Frontend Funtion - Get Value

Gouds

Just a quick question about Frontend functions. Is it possbile to read a value from a current page? I have a list that records lap times and reports them back to list (Stopwatch). what i would like to do is to be able to copy the data back to a session. (you select the session.id this on the stopwatch sheet.). What i would like to do is take the user selected data, look up the session.id and pass it through the frontend function. Is this possible to look up a value.

The copy works if you maually pass the value into the backend function. Its just the field lookup.

Gouds

I found the solution. When your adding in a Frontend Function you can assign to a form. By doing so it give you options that are form specific and allows you to read data from the current form. With this was able to return back current form data.

lsw-fabian

Most easy way would be via an backend function. - So you trigger an frontend function via the button which will call an backend function and get all the data you want back to your frontend function (stored within 'res').

let template_id = app.get_field_value({0:lsw_tickets.ticket.template});
app.call_backend({lsw_tickets.get_template_information}, template_id).then(
	res => { 
		app.set_field_value({0:lsw_tickets.ticket.description}, res);
	},
	err => { 
		console.log(err);
	}
);

Alternatively, if you only want to achieve this via frontend functions only, you could join (without any additional filters, if you have an n:1 or 1:1 relation) the relation where 'session_id' is located and place the fields you want to copy into your form (make them hidden if you only need to copy the values).
Via frontend function you could now use the placeholders to read values from your hidden fields and use them in another context. I hope you could follow my explanation.
app.set_field_value({0:lsw_tickets.ticket.note}, app.get_field_value({17:lsw_tickets.text_block.text}));

you will find a lot of examples for both cases in applications like lsw_tickets.