An iOS bridge for sending messages to and from javascript in a UIWebView.
If you like WebViewJavascriptBridge you should also check out WebViewProxy.
WebViewJavascriptBridge is used by a range of companies and projects. This list was just started and is still very incomplete.
- Yardsale
- EverTrue
- Game Insight
- Altralogica
- Flutterby Labs
- JD Media's 鼎盛中华
Are you using WebViewJavascript at your company? Add it and send us a pull request!
Just open the Xcode project and hit run to see ExampleApp run.
To use a WebViewJavascriptBridge in your own project:
- Drag the
WebViewJavascriptBridgefolder into your project.
- In the dialog that appears, uncheck "Copy items into destination group's folder" and select "Create groups for any folders"
-
Import the header file:
#import "WebViewJavascriptBridge.h"
-
Instantiate a UIWebView and a WebViewJavascriptBridge:
UIWebView* webView = [[UIWebView alloc] initWithFrame:self.window.bounds]; WebViewJavascriptBridge* bridge = [WebViewJavascriptBridge bridgeForWebView:webView handler:^(id data, WVJBResponseCallback responseCallback) { NSLog(@"Received message from javascript: %@", data); responseCallback(@"Right back atcha"); }];
-
Go ahead and send some messages from ObjC to javascript:
[bridge send:@"Well hello there"]; [bridge send:[NSDictionary dictionaryWithObject:@"Foo" forKey:@"Bar"]]; [bridge send:@"Give me a response, will you?" responseCallback:^(id responseData) { NSLog(@"ObjC got its response! %@ %@", responseData); }];
-
Finally, set up the javascript side:
document.addEventListener('WebViewJavascriptBridgeReady', function onBridgeReady(event) { var bridge = event.bridge bridge.init(function(message, responseCallback) { alert('Received message: ' + message)
if (responseCallback) { responseCallback("Right back atcha") } }) bridge.send('Hello from the javascript') bridge.send('Please respond to this', function responseCallback(responseData) { console.log("Javascript got its response", responseData) }) }, false)
[WebViewJavascriptBridge bridgeForWebView:(UIWebView*)webview webViewDelegate:(UIWebViewDelegate*)webViewDelegate handler:(WVJBHandler)handler]
Create a javascript bridge for the given UIWebView.
The WVJBResponseCallback will not be nil if the javascript expects a response.
Optionally, pass in webViewDelegate:(UIWebViewDelegate*)webViewDelegate if you need to respond to the UIWebView's lifecycle events.
Example:
[WebViewJavascriptBridge bridgeForWebView:webView handler:^(id data, WVJBResponseCallback responseCallback) {
NSLog(@"Received message from javascript: %@", data);
if (responseCallback) {
responseCallback(@"Right back atcha");
}
}]
[WebViewJavascriptBridge bridgeForWebView:webView webViewDelegate:self handler:^(id data, WVJBResponseCallback responseCallback) { /* ... */ }];
Send a message to javascript. Optionally expect a response by giving a responseCallback block.
Example:
[bridge send:@"Hi"];
[bridge send:[NSDictionary dictionaryWithObject:@"Foo" forKey:@"Bar"]];
[bridge send:@"I expect a response!" responseCallback:^(id responseData) {
NSLog(@"Got response! %@", responseData);
}];
Register a handler called handlerName. The javascript can then call this handler with WebViewJavascriptBridge.callHandler("handlerName").
Example:
[bridge registerHandler:@"getScreenHeight" handler:^(id data, WVJBResponseCallback responseCallback) {
responseCallback([NSNumber numberWithInt:[UIScreen mainScreen].bounds.size.height]);
}];
[bridge callHandler:(NSString*)handlerName data:(id)data responseCallback:(WVJBResponseCallback)callback]
Call the javascript handler called handlerName. Optionally expect a response by giving a responseCallback block.
Example:
[bridge callHandler:@"showAlert" data:@"Hi from ObjC to JS!"];
[bridge callHandler:@"getCurrentPageUrl" data:nil responseCallback:^(id responseData) {
NSLog(@"Current UIWebView page URL is: %@", responseData);
}];
document.addEventListener('WebViewJavascriptBridgeReady', function onBridgeReady(event) { ... }, false)
Always wait for the WebViewJavascriptBridgeReady DOM event.
Example:
document.addEventListener('WebViewJavascriptBridgeReady', function(event) {
var bridge = event.bridge
// Start using the bridge
}, false)
Initialize the bridge. This should be called inside of the 'WebViewJavascriptBridgeReady' event handler.
The messageHandler function will receive all messages sent from ObjC via [bridge send:(id)data] and [bridge send:(id)data responseCallback:(WVJBResponseCallback)responseCallback].
The response object will be defined if if ObjC sent the message with a WVJBResponseCallback block.
Example:
bridge.init(function(data, responseCallback) {
alert("Got data " + JSON.stringify(data))
if (responseCallback) {
responseCallback("Right back atcha!")
}
})
Send a message to ObjC. Optionally expect a response by giving a responseCallback function.
Example:
bridge.send("Hi there!")
bridge.send("Hi there!", function(responseData) {
alert("I got a response! "+JSON.stringify(responseData))
})
Register a handler called handlerName. The ObjC can then call this handler with [bridge callHandler:"handlerName" data:@"Foo"] and [bridge callHandler:"handlerName" data:@"Foo" responseCallback:^(id responseData) { ... }]
Example:
bridge.registerHandler("showAlert", function(data) { alert(data) })
bridge.registerHandler("getCurrentPageUrl", function(data, responseCallback) {
responseCallback(document.location.toString())
})
Note: iOS4 support has not yet been tested in v2.
WebViewJavascriptBridge uses NSJSONSerialization by default. If you need iOS 4 support then you can use JSONKit, and add USE_JSONKIT to the preprocessor macros for your project.
- @marcuswestin Marcus Westin
- @psineur Stepan Generalov
- @sergiocampama Sergio Campamá
- @stringbean Michael Stringer
- @tanis2000 Valerio Santinelli
- @drewburch Andrew Burch
- @pj4533 PJ Gray