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    <p>The solution to this problem is quite complex, but I have found a way to do it. It is surprising to me that the solution is not readily available, since it does seem, as r-dub says, something that is quite common. I ended up not using any of the edit-in-place facilities of a jQuery plugin, and instead modified a text field directly with the help of jQuery on the basis of a form text field. I other words, I followed (B) above.</p> <p>I have a view that looks like this:</p> <pre><code>Available: &lt;span id="available_cr"&gt;&lt;%= @available_credits %&gt;&lt;/span&gt; Remaining: &lt;span id="remaining_cr"&gt;&lt;%= @remaining_credits %&gt;&lt;/span&gt; &lt;%= form_for(@page, :html =&gt; { :id =&gt; 'do_fvalue' }, :remote =&gt; true) do |f| %&gt; &lt;div class="field"&gt; How many to buy at &lt;%= @cost %&gt; credits per unit? &lt;%= f.text_field :fvalue, :autocomplete =&gt; :off %&gt; &lt;/div&gt; &lt;div class="field"&gt; How many to buy at &lt;%= @cost_20 %&gt; credits per unit? &lt;%= f.text_field :gvalue, :autocomplete =&gt; :off %&gt; &lt;/div&gt; &lt;div class="actions"&gt; &lt;%= f.submit "Update" %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p>I then stuff the rails @-variables into a .html.erb partial (rendered at the beginning of my page .html.erb) so that javascript/jQuery can access them:</p> <pre><code>&lt;script type="text/javascript"&gt; var cost = parseInt(&lt;%= @cost %&gt;) var cost_20 = parseInt(&lt;%= @cost_20 %&gt;) var available_credits = parseInt(&lt;%= @available_credits %&gt;) var remaining_credits = parseInt(&lt;%= @remaining_credits %&gt;) &lt;/script&gt; </code></pre> <p>Then, in public/javascripts/applications.js, I have the following code:</p> <pre><code>function checkFields(){ var to_buy_f = $("#page_fvalue").val(); var to_buy_g = $("#page_gvalue").val(); var subtract_f = to_buy_f * cost; var subtract_g = to_buy_g * cost_20; var remain = available_credits - subtract_f - subtract_g; $("#remaining_cr").text(remain); }; $("#page_fvalue").keyup(function () { checkFields(); }).keyup(); $("#page_gvalue").keyup(function () { checkFields(); }).keyup(); </code></pre> <p>The checkFields function updates #remaining_cr based on the values found in #page_fvalue and #page_gvalue. Notice that it makes use of available_credits, cost, and cost_20, which we stuffed into the javascript variables above. The last two functions tell jQuery to monitor #page_fvalue and #page_gvalue for keyup events. When the user presses a key, it calls checkFields() to update #remaining_cr.</p> <p>All of this aside, when the user clicks "submit" on the form, the whole form gets submitted with the current values. I don't know whether this is the most efficient way to do what I was trying to do, but it works!</p>
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