
</style>

<script type="text/javascript">
function onUploadImgChange(sender){
	if( !sender.value.match( /.jpg|.gif|.png|.bmp/i ) ){
		alert('图片格式无效！');
		return false;
	}
	
	var objPreview = document.getElementById( 'preview' );
	var objPreviewFake = document.getElementById( 'preview_fake' );
	var objPreviewSizeFake = document.getElementById( 'preview_size_fake' );
	
	if( sender.files &&  sender.files[0] ){
		objPreview.style.display = 'block';
		objPreview.style.width = 'auto';
		objPreview.style.height = 'auto';
		
		// Firefox 因安全性问题已无法直接通过 input[file].value 获取完整的文件路径
		objPreview.src = sender.files[0].getAsDataURL();	
	}else if( objPreviewFake.filters ){ 
		// IE7,IE8 在设置本地图片地址为 img.src 时出现莫名其妙的后果
		//（相同环境有时能显示，有时不显示），因此只能用滤镜来解决
		
		// IE7, IE8因安全性问题已无法直接通过 input[file].value 获取完整的文件路径
		sender.select();
		var imgSrc = document.selection.createRange().text;
		
		objPreviewFake.filters.item(
			'DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;
		objPreviewSizeFake.filters.item(
			'DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;
		
		autoSizePreview( objPreviewFake, 
			objPreviewSizeFake.offsetWidth, objPreviewSizeFake.offsetHeight );
		objPreview.style.display = 'none';
	}
}

function onPreviewLoad(sender){
	autoSizePreview( sender, sender.offsetWidth, sender.offsetHeight );
}

function autoSizePreview( objPre, originalWidth, originalHeight ){
	var zoomParam = clacImgZoomParam( 150, 150, originalWidth, originalHeight );
	objPre.style.width = zoomParam.width + 'px';
	objPre.style.height = zoomParam.height + 'px';
	objPre.style.marginTop = zoomParam.top + 'px';
	objPre.style.marginLeft = zoomParam.left + 'px';
}

function clacImgZoomParam( maxWidth, maxHeight, width, height ){
	var param = { width:width, height:height, top:0, left:0 };
	
	if( width>maxWidth || height>maxHeight ){
		rateWidth = width / maxWidth;
		rateHeight = height / maxHeight;
		
		if( rateWidth > rateHeight ){
			param.width =  maxWidth;
			param.height = height / rateWidth;
		}else{
			param.width = width / rateHeight;
			param.height = maxHeight;
		}
	}
	
	param.left = (maxWidth - param.width) / 2;
	param.top = (maxHeight - param.height) / 2;
	
	return param;
}
</script>

</head>

<body>
	
	<input id="upload_img" type="file" onchange="onUploadImgChange(this)"/>
	<div id="preview_wrapper">
		<div id="preview_fake">
			<img id="preview" onload="onPreviewLoad(this)"/>
		</div>
	</div>
	<br/>
	<br/>
	<img id="preview_size_fake"/>
</body>
</html>