cordova - How to find out what is causing my white screen of death? -


i have ionic app. it's works couple of weeks, stops. splash screen followed white screen of death. when debug using chrome://inspect app following message in console:

no content-security-policy meta tag found. please add 1 when using cordova-plugin-whitelist plugin.

if clear data on app, starts working, , same message when debug working app on device, don't think it's plugin @ fault. however, have used plugin explore white-screen problem, because can white screen of death if add following index.html (a content security policy prevents loading resources source):

<meta http-equiv="content-security-policy" content="default-src 'none'">

when that, error messages in console:

refused load stylesheet 'file:///android_asset/www/lib/ionic/css/ionic.min.css' because violates following content security policy directive: "default-src 'none'". note 'style-src' not explicitly set, 'default-src' used fallback

and when change tag this:

<meta http-equiv="content-security-policy" content="default-src 'self'">

i in console:

refused apply inline style because violates the..etc

and

evalerror: refused evaluate string javascript because 'unsafe-eval' not allowed source of script...etc"

but now, instead of white screen, exception handler catching problem , reporting it.

from this, deduce absence of files causes white screen, because exception handler works if files loaded.

i can rid of errors in console using security policy:

<meta http-equiv="content-security-policy"            content="style-src 'self' ionic.bundle.min.js 'unsafe-inline';                    script-src 'self' console-via-logger.js 'unsafe-eval';                    img-src 'self' ionic.bundle.min.js data:">

so wondering if there way catch exception in application @ earlier stage can diagnose original white-screen problem? think must in data preventing file being loaded, how be?

to test kerri shotts theory javascript error getting in way of app startup, added throw app.js file:

(function () {     'use strict';      throw ('test');      //setting dependencies     var app = angular.module('app', [..etc..]     ]);  })();

sure enough - white screen of death

next added window.onerror script index.html:

<body data-ng-app="app">     <script>         (function () {             window.onerror = function (errormsg, url, linenumber, column, errorobj) {                 alert('error: ' + errormsg + ' script: ' + url + ' line: ' + linenumber                 + ' column: ' + column + ' stacktrace: ' + errorobj);             }         }());     </script>     ....etc

i had add 'unsafe-inline' content security policy script run, once did got alert error message instead of white screen.

my csp:

<meta http-equiv="content-security-policy"           content="style-src 'self' ionic.bundle.min.js 'unsafe-inline';                    script-src 'self' console-via-logger.js 'unsafe-eval' 'unsafe-inline';                    img-src 'self' ionic.bundle.min.js data:">

Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more