Styling file upload button for simple_form_for with Bootstrap in Rails 3

Question

Using simple_form_for, Bootstrap and Rails 3. In a form:

<%= f.input :upload, label: 'PDF file:' , input_html: {accept: ('application/pdf') } %>

I don't know how I'd style this so that the "choose file" button can have a different class ('btn btn-primary').

Additionally, when using with Bootstrap at least, its severely misaligned by default. See attached image.

Finally, how do I redefine the text from "No file chosen" to "Chose file" when there isn't one added yet, and show the file name when there is one.

Answer 1

This is how I do it:

1. In the view add your form file field and hide it
2. Add a styled additional field just to display the file name

3. Add a button to trigger the file browse dialog

   <div class="control-group">
     <div class="attach-set">
       <%= f.input :real_file, input_html: { hidden: true }, label: 'Upload Attachment' %>
       <div class="input-append">
         <input id="file-display" class="input-large uneditable-input" type="text">
         <a id="upload-btn" class="btn"><i class="icon-upload-alt"></i> Browse</a>
       </div>
     </div> <!-- /attach-set -->
   </div> <!-- /control-group -->
   

4. In your JS (Coffee w/ jQuery shown), pass the click from the display button onto the real file input and when they select a file drop the file name in the display text field (I drop the path so that I don't see C:\FakePath....)

   $(document).ready ->
   
     # ------------------------------------------------------
     # pretty-fy the upload field
     # ------------------------------------------------------
     $realInputField = $('#real_file')
   
     # drop just the filename in the display field
     $realInputField.change ->
       $('#file-display').val $(@).val().replace(/^.*[\\\/]/, '')
   
     # trigger the real input field click to bring up the file selection dialog
     $('#upload-btn').click ->
       $realInputField.click()
   

Answer 2

This worked great for me and only requires HTML

<label class="btn btn-primary">
  Add a file!
  <span style="display:none;">
    <%= f.file_field :image, required: true, multiple: true, name: 'picture' %>
  </span>
</label>

Answer 3

I ran across and am using Jasny's extension to Bootstrap 3. It seems to work well so far.

Answer 4

No JS required, just plain css

scss

.fileinput-button {
  position: relative;
  overflow: hidden;
  float: left;
  margin-right: 4px;
  width: 110px;
  height: 32px;
  input{
    opacity: 0;
    filter: alpha(opacity=0);
    transform: translate(-300px, 0) scale(4);
    direction: ltr;
    cursor: pointer;
  } 
}

---

html / slim

span class="btn btn-success fileinput-button"
  i.fa.fa-pencil
  span
   |  Select File
  = f.file_field :cover_ar

---

I recommend using compass for cross browser compatibility

Answer 5

As @rafaelfranca said you can't style file input but you can add your own button which will be clicking your hidden original button. See example here http://jsfiddle.net/rUdf2/6/

Answer 6

Every Browser has a different type of file input field button and this makes it a pain. You can play a little with css. This has given me a basic styling with JS without the annoying "No file chosen" text in chrome and Safary:

$(document).ready(function() {
  $(".your_button").css("width", "80px");
});

Otherwise the best solution is to hide it and show a fake one that intercepts the click:

http://duckranger.com/2012/06/pretty-file-input-field-in-bootstrap/

With respect to the question of how to show that a file has been uploaded, a basic solution with jquery file upload is to detect the upload complete event and replace some of your text with a success message (The exact file name I believe it is not possible to obtain with modern browsers):

$(".your_button").fileupload({
    dataType: "json",
    done: function(e, data) {
        $(".place_for_your_text").text("File uploaded.");
    }
});

In summary, a basic solution is to use javascript in your assets to:

1. Hide the annoying "No file chosen text" with css.
2. Place your "Chose file" text next to the button and give it a class you can reference.
3. Replace the text with "File uploaded"