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DOM Textarea 对象 
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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