extjs 上传文件 fileUpload

上传文件要是用asp.net的控件上传其实是很简单的问题，要是为了用户体验的提高很多的web开发人员都会采取很炫的ajax上传。

或是用flash想用的控件上传。今天我们看看extjs中如何很炫的上传文件或图片。

查了查资料发现extjs上传文件需要一个js文件FileUploadField.js，在extjs类库文件里可以找到。

FileUploadField.js代码如下：

[javascript]
view plaincopyprint?

/*!
* Ext JS Library 3.2.0
* Copyright(c) 2006-2010 Ext JS, Inc.

* licensing@extjs.com
* http://www.extjs.com/license */
Ext.ns('Ext.ux.form');

/**
* @class Ext.ux.form.FileUploadField
* @extends Ext.form.TextField
* Creates a file upload field.
* @xtype fileuploadfield
*/
Ext.ux.form.FileUploadField = Ext.extend(Ext.form.TextField, {
/**
* @cfg {String} buttonText The button text to display on the upload button (defaults to

* 'Browse...'). Note that if you supply a value for {@link #buttonCfg}, the buttonCfg.text

* value will be used instead if available.

*/
buttonText: 'Browse...',
/**
* @cfg {Boolean} buttonOnly True to display the file upload field as a button with no visible

* text field (defaults to false). If true, all inherited TextField members will still be available.

*/
buttonOnly: false,
/**
* @cfg {Number} buttonOffset The number of pixels of space reserved between the button and the text field

* (defaults to 3). Note that this only applies if {@link #buttonOnly} = false.

*/
buttonOffset: 3,
/**
* @cfg {Object} buttonCfg A standard {@link Ext.Button} config object.

*/

// private
readOnly: true,

/**
* @hide
* @method autoSize
*/
autoSize: Ext.emptyFn,

// private
initComponent: function(){
Ext.ux.form.FileUploadField.superclass.initComponent.call(this);

this.addEvents(
/**
* @event fileselected
* Fires when the underlying file input field's value has changed from the user

* selecting a new file from the system file selection dialog.

* @param {Ext.ux.form.FileUploadField} this
* @param {String} value The file value returned by the underlying file input field

*/
'fileselected'
);
},

// private
onRender : function(ct, position){
Ext.ux.form.FileUploadField.superclass.onRender.call(this, ct, position);

this.wrap = this.el.wrap({cls:'x-form-field-wrap x-form-file-wrap'});

this.el.addClass('x-form-file-text');

this.el.dom.removeAttribute('name');

this.createFileInput();

var btnCfg = Ext.applyIf(this.buttonCfg || {}, {

text: this.buttonText
});
this.button =
new Ext.Button(Ext.apply(btnCfg, {
renderTo: this.wrap,
cls: 'x-form-file-btn' + (btnCfg.iconCls ?
' x-btn-icon' : '')
}));

if(this.buttonOnly){

this.el.hide();
this.wrap.setWidth(this.button.getEl().getWidth());

}

this.bindListeners();
this.resizeEl = this.positionEl =
this.wrap;
},

bindListeners: function(){
this.fileInput.on({
scope: this,
mouseenter: function() {
this.button.addClass(['x-btn-over','x-btn-focus'])

},
mouseleave: function(){
this.button.removeClass(['x-btn-over','x-btn-focus','x-btn-click'])

},
mousedown: function(){
this.button.addClass('x-btn-click')

},
mouseup: function(){
this.button.removeClass(['x-btn-over','x-btn-focus','x-btn-click'])

},
change: function(){
var v = this.fileInput.dom.value;

this.setValue(v);
this.fireEvent('fileselected',
this, v);
}
});
},

createFileInput : function() {
this.fileInput =
this.wrap.createChild({
id: this.getFileInputId(),
name: this.name||this.getId(),

cls: 'x-form-file',
tag: 'input',
type: 'file',
size: 1
});
},

reset : function(){
this.fileInput.remove();
this.createFileInput();
this.bindListeners();
Ext.ux.form.FileUploadField.superclass.reset.call(this);

},

// private
getFileInputId: function(){
return this.id +
'-file';
},

// private
onResize : function(w, h){
Ext.ux.form.FileUploadField.superclass.onResize.call(this, w, h);

this.wrap.setWidth(w);

if(!this.buttonOnly){

var w = this.wrap.getWidth() -
this.button.getEl().getWidth() -
this.buttonOffset;
this.el.setWidth(w);
}
},

// private
onDestroy: function(){
Ext.ux.form.FileUploadField.superclass.onDestroy.call(this);

Ext.destroy(this.fileInput,
this.button, this.wrap);
},

onDisable: function(){
Ext.ux.form.FileUploadField.superclass.onDisable.call(this);

this.doDisable(true);

},

onEnable: function(){
Ext.ux.form.FileUploadField.superclass.onEnable.call(this);

this.doDisable(false);

},

// private
doDisable: function(disabled){
this.fileInput.dom.disabled = disabled;
this.button.setDisabled(disabled);
},

// private
preFocus : Ext.emptyFn,

// private
alignErrorIcon : function(){
this.errorIcon.alignTo(this.wrap,
'tl-tr', [2, 0]);
}

});

Ext.reg('fileuploadfield', Ext.ux.form.FileUploadField);

// backwards compat
Ext.form.FileUploadField = Ext.ux.form.FileUploadField;

[xhtml]
view plaincopyprint?

<!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>

<title></title>

<link
rel="stylesheet"
type="text/css"
href="ext/resources/css/ext-all.css"
mce_href="ext/resources/css/ext-all.css"
/>
<script
type="text/javascript"
src="ext/adapter/ext/ext-base.js"
mce_src="ext/adapter/ext/ext-base.js"></script>

<script
src="ext/ext-all-debug.js"
mce_src="ext/ext-all-debug.js"
type="text/javascript"></script>

<script
src="js/FileUploadField.js"
mce_src="js/FileUploadField.js"
type="text/javascript"></script>

<style
type=text/css> .upload-icon {

background: url('images/image_add.png') no-repeat 0 0 !important;

}
.x-form-file-wrap {
position: relative;
height: 22px;
}
.x-form-file-wrap .x-form-file {
position: absolute;
right: 0;
-moz-opacity: 0;
filter:alpha(opacity: 0);
opacity: 0;
z-index: 2;
height: 22px;
}
.x-form-file-wrap .x-form-file-btn {
position: absolute;
right: 0;
z-index: 1;
}
.x-form-file-wrap .x-form-file-text {
position: absolute;
left: 0;
z-index: 3;
color: #777;
}
</style>

<script
type="text/javascript"><!--

Ext.onReady(function() {

Ext.QuickTips.init();

var msg = function(title, msg) {

Ext.Msg.show({
title: title,
msg: msg,
minWidth: 200,
modal: true,
icon: Ext.Msg.INFO,
buttons: Ext.Msg.OK
});

};

var fp = new Ext.FormPanel({

renderTo: 'fi-form',
fileUpload: true,
width: 500,
frame: true,
title: '图片上传操作',
autoHeight: true,
bodyStyle: 'padding: 10px 10px 0 10px;',
labelWidth: 50,
defaults: {
anchor: '95%',
allowBlank: false,
msgTarget: 'side'
},
items: [{
xtype: 'textfield',
fieldLabel: 'Name',
name:"txtname"
}, {
xtype: 'fileuploadfield',
id: 'form-file',
emptyText: 'Select an image',
fieldLabel: 'Photo',
name: 'photo-path',
buttonText: '',
buttonCfg: {
iconCls: 'upload-icon'
}
}],
buttons: [{
text: 'Save',
handler: function() {
if (fp.getForm().isValid()) {
fp.getForm().submit({
url: 'Default.aspx',//后台处理的页面
waitMsg: 'Uploading your photo...',
success: function(fp, o) {
msg('Success', 'Processed file "' + o.result.files + '" on the server');

}
});
}
}
}, {
text: 'Reset',
handler: function() {
fp.getForm().reset();
}
}]
});
});

// --></script>

</head>

<body>

<div
id="fi-form"></div>

</body>

</html>

<!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>
<title></title>
<link rel="stylesheet" type="text/css" href="ext/resources/css/ext-all.css" mce_href="ext/resources/css/ext-all.css" />
<script type="text/javascript" src="ext/adapter/ext/ext-base.js" mce_src="ext/adapter/ext/ext-base.js"></script>
<script src="ext/ext-all-debug.js" mce_src="ext/ext-all-debug.js" type="text/javascript"></script>
<script src="js/FileUploadField.js" mce_src="js/FileUploadField.js" type="text/javascript"></script>
<style type=text/css>        .upload-icon {
background: url('images/image_add.png') no-repeat 0 0 !important;
}
.x-form-file-wrap {
position: relative;
height: 22px;
}
.x-form-file-wrap .x-form-file {
position: absolute;
right: 0;
-moz-opacity: 0;
filter:alpha(opacity: 0);
opacity: 0;
z-index: 2;
height: 22px;
}
.x-form-file-wrap .x-form-file-btn {
position: absolute;
right: 0;
z-index: 1;
}
.x-form-file-wrap .x-form-file-text {
position: absolute;
left: 0;
z-index: 3;
color: #777;
}
</style>

<script type="text/javascript"><!--
Ext.onReady(function() {

Ext.QuickTips.init();

var msg = function(title, msg) {
Ext.Msg.show({
title: title,
msg: msg,
minWidth: 200,
modal: true,
icon: Ext.Msg.INFO,
buttons: Ext.Msg.OK
});

};

var fp = new Ext.FormPanel({
renderTo: 'fi-form',
fileUpload: true,
width: 500,
frame: true,
title: '图片上传操作',
autoHeight: true,
bodyStyle: 'padding: 10px 10px 0 10px;',
labelWidth: 50,
defaults: {
anchor: '95%',
allowBlank: false,
msgTarget: 'side'
},
items: [{
xtype: 'textfield',
fieldLabel: 'Name',
name:"txtname"
}, {
xtype: 'fileuploadfield',
id: 'form-file',
emptyText: 'Select an image',
fieldLabel: 'Photo',
name: 'photo-path',
buttonText: '',
buttonCfg: {
iconCls: 'upload-icon'
}
}],
buttons: [{
text: 'Save',
handler: function() {
if (fp.getForm().isValid()) {
fp.getForm().submit({
url: 'Default.aspx',//后台处理的页面
waitMsg: 'Uploading your photo...',
success: function(fp, o) {
msg('Success', 'Processed file "' + o.result.files + '" on the server');
}
});
}
}
}, {
text: 'Reset',
handler: function() {
fp.getForm().reset();
}
}]
});
});

// --></script>
</head>
<body>
<div id="fi-form"></div>

</body>
</html>

以上的代码都是显示上传的内容，而上传的关键在于后台是如何操作。

可以新建一个Default.aspx页面来进行上传的处理。在上传的提交时都是post进行提交的，所以关键是在后台要获取上传的对象。

在Page_Load中加入代码：

[c-sharp]
view plaincopyprint?

string newname = Request["txtname"];
//获取重命名
HttpPostedFile postedFile = Request.Files["photo-path"];//获取上传信息对象

string filename = postedFile.FileName;//获取上传的文件路径

string tempPath = System.Configuration.ConfigurationManager.AppSettings["NewsFolderPath"];//获取保存文件夹路径，我是设置在webconfig中了。

string savepath = Server.MapPath(tempPath);//获取保存路径

string sExtension = filename.Substring(filename.LastIndexOf('.'));//获取拓展名

if (!Directory.Exists(savepath))
Directory.CreateDirectory(savepath);
string sNewFileName = DateTime.Now.ToString("yyyyMMddhhmmsfff");

postedFile.SaveAs(savepath + @"/" + sNewFileName + sExtension);//保存

Response.Write("{success:true, files:'文件路径：" + filename +
" 重命名" + newname + "'}");

string newname = Request["txtname"]; //获取重命名
HttpPostedFile postedFile = Request.Files["photo-path"];//获取上传信息对象
string filename = postedFile.FileName;//获取上传的文件路径
string tempPath = System.Configuration.ConfigurationManager.AppSettings["NewsFolderPath"];//获取保存文件夹路径，我是设置在webconfig中了。
string savepath = Server.MapPath(tempPath);//获取保存路径
string sExtension = filename.Substring(filename.LastIndexOf('.'));//获取拓展名
if (!Directory.Exists(savepath))
Directory.CreateDirectory(savepath);
string sNewFileName = DateTime.Now.ToString("yyyyMMddhhmmsfff");
postedFile.SaveAs(savepath + @"/" + sNewFileName + sExtension);//保存

Response.Write("{success:true, files:'文件路径：" + filename + " 重命名" + newname + "'}");

演示图如下：



上传中：



上传ok：



原文链接：http://blog.csdn.net/lzy_1515/article/details/5734500