Re: [pve-devel] [PATCH manager] ui: lxc options: fix rendering default and '0' value for tty count

[Thomas Lamprecht <t.lamprecht@proxmox.com>]

Am 17.11.25 um 10:21 schrieb Dominik Csapak:
> if '0' was entered, the options grid would show an empty line. Fix that
> by adding a renderer that checks if the value is a number.

I was a bit confused by this, as it sounded like setting it to '0' in the
frontend caused some non-numeric value in the backend which then was handled
wrong here.

But it's really just the default renderer in PendingObjectGrid's renderValue
using a truthy fallback to empty string for the value, i.e. `value || ''`

Nowadays we could replace the boolean or `||` with a nullish coalescing
operator `??`, which is limited to fallback only if the value is exactly
one of `null` or `undefined`, that should also fix these issues in a more
generic fashion.

> 
> If the default is set, the edit window would always pre-fill the value
> '2' instead of leaving the field empty. Fix that by removing the
> manually set 'value' property.
> 
> Reported-by: Dietmar Maurer <dietmar@proxmox.com>
> Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
> ---
>  www/manager6/lxc/Options.js | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/www/manager6/lxc/Options.js b/www/manager6/lxc/Options.js
> index 6cc2e2b4..0acb88f4 100644
> --- a/www/manager6/lxc/Options.js
> +++ b/www/manager6/lxc/Options.js
> @@ -81,6 +81,7 @@ Ext.define('PVE.lxc.Options', {
>              tty: {
>                  header: gettext('TTY count'),
>                  defaultValue: 2,
> +                renderer: (value) => (Ext.isNumber(value) ? value : '2'),

But this would mask any other non-numeric value with "2" too, and then be
potentially misleading. Initially thought this was more theoretic, but
Ext.isNumeric basically comes down to `typeof value === "number"', so if
anything in the perl backend just "looks" at the returned value the wrong
way and it gets stringified along the way, we would mask the underlying
value here.

In Yew based UIs being fully typed is OK as there deserialization fails
explicitly and one has to chose the behavior for how one wants to handle
this, but in JS we (sadly) cannot really relay on this.


>                  editor: caps.vms['VM.Config.Options']
>                      ? {
>                            xtype: 'proxmoxWindowEdit',
> @@ -90,7 +91,6 @@ Ext.define('PVE.lxc.Options', {
>                                name: 'tty',
>                                minValue: 0,
>                                maxValue: 6,
> -                              value: 2,
>                                fieldLabel: gettext('TTY count'),
>                                emptyText: gettext('Default'),
>                                deleteEmpty: true,



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