FileUpload 对象

For each instance of an <input type="file"> tag in an HTML form, a FileUpload object is created.
HTML表单中出现<input type="file">标签就意味着FileUpload对象建立起来了

You can access a FileUpload object by indexing the elements array (by number or name) of the corresponding form or by using getElementById().
你可以通过元素数组索引或是用getElementById()来访问FileUpload对象

IE: Internet Explorer, F: Firefox, N: Netscape, W3C: World Wide Web Consortium (Internet Standard).

FileUpload 对象属性

Property 属性	Description 描述	IE	F	N	W3C
accept	Sets or returns a list of content types, which the server processing this form will handle correctly 设置或返回内容类型列表，服务器可更准确的处理表单	-			Yes
accessKey	Sets or returns the keyboard key to access the FileUpload object 设置或返回可访问FileUpload对象的按键	4			Yes
align	Sets or returns the alignment of the FileUpload object according to the surrounding text 设置或返回FileUpload对象相对于周围文字的对齐方式	-			Yes
alt	Sets or returns an alternate text to display if the browser does not support <input type="file"> 设置或返回替换显示的文字，针对那些无法支持<input type="file">的浏览器	-			Yes
defaultValue	Sets or returns the initial value of the FileUpload object 设置或返回FileUpload对象的初始值	4	1	3	Yes
disabled	Sets or returns whether or not the FileUpload object should be disabled 设置或返回FileUpload对象是否可用	4			Yes
form	Returns a reference to the form that contains the FileUpload object 返回包含FileUpload对象的表单参考	4	1	3	Yes
id	Sets or returns the id of the FileUpload object (In IE 4 this property is read-only) 设置或返回FIleUpload对象的id	4	1		No
name	Sets or returns the name of the FileUpload object 设置或返回FileUpload对象的name	4	1	3	Yes
tabIndex	Sets or returns the index that defines the tab order for the FileUpload object 设置或返回FileUpload对象的tab顺序	4			Yes
type	Returns the type of the form element. For a FileUpload object it will be "file" 返回表单元素类型，FileUpload对象就返回"file"	4	1	3	Yes
value	Returns the file name of the FileUpload object after the text is set by user input 返回FileUpload对象在用户输入后的文件名称	4	1	3	Yes

FileUpload 对象方法

Method 方法	Description 描述	IE	F	N	W3C
blur()	Removes focus from the FileUpload object 取消对FileUpload对象的聚焦	4	1	3	Yes
click()	Simulates a mouse-click on the FileUpload object 模仿鼠标点击FileUpload对象	4			No
focus()	Gives focus to the FileUpload object 让FileUpload对象获得聚焦	4	1	3	Yes
select()	Selects the FileUpload object 选择FileUpload对象	4			Yes

FileUpload 对象事件

Syntax: object.event_name="someJavaScriptCode"
语法：对象.事件名称="一些JS代码"

Event 事件	Description 描述	IE	F	N	W3C
onBlur	Executes some code when the FileUpload object loses focus 当FileUpload对象失去聚焦的时候执行代码	4	1	3
onClick	Executes some code when the FileUpload object gets a mouse click 当FileUpload对象被鼠标点击的时候执行代码	4	1	3
onFocus	Executes some code when the FileUpload object gets focus 当FileUpload对象获得聚焦的时候执行代码	4	1	3
onSelectStart	Executes some code when the FileUpload object gets selected 当FileUpload对象被选中的时候执行代码	4

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