Hides empty groups, shows non empty groups Returns undefined.

Description

This method will hide all groups that have all fields hidden and show all groups that have visible fields. It is used internally when you show/hide fields. You can also call it to update empty groups. If you have following form: let form = new w2form({ name : 'form', formURL : '/server/path', fields: [ { field: 'first_name', type: 'text', required: true, html: { group: 'General' } }, { field: 'last_name', type: 'text', required: true }, { field: 'email', type: 'email' } ], actions: { "save": function (target, data) { this.validate(); }, "reset": function (target, data) { this.clear(); } } }) You can do: w2ui.form.updateEmptyGroups()