Document.queryCommandEnabled() - Web APIs 编辑

Obsolete

This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The Document.queryCommandEnabled() method reports whether or not the specified editor command is enabled by the browser.

Syntax

isEnabled = document.queryCommandEnabled(command);

Parameters

command

The command for which to determine support.

Return value

Returns a Boolean which is true if the command is enabled and false if the command isn't.

Notes

• For 'cut' and 'copy' commands the method only returns true when called from a user-initiated thread.
• The 'paste' command return false not only if the feature is unavailable, but also if the script calling it has insufficient privileges to perform the action.

Example

var flg = document.queryCommandEnabled("SelectAll");

if(flg) {
  document.execCommand("SelectAll", false, null); // command is enabled, run it
}

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• Document.execCommand()
• Document.queryCommandSupported()