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how to run ruby in haml in javascript definition?

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野趣味
野趣味 2021-02-07 23:56
  • how can I run ruby code inside javascript in haml?
  • if I use var = #{message} in my example I get undefined local variable or method message
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  • 礼貌的吻别
    2021-02-08 00:12

    The haml documentation for filters states that you can interpolate Ruby code using #{}

    - flavor = "raspberry"
#content
  :textile
    I *really* prefer _#{h flavor}_ jam.
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  • 孤独总比滥情好
    2021-02-08 00:22

    First, let's review what you seem to know:

    1. Ruby requires you to define local variables before you use them.
    2. You can run Ruby code on lines outside of a filter using - ....
    3. You use #{...} markup to interpolate Ruby code inside a filter.

    You say you want to run each, but presumably you want output from this; since the result of #{...} is turned into a string and put in your code, what you really want (probably) is map:

    %html
  %head
    :javascript
      var foo = [];
      #{
        limit = rand(4)+3
        array = (0..limit).to_a
        array.map{ |i| "foo[#{i}] = #{rand(12)};" }.join ' '
      }
      console.log(foo.length);
    %body

    Running the above code gives this output:

    <html>
  <head>
    <script type='text/javascript'>
      //<![CDATA[
        var foo = [];
        foo[0] = 2; foo[1] = 0; foo[2] = 11; foo[3] = 8; foo[4] = 0; foo[5] = 1;
      //]]>
    </script>
    <body></body>
  </head>
</html>

    As you can see, the big #{...} block (which may span multiple lines) runs arbitrary Ruby code. The result of the last expression (in this case the map{...}.join) is converted to a string and placed in the output.

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