How to make a picklist input field as required in a Visualforce page?

Question

Making a picklist field as required means to remove the --None-- option.

A picklist cannot be made required in the field setup.

In a standard detail page, a picklist can be made required by checking the Required checkbox in the page layout. This removes the --None-- option from the picklist options.

However, in a Visualforce page, an picklist cannot be made required with required="true", even if the picklist has a default value specified in setup.

How to make a picklist input field as required in a Visualforce page?

I do not want to resort to dirty Java Script code unless there is no other solution.

Answer 1

With the new Winter 17 release existing custom picklist fields can now be marked as required at a field level.

To create or modify custom picklists:

Picklist on an object — Use the fields area of the object.

Global picklist — From Setup, enter picklist in the Quick Find box, then select > Picklists.

Taken from the release notes for Winter 17.

Answer 2

Use Validation Rule to make it required.

ISBLANK(ShippingCountry) an example .

In visualforce you will need to catch error from validation in controller and use

 ApexPages.addmessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Please select a value'));
     return null;

Then use<apex:Pagemessages/> in Visualforce.