StackOverflow2013

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2013-11-06T18:05:26.410
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2013-11-06T18:11:10.157
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Do you want to when you change your collection and display the picture immediately? You can do this in two way: 1. Add <code>data-image-url</code> to option The best way is image url add into the option use <code>data-image-url</code>: <pre><code><%= f.association :product, include_blank: false, label: 'Product', input_html: {class: 'product_select' do %> <%= f.select :product, @products.map{|a| [a.name, a.id, {"data-image-url" => a.image_url}]} %> <% end %> </code></pre> And use this javascript: <pre><code><script type="text/javascript"> $(".product_select").change(function(){ var selection = $(this).find(':selected').data("imageUrl"); //The product image url $('#prodPicture').html("<img src='" + selection + "' />") }); </script> </code></pre> 2. Use ajax The ajax javascript use post: <pre><code><script type="text/javascript"> $(".product_select").change(function(){ var selection = $(this).val(); $.post("/products/return_image_url", {product_id: selection}, function(data) { if (data != null) { $('#prodPicture').html("<img src='" + data + "' />") } } ) }); </script> </code></pre> And the ruby action about this: <pre><code>def return_image_url product = Product.find(params[:product_id]) ... respond_to do |format| format.json { render :json => product.image_url } end end </code></pre> And I think you do better use <code>Add data-image-url to option</code>. I want to write something about <code>remote: true</code>: <code>remote: true</code> came from <code>jquery_ujs</code>, and it can use in the <code>link_to</code>, <code>button_to</code> or <code>submit</code>. It must have a link. When you change the select or radio and so on, could not use <code>remote: true</code>. You can learn more about <code>remote: true</code> in the guides: <a href="http://guides.rubyonrails.org/working_with_javascript_in_rails.html" rel="nofollow">http://guides.rubyonrails.org/working_with_javascript_in_rails.html</a>
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