Last Login and Logout (Object Based)

Want to know the last time a user logged in to your Knack app?

This feature is usually implemented to keep track of the users who use the application, especially the period of time in which a session lasts.

Knack applications allow you to implement authentication forms simply and quickly, however when establishing a control or audit on the logins or log outs that are constantly running within the application, you must resort to the help of JavaScript for that end. Below we list a series of steps that will serve as a guide for the implementation of these logs:

1. Create a new object in the database: Although the object can have any number of fields, it is recommended that it have at least three fields: Email, Date / Time and Action (Multiple Choice = Login or Logout).

2. Add the following lines of code within the API & Code section:

var LOGIN_PAGE = false;
var LOGIN = false;

// Set Knack Info for your app
var KNACK_HEADERS = {
    'X-Knack-Application-ID': 'XXXXXXXXXXXXXXXXXXXX',
    'X-Knack-REST-API-Key': 'YYYYYYYYYYYYYYYYYYYYY'
};

// Change object_XX for Login Log object ID
var objectId = 'object_XX';
// Login actions
$(document).on('knack-scene-render.any', function (event, scene) {
    LOGIN_PAGE = ($('.kn-login').length == 1) ? true : false;
    if (LOGIN_PAGE) {
        LOGIN = false;
        $('input[type="submit"]').click(function (e) {

            e.preventDefault();

            LOGIN = true;

            $('form').submit();
        });
    } else {
        if (LOGIN) {
            LOGIN = false;
            var user = Knack.session.user;
            // Create record log
            $.ajax({
                type: 'POST',
                headers: KNACK_HEADERS,
                url: Knack.api_url + '/v1/objects/' + objectId + '/records',
                data: {
                    field_XXX: user.email,  // Change field_XXX for Email field ID
                    field_YYY: 'Login'      // Change field_YYY for Action field ID 
                }
            });
        }
    }
});
// Logout actions
$(document).on('knack-scene-render.any', function (event, scene) {
    // Check is already authenticated
    if (!Knack.session.user) {
        return;
    }
    $('.kn-log-out').on('click', function () {
        var user = Knack.session.user;

        // Create record log
        $.ajax({
            type: 'POST',
            headers: KNACK_HEADERS,
            url:  Knack.api_url + '/v1/objects/' + objectId + '/records',
            data: {
                field_XXX: user.email,  // Change field_XXX for Email field ID
                field_YYY: 'Logout'     // Change field_YYY for Action field ID 
            }
        });
    });
});

And on this object you can use different native Knack components such as tables, reports or graphs.

We’re sure this will come in handy on all your projects.

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