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Thread: Generate dynamic control in xaml

  1. #1

    Thread Starter
    Lively Member FunkySloth's Avatar
    Join Date
    Aug 2016
    Posts
    91

    Generate dynamic control in xaml

    Hi Guys,

    Does anyone have sample on how to generate a dynamic control base on return type from database. I was able to get the data, however i have no idea how to generate the dynamic controls in xaml, this is a survey type application.

    I got this kind of Models:

    Code:
    Public class Question
    {
         public int Id { get; set; }
         public string description { get; set; }
         public List<Answer> Answers { get; set; }
    }
    
    public class Answer
    {
        public int Id { get; set; }
        public int questionId { get; set; }
        public string description { get; set; }
        public string controlType { get; set; }
    }
    The output could be:

    Question Description
    - RadioButton
    - RadioButton

    Question Description
    - Textbox

    Question Description
    - Dropdown

    I am new on how the structure of xamarin works.

    Thank you
    Last edited by FunkySloth; Mar 22nd, 2022 at 07:51 AM.

  2. #2
    Lively Member
    Join Date
    Apr 2022
    Posts
    65

    Re: Generate dynamic control in xaml

    Uh...no but it needs to be protected to be thread safe.

  3. #3

    Re: Generate dynamic control in xaml

    How are you planning to handle the generation of dynamic controls in XAML based on the return type from the database, particularly considering the structure of your Xamarin application?

  4. #4
    PowerPoster techgnome's Avatar
    Join Date
    May 2002
    Posts
    34,621

    Re: Generate dynamic control in xaml

    Chat GPT Prompt:
    Is it possible to dynamically create XAML controls in Xamarin? Say I read data from a database, and based on that, I want to create a couple of controls dynamically to display the data.
    Response:
    XAML controls in Xamarin are typically defined in the XAML markup and are static in nature. However, you can achieve a similar dynamic behavior by creating the XAML elements dynamically in code-behind. Here's a high-level overview of how you can approach this:

    Define a Placeholder Container in XAML:
    In your XAML file, define a container (e.g., StackLayout, Grid, etc.) that will act as a placeholder for your dynamically created controls.
    xaml Code:
    1. <StackLayout x:Name="dynamicControlsContainer">
    2.     <!-- Other static controls can be defined here -->
    3. </StackLayout>

    Read Data from Database:

    Retrieve the data from your database.
    Create XAML Elements Dynamically in Code-Behind:

    In your code-behind file (C#), dynamically create XAML elements based on the data.

    C# Code:
    1. // Assuming you have a list of strings from the database
    2. List<string> dataFromDatabase = GetDataFromDatabase();
    3.  
    4. foreach (string dataItem in dataFromDatabase)
    5. {
    6.     // Create a Label dynamically
    7.     Label dynamicLabel = new Label
    8.     {
    9.         Text = dataItem,
    10.         FontSize = 16,
    11.         // Set other properties as needed
    12.     };
    13.  
    14.     // Add the dynamically created Label to the container defined in XAML
    15.     dynamicControlsContainer.Children.Add(dynamicLabel);
    16. }
    Update UI:
    Ensure to refresh or update the UI to reflect the changes.
    This approach involves dynamically creating instances of Xamarin.Forms controls in the code-behind file and adding them to the container you defined in XAML. The XAML markup provides a placeholder, and the actual controls are created and added at runtime.

    While this achieves dynamic control creation, keep in mind that complex UI scenarios might be better handled using a more MVVM (Model-View-ViewModel) architecture, where you bind your data to a collection and let Xamarin.Forms handle the UI updates automatically.
    -tg
    * I don't respond to private (PM) requests for help. It's not conducive to the general learning of others.*
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