Question

27

Ruby on rails: using javascript variable in < %= %> tags in Html.erb

rated 0 times [ 28] [ 1] / answers: 1 / hits: 25197 / 13 Years ago, mon, may 9, 2011, 12:00:00

I am trying to use insert an Javascript variable in the <%= %> tags but it prints the variable name verbose. Here is my code

<script>

     function getGraph(agency,device_id)

      {

            var i = document.createElement('img'); 

            i.src = '<%= show_graph_hcfcd_url('device_id') %>'; 

            $(graphDiv).appendChild(i); 

      }

</script>

Now the Problem is URL gets generated just fine except instead of value of device_id, 'device_id' appears in the rest url.

Any clues how to get over this?

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

melindab

Add To Favorites

Follow

Total Points: 511

Total Questions: 109

Total Answers: 106

Location: San Marino

Member since Thu, Jun 25, 2020

4 Years ago

answered 13 Years ago miles · Accepted Answer

<%= %> will interpret the code on the server

and javascript variable is available to change on the client. So doing

<%= show_graph_hcfcd_url('device_id') %>

is probably not be the correct way of doing this.

You might want to try to put the url(s) in the data attibute of the element:

<div id=device_id data-url=<%= show_graph_hcfcd_url(@device.id) %>>...</div>



<script>

     function getGraph(agency,device_id)

      {

            var i = document.createElement('img'); 

            i.src = $(device_id).data(url); 

            $(graphDiv).appendChild(i); 

      }

</script>

also see

http://railscasts.com/episodes/324-passing-data-to-javascript

There's a good gem to do this called gon