Nuru Salihu Nuru Salihu - 6 months ago 147
Javascript Question

How to run 'window' js command in nightwatch js

Please i have some tests that varies depending on my device. I have to determine whether my device is mobile or desktop before beginning of a test.

I wanted to exploit the nightwatch before function and i added below in my globals.js

var self = module.exports = {
environment: undefined,
beforeEach: function (done) {
self.environment = browser.window.navigator.userAgent;
console.log("Run against: " + self.environment);
done();
},

};


and i my test

module.exports = {
tags: ['assetindex'],
'visit': function(browser) {
(/Mobile/.test(browser.globals.environment)) ?
browser
.page.assetindex().mobileVisit()
.end()
:
browser
.page.assetindex().mobileVisit()
.end()
}
};


However, my code failed at

self.environment = browser.window.navigator.userAgent;


saying widnow not defined. The error makes sense considering i am not running against a browser object . Please how do i achieve that? How can i the js window against my browser in nightwatch ? Any help or alternative is highly appreciated

update

After reading the answer below, i update my global.js to

var self = module.exports = {
environment: undefined,

beforeEach: function (browser, done) {
browser.execute(function(data) {
return window.navigator.userAgent;
}, [], function(result) {
console.log('it comes here ', result);
self.environment = result.value;
});

console.log("Run against: " + self.environment);
done();
},

};


TO my surprise, self.environment is always undefined. It does not seem to be running the .exec function.

Answer

You can probably use the execute command:

browser.execute(function(data) {
    return window.navigator.userAgent;
}, [], function(result) {
    self.environment = result.value;
});

For more information: http://nightwatchjs.org/api/execute.html

In your case, when using beforeEach you need to move the done() inside the callback function, like so:

beforeEach: function (browser, done) {
    browser.execute(function(data) {
        return window.navigator.userAgent;
    }, [], function(result) {
        console.log('it comes here ', result);
        self.environment = result.value;
        console.log("Run against: " + self.environment);
        done();
    });
},