[webview_flutter] Fix iOS WebView not opening href with target="_blank"

packages/webview_flutter/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.19+6
+
+* Enable opening links that target the "_blank" window (links open in same window).
+
 ## 0.3.19+5
 
 * On iOS, always keep contentInsets of the WebView to be 0.

packages/webview_flutter/android/src/main/java/io/flutter/plugins/webviewflutter/FlutterWebView.java

@@ -48,6 +48,7 @@ public class FlutterWebView implements PlatformView, MethodCallHandler {
     platformThreadHandler = new Handler(context.getMainLooper());
     // Allow local storage.
     webView.getSettings().setDomStorageEnabled(true);
+    webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
 
     methodChannel = new MethodChannel(messenger, "plugins.flutter.io/webview_" + id);
     methodChannel.setMethodCallHandler(this);

packages/webview_flutter/example/test_driver/webview_flutter_e2e.dart

@@ -245,7 +245,7 @@ void main() {
         textDirection: TextDirection.ltr,
         child: WebView(
           key: _globalKey,
-          initialUrl: 'https://flutter.dev/',
+          initialUrl: 'about:blank',
           javascriptMode: JavascriptMode.unrestricted,
           userAgent: 'Custom_User_Agent1',
           onWebViewCreated: (WebViewController controller) {
@@ -263,7 +263,7 @@ void main() {
         textDirection: TextDirection.ltr,
         child: WebView(
           key: _globalKey,
-          initialUrl: 'https://flutter.dev/',
+          initialUrl: 'about:blank',
           javascriptMode: JavascriptMode.unrestricted,
           userAgent: 'Custom_User_Agent2',
         ),
@@ -301,7 +301,7 @@ void main() {
         textDirection: TextDirection.ltr,
         child: WebView(
           key: _globalKey,
-          initialUrl: 'https://flutter.dev/',
+          initialUrl: 'about:blank',
           javascriptMode: JavascriptMode.unrestricted,
           userAgent: 'Custom_User_Agent',
         ),
@@ -315,7 +315,7 @@ void main() {
         textDirection: TextDirection.ltr,
         child: WebView(
           key: _globalKey,
-          initialUrl: 'https://flutter.dev/',
+          initialUrl: 'about:blank',
           javascriptMode: JavascriptMode.unrestricted,
         ),
       ),
@@ -678,6 +678,33 @@ void main() {
     final String currentUrl = await controller.currentUrl();
     expect(currentUrl, 'https://flutter.dev/');
   });
+
+  testWidgets('target _blank opens in same window',
+      (WidgetTester tester) async {
+    final Completer<WebViewController> controllerCompleter =
+        Completer<WebViewController>();
+    final Completer<void> pageLoaded = Completer<void>();
+    await tester.pumpWidget(
+      Directionality(
+        textDirection: TextDirection.ltr,
+        child: WebView(
+          key: GlobalKey(),
+          onWebViewCreated: (WebViewController controller) {
+            controllerCompleter.complete(controller);
+          },
+          javascriptMode: JavascriptMode.unrestricted,
+          onPageFinished: (String url) {
+            pageLoaded.complete(null);
+          },
+        ),
+      ),
+    );
+    final WebViewController controller = await controllerCompleter.future;
+    await controller.evaluateJavascript('window.open("about:blank", "_blank")');
+    await pageLoaded.future;
+    final String currentUrl = await controller.currentUrl();
+    expect(currentUrl, 'about:blank');
+  });
 }
 
 // JavaScript booleans evaluate to different string values on Android and iOS.

packages/webview_flutter/ios/Classes/FlutterWebView.h

@@ -7,7 +7,7 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface FLTWebViewController : NSObject <FlutterPlatformView>
+@interface FLTWebViewController : NSObject <FlutterPlatformView, WKUIDelegate>
 
 - (instancetype)initWithFrame:(CGRect)frame
                viewIdentifier:(int64_t)viewId

packages/webview_flutter/ios/Classes/FlutterWebView.m

@@ -93,6 +93,7 @@ - (instancetype)initWithFrame:(CGRect)frame
 
     _webView = [[FLTWKWebView alloc] initWithFrame:frame configuration:configuration];
     _navigationDelegate = [[FLTWKNavigationDelegate alloc] initWithChannel:_channel];
+    _webView.UIDelegate = self;
     _webView.navigationDelegate = _navigationDelegate;
     __weak __typeof__(self) weakSelf = self;
     [_channel setMethodCallHandler:^(FlutterMethodCall* call, FlutterResult result) {
@@ -398,4 +399,17 @@ - (void)updateUserAgent:(NSString*)userAgent {
   }
 }
 
+#pragma mark WKUIDelegate
+
+- (WKWebView*)webView:(WKWebView*)webView
+    createWebViewWithConfiguration:(WKWebViewConfiguration*)configuration
+               forNavigationAction:(WKNavigationAction*)navigationAction
+                    windowFeatures:(WKWindowFeatures*)windowFeatures {
+  if (!navigationAction.targetFrame.isMainFrame) {
+    [webView loadRequest:navigationAction.request];
+  }
+
+  return nil;
+}
+
 @end

packages/webview_flutter/pubspec.yaml

@@ -1,6 +1,6 @@
 name: webview_flutter
 description: A Flutter plugin that provides a WebView widget on Android and iOS.
-version: 0.3.19+5
+version: 0.3.19+6
 homepage: https://github.com/flutter/plugins/tree/master/packages/webview_flutter
 
 environment: