Loading stuff step by step (and not loading everything at once) via ajax is great for decreasing initial load times and speed up the performance of your app. So kudos for giving it a go. Here's what you can do:

Let's say that the information inside _details.html.erb is wrapped around in a div called .deails-wrapper, so that it becomes

_details.html.erb (or whatever the page is called)

<div class="details-wrapper">
   <p> Some details about this Opportunity </p>
</div>

Remove:

<div class="details-wrapper">

<div> <!-- or whatever element is the greatest parent -->

And keep just the actual information inside _details.html.erb

<p> Some details about this Opportunity </p>

Then what you do, is put the outer-most element below your button:

<%= link_to "DETAILS", opportunity_details_path(:reporting_date => date), class: "btn small-bright-button hidden-xs" %>

Where you want the information to appear, so that it becomes

<%= link_to "DETAILS", opportunity_details_path(:reporting_date => date), class: "btn small-bright-button hidden-xs" %>

<div class="details-wrapper"><div> <!-- Just an empty div for now -->

(Don't forget to add remote: true to the button)

inside the controller add render :opportunity_details:

def opportunity_details
render :opportunity_details
end

Now create a file with the same name as the controller action, in the same folder as the _details.html.erb (or whatever it's called) but not a html.erb but a js.erb file. All the js-code inside this .js.erb will then be executed everytime someone clicks the button. file Do you remember the empty element we put under the button – It will work as our render-point.

opportunity_details.js.erb

$('.details-wrapper').html("<%= escape_javascript(render :partial =>'path_to/details.html.erb') %>");

And this is basically it. You may encounter some errors due to your model not being setup to accept js requests. But all in all you're good to go!

Rails：使用ajax渲染列表

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