Synchronize SelectedItem between two lists

2 posts, 0 answers
  1. Breno
    Breno avatar
    2 posts
    Member since:
    Dec 2016

    Posted 21 Mar 2017 Link to this post

    Hello everyone!

    I’ve created two RadListView on a MasterDetailPage (Xamarin Forms), one on master (side menu) and another on detail page. When I select an item on master, I expect a visible selection on detail item. Both lists have the same items, so that’s the reason that I want to synchronize them. 

    My problem is when I tap an Item on master’s list, I can’t mirror the selection (selectedItem) on Detail’s list. I expect a visible selection on detail item, once I tap the correspondent on master. If I tap an item on detail, it’s visibly selected. If I tap again on the same item, it’s unselected, and these behaviors are ok.

    I tried using the article’s solution below, but the behavior that I want is to keep the item selected once I tap the item on master.

    Let me show some code… The binding was made at code-behind, in the ViewModel:

    this.SetBinding<IMenuPageViewModel>(DepententListView.SelectedItemProperty, vm => vm.SelectedDependent, BindingMode.TwoWay);

    This one is the Property's ViewModel:

    public IUser SelectedDependent
          get { return _selectedDependent; }
            if (_selectedDependent != value)
              _selectedDependent = value;


    And this one is the method that I try to change the selection:
    public void ChangeDependent(IUser dependent)
       // I expect the item selection change here...
       this.SelectedDependent = dependent;

       // Trying force change...

    In the beginning, I thought the RadListView had a bug, but I send this to clarify if in fact is. In Xamarin.Forms’ ListView works fine.

    Can anyone help me with this issue?



  2. Rosy Topchiyska
    Rosy Topchiyska avatar
    586 posts

    Posted 24 Mar 2017 Link to this post

    Hi Beno,

    Thank you for contacting us.

    You can update the listview selected items programmatically by modifying the SelectedItems collection. Unfortunately, there is an issue on Android and adding items to the collection does not update the visual state of the items in the listview. I have logged this issue in our feedback portal where you can track its status. I have attached a sample that demonstrates how this could work on iOS. Please, take a look and let us know if you have further questions.

    Rosy Topchiyska
    Telerik by Progress
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