Javascript code to scroll in steps using selenium webdriver

Question

How should I scroll in steps instead directly getting to one position using driver.executeScript("scroll(0,1000)"); Tried the code below but it didn't worked..

for(var i=10;1<2000;i=+50){
    driver.executeScript("scroll(0,i)");
}

It say i is not defined. let me know where am I going wrong

Answer 1

driver.executeScript("scroll(0," + i + ")");