Validation in gallery Control in canvas App

[JayashreeKrish]

1) I have a gallery , by default I am not able to see the first row, I have to click "+" to see first row. How can I make it visisble on the load of the page ?

I have to click "+" for this to appear 

2) The code in my Save &Close button is 

Once I click , the values are stored in a string and sent to another screen,

Set(AllPrincipalString,Concat(Gallery1.AllItems,Concatenate(TextInput1.Text,"; ",TextInput2.Text,"; ",TextInput3.Text,"; ",TextInput4.Text,"; ",TextInput5.Text,"; ",TextInput6.Text,"; ",TextInput7.Text,"; ",TextInput8.Text,"; ",TextInput9.Text," | ")));

Notify("Principal Added successfully!",NotificationType.Success);

Navigate(Screen1,ScreenTransition.Cover);

But I want the user to user to prevent from submitting if my TextInput1.Text, is empty how can i do that ?

[JayashreeKrish]

I tried with 

ForAll(Gallery1.AllItems,If(Not(IsBlank(TextInput1.Text)),Edit,Disabled))

in DisplayMode of Button

But it shows - Enum expected

[rubin_boer]

Hi @JayashreeKrish when you create the collection for the gallery, add blanks to it. By default, your gallery is empty and i assume you user collect to add the rows. 

This will add a row with blank for two items

ClearCollect(colMyInput,{p_name:Blank(), p_title:Blank()})

add that to the OnVisible property of the screen. you will get this when the screen opens

Now for the second part. you are using a gallery, is the plan to have more than one entry? once i know this i will suggest a way forward. your variable collecting the string that way from the gallery is a bit troublesome, id like to get more into that.

hope this helps you

[JayashreeKrish]

Thanks much @rubin_boer 

My Question 1 is answered

[rubin_boer · Accepted solution]

@JayashreeKrish may i suggest you set the displaymode of the button based on your rule.

Select the display button and set its display mode to

If(
    CountRows(
        Filter(
            YourGallery.AllItems,
            IsBlank(yourTextBox)
        )
    ) > 0,
    DisplayMode.Disabled,
    DisplayMode.Edit
)

now when its empty the user will get a disabled button

and once there is data it will be active

hope thi shelps

[JayashreeKrish]

For my Question 2,

Once my gallery is loaded,

If I add value in Principal Name field , I should be able to save all the Principal Names in  a field in Screen 1 separated by semicolon 

If it is empty I should  I should  not be able to save anything in   a field in Screen 1 , it should be blank as it is 

[JayashreeKrish]

Thanks much @rubin_boer  

Both my questions are answered 🙂

[rubin_boer]

@JayashreeKrish you may want to investigate to save the collection itself and then patch your datasource with the collection. a good place will be the "+" icon. have a look at this whihc is a very good piece by @mdevaney PATCH Multiple Records In Power Apps 10x Faster - Matthew Devaney

[JayashreeKrish]

Hi @rubin_boer  

For my first question.

I have a canvas app with two screen

On screen 1, if i click on a button it will go to screen 2 which is having gallery

In screen 2  i have a gallery , with clear , save&close , close button.

on load of screen it should show the first entry if it is blank  (it is showing since i put the below code)

But  if I  had entered some value ,

when i come to screen 2 from screen 1 , it should show the value  

But it is not shown as expected when i use the below code

If I use   the below it is always blank - ClearCollect(colMyInput,{p_name:Blank(), p_title:Blank()})

How do I avoid that ?

[anupp]

is it possible to do validation for item level in gallery.