CODEWITHSUNDEEP
javascriptruby-on-railsruby
user1468464
user1468464

Reputation: 11

How to make Ruby code fetched from DB work in JS?

I am using rails code to populate some html and JS code into mysql DB. The code is then fetched from DB and rendered on a configurable page. In the HAML file, When I use ruby code in a JS alert it works fine:

alert("#{user.id}")

the id is displayed because I pass the user object to this page. Now when I save this line alert("#{user.id}") in DB and render the JS code, it alerts #{user.id} as a string. How do I make it realize that the string coming from DB is not just a string, it is some ruby code which needs to be interpreted on the page as I am getting the user object there. So it should display the actual id like 5 or 6 instead of showing a simple string "#{user.id}"

Plz help

Upvotes: 1

Views: 123

Answers (3)

vikhyat
vikhyat

Reputation: 1554

If it is okay to change the syntax (something like alert("<%= user.id %>")), you can use ERB or some other similar templating engine.

Here's how to do it with ERB.

require 'erb'
user_id = 23
str = 'alert("<%= user_id %>")' # get these from the database
ERB.new(str).result(binding)

Note that this is dangerous because it means that users can actually run code from within the ERB.

To get around this I suggest using another templating language.

Here are some options:

Upvotes: 1

Wawa Loo
Wawa Loo

Reputation: 2276

Personally, I store the data in a hidden field in my view, then work with it with jQuery.

=form_for :user do |f|
  =f.hidden_field :id

Then in javascript

$('document').ready ->
  alert $('#user_id').val()

Upvotes: 0

Someth Victory
Someth Victory

Reputation: 4549

There are a few way to do in order to pass data from Rails to JS, see the video here:

http://railscasts.com/episodes/324-passing-data-to-javascript?view=comments

Upvotes: 0

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