I added a "Delete completed tasks" button in index.html

mshayriyesaricicek · mshayriyesaricicek · commit 86c8c8e45487 · 2026-04-04T18:37:00.000+01:00
I wrote a function called deleteCompleted (toolList) for tool.mjs
I wrote extra tests in todos.tes.mjs
I called deleteCompleted() in script.js
diff --git a/Sprint-3/todo-list/index.html b/Sprint-3/todo-list/index.html
@@ -1,40 +1,51 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
-<head>
-  <meta charset="UTF-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
-  <title>ToDo List</title>
-  <link rel="stylesheet" href="style.css" />
-  <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>ToDo List</title>
+    <link rel="stylesheet" href="style.css" />
+    <link
+      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css"
+      rel="stylesheet"
+    />
 
-  <script type="module" src="script.mjs"></script>
-</head>
-<body>
-  <div class="todo-container">
-    <h1>My ToDo List</h1>
+    <script type="module" src="script.mjs"></script>
+  </head>
+  <body>
+    <div class="todo-container">
+      <h1>My ToDo List</h1>
 
-    <div class="todo-input">
-      <input type="text" id="new-task-input" placeholder="Enter a new task..." />
-      <button id="add-task-btn">Add</button>
-    </div>
+      <div class="todo-input">
+        <input
+          type="text"
+          id="new-task-input"
+          placeholder="Enter a new task..."
+        />
+        <button id="add-task-btn">Add</button>
+        <button id="delete-completed-btn">Delete Completed Tasks</button>
+      </div>
 
-    <ul id="todo-list" class="todo-list">      
-    </ul>
+      <ul id="todo-list" class="todo-list"></ul>
 
-    <!-- 
+      <!-- 
       This is a template for the To-do list item. 
       It can simplify the creation of list item node in JS script.
     -->
-    <template id="todo-item-template">
-      <li class="todo-item"> <!-- include class "completed" if the task completed state is true -->
-        <span class="description">Task description</span>
-        <div class="actions">
-          <button class="complete-btn"><span class="fa-solid fa-check" aria-hidden="true"></span></button>
-          <button class="delete-btn"><span class="fa-solid fa-trash" aria-hidden="true"></span></button>
-        </div>
-      </li>
-    </template>
-
-  </div>
-</body>
+      <template id="todo-item-template">
+        <li class="todo-item">
+          <!-- include class "completed" if the task completed state is true -->
+          <span class="description">Task description</span>
+          <div class="actions">
+            <button class="complete-btn">
+              <span class="fa-solid fa-check" aria-hidden="true"></span>
+            </button>
+            <button class="delete-btn">
+              <span class="fa-solid fa-trash" aria-hidden="true"></span>
+            </button>
+          </div>
+        </li>
+      </template>
+    </div>
+  </body>
 </html>
diff --git a/Sprint-3/todo-list/script.mjs b/Sprint-3/todo-list/script.mjs
@@ -1,28 +1,51 @@
-// Store everything imported from './todos.mjs' module as properties of an object named Todos 
+// Store everything imported from './todos.mjs' module as properties of an object named Todos
 import * as Todos from "./todos.mjs";
 
 // To store the todo tasks
-const todos = [];
+let todos = [];
+
+if (typeof localStorage !== "undefined") {
+  const savedTodos = localStorage.getItem("todos");
+  if (savedTodos) {
+    todos = JSON.parse(savedTodos);
+  }
+}
+
+// Save function
+function saveTodos() {
+  if (typeof localStorage !== "undefined") {
+    localStorage.setItem("todos", JSON.stringify(todos));
+  }
+}
 
 // Set up tasks to be performed once on page load
 window.addEventListener("load", () => {
   document.getElementById("add-task-btn").addEventListener("click", addNewTodo);
-
-  // Populate sample data
-  Todos.addTask(todos, "Wash the dishes", false); 
-  Todos.addTask(todos, "Do the shopping", true);
-
+  document
+    .getElementById("delete-completed-btn")
+    .addEventListener("click", () => {
+      // Delete all tasks marked as completed
+      Todos.deleteCompleted(todos);
+      saveTodos();
+      render();
+    });
+
+  // Only populate sample data if nothing is saved`
+  if (todos.length === 0) {
+    Todos.addTask(todos, "Wash the dishes", false);
+    Todos.addTask(todos, "Do the shopping", true);
+  }
   render();
 });
 
-
-// A callback that reads the task description from an input field and 
+// A callback that reads the task description from an input field and
 // append a new task to the todo list.
 function addNewTodo() {
   const taskInput = document.getElementById("new-task-input");
   const task = taskInput.value.trim();
   if (task) {
     Todos.addTask(todos, task, false);
+    saveTodos();
     render();
   }
 
@@ -45,12 +68,11 @@ function render() {
   });
 }
 
-
 // Note:
 // - First child of #todo-item-template is a <li> element.
 //   We will create each ToDo list item as a clone of this node.
 // - This variable is declared here to be close to the only function that uses it.
-const todoListItemTemplate = 
+const todoListItemTemplate =
   document.getElementById("todo-item-template").content.firstElementChild;
 
 // Create a <li> element for the given todo task
@@ -62,15 +84,17 @@ function createListItem(todo, index) {
     li.classList.add("completed");
   }
 
-  li.querySelector('.complete-btn').addEventListener("click", () => {
+  li.querySelector(".complete-btn").addEventListener("click", () => {
     Todos.toggleCompletedOnTask(todos, index);
+    saveTodos();
     render();
   });
-    
-  li.querySelector('.delete-btn').addEventListener("click", () => {
+
+  li.querySelector(".delete-btn").addEventListener("click", () => {
     Todos.deleteTask(todos, index);
+    saveTodos();
     render();
   });
 
   return li;
-}
+}
diff --git a/Sprint-3/todo-list/style.css b/Sprint-3/todo-list/style.css
@@ -39,9 +39,9 @@ h1 {
 }
 
 .todo-input button {
-  padding: 10px 20px;
+  padding: 10px;
   font-size: 16px;
-  background-color: #4CAF50;
+  background-color: #4caf50;
   color: white;
   border: none;
   border-radius: 6px;
diff --git a/Sprint-3/todo-list/todos.mjs b/Sprint-3/todo-list/todos.mjs
@@ -26,4 +26,12 @@ export function toggleCompletedOnTask(todos, taskIndex) {
   if (todos[taskIndex]) {
     todos[taskIndex].completed = !todos[taskIndex].completed;
   }
-}
+}
+// Delete completed tasks
+export function deleteCompleted(todos) {
+  for (let i = todos.length - 1; i >= 0; i--) {
+    if (todos[i].completed) {
+      todos.splice(i, 1);
+    }
+  }
+}
diff --git a/Sprint-3/todo-list/todos.test.mjs b/Sprint-3/todo-list/todos.test.mjs
@@ -13,7 +13,7 @@ function createMockTodos() {
     { task: "Task 1 description", completed: true },
     { task: "Task 2 description", completed: false },
     { task: "Task 3 description", completed: true },
-    { task: "Task 4 description", completed: false },        
+    { task: "Task 4 description", completed: false },
   ];
 }
 
@@ -29,7 +29,6 @@ describe("addTask()", () => {
   });
 
   test("Should append a new task to the end of a ToDo list", () => {
-
     const todos = createMockTodos();
     const lengthBeforeAddition = todos.length;
     Todos.addTask(todos, theTask.task, theTask.completed);
@@ -42,7 +41,6 @@ describe("addTask()", () => {
 });
 
 describe("deleteTask()", () => {
-
   test("Delete the first task", () => {
     const todos = createMockTodos();
     const todosBeforeDeletion = createMockTodos();
@@ -53,7 +51,7 @@ describe("deleteTask()", () => {
 
     expect(todos[0]).toEqual(todosBeforeDeletion[1]);
     expect(todos[1]).toEqual(todosBeforeDeletion[2]);
-    expect(todos[2]).toEqual(todosBeforeDeletion[3]);        
+    expect(todos[2]).toEqual(todosBeforeDeletion[3]);
   });
 
   test("Delete the second task (a middle task)", () => {
@@ -66,7 +64,7 @@ describe("deleteTask()", () => {
 
     expect(todos[0]).toEqual(todosBeforeDeletion[0]);
     expect(todos[1]).toEqual(todosBeforeDeletion[2]);
-    expect(todos[2]).toEqual(todosBeforeDeletion[3]);        
+    expect(todos[2]).toEqual(todosBeforeDeletion[3]);
   });
 
   test("Delete the last task", () => {
@@ -79,7 +77,7 @@ describe("deleteTask()", () => {
 
     expect(todos[0]).toEqual(todosBeforeDeletion[0]);
     expect(todos[1]).toEqual(todosBeforeDeletion[1]);
-    expect(todos[2]).toEqual(todosBeforeDeletion[2]);        
+    expect(todos[2]).toEqual(todosBeforeDeletion[2]);
   });
 
   test("Delete a non-existing task", () => {
@@ -94,7 +92,6 @@ describe("deleteTask()", () => {
 });
 
 describe("toggleCompletedOnTask()", () => {
-
   test("Expect the 'completed' property to toggle on an existing task", () => {
     const todos = createMockTodos();
     const taskIndex = 1;
@@ -111,13 +108,12 @@ describe("toggleCompletedOnTask()", () => {
     const todos = createMockTodos();
     const todosBeforeToggle = createMockTodos();
     Todos.toggleCompletedOnTask(todos, 1);
-    
-    expect(todos[0]).toEqual(todosBeforeToggle[0]);    
+
+    expect(todos[0]).toEqual(todosBeforeToggle[0]);
     expect(todos[2]).toEqual(todosBeforeToggle[2]);
     expect(todos[3]).toEqual(todosBeforeToggle[3]);
   });
 
-
   test("Expect no change when toggling on a non-existing task", () => {
     const todos = createMockTodos();
     const todosBeforeToggle = createMockTodos();
@@ -130,3 +126,37 @@ describe("toggleCompletedOnTask()", () => {
   });
 });
 
+describe("deleteCompleted()", () => {
+  test("Expect all completed tasks to be deleted", () => {
+    const todos = createMockTodos();
+    Todos.deleteCompleted(todos);
+
+    expect(todos).toHaveLength(2);
+    expect(todos[0]).toEqual({ task: "Task 2 description", completed: false });
+    expect(todos[1]).toEqual({ task: "Task 4 description", completed: false });
+  });
+
+  test("Expect no change if there is no completed task", () => {
+    const todos = [
+      { task: "Task A description", completed: false },
+      { task: "Task B description", completed: false },
+    ];
+    const todosBeforeDeletion = [
+      { task: "Task A description", completed: false },
+      { task: "Task B description", completed: false },
+    ];
+
+    Todos.deleteCompleted(todos);
+    expect(todos).toEqual(todosBeforeDeletion);
+  });
+
+  test("Expect all tasks to be deleted if all tasks are completed", () => {
+    const todos = [
+      { task: "Task A description", completed: true },
+      { task: "Task B description", completed: true },
+    ];
+
+    Todos.deleteCompleted(todos);
+    expect(todos).toHaveLength(0);
+  });
+});
