Protractor : How to wait for page complete after click a button?

You don't need to wait. Protractor automatically waits for angular to be ready and then it executes the next step in the control flow.

Depending on what you want to do, you can try:

browser.waitForAngular();

or

btnLoginEl.click().then(function() {
  // do some stuff 
}); 

to solve the promise. It would be better if you can do that in the beforeEach.

NB: I noticed that the expect() waits for the promise inside (i.e. getCurrentUrl) to be solved before comparing.

I just had a look at the source - Protractor is waiting for Angular only in a few cases (like when element.all is invoked, or setting / getting location).

So Protractor won't wait for Angular to stabilise after every command.

Also, it looks like sometimes in my tests I had a race between Angular digest cycle and click event, so sometimes I have to do:

elm.click();
browser.driver.sleep(1000);
browser.waitForAngular();

using sleep to wait for execution to enter AngularJS context (triggered by click event).

With Protractor, you can use the following approach

var EC = protractor.ExpectedConditions;
// Wait for new page url to contain newPageName
browser.wait(EC.urlContains('newPageName'), 10000);

So your code will look something like,

emailEl.sendKeys('jack');
passwordEl.sendKeys('123pwd');

btnLoginEl.click();

var EC = protractor.ExpectedConditions;
// Wait for new page url to contain efg
ptor.wait(EC.urlContains('efg'), 10000);

expect(ptor.getCurrentUrl()).toEqual(url + 'abc#/efg');

Note: This may not mean that new page has finished loading and DOM is ready. The subsequent 'expect()' statement will ensure Protractor waits for DOM to be available for test.

Reference: Protractor ExpectedConditions