Passing an array from javascript to ruby with sinatra

Question

What I want to accomplish is to pass a 2D array from javascript to something that ruby will recognize. All objects are strings

I have been using gon-sinatra, but it doesn't do exactly what I need. I can pass store the string I want to pass as gon.text doing

@temp = gon.text
array.push(@temp)

This doesn't work because it shows gon.text as a nil object type, when I want it as a string. gon.text.to_s returns an empty string, so when I try to display it, nothing happens. alert("<%= @temp %>") // displays an empty string

I'm at a bit of a loss here and don't know the best way to approach this. Would it be better to store the array as a json, and then read in the json using ruby instead?

7stud · Accepted Answer · 2015-04-20 04:42:52Z

2

Yes. Convert your array to json(a string) with js:

var data = JSON.stringify(yourArray);

Send the string to your ruby script. Then parse the string into an Array with ruby:

require 'json'

arr = JSON.parse(the_string)

answered Apr 20, 2015 at 4:42

7stud

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Leah Zorychta · Accepted Answer · 2015-04-20 05:00:01Z

In Javascript you do something like the following:

var myArray = [ ['str1','str2'], ['str3','str4'] ];
$.get('/endpoint', { myArray: myArray })

And your endpoint with sinatra would be:

get 'endpoint' do
    myArrayStr = params[:myArray]
    error!('invalid array') unless myArrayStr
    @myArray = JSON.parse(myArrayStr)
    gon.rabl 'goners/yourFile.rabl', :instance => self
end

And in your gon file you would reference this with:

alert(gon.myArray[0][0]); // str1

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