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 22:48:11 +0200 [thread overview]
Message-ID: <87cz0jvfjo.fsf@gmx.net> (raw)
In-Reply-To: <o3gJIij13i95zOUsexuqnl58EVr7jgG-mLLdM-eKvW7cYYBnxzyT6nHCKy1daekAe_gOzLuUMa9TLy-RNloMhtbDbQ0nxR-5Ljb8KHCBaPE=@protonmail.com> (Heime's message of "Sat, 22 Jul 2023 20:24:16 +0000")
On Sat, 22 Jul 2023 20:24:16 +0000 Heime <heimeborgia@protonmail.com> wrote:
> ------- Original Message -------
> On Sunday, July 23rd, 2023 at 8:14 AM, Stephen Berman <stephen.berman@gmx.net> wrote:
>
>
>> 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
>
> I do not understand the reason it expects an argument.
In the Emacs Lisp info manual there is the node `(elisp) Buttons', whose
first subnode is `(elisp) Button Properties', whose first entry is the
`action' property:
‘action’
The function to call when the user invokes the button, which is
passed the single argument BUTTON. By default this is ‘ignore’,
which does nothing.
> Would there be
> a more suitable way to print some text after pressing the button ?
If you want to use a button, then I guess not, since it needs an action
(or mouse-action) property to do something on pressing the button.
Steve Berman
next prev parent reply other threads:[~2023-07-22 20:48 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
2023-07-22 20:24 ` Heime
2023-07-22 20:48 ` Stephen Berman [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87cz0jvfjo.fsf@gmx.net \
--to=stephen.berman@gmx.net \
--cc=heimeborgia@protonmail.com \
--cc=help-gnu-emacs@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.