Chrome extension Native messaging synchronization - javascript

I have problem with Native messaging synchronization on windows. I am trying to synchronize the message between backgroundPage and hostApp. normally, we use native messaging like this:
//popup.js
function appendMessage(text) {
document.getElementById('response').innerHTML += "<p>" + text + "</p>";
}
function sendNativeMessage() {
message = {"command": document.getElementById('input-text').value};
port.postMessage(message);
appendMessage("Sent message: <b>" + JSON.stringify(message) + "</b>");
}
function onNativeMessage(message) {
appendMessage("Received message: <b>" + JSON.stringify(message) + "</b>");
}
function onDisconnected() {
appendMessage("Failed to connect: " + chrome.runtime.lastError.message);
port = null;
updateUiState();
}
function connect() {
var hostName = "com.google.chrome.example.dmtest1";
appendMessage("Connecting to native messaging host <b>" + hostName + "</b>");
port = chrome.runtime.connectNative(hostName);
port.onMessage.addListener(onNativeMessage);
port.onDisconnect.addListener(onDisconnected);
updateUiState();
}
document.addEventListener('DOMContentLoaded', function () {
document.getElementById('connect-button').addEventListener(
'click', connect);
document.getElementById('send-message-button').addEventListener(
'click', sendNativeMessage);
updateUiState();
});
<html>
<head>
<script src='./popup.js'></script>
</head>
<body>
<button id='connect-button'>Connect</button>
<input id='input-text' type='text' />
<button id='send-message-button'>Send</button>
<div id='response'></div>
</body>
</html>
but the sendNativeMessage() and onNativeMessage(..) functions are asynchronous, and I want to make them synchronous. I tried the method below but it failed to get the response data from the host(c++ exe), and it made chrome crash.
function sendNativeMessage() {
var message = {"command": document.getElementById('input-text').value};
port.postMessage(message);
appendMessage("Sent message: <b>" + JSON.stringify(message) + "</b>");
port.onMessage.addListener(function(msg) {
appendMessage("Receive message: <b>" + JSON.stringify(msg) + "</b>");
});
}
How can I do this, is it possible, Any help?

After several days of search and test, I finally found an answer(here: how to handle chrome.runtime.sendNativeMessage() in native app) and solved my problem. I give up the idea about making my callback functions synchronous, I just use another way of communicating between Chrome extension backpage and my local host app. Instead of var port = chrome.runtime.connectNative(hostName);port.onMessage.addListener(onNativeMessage);port.postMessage(message); I used the code below to send and receive data between backpage and hostapp, and it is synchronous:
chrome.runtime.sendNativeMessage(hostName, sendMsg, function(response) {
if (chrome.runtime.lastError) {
alert("ERROR: " + chrome.runtime.lastError.message);
} else {
sendResponse({farewell: ParseJSON(response)});
}
});

Related

how to show an error when in appbrowser does not load error phonegap

i am developing an application and loading an hosted application using the inapp browser plugin cordova-plugin-inappbrowser
I have gotten most of the functionalities to work but i am unable to get the part of loading an error message when he url does not load, it dosent just work and shows me an error message of the url where i have hosted my application instead.
Which could be embarrassing.
please i need help on this
This is what am working with below thanks for ur potential responses
// my child browser code, the main source of my app content
function fire(){
var ref = cordova.InAppBrowser.open('http://####################', '_blank', 'location=no,zoom=no,hardwareback=yes,clearsessioncache=yes,clearcache=no');
var myCallback = function(event) { alert(event.url); }
ref.addEventListener('loadstart', inAppBrowserbLoadStart);
ref.addEventListener('loadstop', inAppBrowserbLoadStop);
ref.addEventListener('loaderror', loadErrorCallBack);
ref.addEventListener('exit', inAppBrowserbClose);
}
function loadErrorCallBack(params) {
$('#status-message').text("");
var scriptErrorMesssage =
"alert('Sorry we cannot open that page. Message from the server is : "
+ params.message + "');"
inAppBrowserRef.executeScript({ code: scriptErrorMesssage }, executeScriptCallBack);
inAppBrowserRef.close();
inAppBrowserRef = undefined;
}
function executeScriptCallBack(params) {
if (params[0] == null) {
$('#status-message').text(
"Sorry we couldn't open that page. Message from the server is : '"
+ params.message + "'");
}
}
Your code is generally fine, but you have no control over the title of the alert() function. You can use some other techniques to display the error message. For example, you can use a div:
function loadErrorCallBack(params) {
$('#status-message').text("");
var scriptErrorMesssage = createMsg('Sorry we cannot open that page. Message from the server is: '
+ params.message);
inAppBrowserRef.executeScript({
code: scriptErrorMesssage
}, executeScriptCallBack);
inAppBrowserRef.close();
inAppBrowserRef = undefined;
}
function createMsg(msg) {
return 'var div = document.createElement("div");'
+ 'div.style.position = "absolute";'
+ 'div.style.top = "50%";'
+ 'div.style.left = "50%";'
+ 'div.style.width = "100px";'
+ 'div.style.height = "100px";'
+ 'div.style.color = "#f00";'
+ 'div.innerHTML = "' + msg + '";'
+ 'document.appendChild(div);'
}

why isn't my casperjs displaying any errors?

var casper = require('casper').create({
logLevel:'deubg',
verbose:true,
});
casper.start(someurl,function(){
not_existing_function();
})
When executing above code, all I see on the screen is debug informations that means very little to me. I am expecting to see some error saying the function being called doesn't exist, but there is not.
I thought it was just the behavior, until I see this.
The question clearly indicates he has got some error message:
ReferenceError: Can't find variable: $
Why can't I see something like this on my screen?
You're likely using PhantomJS 2.x. It has a known bug where some errors are not reported. That includes the class of errors that you're describing.
Also, registering to the various error events of CasperJS/PhantomJS doesn't help in this case, but here they are just in case:
// http://phantomjs.org/api/phantom/handler/on-error.html
phantom.onError = function(msg, trace) {
var msgStack = ['PHANTOM ERROR: ' + msg];
if (trace && trace.length) {
msgStack.push('TRACE:');
trace.forEach(function(t) {
msgStack.push(' -> ' + (t.file || t.sourceURL) + ': ' + t.line + (t.function ? ' (in function ' + t.function +')' : ''));
});
}
console.error(msgStack.join('\n'));
phantom.exit(1);
};
// http://docs.casperjs.org/en/latest/events-filters.html#remote-message
casper.on("remote.message", function(msg) {
this.echo("Console: " + msg);
});
// http://docs.casperjs.org/en/latest/events-filters.html#page-error
casper.on("page.error", function(msg, trace) {
this.echo("Error: " + msg);
// maybe make it a little fancier with the code from the PhantomJS equivalent
});
// http://docs.casperjs.org/en/latest/events-filters.html#resource-error
casper.on("resource.error", function(resourceError) {
this.echo("ResourceError: " + JSON.stringify(resourceError, undefined, 4));
});
// http://docs.casperjs.org/en/latest/events-filters.html#page-initialized
casper.on("page.initialized", function(page) {
// CasperJS doesn't provide `onResourceTimeout`, so it must be set through
// the PhantomJS means. This is only possible when the page is initialized
page.onResourceTimeout = function(request) {
console.log('Response Timeout (#' + request.id + '): ' + JSON.stringify(request));
};
});
You can run something like eslint or jshint over the script to catch syntax errors and you can run your script in PhantomJS 1.9.8/1.9.7 in order to catch these sort of errors.

How to use Rohfosho/CordovaCallNumberPlugin

How to use this plugin with onSuccess and onError function my code is this:
$scope.callNumber= function (){
var number = 3333322456;
var onSuccess=function(number){
alert("invia messaggio");
};
function onError(error) {
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}
window.plugins.CallNumber.callNumber(onSuccess, onError, number);
}
but it doesn't work.
I was able to make it work using the code below.
function onSuccess(result){
console.log("Success:"+result);
}
function onError(result) {
console.log("Error:"+result);
}
$scope.callNumber = function(number){
console.log("Launching Calling Service for number "+number);
window.plugins.CallNumber.callNumber(onSuccess, onError, number, false);
}
I attached this to my html element as follows.
<button class="button icon ion-ios-telephone" ng-click="callNumber(0123456789)">Call</button>
Follow this tutorial. It helps me http://rickluna.com/wp/2012/02/making-a-phone-call-from-within-phonegap-in-android-and-ios/
But it's not about this plugin. it's a different way to call immediately via cordova.

Phantomjs does not open web page

I have started testing campus2020 site with casperjs (1.1.0-beta3) + phantomjs (1.9.8). And faced with the problem that site is not opening but instead tests just freeze. I have taken script example from phantomjs site:
var page = require('webpage').create();
page.open('http://informatik.uni-leipzig.de/campus2020', function(status) {
console.log("Status: " + status);
if(status === "success") {
page.render('example.png');
}
phantom.exit();
});
It worked fine on other sites. I have tested opening the campus2020 site with phantomjs on several environments: win 7, Ubuntu 14.04, with ghostdriver and java selenium webdriver, with phantomjs which is run in selenium grid on RHEL 6.6. All this options failed. I have tried to add userAgent option and setTimeout. Nothing changed. Also I tried to open this site using testing framework based on selenium webdriver which used phantomjs but it worked in the same way - phantomjs initialized and then freezes. Any ideas how could be this issue solved?
Update
Now my code looks like these:
var page = require('webpage').create();
console.log("Page is going to be opened...")
page.open('http://informatik.uni-leipzig.de/campus2020/', function(status) {
console.log("Status: " + status);
if(status === "success") {
page.render('example.png');
}
phantom.exit();
});
page.onConsoleMessage = function(msg, lineNum, sourceId) {
console.log('CONSOLE: ' + msg + ' (from line #' + lineNum + ' in "' + sourceId + '")');
};
page.onError = function (msg, trace) {
console.log(msg);
trace.forEach(function(item) {
console.log(' ', item.file, ':', item.line);
})
}
page.onResourceError = function(resourceError) {
console.log('Unable to load resource (#' + resourceError.id + 'URL:' + resourceError.url + ')');
console.log('Error code: ' + resourceError.errorCode + '. Description: ' + resourceError.errorString);
};
page.onResourceTimeout = function(request) {
console.log('Response (#' + request.id + '): ' + JSON.stringify(request));
};
And no errors are shown.
I don't know why there is this issue, but you can update to PhantomJS 2 and it will work. There are not yet binaries for Linux, so you will need to build it yourself.
You will also need to update your CasperJS version, because the 1.1-beta3 doesn't support PhantomJS 2, but the master branch on GitHub does.
phantomjs --debug=true phantom_test.js

Converting an MVC4 Web API Application to Phonegap Android Application

I have an MVC4 Web API application where i have my Api Controller and Code-First EF5 database and some JavaScript functions for the functionality of my app including my Ajax Calls for my Web Api Service.I did the project on MVC because i was having trouble installing Cordova in VS2012, so i have decided to use Eclipse/Android Phonegap platform.Is there a way where i can call my web api service and be able to retrieve my database data designed EF5(MVC4) in my Android Phonegap application without having to start from the beginning the same thing again.I know phonegap is basically Html(JavaScript and Css) but i am having trouble calling my service using the same HTML markup that i used MVC4.I am a beginner please let me know if what i am doing is possible and if not please do show me the light of how i can go about this. T*his is my Html code*
<script type="text/javascript" charset="utf-8" src="phonegap-2.9.0.js"></script>
<script type="text/javascript" charset="utf-8" src="barcodescanner.js"></script>
<script type="text/javascript" language="javascript" src="http://api.afrigis.co.za/loadjsapi/?key=...&version=2.6">
</script>
<script type="text/javascript" language="javascript">
// Wait for device API libraries to load
//
document.addEventListener("deviceready", onDeviceReady, false);
//initialize watchID Variable
var watchID = null;
// device APIs are available
function onDeviceReady() {
// Throw an error if no update is received every 30 seconds
var options = { timeout: 30000 };
watchID = navigator.geolocation.watchPosition(onSuccess, onError, options);
// onSuccess Geolocation
//
function onSuccess(position) {
var element = document.getElementById('geolocation');
element.innerHTML = 'Latitude: ' + position.coords.latitude + '<br />' +
'Longitude: ' + position.coords.longitude + '<br />' +
'<hr />' + element.innerHTML;
}
// onError Callback receives a PositionError object
//
function onError(error) {
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}
}
//declare a global map object
var agmap = null;
// declare zoom control of map
var zoomCtrl = null;
function initAGMap() {
agmap = new AGMap(document.getElementById("MapPanel"));
//TODO: must retrieve coords by device location not hard corded.
agmap.centreAndScale(new AGCoord(-25.7482681540537, 28.225935184269), 5); // zoom level 5 heres
// making zoom controls for map
var ctrlPos = new AGControlPosition(new AGPoint(10, 10), AGAnchor.TOP_LEFT);
zoomCtrl = new AGZoomControl(1);
agmap.addControl(zoomCtrl, ctrlPos);
}
function removeZoomCtrl()
{
zoomCtrl.remove();
}
//function search() {
// var lat = $('#latitude').val();
// var long = $('#longitude').val();
// $.ajax({
// url: "api/Attractions/?longitude=" + long + "&latitude=" + lat,
// type: "GET",
// success: function (data) {
// if (data == null) {
// $('#attractionName').html("No attractions to search");
// }
// else {
// $('#attractionName').html("You should visit " + data.Name);
// displayMap(data.Location.Geography.WellKnownText, data.Name);
// }
// }
// });
//}
//function GetCoordinate() {
//todo: get details from cordova, currently mocking up results
//return { latitude: -25.5, longitude: 28.5 };
}
function ShowCoordinate(coords) {
agmap.centreAndScale(new AGCoord(coords.latitude, coords.longitude), 5); // zoom level 5 here
var coord = new AGCoord(coords.latitude, coords.longitude);
var oMarker = new AGMarker(coord);
agmap.addOverlay(oMarker);
oMarker.show();
//todo: create a list of places found and display with marker on AfriGIS Map.
}
function ScanProduct()
{
//todo retrieve id from cordova as mockup
//This is mockup barcode
//return "1234";
//sample code using cordova barcodescanner plugin
var scanner = cordova.require("cordova/plugin/BarcodeScanner");
scanner.scan(
function (result) {
alert("We got a barcode\n" +
"Result: " + result.text + "\n" +
"Format: " + result.format + "\n" +
"Cancelled: " + result.cancelled);
},
//Callback function if barcodedont exist
function (error) {
alert("Scanning failed: " + error);
});
}
//Function to display Success or error in encoding.
function encode(type, data) {
window.plugins.barcodeScanner.encode(type, data, function(result) {
alert("encode success: " + result);
}, function(error) {
alert("encoding failed: " + error);
});}
function GetProductDetails(barcodeId,coords)
{
//Ajax Call to my web Api service
$.getJSON("api/products/?barcodeId=" + barcodeId + "&latitude=" + coords.latitude + "&longitude=" + coords.longitude)
.done(function (data) {
$('#result').append(data.message)
console.log(data)
var list = $("#result").append('<ul></ul>').find('ul');
$.each(data.results, function (i, item)
{
if (data.results == null) {
$('#result').append(data.message)
}
else {
list.append('<li>ShopName :' + item.retailerName + '</li>');
list.append('<li>Name : ' + item.productName + '</li>');
list.append('<li>Rand :' + item.price + '</li>');
list.append('<li>Distance in Km :' + item.Distance + '</li>');
//Another Solution
//var ul = $("<ul></ul>")
//ul.append("<li> Rand" + data.results.productName + "</li>");
//ul.append("<li> Rand" + data.results.Retailer.Name + "</li>");
//ul.append("<li> Rand" + data.results.price + "</li>");
//ul.append("<li> Rand" + data.results.Distance + "</li>");
//$("#result").append(ul);
}
});
$("#result").append(ul);
});
}
function ShowProductDetails()
{
//todo: display product details
//return productdetails.barcodeId + productdetails.retailerName + ': R' + productdetails.Price + productdetails.Distance;
}
//loading javascript api
$(function () {
initAGMap();
var coord = GetCoordinate();
ShowCoordinate(coord);
var barcodeId = ScanProduct();
var productdetails = GetProductDetails(barcodeId, coord);
ShowProductDetails(productdetails);
});
</script>
It looks like you're on the right track. The obvious error right now is that it's using a relative URL (api/products/?barcodeId=) to call the Web API. Because the HTML is no longer hosted on the same server as the Web API (even though you might be running them both on your local machine still), this won't work anymore. You need to call the service with an absolute URL (for example, http://localhost:8888/api/products/?barcodeId=).
Where is your Web API hosted right now and how are you running the Cordova code? If the Web API is up and running on your local machine and your Cordova app is running on an emulator on the same machine, you should be able to call the service by supplying its full localhost path.
If it still doesn't work, you'll need to somehow debug the code and see what the errors are.

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