Protractor: Scroll down

You need to wait for the promise to be solved. The following example comes from an open issue

browser.executeScript('window.scrollTo(0,0);').then(function () {
    page.saveButton.click();
})

Update: This is an old question (May of 2014), but still it is getting some visitors. To clarify: window.scrollTo(0, 0) scrolls to the top left corner of the current page.

If you want to scroll to the bottom of your page you could call

window.scrollTo(0, document.body.scrollHeight)

as mentioned by @jsuser in this answer

A more modern approach would be using

browser.actions().mouseMove(element).perform();

Upvotes to @MartinBlaustein in this answer

I found an easier way. If you want to scroll to an element you can use

    browser.actions().mouseMove(element).perform();

After that the browser will be focusing the element.