already-seen

This snippet should track all websites and mark them as read It stores the information by localStorage.

Supported Browser

The following Browser are supported. These compatibility informations are based on used the methods and their browser support as mentioned on caniuse.com.

• IE 9-11
• Edge 12-14
• Firefox 3.5-45
• Chrome 4-49
• Safari 4-9
• Opera 12.1-35
• iOS Safari 5.1-9.1
• Android Browser 2.3-44
• Blackberry Browser 7-10
• Opera Mobile 12.1-33
• Chrome for Android 46
• Firefox for Android 42
• IE Mobile 10-11
• UC Brwoser for Android 9.9

If you need higher backwards compatibility, you should replace the localStorage with document.cookie. For IE8 support you need to implement a fallback for "map" and "forEach".

Sources

• http://www.caniuse.com
• http://kangax.github.io/compat-table/es5/

Notes

If you need to access the collected information on server side, you should also replace localStorage with document.cookie.

How to config

Actually you are able to configurate the sites that should be tracked. Further more you can configurate exceptions by the following object:

var config = {
    rules: [
        {
            location: '/path/',
            exceptions: [
                {
                    location: '/path/exception'
                }
            ]
        }
    ],
    prefix: 'prefix-',
    data: 'name'
};

Rules

The config includes rules that discribes the locations that should be tracked.

The following example tracks everything on a webpage and is set by default.

var config = {
    rules: [
        {
            location: ''
        }
    ];

If you only want to track everything within a specific path

var config = {
    rules: [
        {
            location: '/path'
        }
    ];

If you want to track everything within a specific path without one or more subdirectories, you can define exceptions.

var config = {
    rules: [
        {
            location: '/path',
            exceptions: {
                location: '/path/subdirectory'
            }
        }
    ];
    
    rules: [
        {
            location: '/path',
            exceptions: [
                {
                    location: '/path/subdirectory'
                },
                {
                    location: '/path/anotherSubdirectory'
                }
            ]
        }
    ];

How to style

a[data-*] {
    :after {
    content: 'seen'
    }
}

OR

a[data-name] {
    :after {
    content: 'seen'
    }
}

OR

a[data-name="true"] {
    :after {
    content: 'seen'
    }
}