iframe-proxy | Sunbelt Computer Software

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<!doctype html>
<html><head>
    <meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1.0, maximum-scale=1.0">
	<style type='text/css'>
		html { font-family:Helvetica; color:#222; }
		h1 { color:steelblue; font-size:24px; margin-top:24px; }
		button { margin:0 3px 10px; font-size:12px; }
		.logLine { border-bottom:1px solid #ccc; padding:4px 2px; font-family:courier; font-size:11px; }
</head><body>
	<h1>WebViewJavascriptBridge Demo</h1>
	window.onerror = function(err) {
		log('window.onerror: ' + err)
    function setupWebViewJavascriptBridge(callback) {
        if (window.WebViewJavascriptBridge) { return callback(WebViewJavascriptBridge); }
        if (window.WVJBCallbacks) { return window.WVJBCallbacks.push(callback); }
        window.WVJBCallbacks = [callback];
        var WVJBIframe = document.createElement('iframe');
        WVJBIframe.style.display = 'none';
        WVJBIframe.src = 'https://__bridge_loaded__';
        document.documentElement.appendChild(WVJBIframe);
        setTimeout(function() { document.documentElement.removeChild(WVJBIframe) }, 0)
    setupWebViewJavascriptBridge(function(bridge) {
		var uniqueId = 1
		function log(message, data) {
			var log = document.getElementById('log')
			var el = document.createElement('div')
			el.className = 'logLine'
			el.innerHTML = uniqueId++ + '. ' + message + ':<br/>' + JSON.stringify(data)
			if (log.children.length) { log.insertBefore(el, log.children[0]) }
			else { log.appendChild(el) }
		bridge.registerHandler('testJavascriptHandler', function(data, responseCallback) {
			log('ObjC called testJavascriptHandler with', data)
			var responseData = { 'Javascript Says':'Right back atcha!' }
			log('JS responding with', responseData)
			responseCallback(responseData)
		document.body.appendChild(document.createElement('br'))
		var callbackButton = document.getElementById('buttons').appendChild(document.createElement('button'))
		callbackButton.innerHTML = 'Fire testObjcCallback'
		callbackButton.onclick = function(e) {
			e.preventDefault()
			log('JS calling handler "testObjcCallback"')
			bridge.callHandler('testObjcCallback', {'foo': 'bar'}, function(response) {
				log('JS got response', response)
	<div id='buttons'></div> <div id='log'></div>
</body></html>

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