ruby on rails - How to show image file when i select it in file browser , Carrierwave gem -

i using carrierwave gem image uploading. want achieve image upload , show after uploading completed.

i read wiki of gem , used same code not working.

= form_for @user, html: { :multipart => true, class: 'battle_form' } |f|   = image_tag(@user.file_attachment1_url) if @user.file_attachment1?   = f.file_field :file_attachment1, class:'fileinput', name:'image1'  = f.hidden_field :file_attachment1_cache 

carrierwave gem github

if want show image after upload, use img tag , upload file url like:

= image_tag(@image_url) 

this work after upload completed , refresh current page.

if want preview image before form submit, may find way javascript solve it, dropzonejs may you