Cannot submit a form in phamtomjs - phantomjs

Question

I'm new to PhantomJS. Following this example, I tried to create a script which logs in to avito.ru, then opens up an edit page, changes the price, submits the form, and as the server sends back a confirmation page, script should submit a new form for changes to take place.
So the cycle should be as follows:
Log in
GET .../items/edit/678347092
POST to .../items/edit/678347092
GET .../stiralnaya_mashina_indesit_nws_7105_l_novaya_678347092/edit/confirm
POST to .../stiralnaya_mashina_indesit_nws_7105_l_novaya_678347092/edit/confirm
My code is below:
var steps=[];
var testindex = 0;
var loadInProgress = false;
/*********SETTINGS*********************/
var webPage = require('webpage');
var page = webPage.create();
page.viewportSize = { width: 1366, height: 768 };
page.settings.userAgent = 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36';
page.settings.javascriptEnabled = true;
phantom.cookiesEnabled = true;
phantom.javascriptEnabled = true;
/*********SETTINGS END*****************/
console.log('All settings loaded, start with execution');
page.onConsoleMessage = function(msg) {
console.log(msg);
};
/**********DEFINE STEPS THAT FANTOM SHOULD DO***********************/
steps = [
//Step 1 - Open Avito login page
function(){
console.log('Step 1 - opening Avito');
page.open("https://www.avito.ru/profile/login?next=%2Fprofile", function(status){
});
},
//Step 2 - Populate and submit the login form
function(){
console.log('Step 2');
console.log('URL: ' + page.url);
console.log('Populate and submit the login form');
page.evaluate(function(){
$('input[type="email"]').val('myemail');
$('input[type="password"]').val('mypassword');
$('.js-form-login').submit();
});
},
//Step 3 Profile page
function(){
console.log('Step 3');
console.log('URL: ' + page.url);
page.render('3-avito.png');
console.log("Opening edit page");
page.open("https://www.avito.ru/items/edit/678347092", function(status){
});
},
//Step 4 Edit the price
function(){
console.log('Step 4');
console.log('URL: ' + page.url);
page.render('4-edit-page.png');
console.log("Changing the price and submitting the form");
page.evaluate(function(){
document.querySelector('#item-edit__price').value = '21999';
document.forms[0].submit();
});
},
//Step 5 Confirm changes
function(){
console.log('Step 5');
console.log('URL: ' + page.url);
page.render('5-edit-confirm.png');
console.log("Final confirmation");
page.evaluate(function(){
document.forms[0].submit();
});
},
//Step 6 Render the result
function(){
console.log('Step 6');
console.log('URL: ' + page.url);
console.log("Rendering final page");
page.render('6-result.png');
}
];
/**********END STEPS THAT FANTOM SHOULD DO***********************/
//Execute steps one by one
interval = setInterval(executeRequestsStepByStep,50);
function executeRequestsStepByStep(){
if (loadInProgress == false && typeof steps[testindex] == "function") {
steps[testindex]();
testindex++;
}
if (typeof steps[testindex] != "function") {
console.log("test complete!");
phantom.exit();
}
}
/**
* These listeners are very important in order to phantom work properly. Using these listeners, we control loadInProgress marker which controls, weather a page is fully loaded.
* Without this, we will get content of the page, even a page is not fully loaded.
*/
page.onLoadStarted = function() {
loadInProgress = true;
console.log('Loading started');
};
page.onLoadFinished = function() {
loadInProgress = false;
console.log('Loading finished');
};
page.onConsoleMessage = function(msg) {
console.log(msg);
};
I tried to paste the code inside page.evaluate to the Chrome's console, and it works fine. But as I can see in Fiddler, this script doesn't perform a first POST request (the form is not submitted at step 4). Also I have rendered images indicating that the price is changed at step 4, but since then all other images remain the same.
Below is the output of the script to the console:
All settings loaded, start with execution
Step 1 - opening Avito
Loading started
Loading finished
Step 2
URL: https://www.avito.ru/profile/login?next=/profile
Populate and submit the login form
Loading started
Loading finished
Step 3
URL: https://www.avito.ru/profile
Opening edit page
Loading started
Loading finished
Step 4
URL: https://www.avito.ru/items/edit/678347092
Changing the price and submitting the form
Step 5
URL: https://www.avito.ru/items/edit/678347092
Final confirmation
Step 6
URL: https://www.avito.ru/items/edit/678347092
Rendering final page
test complete!
Any ideas how to make this script work?
Update: the script sometimes fails to submit the first login form, sometimes the second form, and sometimes it submits the second form instead of the third at the step 5, rather than at the step 4.
I've used onResourceRequested to see the headers of the requests, and in the example below it doesn't submit the second form at the step 4, but submits the same form at the step 5. (So I think it is not the problem with the form validation). Here are some extracts:
Step 1 Open login page
Request (#1): {"headers":[{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157
Safari/537.36"},{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"}],"id":1,"method":"GET","time":"2015-11-
19T12:38:51.111Z","url":"https://www.avito.ru/profile/login?next=%2Fprofile"}
Loading started
...
Loading finished
Step 2
- POST login and password
Request (#28): {"headers":[{"name":"Origin","value":"https://www.avito.ru"},{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36"},{"name":"Content-Type","value":"multipart/form-data; boundary=----WebKitFormBoundaryrQFFuoCCfmZnvHH9"},
{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"},{"name":"Referer","value":"https://www.avito.ru/profile/login?next=
%2Fprofile"},{"name":"Content-Length","value":"355"}],"id":28,"method":"POST","time":"2015-11-19T12:38:57.595Z","url":"https://www.avito.ru/profile/login"}
Loading started
Request (#29): {"headers":[{"name":"Origin","value":"https://www.avito.ru"},{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36"},{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"},
{"name":"Referer","value":"https://www.avito.ru/profile/login?next=%2Fprofile"}],"id":29,"method":"GET","time":"2015-11-
19T12:38:58.360Z","url":"https://www.avito.ru/profile"}
...
Loading finished
Step 3 Open new page
Request (#72): {"headers":[{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157
Safari/537.36"},{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"}],"id":72,"method":"GET","time":"2015-11-
19T12:39:13.887Z","url":"https://www.avito.ru/items/edit/678347092"}
Loading started
...Loading finished
Step 4 Edit the price and submit changes
doesn't work
Step 5
- Confirm changes (instead it's performed submit of the form from the step 4)
Request (#107): {"headers":[{"name":"Origin","value":"https://www.avito.ru"},{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36"},{"name":"Content-Type","value":"application/x-www-form-urlencoded"},
{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"},{"name":"Referer","value":"https://www.avito.ru/items/edit/678347092"},
{"name":"Content-Length","value":"8110"}],"id":107,"method":"POST","time":"2015-11-19T12:39:25.950Z","url":"https://www.avito.ru/items/edit/678347092"}
Loading started
Request (#108): {"headers":[{"name":"Origin","value":"https://www.avito.ru"},{"name":"User-Agent","value":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36"},{"name":"Accept","value":"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"},
{"name":"Referer","value":"https://www.avito.ru/items/edit/678347092"}],"id":108,"method":"GET","time":"2015-11-
19T12:39:26.709Z","url":"https://www.avito.ru/ulyanovsk/bytovaya_tehnika/stiralnaya_mashina_indesit_nws_7105_l_novaya_678347092/edit/confirm"}
Loading finished
Loading started
Loading finished
Step 6 - Screenshot