Computed field

[selobu]

it's posible to define computed fields?

[albanm]

I am not sure I understand. Do you mean that you want to extend the schema dynamically ? vjsf does not guarantee that it will react property to any kind of dynamic change to the schema. In this case it is best to recreate the component instance.

[selobu]

Some forms could define computed fields based on another input on the same form. The computed fields should be readonly and have to evaluate expressions in a secure way by using a parser as peggy https://peggyjs.org/online.html, also I guess the computed field should evaluate simple tokens like COMA, IF, SUM, MINUS, and so on.

[albanm]

I don't know if this belongs to the scope of vjsf or if it should be done in the wrapping vue code. It feels a little bit like reinventing the wheel. Maybe having a readonly field in the form, and a computed property in vue whose setter writes into the model. Or using a slot.

Le lun. 14 mars 2022 à 23:16, Sebastian Lopez Buritica < @.***> a écrit :

Some forms could define computed fields based on another input on the same form. The computed fields should be readonly and have to evaluate expressions in a secure way by using a parser as peggy https://peggyjs.org/online.html, also I guess the computed field should evaluate simple tokens like COMA, IF, SUM, MINUS, and so on.

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[semanticarlo]

Hi, I am interested in computed fields as well. Immagine a form with 2 fields:

• name (user edits this)
• IRI (cannot be edited by user)

Can the JSON-schema specify that ID should be equal to "http://my/domain/" + name ?

[semanticarlo]

I tried the following after passing Options: { "evalMethod": "newFunction" } to the form component but it doesn't work

{
    "type": "object",
    "title": "",
    "required": [
        "Name"
    ],
    "properties": {
        "ID": {
            "type": "string",
            "x-display": "hidden",
            "x-fromData": "new Function('return root.Name')"
        },
        "Name": {
            "type": "string",
            "title": "Name "
        }
    }
}