CODEWITHSUNDEEP
c#xamarinxamarin.forms
Matthew
Matthew

Reputation: 527

Xamarin - WebView update URL from another page/view

I have a very basic tabbed application On page one is a web view using Xamarin.Forms

 <WebView x:Name="webview1" IsVisible="true" Source="" ></WebView>

I can update the URL of this view from the .cs code behind using for example

 webview1.Source = "http://www.microsoft.com"

I have a second tab which I'm using for settings/additional info. On this second page I have a button which on click I want to reset the web view on Page 1 to a new Url / updates the Source.

Just trying to reference it on second page tells me I can't due to protection level and an object reference for a static item is required.

updated:

public partial class launcher5Page : ContentPage
{
    public launcher5Page()
    {
        InitializeComponent();

        webview1.Source = "web address here";
    }

    public static bool changeURL(string urlString)
    {
        webview1.Source = urlString;
        return true;
    }
}

Still getting Error CS0120: An object reference is required to access non-static member

Upvotes: 4

Views: 3149

Answers (2)

hvaughan3
hvaughan3

Reputation: 11105

I would suggest using the MessagingCenter for such a job. Then you could do this:

public partial class launcher5Page : ContentPage {

    public launcher5Page() {
        InitializeComponent();

        webview1.Source = "web address here";

        /* Normally you want to subscribe in OnAppearing and unsubscribe in OnDisappearing but since another page would call this, we need to stay subscribed */
        MessagingCenter.Unsubscribe<string>(this, "ChangeWebViewKey");
        MessagingCenter.Subscribe<string>(this, "ChangeWebViewKey", newWebViewUrl => Device.BeginInvokeOnMainThread(async () => {
            webview1.Source = newWebViewUrl;
        }));
    }
}

Then on your other page:

 Xamarin.Forms.MessagingCenter.Send("https://www.google.com", "ChangeWebViewKey");

Upvotes: 3

Glubus
Glubus

Reputation: 2855

Your changeURL method is marked static, meaning that it cannot use anything that isn't marked static. Learn more about what static means..

Since the class launcher5Page is a partial class, one imagines that the webview1 variable used in the snippet is defined in the different parts of the class. webview1 is called a member of class launcher5Page as it is defined outside of any method, and inside the class.

Your solution: remove the static keyword from your changeURL method, or make the webview1 member static so that other static members such as changeURL can use it.

public **partial** class launcher5Page : ContentPage
{
    public launcher5Page()
    {
        InitializeComponent();

        webview1.Source = "web address here";
    }

    public **static** bool changeURL(string urlString)
    {
        **webview1**.Source = urlString;
        return true;
    }
}

Also all of this has absolutely nothing to do with Xamarin, other than Xamarin being a set of libraries written in c#. Your problem lies completely in your lack of knowledge of the c# language.

Upvotes: 1

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