Button to add an input box and accessing collections of inputs in controllers?

Question

I'm a form noob and want to know how to create a collection of text-input boxes, along with a button that will allow users to add another input to this collection.

Can this be done purely with ruby and rails? If so, how do I access the individual inputs from the group when doing stuff in the controller? How do I identify each? How can I tell the size of the collection/how many inputs there are?

Any help would be appreciated, thanks!

Answer 1

A trivial, unstyled example of the front-end portion:

HTML:

<input type="button" id="addBtn" value="Add"/>
<div id='inputs'>
</div>

Javascript with jQuery:

var nextId = 0;

$("#addBtn").on("click",function(){
    $("#inputs").append("<input type='text' id='text_"+nextId+"'/>");
    nextId++;
});

The inputs have unique, sequential ids. At any given time, the count is available either from nextId or $(".dynInput").length

http://jsfiddle.net/5mHTh/1/