From: "ara.t.howard" <ara.t.howard@...>
Date: 2007-12-21T13:42:41+09:00
Subject: Re: Random Positioning of Radio Form Items?


On Dec 20, 2007, at 8:03 PM, ga rg wrote:

> I made a short multiple choice quiz in ruby using erb in an rhtml  
> page.
>
> I have an array of arrays:
>
> @allanswers = [["thailand", "jamaica", "nairobi", "indonesia"],
>     ["lincoln", "kennedy", "roosevelt", "reagan"],
>     ["brazil", "canada", "columbia", "peru"],
>     ["nelson", "bart", "kennedy", "jack"]]
>
> and then I want to have the multiple choice options in a random order.
> Meaning that every time a person refreshes the page, the order of the
> choices changes.
>
> <% 4.times do |num|%>
> <INPUT type="radio" name="answer" value="<%=first =
> @allanswers[@questionNum][rand(num)]%>"> <%=first%> <BR>
> <%end%>
>
> where @allanswers is the array of arrays.
> @questionNum is an iterator in the code elsewhere
>
> The obvious problem with this method is that the rand(num) ends up
> giving duplicate options. What elegant solution can you think for this
> problem? Basically, I just want to get random but unique numbers.
>
> Thank you for reading.

<% @allanswers[@questionNum].sort_by{ rand }.each do

...
...

a @ http://codeforpeople.com/
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