index.html 2.08 KB
Newer Older
Kevin Lyda's avatar
Kevin Lyda committed
1
2
3
4
5
6
7
8
<!DOCTYPE html>
<html>
  <head>
  <meta charset="utf-8" />
    <title>Cube Root Training</title>
  </head>
  <body>
  <h1>Cube Root Training</h1>
Kevin Lyda's avatar
Kevin Lyda committed
9
10
11
  <p>
    <span style="white-space:nowrap;"><span style="font-size:larger;"
        >&#8731;</span><span id=cube style="text-decoration:overline;">
Kevin Lyda's avatar
Kevin Lyda committed
12
13
      </span>&nbsp;=&nbsp;
      <input type=number id=cuberoot value="" min=10 max=99>
Kevin Lyda's avatar
Kevin Lyda committed
14
15
    </span>
  </p>
Kevin Lyda's avatar
Kevin Lyda committed
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
  <p id=result></p>
  <p id=stats></p>

  <script>
var cube = document.getElementById("cube");
var cuberoot = document.getElementById("cuberoot");
var result = document.getElementById("result");
var stats = document.getElementById("stats");
var began;
var finished;
var elapsed = 0;
var generated;
var guesses = 0;
var correct = 0;

cuberoot.addEventListener("keydown", function (e) {
  if (e.keyCode === 13) {
    check_cuberoot(e);
  }
})

function humanize_ms(ms) {
  if (ms < 1000) {
    return ms + "ms";
  } else {
    return (Math.floor(ms / 100) / 10) + "s";
  }
}

function start_round() {
  if (guesses > 0) {
    stats.innerHTML = "Got " + correct + " correct out of " + guesses +
                      ". Last round took " + humanize_ms(finished - began) +
                      "." + ((correct > 0)
                          ?" Average time of correct guess was " +
                          humanize_ms(elapsed / correct) + "."
                          :"");
  }
  generated = Math.floor(Math.random() * 90) + 10;
Kevin Lyda's avatar
Kevin Lyda committed
55
  cube.innerHTML = "&nbsp;" + Math.pow(generated, 3) + "&nbsp;";
Kevin Lyda's avatar
Kevin Lyda committed
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
  began = Date.now();
  cuberoot.value = "";
  cuberoot.focus();
}

function check_cuberoot(e) {
  var guess = e.target.value;

  guesses++;
  finished = Date.now();
  if (guess == generated) {
    correct++;
    elapsed += (finished - began);
    result.innerHTML = "Correct!";
  } else {
Kevin Lyda's avatar
Kevin Lyda committed
71
72
73
74
75
    result.innerHTML = 'Not correct! <span style="white-space:nowrap;">' +
      '<span style="font-size:larger;">&#8731;</span>' +
      '<span style="text-decoration:overline;">&nbsp;' +
      Math.pow(generated, 3) +
      '&nbsp;</span> = ' + generated + '</span>.';
Kevin Lyda's avatar
Kevin Lyda committed
76
77
78
79
80
81
82
83
  }
  start_round();
}

start_round();
  </script>
  </body>
</html>