Ruby on Rails: Display confirmation message if not includes

Question

In Ruby on Rails, is it possible to display a confirmation message if the user has not entered a string in a text field? I have a form whereby a user enters text in a text field and want to show a confirmation message if they do not enter a certain string. A simple example could be a text field where users can enter items they want to buy from the shop, such as "bread, potatoes, eggs", and so a confirmation message would appear when they click submit saying "You have not entered milk, are you sure you want to proceed?".

I am have the below code working when a user clicks "destroy", and so wonder if this can be developed to work when a user clicks "submit"?

 <%= link_to 'Destroy', email_path(email), method: :delete, data: { confirm: 'Are you sure?' } %>

The data: {confirm: 'Message'} is assigned to the button when the page is loaded. So you could assign a similar message to a Submit button, but it would always appear. It would not work for a conditional that changes based on user input. The slick way to do it would be on the front end with custom Javascript. To do it with Ruby/Rails, you'll need to test the result on the back end and generate a flash message at the controller level. — moveson
– moveson, Commented Jan 24, 2017 at 20:04
@moveson I am aware that I could do that and that it would always appear, but is it possible to do one based on what the user inputs? — Ben Smith
– Ben Smith, Commented Jan 24, 2017 at 20:06
@BenSmith does this answer your question? stackoverflow.com/a/41838032/1536309 if you post your rails form code i can update the example — Blair Anderson
– Blair Anderson, Commented Jan 24, 2017 at 22:09

Blair Anderson · Accepted Answer · 2017-01-24 20:07:44Z

1

You can do this without rails using HTML validation

https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Data_form_validation

<input pattern=".{3,}" required title="Minimum 3 characters required">
<input pattern=".{8, 15}" required title="Input string should be between 8 - 15 characters">

your rails form helpers pass through options to html inputs.

answered Jan 24, 2017 at 20:07

Blair Anderson

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