How to loop over an array in CoffeeScript?

Question

I want to loop over the array lists_indexes to update several lists of values in my HTML page.

Currently, I update a single such list through:

$('#List_1').html("<%= escape_javascript(options_for_select(@values, disabled: @disabled)) %>")

How do I loop over lists_indexes to update List_2, ..., List_n?

An array, containing the lists indexes.

cedric
– cedric

2015-09-29 16:30:03 +00:00
Commented Sep 29, 2015 at 16:30 — cedric
– cedric, Commented Sep 29, 2015 at 16:30
list_indexes = [1, 2, 3, 4..., n]

cedric
– cedric

2015-09-29 16:31:21 +00:00
Commented Sep 29, 2015 at 16:31 — cedric
– cedric, Commented Sep 29, 2015 at 16:31

Zahid · Accepted Answer · 2015-09-29 16:52:28Z

5

What you need is this, you dont need to loop over in CoffeScript, you can loop via ruby

<% list_indexes.each do |i| %>
$("#List_<%= i %>").html("<%= escape_javascript(options_for_select(@values, disabled: @disabled)) %>")
<% end %>

answered Sep 29, 2015 at 16:52

Zahid

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3 Comments

cedric Over a year ago

Yes, but that's not the answer I expect, because I'm not in a context where I can loop in ruby. I'm not going through a ruby controller, there. The Coffeescript is triggered by a remote script triggered by a view. So there is no way I can loop in ruby. I need to loop in the Coffeescript .js.erb

Dave Newton Over a year ago

@cedric You're already in a context where you're using Ruby--what do you think <%= ... %> and escape_javascript are? It's an erb file.

cedric Over a year ago

OK, I just realised I could embed Coffeescript within Ruby code, as well as Ruby code within Coffeescript, INSIDE a .js.erb file. I had no idea it was possible to do this, I'm sorry. What is obvious to one is not to another, I'm afraid...Well, so now I learnt something BIG. Thanks !

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