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Task Board

Kanban-style task board with drag-and-drop columns that persists in the browser.

productivity
6 downloads

By Lucas

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name: Task Board description: "Kanban-style task board with drag-and-drop columns that persists in the browser." category: productivity connections: [] version: 1

What it does

Task Board is a Kanban-style board with To do, Doing, and Done columns for managing work visually.

Use it to add tasks, drag cards between columns as work progresses, and delete finished cards.

It outputs a persistent personal task board: all cards and their columns are saved in the browser's local storage automatically.

Setup

  • Open app.html directly in any modern browser (no server or internet needed)
  • Type a task in the input bar, pick a column, and click Add
  • Drag cards between columns; cards persist automatically across sessions

Source

app.html — the complete app (single self-contained file: HTML, CSS, and JavaScript, no external dependencies):

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Task Board</title>
<style>
:root{
  --bg:#0f172a; --bg2:#1e293b; --ink:#e2e8f0; --muted:#94a3b8;
  --card:#ffffff; --card-ink:#0f172a;
  --accent:#38bdf8; --accent-dark:#0284c7;
  --todo:#f59e0b; --doing:#3b82f6; --done:#22c55e;
  --danger:#ef4444;
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:linear-gradient(135deg,var(--bg),var(--bg2));
  color:var(--ink); min-height:100vh; padding:24px 16px;
}
.wrap{max-width:1100px;margin:0 auto}
header{text-align:center;margin-bottom:24px}
header h1{font-size:2rem;letter-spacing:.5px}
header p{color:var(--muted);margin-top:6px}
.addbar{
  display:flex;gap:10px;max-width:640px;margin:0 auto 24px;flex-wrap:wrap;
}
.addbar input{
  flex:1;min-width:200px;padding:12px 14px;border-radius:10px;border:1px solid #334155;
  background:#1e293b;color:var(--ink);font-size:1rem;
}
.addbar input:focus{outline:2px solid var(--accent)}
.addbar select{
  padding:12px;border-radius:10px;border:1px solid #334155;background:#1e293b;
  color:var(--ink);font-size:1rem;
}
.addbar button{
  padding:12px 20px;border:none;border-radius:10px;cursor:pointer;
  background:var(--accent);color:#082f49;font-weight:700;font-size:1rem;
}
.addbar button:hover{background:#7dd3fc}
.board{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.col{
  background:#1e293b;border-radius:14px;padding:12px;min-height:300px;
  display:flex;flex-direction:column;gap:10px;
  border-top:5px solid var(--todo);
}
.col[data-col="doing"]{border-top-color:var(--doing)}
.col[data-col="done"]{border-top-color:var(--done)}
.col h2{font-size:1.05rem;display:flex;justify-content:space-between;align-items:center;padding:2px 4px}
.count{background:#0f172a;border-radius:20px;padding:2px 10px;font-size:.8rem;color:var(--muted)}
.dropzone{flex:1;display:flex;flex-direction:column;gap:10px;min-height:80px;border-radius:10px}
.dropzone.over{background:#0f172a;outline:2px dashed var(--accent)}
.card{
  background:var(--card);color:var(--card-ink);border-radius:10px;padding:12px 14px;
  cursor:grab;position:relative;box-shadow:0 2px 8px rgba(0,0,0,.35);
  font-size:.95rem;line-height:1.4;word-wrap:break-word;
}
.card:active{cursor:grabbing}
.card.dragging{opacity:.4}
.card .del{
  position:absolute;top:6px;right:8px;border:none;background:none;cursor:pointer;
  color:#94a3b8;font-size:1.1rem;line-height:1;padding:2px 4px;border-radius:6px;
}
.card .del:hover{color:var(--danger);background:#fee2e2}
.card.done-card{text-decoration:none;border-left:5px solid var(--done)}
.card small{color:#64748b;display:block;margin-top:6px;font-size:.75rem}
footer{text-align:center;color:var(--muted);font-size:.8rem;margin-top:28px}
@media(max-width:720px){.board{grid-template-columns:1fr}}
</style>
</head>
<body>
<div class="wrap">
  <header>
    <h1>Task Board</h1>
    <p>Kanban board — drag cards between columns. Everything saves automatically.</p>
  </header>

  <div class="addbar">
    <input id="newTask" type="text" placeholder="New task…" maxlength="200" onkeydown="addOnEnter(event)">
    <select id="newCol" aria-label="Column">
      <option value="todo">To do</option>
      <option value="doing">Doing</option>
      <option value="done">Done</option>
    </select>
    <button onclick="addTask()">Add</button>
  </div>

  <div class="board">
    <div class="col" data-col="todo">
      <h2>To do <span class="count" id="count-todo">0</span></h2>
      <div class="dropzone" id="zone-todo" ondragover="allowDrop(event)" ondragleave="leaveDrop(event)" ondrop="drop(event)"></div>
    </div>
    <div class="col" data-col="doing">
      <h2>Doing <span class="count" id="count-doing">0</span></h2>
      <div class="dropzone" id="zone-doing" ondragover="allowDrop(event)" ondragleave="leaveDrop(event)" ondrop="drop(event)"></div>
    </div>
    <div class="col" data-col="done">
      <h2>Done <span class="count" id="count-done">0</span></h2>
      <div class="dropzone" id="zone-done" ondragover="allowDrop(event)" ondragleave="leaveDrop(event)" ondrop="drop(event)"></div>
    </div>
  </div>

  <footer>Cards and columns persist in your browser's local storage.</footer>
</div>

<script>
var STORAGE_KEY = "taskBoardStateV1";
var COLUMNS = ["todo", "doing", "done"];
var state = { todo: [], doing: [], done: [] };

function uid() {
  return "c" + Date.now().toString(36) + Math.floor(Math.random() * 1e6).toString(36);
}

function seedState() {
  state.todo = [
    { id: uid(), text: "Draft quarterly report outline", created: Date.now() },
    { id: uid(), text: "Water the office plants", created: Date.now() }
  ];
  state.doing = [
    { id: uid(), text: "Review mockups for the new landing page", created: Date.now() }
  ];
  state.done = [];
}

function loadState() {
  try {
    var raw = localStorage.getItem(STORAGE_KEY);
    if (raw) {
      var parsed = JSON.parse(raw);
      COLUMNS.forEach(function (c) {
        if (Array.isArray(parsed[c])) state[c] = parsed[c];
      });
      return;
    }
  } catch (e) { /* ignore corrupt state */ }
  seedState();
  saveState();
}

function saveState() {
  try { localStorage.setItem(STORAGE_KEY, JSON.stringify(state)); } catch (e) { /* storage full */ }
}

function esc(str) {
  var div = document.createElement("div");
  div.appendChild(document.createTextNode(str));
  return div.innerHTML;
}

function fmtDate(ts) {
  try { return new Date(ts).toLocaleDateString(undefined, { month: "short", day: "numeric" }); }
  catch (e) { return ""; }
}

function render() {
  COLUMNS.forEach(function (col) {
    var zone = document.getElementById("zone-" + col);
    zone.innerHTML = "";
    state[col].forEach(function (card) {
      var el = document.createElement("div");
      el.className = "card" + (col === "done" ? " done-card" : "");
      el.draggable = true;
      el.dataset.id = card.id;
      el.dataset.col = col;
      el.ondragstart = dragStart;
      el.ondragend = dragEnd;
      var del = document.createElement("button");
      del.className = "del";
      del.title = "Delete";
      del.textContent = "×";
      del.setAttribute("aria-label", "Delete task");
      del.onclick = function (ev) { ev.stopPropagation(); deleteTask(card.id); };
      var body = document.createElement("div");
      body.innerHTML = esc(card.text);
      var meta = document.createElement("small");
      meta.textContent = "Added " + fmtDate(card.created);
      el.appendChild(del);
      el.appendChild(body);
      el.appendChild(meta);
      zone.appendChild(el);
    });
    document.getElementById("count-" + col).textContent = state[col].length;
  });
}

function addTask() {
  var input = document.getElementById("newTask");
  var text = input.value.trim();
  if (!text) return;
  var col = document.getElementById("newCol").value;
  if (COLUMNS.indexOf(col) === -1) col = "todo";
  state[col].push({ id: uid(), text: text, created: Date.now() });
  input.value = "";
  input.focus();
  saveState();
  render();
}

function addOnEnter(ev) {
  if (ev.key === "Enter") addTask();
}

function findCard(id) {
  for (var i = 0; i < COLUMNS.length; i++) {
    var col = COLUMNS[i];
    for (var j = 0; j < state[col].length; j++) {
      if (state[col][j].id === id) return { col: col, index: j, card: state[col][j] };
    }
  }
  return null;
}

function deleteTask(id) {
  var found = findCard(id);
  if (!found) return;
  if (!confirm("Delete this task?")) return;
  state[found.col].splice(found.index, 1);
  saveState();
  render();
}

var dragId = null;

function dragStart(ev) {
  dragId = ev.target.dataset.id;
  ev.target.classList.add("dragging");
  ev.dataTransfer.effectAllowed = "move";
  try { ev.dataTransfer.setData("text/plain", dragId); } catch (e) {}
}

function dragEnd(ev) {
  ev.target.classList.remove("dragging");
  dragId = null;
}

function allowDrop(ev) {
  ev.preventDefault();
  ev.dataTransfer.dropEffect = "move";
  ev.currentTarget.classList.add("over");
}

function leaveDrop(ev) {
  ev.currentTarget.classList.remove("over");
}

function drop(ev) {
  ev.preventDefault();
  ev.currentTarget.classList.remove("over");
  var id = dragId;
  try { id = id || ev.dataTransfer.getData("text/plain"); } catch (e) {}
  if (!id) return;
  var found = findCard(id);
  if (!found) return;
  var zone = ev.currentTarget;
  var targetCol = zone.id.replace("zone-", "");
  if (COLUMNS.indexOf(targetCol) === -1) return;
  if (found.col === targetCol) return;
  state[found.col].splice(found.index, 1);
  state[targetCol].push(found.card);
  saveState();
  render();
}

loadState();
render();
</script>
</body>
</html>

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