Form validation using Ajax in Rails Application

You want that after they stop typing (or if they push a button) an ajax request is sent to your users controller for a method like check_username.

That method searches all users and returns either yes (its taken) or no (not available) and then the ajax can complete and tell your user if they are good to go or not

So you need the following

• ajax request in javascript
• method in your controller
• route for that method

I suggest start building something and then asking questions when you get stuck. Happy coding!

So the goal is to have it after they stop typing an ajax request is sent out to check if it is taken or not. I have the form written, basically it looks like this:

<%= bootstrap_form_for(@user) do |f| %>
<%= f.alert_message "Please fix the errors below.", error_summary: false %>

<%= f.text_field :full_name %>
<%= f.text_field :email %>
<%= f.password_field :password %>
<%= f.text_field :username %>

<%= check_box_tag :remember_me %>
<%= label_tag :remember_me, "Keep you signed in?" %>

<%= f.check_box :terms_of_service, label: "I agree to the Terms of Service" %>

<%= f.submit "Join!" %>

<% end %>

Now that I have the form completed and working correctly, I just don't know the next step to take. I understand that I have to write some javascript but I don't know how to make it work with ruby. Also, I am not sure what I have to write for a method in my controller. I am assuming it is within my user controller. Maybe there is a gem to make this process easier? I know that I will want to use ajax in other parts of the web app so using some type of gem may be the right way to go. I am just so confused on this stage of the project! I have tried to Google different tutorials but I have not found anything really useful to me related to this topic. Thanks so much for the guidance!