Some Important Formula For App Development In PowerApp

Introduction

In this article, I am going to explain some important and useful formula to develop an app in PowerApp.

To fetch the user’s manager properties, first, we need to connect to the Office365Users to PowerApp.

Syntaxes

Mail - Office365Users.Manager(User().Email).Mail

(Where the User().Email is current login user’s email. You can use any other user’s email to get the one’s respected Manager)

Department - Office365Users.MyProfile().Department

Let’s say as an example, I want to show a setting button to only admins, not to the remaining users.

To achieve this, create a SharePoint list for admins, then set a condition on the visibility of a button to check if the user is available in the list to show the button.

Look at the below screenshot to understand better,

Visible - If(User().FullName in Admins.FullNameText, true, false)

onVisible of the screen,

For Current user,

For Manager,

UpdateContext({managerProfile - Office365Users.Manager(Office365Users.MyProfile().Id)})

On button click post the manager column as below,

onSelect

Update a particular record using Patch

Property - OnSelect,

Syntax

Patch('MyList', {ID:IDNum}, {Title: "My new title"})

Explanation

• Patch is a method to update a SharePoint list item, will be trigger onSelect or onChange of button
• ‘MyList’ is a list name
• ID is the SharePoint item’s Id where you want to update
• ‘Title’ is the columns internal name, which you want to update
• "My new title" is user input

To enable/disable a button based on selection:

Property - Display mode,

Syntax

If(IsBlank('MyList Box'.Selected.Value),DisplayMode.View,DisplayMode.Edit)

Explanation

• If Selection is Blank (No Selection), the button will be in disable mode (DisplayMode.View)
• If you select something from dropdown/list box, the button will become enabled (DisplayMode.Edit)
• Where the 'MyList Box' is the selection box

Whenever you are navigated from one screen to another screen based on selection of an item, the below syntax will be used to display the selected item’s property.

Syntax

someGallery.Selected.DisplayName (These are just to get some idea to implement in your applications)

Explanation

• Where the ‘someGallery’ is a gallery with full of list items
• ‘DisplayName’ is one of the properties of the selected item from the ‘someGallery’

Case - When you wish to navigate to a particular named screen from the current screen by clicking a button/Icon, put the below syntax on button’s onSelect property.

Property - onSelect,

Syntax

Navigate(SomeScreenName, ScreenTransition.None)

Explanation

• Where the ‘Navigate’ is an inbuilt function which will use to navigate the screen.
• ‘SomeScreenName’ is the destination screen where you wished to navigate.
• ‘ScreenTransition.None’ is one of the screens to navigate the motion style out of ‘Cover’ and ‘Fade’.

Case - When you want to post input form’s data to a SharePoint list on a particular button click.

Button’s Property - OnSelect,

Syntax

SubmitForm(AddedEditForm);NewForm(AddedEditForm)

Explanation

• Where the ‘SubmitForm’ and ‘NewForm’ are in-built functions which are useful to post data and reset to an empty form after submitting the data respectively.
• ‘AddedEditForm’ is a name of the input edit form, which is the user-defined name.

Case - When you want to delete a selected item from a list box by clicking on a button.

Button’s Property - OnSelect,

Syntax

Remove(MyList, First(Filter(MyList,EmpName=ListBox.Selected.EmpName)))

Explanation

• Where the ‘Remove’ is an inbuilt function which is useful to delete a selected item from the SharePoint list
• ‘MyList’ is a name of the SharePoint list.
• ‘EmpName’ is one of the column’s names and ‘ListBox.Selected.EmpName’ is one of the properties of the selected item from List Box which contains the list of items.
• Where ‘First(Filter(MyList, EmpName=ListBox.Selected.EmpName))’ is filtering the matched records from MyList to the selected item from the List Box. So that it helps to remove the particular item from the list

Button’s Property - OnSelect,

Syntax

Remove(MyList, First(Filter(MyList,ID=Gallery.Selected.ID)))

Explanation

• This is just similar to the above case, except, where we are removing the item by passing a particular ID.

Case - When you want to perform deletion on bulk records by clicking a button.

Button’s Property - OnSelect,

Syntax

ForAll(CollectionForRemove,Remove(MyList, First(Filter(MyList,ID= CollectionForRemove [@ID]))));

• ‘ForAll’ is an inbuilt method as similar to for loop in the JavaScript
• ‘CollectionForRemove’ is a collection of items which you want to delete
• ‘MyList’ is list name where you want to remove the collection of items from
• Where if Collections each record’s ID matched to ‘MyList’ item’s Id, then it will perform the deletion on the respected item.

Case - When you want to display particular categorized items in a gallery.

Gallery’s Property - Items,

Syntax

Filter(MyList,EmployeeName.DisplayName =User().DisplayName) (Where I’m filtering current user’s items)

Explanation

• ‘Filter’ is an inbuilt method used for filtering
• ‘MyList’ is a list name and ‘EmployeeName’ is a columns name, the ‘DisplayName’ is one of the properties of column ‘EmployeeName’
• ‘User().DisplayName’ is the name of the login user
• Where the gallery display only the records if the EmployeeName.DisplayName is matching with current login user’s name.

Case - When you wish to show only unique items on a Gallery/ListBox

Gallery’s Property - Items,

Syntax

Distinct(Filter(MyList,EmployeeName.DisplayName =User().DisplayName),EmployeeName.DisplayName)

Explanation

• ‘Distinct’ is an inbuilt method used for remove duplicate values
• ‘MyList’ is a list name and ‘EmployeeName’ is a columns name, the ‘DisplayName’ is one of the properties of column ‘EmployeeName’
• ‘User().DisplayName’ is the name of the login user
• As per syntax, it will check the unique names in the ‘EmployeeName.DisplayName’ column.

Case - When you want to display Current Date and Time on a label/text field

Label’s Property - Text,

Syntax

Now()
(Ex: DataCardAdminUserValue.Selected.DisplayName & "-" &Now())

Show the only Year,

Text(Now(), "[$-en-US]yyyy")

Case - When you want to highlight selected item from a gallery

Gallery’s Property -TemplateFill,

Syntax

If(Year=SomeGallary.Selected.Year,
RGBA(255, 255, 255, 1),
RGBA(0,0,0,0)
)

Explanation

• ‘Year’ is a column of SharePoint list
• Where it gets highlighted when the list column Year and selected Year from the gallery are matched, else it will show the white color only (this means no fill).

Case - When you want to perform updating on bulk records by clicking a button

Button’s Property -OnSelect,

Syntax

ForAll(CheckedItems,Patch(ChecklistItemsSource,LookUp(ChecklistItemsSource, Id = CheckedItems[@Id]),{Status:"Done"}))

Explanation

• ‘ForAll’ is an inbuilt method similar to for loop in JavaScript
• ‘CheckedItems’ is a collection of items which you want to update
• ‘ChecklistItemsSource’ is list name where you want to update the collection of items from
• If each Collection record’s ID is matched to ‘ChecklistItemsSource’ item’s Id, then it will perform the update action on ‘Status’ column of the respective item with user input ‘Done’.

Case - When you want to perform update on a particular record by clicking a button

Button’s Property - OnSelect,

Syntax

Patch(MyList, {ID:SelectedId}, {Status: "Submitted"});

Explanation

This is just similar to the above case, except, where we are updating the item with user input ‘Submitted’ to Status column by passing a particular ID.

Case - When you want to get a particular item’s property from the collection using an index.

Property - any text/label,

Syntax

Last(FirstN(MyCollection, IndexValue)).ColumnName
(Ex: Last(FirstN(SomeCollection, 1)).ID
Last(FirstN(MyCollectionForEmployeeInfo, 3)).Employee.DisplayName
)

Explanation

• Where I’m getting ID of collection’s item where its index is 1
• Similarly , getting Employee’s display name from collection where its index is 3

Case - When you want to create a collection/Array with filtered items on a button click

Button’s Property:OnSelect/onChange,

Syntax

ClearCollect(UserDefinedCollectionName,Filter(‘ListName’,EmpName=Gallery.Selected.EmpName))
(Ex: ClearCollect(CollectionForselectedQuarter,Filter('Key Initiatives Quarters', YearsFromHeaders_3.Selected.Result = Year&&hrlw=AllAdmins.Selected.Result&&Quarter=Value(Dropdown2.Selected.Value))))

Explanation

• ‘ClearCollect’ is an in built method which will clear an array first then push items
• ‘CollectionForselectedQuarter’ is user defined collection Name
• Where the filtered items are pushing into the respected collection on a button click

Case - When you want to set condition with array length

Edit in advance mode

Syntax

For:Array length greater than 0,

@greater(length(body('Filter_array_1')), 0)

For:Array length is equals to 0,

@equals(length(body('Filter_array_2')), 0)

Expand/Collapse

Case - When you want to hide and show two icons, set variable and use as following:

• Icon1

onselect
UpdateContext({ExpandColapse: !ExpandColapse})

visible
ExpandColapse

• icon2
  
  onselect
  UpdateContext({ExpandColapse: !ExpandColapse})
  
  visible
  Not(ExpandColapse)

• Item
  Not(ExpandColapse&&thisItem.selected )

Case - Filter from entire list on page load

Property - Text,

Syntax

IsBlank(LookUp(MyList,EmployeeName=CurrentUserName&&Year=RunningYear,Employee.DisplayName))

Case: Set variable on an action

OnSelect/onChange

Set(ForUnique,"New Initiative"& "-" &Now());

Explanation

Case - When you want to reset form while using submission with patch methods

Property1: OnSelect,

Syntax

UpdateContext({ResetVar: true});UpdateContext({ResetVar: false})
Property2:Default,
ResetVar

This article will help us to develop any kind of customized applications with the help of the above formula. I hope we can achieve almost any kind of issues or required things with the help of those formulas. This will be helpful to those who want to start with PowerApp. Expect many more things related to Microsoft Flows in my coming articles.

Thank you.