Cordova - refuse to execute inline event handler because it violates the following content Security policy
I'm training for Cordova application development and I turn around a problem with Content Security Policy.
My application is running with the Android emulator, but when I have to execute a javascript I get a message in NetBeans (output window).
Refused to execute inline event handler because it violates the following Content Security Policy directive: "script-src 'self' https://ssl.gstatic.com". (22:35:56:126 | error, security)
at www/index.html:58
My code is below. This is my index.html. I try to understand how CSP works and I think I understand the concept, but in this case, I don't understand the problem. Line 58 is the comment.
<html>
<head>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' * data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self'; script-src 'self' https://ssl.gstatic.com; media-src *">
<meta name="format-detection" content="telephone=no">
<meta name="msapplication-tap-highlight" content="no">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
<title>Hello World</title>
<link rel="stylesheet" type="text/css" href="css/index.css">
</head>
<body>
<div class="app">
<h1>Apache Cordova</h1>
<div id="deviceready" class="blink">
<p class="event listening">Connecting to Device</p>
<p class="event received">Device is Ready</p>
</div>
</div>
<!--
line 58
-->
<button onclick="capturePhoto();">Capture Photo</button> <br>
<img style="display:none;width:80px;height:80px;" id="smallImage" src="" />
<img style="display:none;" id="largeImage" src="" />
<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript" src="js/index.js"></script>
</body>
</html>
By advance thanks for your help because I need it. Jérôme
Answer
Check this link, it says:
Inline JavaScript will not be executed. This restriction bans both inline
<script>blocks and inline event handlers(e.g. button onclick="...").
To avoid cross-site scripting issues like below specified
one.app#/home:1 Refused to execute inline event handler because it violates the following Content
Security Policy directive: "script-src 'self' 'nonce-d452460d-e219-a6e5-5709-c8af6ca82889'
chrome-extension: 'unsafe-inline' 'unsafe-eval' https://sfdc.azureedge.net
*.na34.visual.force.com https://ssl.gstatic.com/accessibility/". Note that 'unsafe-inline'
is ignored if either a hash or nonce value is present in the source list.
Go for event listener functions instead of onclick='myFun()".
<body onload="main();">
<button onclick="clickHandler(this)">
Click for awesomeness!
</button>
</body>
<script>
function clickHandler(element) {
// On click Code
}
function main() {
// Initialization work goes here.
}
</script>
In order to to work with new Browser you need to write your code with a clean separation between content and behavior.
<body>
<button>Click for awesomeness!</button>
</body>
<script src="popup.js"></script>
<!-- popup.js -->
document.addEventListener('DOMContentLoaded', function () {
document.querySelector('button').addEventListener('click', clickHandler);
main();
});
function clickHandler(element) {
// On click Code
}
function main() {
// Initialization work goes here.
}
<!-- popup.js -->