Xamarin forms: How to open a ContentPage from a ContentView?

Question

Xamarin forms: How to open a ContentPage from a ContentView?

Sreejith Sree 1,251

I have a Xamarin.forms.Maps in a ContentView and I am using that view in a listview. I need to open a new page when clicking the map.

I tried like below:

MapClicked="MapClicked"  

private async void MapClicked(object sender, MapClickedEventArgs e)  
{  
	var item = (History)((Map)sender).BindingContext;  
	await Navigation.PushModalAsync(new Pages.Page1());  
}

When I tap the map these lines are triggering, but Page1 is not opening. So what is the exact way to open a ContentPage from a ContentView?

Reference: https://learn.microsoft.com/en-us/answers/questions/205619/xamarin-forms-how-to-bind-the-position-value-of-xa.html

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Answer 1

Alessandro Caliaro 4,196

            await Application.Current.MainPage.Navigation.PushAsync(new Pages.Page1());

Sreejith Sree 1,251 Reputation points

2021-01-11T10:26:05.787+00:00

I am getting below exception.
Alessandro Caliaro 4,196 Reputation points

2021-01-11T10:28:19.753+00:00
You have not defined a NavigationPage. How do you open your Map Page?

You must have something like

Application.MainPage = new NavigationPage(new MyMapPage());
Sreejith Sree 1,251 Reputation points

2021-01-11T11:16:55.687+00:00

I have defined NavigationPage in App.xaml.cs. When I click the map, the code execution is triggering on page1 constructor. But the UI is not changing.
Alessandro Caliaro 4,196 Reputation points

2021-01-11T11:17:42.363+00:00

can you create a sample on github?
Sreejith Sree 1,251 Reputation points

2021-01-11T11:28:32.037+00:00

I am using Navigation.PushModalAsync on all pages. I think that is the issue. Should I change all to Navigation.PushAsync? When I use the NavigationPage, By default, a title bar is showing on the top. I don't need that, is there a way to disable it?

Alessandro Caliaro 4,196

you can try

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"  
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"  
             xmlns:local="clr-namespace:NavigationDemo"  
             x:Class="NavigationDemo.MainPage"  
             NavigationPage.HasNavigationBar="false">

Sreejith Sree 1,251

Everything is working fine except confirm exit prompt. I have added the below code on my home page to show the confirm exit alert when clicking the back button when the user is on the home page. This feature is not working. Any comment?

protected override bool OnBackButtonPressed()
{
    bool value = true;
    var i = this.Children.IndexOf(this.CurrentPage);
    if (i == 0)
    {
        if (AcceptBack)
            return false;
        PromptForExit();
        value = true;
    }
    else
    {
        CurrentPage = Children[0];
        value = true;
    }
    return value;
}

private async void PromptForExit()
{
    if (await DisplayAlert("Confirm to Quit?", "Are you sure you want to quit?", "Yes", "No"))
    {
        AcceptBack = true;
        EmulateBackPressed();
    }
}

Alessandro Caliaro 4,196 Reputation points

2021-01-11T15:43:19.22+00:00

@Sreejith Sree this in another problem.

I suggest to open another issue

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Xamarin forms: How to open a ContentPage from a ContentView?

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