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Zach Robinson8,862 Points
Why are we using the getElementsByTagName method for the button functionality? Why not use an ID?
I understand the concept of using document.getElementsByTagName("button"); I just don't understand why it's being used. Wouldn't it be more prudent to assign that button a particular ID, and then use the getElementById method instead? I just can't see how having an array of all the buttons on the page would be useful; other than when you're referencing the first button, wouldn't you have to manually rifle through your code and keep a numerical count of the button you want (like if I wanted to reference a button halfway through my code, wouldn't I have to manually find its index value by counting each button I see)?
If the reason we're doing this is simply because Andrew is trying to expose us to a new method that we may not have seen before, then please disregard this question - but if this method is preferred when scripting, can someone explain to me why?
Using an ID is also faster, though unless you're going to use it a lot, is unlikely to make a big difference.
I don't think he covers it in this course, but there are also newer methods available that are closer to the CSS/jQuery syntax for selecting elements on the page:
Hi In one of the courses the instructor had said that it is best not to change the html file unless the element is being used very frequently.