calculate_button_trapezium.html.jst

   1 let querystring = require('querystring')
   2 let stream_buffers = require('stream-buffers')
   3
   4 return async env => {
   5   if (env.request.method == 'POST') {
   6     let write_stream = new stream_buffers.WritableStreamBuffer()
   7     let data = new Promise(
   8       (resolve, reject) => {
   9         write_stream.
  10         on('finish', () => {resolve(write_stream.getContents())}).
  11         on('error', () => {reject()})
  12       }
  13     )
  14     env.request.pipe(write_stream)
  15     let query = querystring.parse((await data).toString())
  16     let a_length = parseFloat(query.a_length)
  17     let b_length = parseFloat(query.b_length)
  18     let height = parseFloat(query.height)
  19     let area = (a_length + b_length) / 2 * height
  20
  21     let _out = []
  22     _out.push(
  23       `<!DOCTYPE html>
  24 <html>
  25 <head>
  26 <link rel="stylesheet" type="text/css" href="olly.css">
  27 <title>Calculation</title>
  28 </head>
  29 <body class="olly">
  30 <h1>The Height is: ${height} units</h1>
  31 <h1>The A length is: ${a_length} units</h1>
  32 <h1>The B length is: ${b_length} units</h1>
  33 <h1>The area is: ${area} units<sup>2</sup></h1>
  34 </body>
  35 </html>
  36 `
  37     )
  38     env.site.serve(
  39       env,
  40       200,
  41       Buffer.from(_out.join('')),
  42       'calculate_button_trapezium.html.jst'
  43     )
  44   }
  45   else {
  46     let _out = []
  47     _out.push(
  48       `<!DOCTYPE html>
  49 <html>
  50 <head>
  51 <link rel="stylesheet" type="text/css" href="olly.css">
  52 <title>Calculation</title>
  53 </head>
  54 <body class="olly">
  55 <h1>Error - Unable to Calculate</h1>
  56 </body>
  57 </html>
  58 `
  59     )
  60     env.site.serve(
  61       env,
  62       200,
  63       Buffer.from(_out.join('')),
  64       'calculatebutton.html.jst'
  65     )
  66   }
  67 }
  68