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Rails 3 passing a rails array to javascript function which uses a javascript array

rated 0 times [ 8] [ 7] / answers: 1 / hits: 17783 / 13 Years ago, thu, august 25, 2011, 12:00:00

I am trying to pass a rails array to a javascript function. The function will then use the array values in javascript so I need to keep it an array.

Here is how I am passing my array:

graphit([<%=@mpg_values.join(,) %>])

This produces this in the HTML

graphit([#&lt;Mile:0x6ff0cf0&gt;,#&lt;Mile:0x6ff0c18&gt;,#&lt;Mile:0x6ff0b58&gt;])

Which are not the values, they should be decimal numbers. I assume this is because it is a reference to the array so that I why I am getting the messed up values. If I do something like to_s I see the values but it has other stuff like the table and filed name in there as well.

Anybody know how I can get this rails array to a javascript function as an array?

Thanks in advance for any help.

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calicinthias

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1 Year ago

answered 13 Years ago benitoh · Accepted Answer

Going to JSON as suggested a couple times in this post always gave me something like this.

[{mile:{date:2011-05-20,mpg:18.565887006952}},{mile:{date:2011-06-01,mpg:18.471164309032}}]

What I really wanted was just this... [[2011-05-20, 18.56][2011-06-01, 18.47]]

So I handled it with a helper like so.

  def chart_values()

    @chart_values = '['

    @mpg_values.each do |m|

      @chart_values = @chart_values+'['+m.date.to_s+', '+m.mpg.round(2).to_s+'],'

    end

    @chart_values = @chart_values+']'

  end

Then passed chart_values() to the javascript.

Likely not the best solution but it gave me the desired values in the format I needed.