WebViewJavascriptBridge.js.txt
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;(function() {
if (window.WebViewJavascriptBridge) { return }
var messagingIframe
var sendMessageQueue = []
var receiveMessageQueue = []
var messageHandlers = {}
var CUSTOM_PROTOCOL_SCHEME = 'wvjbscheme'
var QUEUE_HAS_MESSAGE = '__WVJB_QUEUE_MESSAGE__'
var responseCallbacks = {}
var uniqueId = 1
function _createQueueReadyIframe(doc) {
messagingIframe = doc.createElement('iframe')
messagingIframe.style.display = 'none'
doc.documentElement.appendChild(messagingIframe)
}
function init(messageHandler) {
if (WebViewJavascriptBridge._messageHandler) { throw new Error('WebViewJavascriptBridge.init called twice') }
WebViewJavascriptBridge._messageHandler = messageHandler
var receivedMessages = receiveMessageQueue
receiveMessageQueue = null
for (var i=0; i<receivedMessages.length; i++) {
_dispatchMessageFromObjC(receivedMessages[i])
}
}
function send(data, responseCallback) {
_doSend({ data:data }, responseCallback)
}
function registerHandler(handlerName, handler) {
messageHandlers[handlerName] = handler
}
function callHandler(handlerName, data, responseCallback) {
_doSend({ handlerName:handlerName, data:data }, responseCallback)
}
function _doSend(message, responseCallback) {
if (responseCallback) {
var callbackId = 'cb_'+(uniqueId++)+'_'+new Date().getTime()
responseCallbacks[callbackId] = responseCallback
message['callbackId'] = callbackId
}
sendMessageQueue.push(message)
messagingIframe.src = CUSTOM_PROTOCOL_SCHEME + '://' + QUEUE_HAS_MESSAGE
}
function _fetchQueue() {
var messageQueueString = JSON.stringify(sendMessageQueue)
sendMessageQueue = []
return messageQueueString
}
function _dispatchMessageFromObjC(messageJSON) {
setTimeout(function _timeoutDispatchMessageFromObjC() {
var message = JSON.parse(messageJSON)
var messageHandler
if (message.responseId) {
var responseCallback = responseCallbacks[message.responseId]
if (!responseCallback) { return; }
responseCallback(message.responseData)
delete responseCallbacks[message.responseId]
} else {
var responseCallback
if (message.callbackId) {
var callbackResponseId = message.callbackId
responseCallback = function(responseData) {
_doSend({ responseId:callbackResponseId, responseData:responseData })
}
}
var handler = WebViewJavascriptBridge._messageHandler
if (message.handlerName) {
handler = messageHandlers[message.handlerName]
}
try {
handler(message.data, responseCallback)
} catch(exception) {
if (typeof console != 'undefined') {
console.log("WebViewJavascriptBridge: WARNING: javascript handler threw.", message, exception)
}
}
}
})
}
function _handleMessageFromObjC(messageJSON) {
if (receiveMessageQueue) {
receiveMessageQueue.push(messageJSON)
} else {
_dispatchMessageFromObjC(messageJSON)
}
}
window.WebViewJavascriptBridge = {
init: init,
send: send,
registerHandler: registerHandler,
callHandler: callHandler,
_fetchQueue: _fetchQueue,
_handleMessageFromObjC: _handleMessageFromObjC
}
var doc = document
_createQueueReadyIframe(doc)
var readyEvent = doc.createEvent('Events')
readyEvent.initEvent('WebViewJavascriptBridgeReady')
readyEvent.bridge = WebViewJavascriptBridge
doc.dispatchEvent(readyEvent)
})();