feat: allow all frame init scripts in plugin

.changes/plugin-all-frame-init-script.md

@@ -0,0 +1,5 @@
+---
+tauri: "minor:feat"
+---
+
+Added `tauri::plugin::Builder::js_init_script_on_all_frames` that allows plugins to add initialization scripts that runs on all frames

.changes/plugin-js-init-script-into-string.md

@@ -0,0 +1,5 @@
+---
+tauri: "minor:enhance"
+---
+
+`tauri::plugin::Builder::js_init_script` now takes `impl Into<String>` instead of `String`

crates/tauri-runtime/src/webview.rs

@@ -376,11 +376,12 @@ impl WebviewAttributes {
   /// It is guaranteed that code is executed before `window.onload`.
   ///
   /// This is executed only on the main frame.
-  /// If you only want to run it in all frames, use [Self::initialization_script_on_all_frames] instead.
+  /// If you only want to run it in all frames, use [`Self::initialization_script_on_all_frames`] instead.
   ///
   /// ## Platform-specific
   ///
-  /// - **Android on Wry:** When [addDocumentStartJavaScript] is not supported,
+  /// - **Windows:** scripts are always added to subframes.
+  /// - **Android:** When [addDocumentStartJavaScript] is not supported,
   ///   we prepend initialization scripts to each HTML head (implementation only supported on custom protocol URLs).
   ///   For remote URLs, we use [onPageStarted] which is not guaranteed to run before other scripts.
   ///
@@ -401,11 +402,12 @@ impl WebviewAttributes {
   /// It is guaranteed that code is executed before `window.onload`.
   ///
   /// This is executed on all frames, main frame and also sub frames.
-  /// If you only want to run it in the main frame, use [Self::initialization_script] instead.
+  /// If you only want to run it in the main frame, use [`Self::initialization_script`] instead.
   ///
   /// ## Platform-specific
   ///
-  /// - **Android on Wry:** When [addDocumentStartJavaScript] is not supported,
+  /// - **Windows:** scripts are always added to subframes.
+  /// - **Android:** When [addDocumentStartJavaScript] is not supported,
   ///   we prepend initialization scripts to each HTML head (implementation only supported on custom protocol URLs).
   ///   For remote URLs, we use [onPageStarted] which is not guaranteed to run before other scripts.
   ///

crates/tauri/src/manager/webview.rs

@@ -143,13 +143,21 @@ impl<R: Runtime> WebviewManager<R> {
         crate::Pattern::Isolation { schema, .. } => {
           crate::pattern::format_real_schema(schema, use_https_scheme)
         }
-        _ => "".to_string(),
+        _ => "".to_owned(),
       },
     }
     .render_default(&Default::default())?;
 
-    let mut all_initialization_scripts: Vec<String> = vec![];
-    all_initialization_scripts.push(
+    let mut all_initialization_scripts: Vec<InitializationScript> = vec![];
+
+    fn main_frame_script(script: String) -> InitializationScript {
+      InitializationScript {
+        script,
+        for_main_frame_only: true,
+      }
+    }
+
+    all_initialization_scripts.push(main_frame_script(
       r"
         Object.defineProperty(window, 'isTauri', {
           value: true,
@@ -163,10 +171,10 @@ impl<R: Runtime> WebviewManager<R> {
           })
         }
       "
-      .to_string(),
-    );
-    all_initialization_scripts.push(self.invoke_initialization_script.to_string());
-    all_initialization_scripts.push(format!(
+      .to_owned(),
+    ));
+    all_initialization_scripts.push(main_frame_script(self.invoke_initialization_script.clone()));
+    all_initialization_scripts.push(main_frame_script(format!(
       r#"
           Object.defineProperty(window.__TAURI_INTERNALS__, 'metadata', {{
             value: {{
@@ -177,45 +185,37 @@ impl<R: Runtime> WebviewManager<R> {
         "#,
       current_window_label = serde_json::to_string(window_label)?,
       current_webview_label = serde_json::to_string(&label)?,
-    ));
-    all_initialization_scripts.push(self.initialization_script(
+    )));
+    all_initialization_scripts.push(main_frame_script(self.initialization_script(
       app_manager,
       &ipc_init.into_string(),
       &pattern_init.into_string(),
       use_https_scheme,
-    )?);
+    )?));
 
-    for plugin_init_script in plugin_init_scripts {
-      all_initialization_scripts.push(plugin_init_script.to_string());
-    }
+    all_initialization_scripts.extend(plugin_init_scripts);
 
     #[cfg(feature = "isolation")]
     if let crate::Pattern::Isolation { schema, .. } = &*app_manager.pattern {
-      all_initialization_scripts.push(
+      all_initialization_scripts.push(main_frame_script(
         IsolationJavascript {
           isolation_src: &crate::pattern::format_real_schema(schema, use_https_scheme),
           style: tauri_utils::pattern::isolation::IFRAME_STYLE,
         }
         .render_default(&Default::default())?
-        .to_string(),
-      );
+        .into_string(),
+      ));
     }
 
     if let Some(plugin_global_api_scripts) = &*app_manager.plugin_global_api_scripts {
-      for script in plugin_global_api_scripts.iter() {
-        all_initialization_scripts.push(script.to_string());
+      for &script in plugin_global_api_scripts.iter() {
+        all_initialization_scripts.push(main_frame_script(script.to_owned()));
       }
     }
 
-    webview_attributes.initialization_scripts.splice(
-      0..0,
-      all_initialization_scripts
-        .into_iter()
-        .map(|script| InitializationScript {
-          script,
-          for_main_frame_only: true,
-        }),
-    );
+    // Prepend `all_initialization_scripts` to `webview_attributes.initialization_scripts`
+    all_initialization_scripts.extend(webview_attributes.initialization_scripts);
+    webview_attributes.initialization_scripts = all_initialization_scripts;
 
     pending.webview_attributes = webview_attributes;
 

crates/tauri/src/plugin.rs

@@ -18,6 +18,7 @@ use serde::{
 };
 use serde_json::Value as JsonValue;
 use tauri_macros::default_runtime;
+use tauri_runtime::webview::InitializationScript;
 use thiserror::Error;
 use url::Url;
 
@@ -50,15 +51,37 @@ pub trait Plugin<R: Runtime>: Send {
   /// Add the provided JavaScript to a list of scripts that should be run after the global object has been created,
   /// but before the HTML document has been parsed and before any other script included by the HTML document is run.
   ///
-  /// Since it runs on all top-level document and child frame page navigations,
-  /// it's recommended to check the `window.location` to guard your script from running on unexpected origins.
-  ///
   /// The script is wrapped into its own context with `(function () { /* your script here */ })();`,
   /// so global variables must be assigned to `window` instead of implicitly declared.
+  ///
+  /// This is executed only on the main frame.
+  /// If you only want to run it in all frames, use [`Plugin::initialization_script_2`] to set that to false.
+  ///
+  /// ## Platform-specific
+  ///
+  /// - **Windows:** scripts are always added to subframes.
+  /// - **Android:** When [addDocumentStartJavaScript] is not supported,
+  ///   we prepend initialization scripts to each HTML head (implementation only supported on custom protocol URLs).
+  ///   For remote URLs, we use [onPageStarted] which is not guaranteed to run before other scripts.
+  ///
+  /// [addDocumentStartJavaScript]: https://developer.android.com/reference/androidx/webkit/WebViewCompat#addDocumentStartJavaScript(android.webkit.WebView,java.lang.String,java.util.Set%3Cjava.lang.String%3E)
+  /// [onPageStarted]: https://developer.android.com/reference/android/webkit/WebViewClient#onPageStarted(android.webkit.WebView,%20java.lang.String,%20android.graphics.Bitmap)
   fn initialization_script(&self) -> Option<String> {
     None
   }
 
+  // TODO: Change `initialization_script` to this in v3
+  /// Same as [`Plugin::initialization_script`] but returns an [`InitializationScript`] instead
+  /// We plan to replace [`Plugin::initialization_script`] with this signature in v3
+  fn initialization_script_2(&self) -> Option<InitializationScript> {
+    self
+      .initialization_script()
+      .map(|script| InitializationScript {
+        script,
+        for_main_frame_only: true,
+      })
+  }
+
   /// Callback invoked when the window is created.
   #[allow(unused_variables)]
   fn window_created(&mut self, window: Window<R>) {}
@@ -242,7 +265,7 @@ pub struct Builder<R: Runtime, C: DeserializeOwned = ()> {
   name: &'static str,
   invoke_handler: Box<InvokeHandler<R>>,
   setup: Option<Box<SetupHook<R, C>>>,
-  js_init_script: Option<String>,
+  js_init_script: Option<InitializationScript>,
   on_navigation: Box<OnNavigation<R>>,
   on_page_load: Box<OnPageLoad<R>>,
   on_window_ready: Box<OnWindowReady<R>>,
@@ -305,14 +328,24 @@ impl<R: Runtime, C: DeserializeOwned> Builder<R, C> {
   /// Sets the provided JavaScript to be run after the global object has been created,
   /// but before the HTML document has been parsed and before any other script included by the HTML document is run.
   ///
-  /// Since it runs on all top-level document and child frame page navigations,
-  /// it's recommended to check the `window.location` to guard your script from running on unexpected origins.
-  ///
   /// The script is wrapped into its own context with `(function () { /* your script here */ })();`,
   /// so global variables must be assigned to `window` instead of implicitly declared.
   ///
   /// Note that calling this function multiple times overrides previous values.
   ///
+  /// This is executed only on the main frame.
+  /// If you only want to run it in all frames, use [`Self::js_init_script_on_all_frames`] instead.
+  ///
+  /// ## Platform-specific
+  ///
+  /// - **Windows:** scripts are always added to subframes.
+  /// - **Android:** When [addDocumentStartJavaScript] is not supported,
+  ///   we prepend initialization scripts to each HTML head (implementation only supported on custom protocol URLs).
+  ///   For remote URLs, we use [onPageStarted] which is not guaranteed to run before other scripts.
+  ///
+  /// [addDocumentStartJavaScript]: https://developer.android.com/reference/androidx/webkit/WebViewCompat#addDocumentStartJavaScript(android.webkit.WebView,java.lang.String,java.util.Set%3Cjava.lang.String%3E)
+  /// [onPageStarted]: https://developer.android.com/reference/android/webkit/WebViewClient#onPageStarted(android.webkit.WebView,%20java.lang.String,%20android.graphics.Bitmap)
+  ///
   /// # Examples
   ///
   /// ```rust
@@ -328,13 +361,46 @@ impl<R: Runtime, C: DeserializeOwned> Builder<R, C> {
   ///
   /// fn init<R: Runtime>() -> TauriPlugin<R> {
   ///   Builder::new("example")
-  ///     .js_init_script(INIT_SCRIPT.to_string())
+  ///     .js_init_script(INIT_SCRIPT)
   ///     .build()
   /// }
   /// ```
   #[must_use]
-  pub fn js_init_script(mut self, js_init_script: String) -> Self {
-    self.js_init_script = Some(js_init_script);
+  // TODO: Rename to `initialization_script` in v3
+  pub fn js_init_script(mut self, js_init_script: impl Into<String>) -> Self {
+    self.js_init_script = Some(InitializationScript {
+      script: js_init_script.into(),
+      for_main_frame_only: true,
+    });
+    self
+  }
+
+  /// Sets the provided JavaScript to be run after the global object has been created,
+  /// but before the HTML document has been parsed and before any other script included by the HTML document is run.
+  ///
+  /// Since it runs on all top-level document and child frame page navigations,
+  /// it's recommended to check the `window.location` to guard your script from running on unexpected origins.
+  ///
+  /// Note that calling this function multiple times overrides previous values.
+  ///
+  /// This is executed on all frames, main frame and also sub frames.
+  /// If you only want to run it in the main frame, use [`Self::js_init_script`] instead.
+  ///
+  /// ## Platform-specific
+  ///
+  /// - **Windows:** scripts are always added to subframes.
+  /// - **Android:** When [addDocumentStartJavaScript] is not supported,
+  ///   we prepend initialization scripts to each HTML head (implementation only supported on custom protocol URLs).
+  ///   For remote URLs, we use [onPageStarted] which is not guaranteed to run before other scripts.
+  ///
+  /// [addDocumentStartJavaScript]: https://developer.android.com/reference/androidx/webkit/WebViewCompat#addDocumentStartJavaScript(android.webkit.WebView,java.lang.String,java.util.Set%3Cjava.lang.String%3E)
+  /// [onPageStarted]: https://developer.android.com/reference/android/webkit/WebViewClient#onPageStarted(android.webkit.WebView,%20java.lang.String,%20android.graphics.Bitmap)
+  #[must_use]
+  pub fn js_init_script_on_all_frames(mut self, js_init_script: impl Into<String>) -> Self {
+    self.js_init_script = Some(InitializationScript {
+      script: js_init_script.into(),
+      for_main_frame_only: false,
+    });
     self
   }
 
@@ -695,7 +761,7 @@ pub struct TauriPlugin<R: Runtime, C: DeserializeOwned = ()> {
   app: Option<AppHandle<R>>,
   invoke_handler: Box<InvokeHandler<R>>,
   setup: Option<Box<SetupHook<R, C>>>,
-  js_init_script: Option<String>,
+  js_init_script: Option<InitializationScript>,
   on_navigation: Box<OnNavigation<R>>,
   on_page_load: Box<OnPageLoad<R>>,
   on_window_ready: Box<OnWindowReady<R>>,
@@ -751,6 +817,13 @@ impl<R: Runtime, C: DeserializeOwned> Plugin<R> for TauriPlugin<R, C> {
   }
 
   fn initialization_script(&self) -> Option<String> {
+    self
+      .js_init_script
+      .clone()
+      .map(|initialization_script| initialization_script.script)
+  }
+
+  fn initialization_script_2(&self) -> Option<InitializationScript> {
     self.js_init_script.clone()
   }
 
@@ -842,12 +915,20 @@ impl<R: Runtime> PluginStore<R> {
   }
 
   /// Generates an initialization script from all plugins in the store.
-  pub(crate) fn initialization_script(&self) -> Vec<String> {
+  pub(crate) fn initialization_script(&self) -> Vec<InitializationScript> {
     self
       .store
       .iter()
-      .filter_map(|p| p.initialization_script())
-      .map(|script| format!("(function () {{ {script} }})();"))
+      .filter_map(|p| p.initialization_script_2())
+      .map(
+        |InitializationScript {
+           script,
+           for_main_frame_only,
+         }| InitializationScript {
+          script: format!("(function () {{ {script} }})();"),
+          for_main_frame_only,
+        },
+      )
       .collect()
   }
 

crates/tauri/src/webview/mod.rs

@@ -638,7 +638,7 @@ impl<R: Runtime> WebviewBuilder<R> {
   /// it's recommended to check the `window.location` to guard your script from running on unexpected origins.
   ///
   /// This is executed only on the main frame.
-  /// If you only want to run it in all frames, use [Self::initialization_script_for_all_frames] instead.
+  /// If you only want to run it in all frames, use [`Self::initialization_script_for_all_frames`] instead.
   ///
   /// ## Platform-specific
   ///
@@ -698,7 +698,7 @@ fn main() {
   /// it's recommended to check the `window.location` to guard your script from running on unexpected origins.
   ///
   /// This is executed on all frames (main frame and also sub frames).
-  /// If you only want to run the script in the main frame, use [Self::initialization_script] instead.
+  /// If you only want to run the script in the main frame, use [`Self::initialization_script`] instead.
   ///
   /// ## Platform-specific
   ///