Mandatory field for list


I created a custom list, to be used on opportunity form.
This field has to be mandatory. But the problem is that there is always a field that is selected (the first option).
So even if the user forgets to choose the correct option, the first option will be selected.
What I need is :
First option has to be blank and when user validates the form, it must display the error message, saying that field can’t be empty.

I googled this but couldn’t find anything, which I find surprising.

Could somebody please help me ?

Thanks a lot.


You can edit the dropdown list options from admin and add the blank option into a list.
Admin->Dropdown Editor and select the List that you have used in your field.

Thanks, but no, I’m not able to add any blank option…
I’m getting “undefined” alert box and I’m not able to save it.

Could you please be more specific ?
Thanks a lot.

“Undefined” means, You might have incorrect file permission. That you or your server admin can fix it.
Here is the documentation about file permission

Another way to add value in your dropdown is by adding value in files directly.
and search list name of the option that you are trying and add the first option as blank in that array.

for example :

  '' => '',
1 Like

Great ! it worked. Thanks a lot.

By the way, I can SSH my server but I’m not able to change owner…

I made a test on just one file :

chown www-data:www-data TreeData.php
returns : chown: changing ownership of ‘TreeData.php’: Operation not permitted

And :
sudo chown www-data:www-data TreeData.php
asks me for my password, and then returns this :
birdybadmin is not in the sudoers file. This incident will be reported.

So I was not able to change owner on my files, which leads to errors in the crm.

I have another issue about mail settings, would you be ok to help me if I open a new thread ?
That’s the only thing not working and I would be glad to have some help.
Thanks again !