How to get the parent of an element

Question

For example, I am randomly picking a button element from within the rows of a table.
After the button is found, I want to retrieve the table's row which contains a selected button.

Heres is my code snippet:

browser.findElements(by.css('[ng-click*=submit]')).then(function (results) {
  var randomNum = Math.floor(Math.random() * results.length);
  var row = results[randomNum];
         // ^ Here I want to get the parent of my random button
});

Answer 1

As of the most recent Protractor (1.6.1 as of this writing), the syntax changed a bit:

var row = results[randomNum].element(by.xpath('..')); 

(use element() instead of findElement()).

Answer 2

Decided to use xpath.

var row = results[randomNum].findElement(by.xpath('ancestor::tr'));