Accessing Ruby variable inside a Javascript

Question

I am new to Javascript. I am writing a view in haml that fills a dropdown box by using JQuery and to fill that box JQuery requires the value of a Ruby variable s_id like following:

$(document).ready(function(){
  var param = s_id  //here s_id is a ruby variable
  ...

Here s_id is a ruby variable that is defined in the Haml view file for which the JS get called. Can anyone give any idea how to achieve the above thing.

stackoverflow.com/questions/13673227/… <---this might be helpful — Jai
– Jai, Commented Sep 13, 2013 at 7:59

KappaNossi · Accepted Answer · 2013-09-13 07:56:57Z

2

I don't think there's a way to directly access the variable. If the JS code is on the same page, you can just add the value using <%= s_id %>. I haven't used HAML much, so you would have to adapt it from this ERB code.

Another solution, since your doing it after document.ready is to store the value in a hidden field and then select it from JS $('#your_sid_field').val()

answered Sep 13, 2013 at 7:56

KappaNossi

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Tim Dorr · Accepted Answer · 2013-09-13 08:00:16Z

0

You'll need to move it to be a partial. Set it up in a file called something like app/views/whatever/_some_script.js.erb and then reference it like so:

render partial: 'whatever/some_script', locals: { s_id: s_id }

In the javascript file, you'll do this:

$(document).ready(function(){
  var param = <%= s_id %>;
  ...

Make sure if it's a string, you put quotes around it. That should be it.

answered Sep 13, 2013 at 8:00

Tim Dorr

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2 Comments

Joy Over a year ago

In my situation, I cannot use partial.

Tim Dorr Over a year ago

Why can't you use partials? They are a core Rails feature. As an alternative, you can just include a bit of Javascript in your view template to make that variable accessible by the Javascript on the page.

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