You could try retrieving extra fields from the same SharePoint list with the same Lookup. Learn more from the sections of this article dedicated to extra fields: Lookup field — Plumsail SharePoint Forms Documentation
It seems I did something wrong. Every change I made in JS they won´t effected my Form.
For Example I did some Test like this:
fd.spRendered(function () {
// This code is executed once the form is rendered
fd.control('Text1').placeholder = "Enter your name";
fd.control('Text2').placeholder = "Enter your name";
fd.control('RichText1').placeholder = "Enter your name";
fd.control('Lookup1').placeholder = "Enter your name";
fd.field('feuerdepot_x0020_vk').value = '1234';
// Populating Resolution Date with the current date when a user sets
// Status field to 'Resolved'
fd.field('Status').$on('change', function (value) {
if (value === 'Resolved') {
fd.field('ResolutionDate').value = new Date();
}
})
});
Nothing from these take any effect in my form.
I have no experience in JS - can you give me a hint.