Modale validation

[martinl90743871]

Hi All,

Is there a way to have a custom function when a user click on the ok button of a modal?
I'd like to validate that an edit-field is filled before exiting the modal and if the validation is not correct, show a new message in red inside the modal to show where is the problem (as the form on Internet)

Currently, I have an option by saving the elements and show a new modal if the validation doesn't pass, but I would prefer to do it by binding or something similar...

Thank you
Martin

[johnrellis · Accepted solution]

You can enable or disable the action button of the dialog by setting the "actionBinding" parameter to a property binding:

    local result = LrDialogs.presentModalDialog {title = "My Dialog",

        contents = controls,

        actionBinding = {enabled = {bind_to_object = prop,

            key = "actionEnabled"}}}

You can use more complicated bindings created by LrBinding, e.g. to call a function that evaluates a more complicated condition.

[martinl90743871]

Sounds a good solution to me 🙂 Thank

A bit less interactive than what I'd like to do but it's still good.

Thank you John.

[martinl90743871]

I just made my tests.
It works with checkbox or so. But when I have a radio button, it does a strange stuff.
If I select an Item, it remove the result as soon as I click on it and I have to click again to get it.

local f = LrView.osFactory()

local p = LrBinding.makePropertyTable( context )

local res = LrDialogs.presentModalDialog {

    title = title,

    contents = f:row {

      fill_horizontal = 1,

      spacing = f:control_spacing(),

      bind_to_object = p,

      f:popup_menu {

        fill_horizontal = 1,

        items = items,

        value = bind 'selection',

      },

    },

    actionBinding = {enabled = {bind_to_object = p,key = "selection"}}

  }

-> The button ok is then always active... Did I a mistake?

[johnrellis]

Here's a script that works as expected:

local LrBinding = import "LrBinding"
local LrDialogs = import "LrDialogs"
local LrFunctionContext = import "LrFunctionContext"
local LrView = import "LrView"
local bind = LrView.bind
LrFunctionContext.callWithContext ("test", function (context)
    local f = LrView.osFactory ()
    local p = LrBinding.makePropertyTable (context)
    local res = LrDialogs.presentModalDialog {title = "Test",
        contents = f:row {bind_to_object = p,
        f:popup_menu {value = bind ("selection"),
            items = {{title = "A", value = "A"}, {title = "B", value = "B"}}}},
        actionBinding = {enabled = LrBinding.keyIsNotNil ("selection", p)}}
    end)

The problem with your test was that actionBinding.enabled was expecting a binding that yielded the boolean values true or false.  While in most places in Lua and the LR SDK, you can pass nil and non-nil values where booleans are expected, there are a few places that doesn't work, and this appears to be one of them.

[martinl90743871]

Thank you John!
Thhat's working perfectly!!

All the best