Convert ruby array to java script array

Question

I have a ruby code that will generate an array.I need to use that array in javascript.

<%= region.zip(min, max).select {|_, a, b| a == '0' && b == '0'}.map(&:first)%>;

This above code will generate an array like this

["A", "B", "C", "F", "H"]

Here is the demo http://repl.it/t03/680

I want to use this array in javascript. Below is what I tried and the error I got in console.

<script>

 var output = <%= (region.zip(min, max).select {|_, a, b| a == '0' && b == '0'}.map(&:first)).gsub('"', '') %>;

</script>

Error is

SyntaxError: expected expression, got '&'

var output = [&quot;A&quot;, &quot;B&quot;, &quot;C&quot;, &quot;F

Thanks

Jeremy Blalock · Accepted Answer · 2015-07-04 21:11:10Z

1

JSON is technically valid Javascript, so you could do something like:

 var output = <%= (region.zip(min, max).select {|_, a, b| a == '0' && b == '0'}.map(&:first)).map{|item| item.gsub('"', '')}.to_json %>;

And that should work as expected.

Note: I added the .to_json at the end of the Ruby code.

edited Jul 4, 2015 at 21:11

answered Jul 4, 2015 at 20:51

Jeremy Blalock

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6 Comments

TestingInProd Over a year ago

I tried ..got this error undefined method `gsub' for ["A", "B", "C", "F", "H"]:Array

Jeremy Blalock Over a year ago

Try removing the gsub(...). I think this is not actually needed.

Jeremy Blalock Over a year ago

Alternately, if your strings still have quotes in them you'd like to remove, you could run gsub inside another map. The reason you can't gsub on the whole array is because gsub can only be called on individual strings. So maybe you instead want to do something like ...).map{|item| item.gsub('"', '') }

TestingInProd Over a year ago

sorry..updated solution dint work..getting the original error

Jeremy Blalock Over a year ago

Ok, well then if all else fails, you can try wrapping the whole thing in raw(...) which should stop it from escaping the quotes. var output = <%= raw((regi...', '')}.to_json) %>;

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Francesco Belladonna · Accepted Answer · 2015-07-04 21:51:46Z

1

I used to do in the "standard" way, writing JS storing JSON in a variable, now I highly recommend to use: gon

It's great and allows you to handle with this situation easily, in your controller type:

gon.push({variable_name: [1,2,3]})

In your app layout use:

<%= include_gon %>
<!-- include your action js code -->

In your js you can just type:

console.log(gon.variable_name) // [1,2,3]

edited Jul 4, 2015 at 21:51

answered Jul 4, 2015 at 21:36

Francesco Belladonna

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Comments

TestingInProd · Accepted Answer · 2015-07-05 21:56:29Z

0

This is actually jeremy answer after modification.

 var output = <%= raw(region.zip(min, max).select {|_, a, b| a == '0' && b == '0'}.map(&:first).map{|item| item.gsub('"', '')}.to_json) %>

answered Jul 5, 2015 at 21:56

TestingInProd

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