Showing Or Hiding HTML Form Elements With JavaScript
Recently asked on Yahoo! Answers:
AJAX - show an extra text field if one radio button is pressed?
I’m looking for a short AJAX script that would add an extra textfield into a form if in the radiogroup a certain button is pressed.
Example
( ) yes ( ) no < if 'no' choosen
Before I get into answering this question, I’m going to launch into a tirade against the worst kind of Yahoo! Answers jackasses: The self-styled know-it-alls who curse darkness, rather than lighting candles.
Certain people on Yahoo! Answers can be counted upon to provide terse, arrogant, useless replies to serious questions. Most often, it’s something along the lines of, “You mean {confusing term} and it is {harangue that doesn’t answer question}. You can do this: {obscure, curt instructions}.”
Being brief when a question is succinct and appropriate is a virtue, so long as it’s obvious the person will understand your answer. It’s also perfectly fine, in my opinion, to ridicule totally moronic questions (such as, “How do I make a chat program?”, “How do I become a hacker?”, “How do I visit MySpace from school? They block it” or “How do I crack the serial number for this program?”).
But when someone (such as this questioner) makes a perfectly reasonable request, clearly demonstrates he has limited knowledge of the subject, makes it clear what he is after and what language he wants used, and even goes so far as to specifically ask for code, you’re not helping if you only say, “That isn’t AJAX, it’s JavaScript,” even if you add in some information that person clearly won’t understand.
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