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Anonymous
Not applicable

Making a cascading text inputs

I was wondering if there was a way to do this:

 

When you select a text input, and start typing, another blank text input is generated below. when you begin typing in that newly generate text input, yet another text input is generated below that one.

 

Is this possible? To create dynamic forms, or cascading text input fields?

 

 

2 ACCEPTED SOLUTIONS

Accepted Solutions
Reza
Power Apps
Power Apps

The best way that I know is to add bunch of hidden text boxes, and switch the visibility of them to true once user starts to type in the above text box.

 

We don't have any way to generate controls dynamically at runtime.

View solution in original post

mr-dang
Community Champion
Community Champion

I ran some tests and found some interesting results. The text in a textinput control is tied to the record in the gallery. So Table1 has 100 records and each of those records will maintain its text in the TextInput control even after being filtered.

 

So if you add or remove a record, any text you have typed is unaffected because our scheme is more of a show/hide--this is welcome news.

 

To "remove" a textinput field, collect it to a temporary collection by setting the trashcan icon to:

If(CountRows(Gallery1.AllItems)>1,
    Collect(removed,ThisItem.Number)
)

This means, "As long as there is more than one TextInput field, it's okay to remove a given record." This is important because if you remove every record, you have no buttons left to add new ones.

 

Next, you will need to filter the Gallery more to account for the records removed:

Filter(Table1,Number<=cascade,!(Number exactin removed.Value))

This means, "Show a Number of TextInput controls less than or equal to the cascade variable, yet not including the Numbers you removed."

 

If you want to save the data you put into the TextInput controls, you will need to use ForAll(Gallery1.AllItems,[actions here]).

 

For UX, I recommend that you make the height of this gallery variable--let it adjust as more records are shown:

Gallery1.TemplatePadding*(CountRows(Gallery1.AllItems)+1)
+70*CountRows(Gallery1.AllItems)

Change 70 to whatever your TemplateSize is so that you get the exact spacing you want.

Microsoft Employee
@8bitclassroom

View solution in original post

5 REPLIES 5
Reza
Power Apps
Power Apps

The best way that I know is to add bunch of hidden text boxes, and switch the visibility of them to true once user starts to type in the above text box.

 

We don't have any way to generate controls dynamically at runtime.

Anonymous
Not applicable

Yeah i was affraid that was going to be the only way to do it. Thanks for the response!

This can be done.

 

This is what I'm thinking:

  1. Create Table1 with numbers 1-100 in column Number. Save it and add it to PA as a static datasource.
  2. Change the OnVisible property of the screen to make a variable start at 1: 
    Set(cascade, 1)
  3. Insert a Gallery. Set its items to:
    Filter(Table1,Number<=cascade)
  4. Insert a TextInput control and set its OnSelect or OnChange property to:
    Set(cascade,cascade+1)
  5. You can wrap the formula within a condition where only the last record can add an additional row if it is not blank:
    If(ThisItem.Number=Last(Gallery1.AllItems).Number && !IsBlank(Last(Gallery1.AllItems).TextInput1.Text),
        Set(cascade,cascade+1)
    )
  6. Insert a trashcan icon into the Gallery and set its OnSelect property to:
    Set(cascade,cascade-1)
    That will allow you to remove unwanted rows. 
    Only make it visible if it is the last record or make a condition to only delete if it is the last record.
    If(ThisItem.Number=Last(Gallery1.AllItems).Number,
        Set(cascade,cascade-1)
    )
    Deleting is more complicated because each TextInput is tied to a number and the formula we have right now only subtracts 1 from the table. I would suggest the delete button collect the given Number to another collection and filter Table1 to not show the numbers from that table.

This scheme should populate an additional text input field each time the TextInput is selected or changed--your choice.

 

Let me know how it goes.

 

Edit: the deleting scheme is going to take some more thought--you might end up resetting your TextInput fields if you remove it the way things are right now.

Microsoft Employee
@8bitclassroom
mr-dang
Community Champion
Community Champion

I ran some tests and found some interesting results. The text in a textinput control is tied to the record in the gallery. So Table1 has 100 records and each of those records will maintain its text in the TextInput control even after being filtered.

 

So if you add or remove a record, any text you have typed is unaffected because our scheme is more of a show/hide--this is welcome news.

 

To "remove" a textinput field, collect it to a temporary collection by setting the trashcan icon to:

If(CountRows(Gallery1.AllItems)>1,
    Collect(removed,ThisItem.Number)
)

This means, "As long as there is more than one TextInput field, it's okay to remove a given record." This is important because if you remove every record, you have no buttons left to add new ones.

 

Next, you will need to filter the Gallery more to account for the records removed:

Filter(Table1,Number<=cascade,!(Number exactin removed.Value))

This means, "Show a Number of TextInput controls less than or equal to the cascade variable, yet not including the Numbers you removed."

 

If you want to save the data you put into the TextInput controls, you will need to use ForAll(Gallery1.AllItems,[actions here]).

 

For UX, I recommend that you make the height of this gallery variable--let it adjust as more records are shown:

Gallery1.TemplatePadding*(CountRows(Gallery1.AllItems)+1)
+70*CountRows(Gallery1.AllItems)

Change 70 to whatever your TemplateSize is so that you get the exact spacing you want.

Microsoft Employee
@8bitclassroom
Anonymous
Not applicable

Hey Mr-dang, this seems like an awesome suggestion! I will have to dedicate some time to see if i can get this to work.

 

I see what you're saying though, and can't wait to give this a shot!

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