Textarea 对象

The Textarea object represents a text-area in an HTML form. For each instance of an HTML <textarea> tag in a form, a Textarea object is created.
Textarea对象代表了HTML表单中的文字区域。每当表单中出现<textarea>标签就意味着建立了Textarea对象

You can access a Textarea object by indexing the elements array (by number or name) of the corresponding form or by using getElementById().
你可以使用索引元素数组的索引数或是名称来访问Textarea对象，也可以使用getElementById()来访问

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

Textarea 对象属性

Property 属性	Description 描述	IE	F	N	W3C
accessKey	Sets or returns the keyboard key to access the textarea 设置或返回访问textarea的快捷键	4			Yes
cols	Sets or returns the width (in characters) of the textarea 设置或返回textarea的宽度（用每行可容纳的文字数来做依据）	3	1	6	Yes
defaultValue	Sets or returns the initial contents of the textarea 设置或返回textarea初始内容	3			Yes
disabled	Sets or returns whether or not the textarea should be disabled 设置或返回textarea的状态	5	1	6	Yes
form	Returns a reference to the textarea's parent form 返回textarea的父表参考	3	1	2	Yes
id	Sets or returns the id of the textarea (In IE 4 this property is read-only) 设置或返回textarea的id值	4	1		No
name	Sets or returns the name of the textarea 设置或返回textarea的name	3	1	2	Yes
readOnly	Sets or returns whether or not the textarea should be read-only 设置或返回textarea是否应该为只读	4	1	6	Yes
rows	Sets or returns the height (in rows) of the textarea 设置或返回textarea的高度(可由rows属性值来做调整)	3	1	6	Yes
tabIndex	Sets or returns the tab order for the textarea 设置或返回textarea的tab顺序	4			Yes
type	Returns the type of the form element. For a textarea object it will always be "textarea" 返回表单元素类型。textarea对象返回为"textarea"	3	1	3	Yes
value	Sets or returns the text in the textarea 设置或返回textarea的文字	3	1	2	Yes

Textarea 对象方法

Method 方法	Description 描述	IE	F	N	W3C
blur()	Removes focus from the textarea 取消textarea的焦点	3	1	2	Yes
click()	Simulates a mouse-click in the textarea 模仿鼠标在textarea里的点击	4			No
focus()	Sets focus on the textarea 为textarea设置焦点	3	1	2	Yes
select()	Selects and highlights the entire text that is in the textarea 选中并用高亮textarea里面的文字	4	1	2	Yes

Textarea 对象事件

语法: object.event_name="someJavaScriptCode"

Event 事件	Description 描述	IE	F	N	W3C
onBlur	Executes some code when the textarea loses focus 当textarea失去焦点的时候执行代码	3	1	2
onChange	Executes some code when the textarea loses focus and its value has altered 当textarea失去焦点的时候里面的内容又发生变化则执行一些代码	3	1	2
onClick	Executes some code when the user clicks the left mouse button in the textarea 当鼠标左键在textarea里点击后执行某些代码	4
onFocus	Executes some code when the textarea gets focus 当textarea得到焦点的时候执行代码	3	1	2
onKeyDown	Executes some code when a key is pressed down in the textarea 当在textarea里按住键的时候执行某些代码		1	4
onKeyPress	Executes some code when a key is pressed in the textarea 当textarea里按过键就执行某些代码		1	4
onKeyUp	Executes some code when a key is released in the textarea 当在textarea里释放按键的时候执行代码		1	4
onSelect	Executes some code when some text in the textarea is selected 当textarea里的某些文字被选中的时候执行某些代码		1	2

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