Hello Friends, In the last article we learned to create a
sample chrome extension. Here we are going to create autologout facebook script as an extension.
In case you want to learn how to create a sample extension
please visit this link.
So here we are not going to learn the basics of extension. Lets go throught he
code.
Step 1 - Create a
manifest.json file. It should contain a valid json content –
e.g –
{ "manifest_version": 2, "name": "Logout from FB", "description": "Auto logout from fb after 5 minute.", "version": "1.0", "author": "Saurabh Singh", "browser_action": { "default_title":"You will be logged out in 5 minute.", "default_icon": "icon.png", "default_popup": "popup.html" }, "content_scripts":[ { "matches" : ["https://www.facebook.com/*"], "js" : ["facebook.js"] }], "permissions": [ "activeTab", "idle", "storage", "tabCapture", "tabs", "https://www.facebook.com/*" ] }
Step 2- In content Script we mentioned a js file which will be loaded after adding extension at chrome. Let’s see the code.
var timer = window.setInterval(logoutfromFB, 500000); function Validate(object){ if(typeof object === 'undefined') { return true; } return false; } function logoutfromFB(){ //this opens the main logout menu var openLogoutMenu = document.getElementById("userNavigationLabel"); if(!Validate(openLogoutMenu)) openLogoutMenu.click(); var MutationObserver = window.MutationObserver || window.WebKitMutationObserver; /* I am using mutation observer as using it in chrome only we can listen web and mozzila mutaion observer as well. */ var observer = new MutationObserver(function(mutations){ //_w0d - logout button form class of facebook var logoutFormClass = document.getElementsByClassName("_w0d")[0]; if(!Validate(logoutFormClass)) { alert("Time is up. You will be logged out"); observer.disconnect(); logoutFormClass.submit(); } }); observer.observe(document, { attributes: true, childList: true, subtree: true }); clearTimeout(timer); }
Step 3 – Create an
icon file icon.png and place it at the same folder structure.
Step 4 – Create a
popup.html file which will contain the UI you want to open it.
html>
<html>
<head>
<style>
body {
font-family: "Segoe UI", "Lucida Grande", Tahoma, sans-serif;
font-size: 100%;
}
#status {
/* avoid an excessively wide status text */
white-space: pre;
text-overflow: ellipsis;
overflow: hidden;
}
</style>
</head>
<body>
<h4>Auto Logout from facebook</h4>
</body>
</html>
</html>
We are good with our Auto
log out facebook extension. In case you want to download the code please ClickMe.
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