如何在Javascript中访问Rails环境变量

Question

I'm using dotenv and have API keys in my .env file. I would like to be able to use that api key in a javascript file, but am not sure how it would have access to Rails' environment variables. I'm not sure if this is correct, but I changed the end of the .js file to .js.erb and used my key as such (but it's not working):

var response = "http://bustime.mta.info/api/where/stops-for-location.json?lat=40.708727599999996&lon=-74.002798&latSpan=0.005&lonSpan=0.005&key=" + "<%= ENV['MTA_API_KEY'] %>";

Any and all help is greatly appreciated.

UPDATE: When I ask for what the variable response is, I just get back, " http://bustime.mta.info/api/where/stops-for-location.json?lat=40.708727599999996&lon=-74.002798&latSpan=0.005&lonSpan=0.005&key= " (it's not rendering anything for where the key should go).

Answer 1

I was able to figure it out. I didn't need to concatenate between the request and my key variable:

var response = "http://bustime.mta.info/api/where/stops-for-location.json?lat=40.708727599999996&lon=-74.002798&latSpan=0.005&lonSpan=0.005&key=<%= ENV['MTA_API_KEY'] %>";

By keeping the key variable in with the string it worked. Thanks for all the help.