Fixing WebView Navigation in Flutter Apps

WebView is loading my local HTML, but when I click on the links inside the content, it isn’t working. It looks like navigation has been blocked. What can I possibly do to fix this?

I’ll help you with enabling navigation in WebView for your THETA app. This is a common issue when working with WebView components, especially for local HTML content.

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Let me help you with the WebView navigation issue in your Flutter application. This is a common problem when working with WebViews and local HTML content. Here’s how you can fix it:

1. If you’re using Flutter’s WebView widget, you need to enable JavaScript and DOM storage. You’ll also need to set up a WebViewController to handle navigation.

Here’s the basic setup you need:

import 'package:webview_flutter/webview_flutter.dart';

WebViewController controller = WebViewController()
  ..setJavaScriptMode(JavaScriptMode.unrestricted)
  ..setNavigationDelegate(
    NavigationDelegate(
      onNavigationRequest: (NavigationRequest request) {
        // Allow navigation
        return NavigationDecision.navigate;
      },
    ),
  )
  ..loadFile('path/to/your/local/file.html');

// In your widget build method
WebViewWidget(
  controller: controller,
)

2. If you’re loading local HTML content with assets, make sure to:

   • Place your HTML files in the assets folder
   • Declare them in pubspec.yaml
   • Use the correct asset path

3. For loading local assets, your pubspec.yaml should include:

flutter:
  assets:
    - assets/your_html_folder/

4. To handle local resource loading (like images, CSS, or JavaScript files referenced in your HTML), you’ll need to use a base URL and configure navigation delegate:

WebViewController controller = WebViewController()
  ..setJavaScriptMode(JavaScriptMode.unrestricted)
  ..setNavigationDelegate(
    NavigationDelegate(
      onNavigationRequest: (NavigationRequest request) {
        // Handle navigation to other pages or resources
        if (request.url.startsWith('file://') || 
            request.url.startsWith('assets://')) {
          return NavigationDecision.navigate;
        }
        // For external links, you might want to handle differently
        return NavigationDecision.navigate;
      },
    ),
  );

5. For handling external links while keeping internal navigation working:

NavigationDelegate(
  onNavigationRequest: (NavigationRequest request) {
    if (request.url.startsWith('http://') || 
        request.url.startsWith('https://')) {
      // Handle external links
      launchUrl(Uri.parse(request.url));
      return NavigationDecision.prevent;
    }
    // Allow internal navigation
    return NavigationDecision.navigate;
  },
)

If you’re specifically working with RICOH THETA camera WebUI, there is a plugin-specific approach for handling WebUI. The THETA camera typically uses port 8888 for plugin WebUI access. Here’s a relevant link to the WebUI documentation.

Let me know if you need any clarification or have specific requirements for your WebView implementation!