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Validation in gallery Control in canvas App

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Posted on by JayashreeKrish

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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 ?

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Building Power Apps

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JayashreeKrish 270 on at

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I tried with
ForAll(Gallery1.AllItems,If(Not(IsBlank(TextInput1.Text)),Edit,Disabled))
in DisplayMode of Button
But it shows - Enum expected

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rubin_boer 4,843 Super User 2024 Season 1 on at

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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

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JayashreeKrish 270 on at

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Thanks much @rubin_boer
My Question 1 is answered

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rubin_boer 4,843 Super User 2024 Season 1 on at

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@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

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JayashreeKrish 270 on at

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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

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JayashreeKrish 270 on at

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Thanks much @rubin_boer
Both my questions are answered 🙂

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rubin_boer 4,843 Super User 2024 Season 1 on at

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@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

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JayashreeKrish 270 on at

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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 ?

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anupp 2 on at

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

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rubin_boer 4,843 Super User 2024 Season 1 on at

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Hi there, may I suggest you open another topic you will be helped quicker this way.

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