react-native-macos/Examples/UIExplorer
Luke Miles da9a712a9e Add a injectJavaScript method to the WebView component
Summary:
Currently, < WebView > allows you to pass JS to execute within the view. This works great, but there currently is not a way to execute JS after the page is loaded. We needed this for our app.

We noticed that the WebView had messaging support added (see #9762) . Initially, this seemed like more than enough functionality for our use case - just write a function that's injected on initial load that accepts a message with JS, and `eval()` it. However, this broke once we realized that Content Security Policy can block the use of eval on pages. The native methods iOS provide to inject JS allow you to inject JS without CSP interfering. So, we just wrapped the native methods on iOS (and later Android) and it worked for our use case. The method injectJavaScript was born.

Now, after I wrote this code, I realized that #8798 exists and hadn't been merged because of a lack of tests. I commend what was done in #8798 as it sorely solves a problem (injecting JS after the initial load) and has more features than what I'
Closes https://github.com/facebook/react-native/pull/11358

Differential Revision: D4390425

fbshipit-source-id: 02813127f8cf60fd84229cb26eeea7f8922d03b3
2017-01-06 20:29:02 -08:00
..
UIExplorer Move all header imports to "<React/..>" 2016-11-23 07:58:39 -08:00
UIExplorer-tvOS Apple TV support 2: Xcode projects and CI (scripts/objc-test.sh) 2016-10-05 07:28:44 -07:00
UIExplorer.xcodeproj Redo exported headers and include paths for opensource 2016-12-07 15:28:29 -08:00
UIExplorerIntegrationTests Apple TV support 4: support for input (tvOS focus engine) 2016-12-19 06:28:40 -08:00
UIExplorerUnitTests Add feature to use percentage as value unit 2017-01-02 05:28:30 -08:00
android/app Handle "Never Ask Again" in permissions and add requestMultiplePermissions 2016-11-24 22:43:28 -08:00
js Add a injectJavaScript method to the WebView component 2017-01-06 20:29:02 -08:00
README.md Consolidate Running on Device (Android|iOS) Guides into one 2016-11-06 21:13:32 -08:00

README.md

UIExplorer

The UIExplorer is a sample app that showcases React Native views and modules.

Running this app

Before running the app, make sure you ran:

git clone https://github.com/facebook/react-native.git
cd react-native
npm install

Running on iOS

Mac OS and Xcode are required.

  • Open Examples/UIExplorer/UIExplorer.xcodeproj in Xcode
  • Hit the Run button

See Running on device if you want to use a physical device.

Running on Android

You'll need to have all the prerequisites (SDK, NDK) for Building React Native installed.

Start an Android emulator (Genymotion is recommended).

cd react-native
./gradlew :Examples:UIExplorer:android:app:installDebug
./packager/packager.sh

Note: Building for the first time can take a while.

Open the UIExplorer app in your emulator.

See Running on Device in case you want to use a physical device.

Running with Buck

Follow the same setup as running with gradle.

Install Buck from here.

Run the following commands from the react-native folder:

./gradlew :ReactAndroid:packageReactNdkLibsForBuck
buck fetch uiexplorer
buck install -r uiexplorer
./packager/packager.sh

Note: The native libs are still built using gradle. Full build with buck is coming soon(tm).

Built from source

Building the app on both iOS and Android means building the React Native framework from source. This way you're running the latest native and JS code the way you see it in your clone of the github repo.

This is different from apps created using react-native init which have a dependency on a specific version of React Native JS and native code, declared in a package.json file (and build.gradle for Android apps).