Pass a value to another screen

问题

I have a screen where the user can select an option (not a browse gallery as it does not do what is required).

I want to pass the item the user has selected to the pre-made "DetailScreen1" which is used by the browse gallery.

I looked at the browse screen but did not see how it does it as the navigate onselect event is just normal navigation.

Code:

Navigate(DetailScreen1, ScreenTransition.Fade)

I want to do something like

Navigate(DetailScreen1, ScreenTransition.None {Last(listOfStuff)})

Thanks

回答1:

You can use the third parameter of the Navigate function to pass extra parameters to the context of the screen being navigated to. For example, if your first screen has a dropdown and a text input control that you want to pass the values to the next screen, you can use the following expression:

Navigate(DetailScreen1, ScreenTransition.Fade, { text: TextInput1.Value, dropdownChoice: Dropdown1.Selected.Value })

In the DetailScreen1, you can use those context variables as they'll be available.

Here's an example: the dropdown in the first screen contains a list of sections, and after selecting one you would navigate to another page:

In the "right arrow", we can set the following OnSelect property:

Navigate(ProductsScreen, ScreenTransition.Fade, { selectedSection: Dropdown1.Selected.Value })

In the ProductsScreen, you can then have a gallery whose items are filtered based on that value that was passed:

Items: Filter(AllProducts, Section = selectedSection)

来源：https://stackoverflow.com/questions/39232599/pass-a-value-to-another-screen