Some commands are not chainable with pageObjects.

some functions like ‘getHTML’, ‘selectByIndex’ are not working with PageObject. [v4 with wdio]

File: pageobjects/registration.page.js

...
var registrationPage = Object.create(page, {
    textBox_email: { get: function() { return browser.element('#email'); } },
    dropDown_sex : { get: function() { return browser.element('select[name=sex]'); } }

...

file: tests/example.js

var RegistrationPage = require ('../pageobjects/client/registration.page');
...
RegistrationPage.textBox_email.setValue(suiteData.email); // works 
browser.selectByIndex('select[name=sex]',1);    // works

RegistrationPage.dropDown_sex.selectByIndex(1); // error: number or type of arguments don't agree with selectByIndex commandcode

RegistrationPage.dropDown_sex.selectByIndex errors out with message

“number or type of arguments don’t agree with selectByIndex commandcode”

[christian-bromann]

number or type of arguments don’t agree with selectByIndex command

I have to fix that for couple of commands which do parameter checks

when the element doesn’t exist

In your page object I would recommend to always use the elements commands to query elements. This way you don’t get these errors and getText returns [] which is assertable

[patthiel]

this might be a little hacky, but you could do this for your page object…

textBox_email: { get:  
    try { 
        return browser.element('#email'); 
    }
    catch(err) { 
        return false;
    } 
},

This will try the command, and if it finds the element return true, if it doesn’t find the element and returns any error, it’ll return false.