在javascript中，checked是什么意思？怎么用？

chst 2006-01-01 12:53:38

在javascript中，checked是什么意思？怎么用？盼高手指点迷津！

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Aallonlin 2006-01-03

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checked 复选框或选项按钮(单选按钮)的状态

表示是否选中当前项.

梅雪香 2006-01-01

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CHECKED Attribute | checked Property Internet Development Index

--------------------------------------------------------------------------------

Sets or retrieves the state of the check box or radio button.

Syntax

HTML <ELEMENT CHECKED ... >
Scripting object.checked [ = bChecked ]

Possible Values

bChecked Boolean that specifies or receives one of the following values.false Default. Control is not selected.
true Control is selected.

The property is read/write. The property has a default value of false.

Remarks

Check boxes that are not selected do not return their values when the form is submitted.

A user can select a radio button only if the button has a name. To clear a selected radio button, a user must select another button in the set.

Example

This example retrieves the checked property to fire an event.

HideExample

<HEAD>
<SCRIPT>
function checkthis()
{
if (oCheckbox.checked == true)
{
alert("It's got a check; now off to Microsoft!");
window.open("http://www.microsoft.com");
}
}
</SCRIPT>
</HEAD>
<BODY>
Check here if you wish to go to Microsoft:
<INPUT ID=oCheckbox TYPE=checkbox onclick=checkthis()>
</BODY>
Show Me
Standards Information

This property is defined in HTML 3.2 and is defined in World Wide Web Consortium (W3C) Document Object Model (DOM) Level 1 .

Applies To

[ Object Name ]
Platform Version
Win16:
Win32:
Windows CE:
Unix:
Mac:
Version data is listed when the mouse hovers over a link, or the link has focus.
INPUT type=checkbox, INPUT type=radio
Move the mouse pointer over an element in the Applies To list to display availability information for the listed platforms.

See Also

defaultChecked, Introduction to Forms

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