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8.9 Disabling Form Controls
NN 6, IE 4
8.9.1 Problem
You want to temporarily lock
down a form control to prevent user access to the control.
8.9.2 Solution
In IE 4 or later and NN 6 or later, form controls provide a Boolean
disabled property that scripts can change at
any time. Use any valid reference to the form control to set its
disabled property to true:
document.myForm.myFirstTextBox.disabled = true;
To restore functionality to the control, set its
disabled property to false:
document.myForm.myFirstTextBox.disabled = false;
A disabled form control generally displays a greyed-out appearance
and does not permit user modification of the setting.
8.9.3 Discussion
Figure 8-1 with form controls disabled. While scripts can
still read and write values in disabled controls, a disabled form
control's name/value pair does not submit to the
server at submission time.
Figure 8-2. A form with disabled controls
IE 4 and later for Windows provides a more pervasive
disabled property, available to all renderable
element objects. But the property is not fully inheritable. For
example, if you set the disabled property of a
form element object to true,
the nested controls might look disabled (as will their text labels),
but users can still access the controls to modify their content. If
you want to disable both the labels and controls in IE for Windows,
disable the controls and the containing form at the same time. IE 5
for Macintosh and Netscape 6 or 7 do not support disabling of nonform
elements.
8.9.4 See Also
Recipe 8.10 for hiding portions of a form until
they're needed; Recipe 12.7 for hiding and showing
elements.
