'TypeError: undefined is not a function' using Protractor

Question

I am aware there are many topics on this error code. However, I am struggling to find any solutions that help (or maybe I'm just stupid).

I am building a Protractor test for a web page, and my original JavaScript worked perfectly. But I wanted to convert it all into using page objects, to make it easier to edit and understand as well as avoid code repetition.

The first page object I use for logging in works perfectly fine, however my second page object for adding new users does not.

The main test document from which I am linking the page objects to and from contains both instances of the code that do and don't work, respectively.

• The first instance that works is line 12.

• The second instance that doesn't is on line 23.

  This is shown below:

    var util = require('util')
  
    describe ('This is to test the functionality of the Admin page.', function()
    {
  
        beforeEach(function(){
            browser.ignoreSynchronization = true;
            browser.get('https://website');
        });
  
        it ('Should log in and move to the Users page.', function() {
            var login_page = require('../page/login_page.js');
            var loginPage = new login_page;
            loginPage.login('user', 'pass');
  
            beforeEach(function () {
                expect(browser.getCurrentUrl()).toEqual('https://website');
            });
  
            describe('This should hold all the tests while logged in to Admin site', function () {
  
                it('Should create first new User.', function() {
                    var users_page = require('../page/users_page.js');
                    var usersPage = new login_page;
                    usersPage.addUserButton().click();
                    usersPage.addUser('Test', 'Smith', '[email protected]', 'Password', 'Password', '0')
                    usersPage.userRole[0];
                    usersPage.confirm().click();
                    usersPage.back().click();
                });
  
                 it('Should logout', function () {
                    element(by.cssContainingText('span', 'Logout')).element(by.linkText('Logout')).click();
                });
            });
        });
    });
  

The error I get when running the Protractor test in cmd is:

1) This should hold all the tests while logged in to Admin site Should create first new User.

       Message:
         TypeError: undefined is not a function
       Stacktrace:
         TypeError: undefined is not a function
        at [object Object].<anonymous> (C:\\\\\\test
    04_spec.js:25:27)

The page that the first instance references is:

require ('../page/users_page.js');

var login_page = function(){

    this.username = element(by.id('username'));
    this.password = element(by.id('password'));

    this.get = function(urlVal){
        browser.get(urlVal);
    };

    this.login = function(un, pass){
        this.username.sendKeys(un);
        this.password.sendKeys(pass);
        element(by.tagName('button')).click();
    };
};

module.exports = login_page;

And the page that the second instance references is:

require ('../page/users_page.js');

var users_page = function(){

    this.addUserButton = element(by.css('[role="button"]'));
    this.firstName = element(by.model('firstname'));
    this.lastName = element(by.model('lastname'));
    this.userName = element(by.model('username'));
    this.password = element(by.model('password'));
    this.confirmPassword = element(by.model('confirmpassword'));
    this.confirm = element(by.css('[class="btn btn-success marginRight10px floatLeft"]'));
    this.back = element(by.css('[class="btn floatLeft"]'));

    this.addUser = function(fn, ln, un, pw, cpw){
        this.firstname.sendKeys(fn);
        this.lastword.sendKeys(ln);
        this.username.sendKeys(un);
        this.password.sendKeys(pw);
        this.confirmpassword.sendKeys(cpw);
    };

    this.userRole = function(index){
        element(by.model('tes.userRole')).$('[value="'+index+'"]').click();
    };

    return require('./users_page.js');

};
module.exports = new users_page();

Answer 1

There is at least one problem: addUserButton is not a function. Replace:

usersPage.addUserButton().click();

with:

usersPage.addUserButton.click();

And the same for confirm and back page object fields.

---

Also, instead of:

usersPage.userRole[0];

you probably meant to call the underlying page object function:

usersPage.userRole(0);

---

Aside from that, you probably meant to instantiate a new "users page" object. Replace:

var usersPage = new login_page;

with:

var usersPage = new users_page;