summaryrefslogtreecommitdiffstats
path: root/sitestatic/homepage.js
blob: 67164222e4f11aa7547535b8ac6d2d4dd76342f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
"use strict";

(function() {
  const input = document.getElementById('pkgsearch-field');
  const form = document.getElementById('pkgsearch-form');
  var list;

  function resetResults() {
    if (!list) return;
    list.style.display = "none";
    list.innerHTML = "";
  }

  function getCompleteList() {
    if (!list) {
      list = document.createElement("UL");
      list.setAttribute("class", "pkgsearch-typeahead"); // remove
      form.appendChild(list);
      setListLocation();
    }
    return list;
  }

  function onListClick(e) {
      let target = e.target;
      while (!target.getAttribute('data-value')) {
        target = target.parentNode;
      }
      input.value = target.getAttribute('data-value');
      form.submit();
  }

  function setListLocation() {
    if (!list) return;
    const rects = input.getClientRects()[0];
    list.style.top = (rects.top + rects.height) + "px";
    list.style.left = rects.left + "px";
  }

  function loadData(data) {
    const letter = data[0];
    const pkgs = data[1].slice(0, 10); // Show maximum of 10 results

    resetResults();

    if (pkgs.length === 0) {
      return;
    }

    const ul = getCompleteList();
    ul.style.display = "block";
    const fragment = document.createDocumentFragment();

    for (let i = 0; i < pkgs.length; i++) {
      const item = document.createElement("li");
      const text = pkgs[i].replace(letter, '<b>' + letter + '</b>');
      item.innerHTML = '<a href="#">' + text + '</a>';
      item.setAttribute('data-value', pkgs[i]);
      fragment.appendChild(item);
    }

    ul.appendChild(fragment);
    ul.addEventListener('click', onListClick);
  }

  function fetchData(letter) {
    fetch('/opensearch/packages/suggest?q=' + letter).then(function(response) {
      return response.json();
    }).then(function(data) {
      loadData(data);
    });
  }

  function onInputClick() {
    if (input.value === "") {
      resetResults();
      return;
    }
    fetchData(input.value);
  }

  function onKeyDown(e) {
    if (!list) return;

    const elem = document.querySelector(".pkgsearch-typeahead li.active");
    switch(e.keyCode) {
      case 13: // enter
        if (elem) {
          input.value = elem.getAttribute('data-value');
          form.submit();
        } else {
          form.submit();
        }
        e.preventDefault();
        break;
      case 38: // up
        if (elem && elem.previousElementSibling) {
          elem.className = "";
          elem.previousElementSibling.className = "active";
        }
        e.preventDefault();
        break;
      case 40: // down
        if (elem && elem.nextElementSibling) {
          elem.className = "";
          elem.nextElementSibling.className = "active";
        } else if (!elem && list.childElementCount !== 0) {
          list.children[0].className = "active";
        }
        e.preventDefault();
        break;
    }
  }

  // debounce https://davidwalsh.name/javascript-debounce-function
  function debounce(func, wait, immediate) {
    var timeout;
    return function() {
      var context = this, args = arguments;
      var later = function() {
        timeout = null;
        if (!immediate) func.apply(context, args);
      };
      var callNow = immediate && !timeout;
      clearTimeout(timeout);
      timeout = setTimeout(later, wait);
      if (callNow) func.apply(context, args);
    };
  }

  input.addEventListener("input", onInputClick);
  input.addEventListener("keydown", onKeyDown);
  window.addEventListener('resize', debounce(setListLocation, 150));
  document.addEventListener("click", resetResults);
}());