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From: Stephen Berman <stephen.berman@gmx.net>
To: Heime <heimeborgia@protonmail.com>
Cc: Heime via Users list for the GNU Emacs text editor
	<help-gnu-emacs@gnu.org>
Subject: Re: Buttons in help buffer that displays contents of variables
Date: Sat, 22 Jul 2023 22:14:05 +0200	[thread overview]
Message-ID: <87h6pvvh4i.fsf@gmx.net> (raw)
In-Reply-To: <laL1dmjayVPBEnOrD-HPuduJ77ul1WXAQ_WC4ngQhRmh0liFTDcVhXnS97l2_NE6dyLeUTZTjjy2THLAtKtw-BE30WDn9zXCHT5DbEPEzBw=@protonmail.com> (Heime's message of "Sat, 22 Jul 2023 19:18:03 +0000")

On Sat, 22 Jul 2023 19:18:03 +0000 Heime <heimeborgia@protonmail.com> wrote:

> ------- Original Message -------
> On Sunday, July 23rd, 2023 at 2:40 AM, Heime <heimeborgia@protonmail.com> wrote:
>
>
>> I want to use a button to display the contents of a variable inside
>> a help buffer, but the following gives
>>
>> (wrong-number-of-arguments ((t) nil "Function to be executed when the button
>> is clicked..." (interactive) (message "Button clicked!")) 1)
>> my-action(#<overlay from 1 to 8 in Help>)
>>
>
> Why does pressing the button give me such error ?
>
>>
>> (defconst myvar "Text of Front A")
>>
>> (defun my-action ()
>> "Function to be executed when the button is clicked."
>> (interactive)
>> (message "%s" myvar))
>>
>> (defun qrh ()
>> "Some description."
>>
>> (interactive)
>>
>> (with-help-window (help-buffer)
>> (insert-button "Front A" 'action 'my-action 'follow-link t)))

The error says the function my-action expects one argument, but you
defined it with an empty argument list.  If you don't want to use the
argument, you can use `_' as a placeholder for the required argument,
which will be ignored by the byte compiler:

(defun my-action (_)
  "Function to be executed when the button is clicked."
  (interactive)
  (message "%s" myvar))

Steve Berman



  reply	other threads:[~2023-07-22 20:14 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-22 14:40 Buttons in help buffer that displays contents of variables Heime
2023-07-22 19:18 ` Heime
2023-07-22 20:14   ` Stephen Berman [this message]
2023-07-22 20:24     ` Heime
2023-07-22 20:48       ` Stephen Berman
2023-07-22 21:24         ` Heime
2023-07-22 21:46           ` Stephen Berman
2023-07-22 22:02             ` Heime
2023-07-22 22:13               ` Heime
2023-07-22 22:28                 ` Stephen Berman
2023-07-22 22:42                   ` Heime
2023-07-22 22:50                     ` Stephen Berman
2023-07-22 23:13                       ` Heime
2023-07-23  7:45                         ` Yuri Khan
2023-07-23 19:34                           ` Heime
2023-07-23 19:57                             ` Yuri Khan
2023-07-23 20:05                               ` Heime

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