Welcome folks today in this post we will making a todo app in vue.js 2020all the source code of the application is given below. A step by step youtube video is shown below.
Get Started
Create the Vue.js Project inside your project directory by the following command
vue create todoapp
Now go to the project Directory and run the following commands on command line
cd todoapp
npm run serve
Now your vue.js app will be started on port 8080
Now open the text editor and edit the App.vue file like this
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<template> <div> <AddTodo/> <Todos/> </div> </template> <script> import Todos from './components/Todos'; import AddTodo from './components/AddTodo' export default { name: 'App', data(){ return { todos:[ { id:1, title:"todo 1", completed:false }, { id:2, title:"todo 2", completed:true }, { id:3, title:"todo 3", completed:false }, { id:4, title:"todo 4", completed:true } ] } }, components: { Todos, AddTodo }, </script> |
Reading Todos
Now inside this App.vue we have included two custom components inside our template which is Todos component and the AddTodo component which will be responsible for adding a new Todo from a form.
Now inside your components folder you need to create these components.
Todos.vue
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<template> <div> <div v-bind:key="todo.id" v-for="todo in todos"> <TodoItem v-bind:todo="todo" /> </div> </div> </template> <script> import TodoItem from './TodoItem.vue'; export default { name: "Todos", components: { TodoItem }, props: ["todos"] } </script> <style scoped> </style> |
Here we are taking all the todos which are present and we are looping through it by using the v-for directive and here again we are using a custom component again which is TodoItem component
TodoItem.vue
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<template> <div class="container"> <div class="todo-item" v-bind:class="{'is-complete':todo.completed}"> <p> <input type="checkbox" v-on:change="markComplete" v-bind:checked="todo.completed"> {{todo.title}} <button class="del">x</button> </p> </div> </div> </template> <script> export default { name: "TodoItem", props: ["todo"], methods: { markComplete() { this.todo.completed = !this.todo.completed; } } } </script> <style scoped> .todo-item { background: #f4f4f4; padding: 10px; margin:20px; border-bottom: 1px #ccc dotted; } .is-complete { text-decoration: line-through; } .del { background: #ff0000; color: #fff; border: none; padding: 5px 9px; border-radius: 50%; cursor: pointer; float: right; } </style> |
Now if you run the app it should look something like this as shown below
Now we need to create AddTodo component which will contain a simple form to submit a new Todo inside the app
AddTodo.vue
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<template> <div class="container"> <br> <h1 class="text-center">Todos App</h1> <br><br> <form> <div class="form-group"> <input required type="text" v-model="title" placeholder="title" name="title" id="" class="form-control"> </div> <div class="form-group"> <button class="btn btn-block btn-danger"> Add Todo </button> </div> </form> </div> </template> <script> export default { name: "AddTodo", data() { return { title: '' } } } </script> <style scoped> </style> |
Now if you run the app you will see the form also
Adding Todo
Now we will be adding a new Todo inside the app by making the form work. To do that we will be adding a @submit directive to the form like this
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<form @submit="addTodo"> <div class="form-group"> <input required type="text" v-model="title" placeholder="title" name="title" id="" class="form-control"> </div> <div class="form-group"> <button class="btn btn-block btn-danger"> Add Todo </button> </div> |
Now we need to define this function which will execute once the form submits. Now inside the script section copy paste this code
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export default { name: "AddTodo", data() { return { title: '' } }, methods: { addTodo(e) { e.preventDefault() const newTodo = { id:Date.now(), title: this.title, completed: false } // Send up to parent this.$emit('add-todo', newTodo); this.title = ''; } } } |
So now inside this we are making a new Todo from the values which are submitted namely id which is auto generated by using the Date function and the title of the todo and a third property completed which is default set to false
Now after that we are emitting a new event add-todo which will automatically go to the parent element in this case App.vue So now we need to catch this event which is passed from the child component
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<AddTodo v-on:add-todo="addTodo"/> |
Here we are using a special directive v:on to get the event which is sent and now we have defined a custom method AddTodo which will be executed to add a Todo
App.vue
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addTodo(newTodo){ this.todos = [...this.todos,newTodo] } |
Deleting Todos
Now we will be using the same concept to delete the todos as well for this go to the TodoItem.vue file and make some changes like below
TodoItem.vue
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<button @click="$emit('del-todo', todo.id)" class="del">x</button> |
So here we are assigning a button click listener by using @click and we are emitting the event del-todo
So now we need to catch this in Todos.vue file
Todos.vue
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<TodoItem v-bind:todo="todo" v-on:del-todo="$emit('del-todo', todo.id)" /> |
And now again we need to emit this in App.vue parent component like this
App.vue
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<Todos v-bind:todos="todos" v-on:del-todo="deleteTodo"/> |
Now we need to define this custom function deleteTodo which will be executed to actually delete the todo from the todos array
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deleteTodo(id){ this.todos = this.todos.filter((todo) => todo.id !== id) } |
Now inside this block of code we are using the es6 high order function filter to delete the todo from the array.
Full Source Code
App.vue
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<template> <div> <AddTodo v-on:add-todo="addTodo"/> <Todos v-bind:todos="todos" v-on:del-todo="deleteTodo"/> </div> </template> <script> import Todos from './components/Todos'; import AddTodo from './components/AddTodo' export default { name: 'App', data(){ return { todos:[ { id:1, title:"todo 1", completed:false }, { id:2, title:"todo 2", completed:true }, { id:3, title:"todo 3", completed:false }, { id:4, title:"todo 4", completed:true } ] } }, components: { Todos, AddTodo }, methods:{ addTodo(newTodo){ this.todos = [...this.todos,newTodo] }, deleteTodo(id){ this.todos = this.todos.filter((todo) => todo.id !== id) } } }; </script> |
AddTodo.vue
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<template> <div class="container"> <br> <h1 class="text-center">Todos App</h1> <br><br> <form @submit="addTodo"> <div class="form-group"> <input required type="text" v-model="title" placeholder="title" name="title" id="" class="form-control"> </div> <div class="form-group"> <button class="btn btn-block btn-danger"> Add Todo </button> </div> </form> </div> </template> <script> export default { name: "AddTodo", data() { return { title: '' } }, methods: { addTodo(e) { e.preventDefault() const newTodo = { id:Date.now(), title: this.title, completed: false } // Send up to parent this.$emit('add-todo', newTodo); this.title = ''; } } } </script> <style scoped> </style> |
Todos.vue
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<template> <div> <div v-bind:key="todo.id" v-for="todo in todos"> <TodoItem v-bind:todo="todo" v-on:del-todo="$emit('del-todo', todo.id)" /> </div> </div> </template> <script> import TodoItem from './TodoItem.vue'; export default { name: "Todos", components: { TodoItem }, props: ["todos"] } </script> <style scoped> </style> |
TodoItem.vue
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<template> <div class="container"> <div class="todo-item" v-bind:class="{'is-complete':todo.completed}"> <p> <input type="checkbox" v-on:change="markComplete" v-bind:checked="todo.completed"> {{todo.title}} <button @click="$emit('del-todo', todo.id)" class="del">x</button> </p> </div> </div> </template> <script> export default { name: "TodoItem", props: ["todo"], methods: { markComplete() { this.todo.completed = !this.todo.completed; } } } </script> <style scoped> .todo-item { background: #f4f4f4; padding: 10px; margin:20px; border-bottom: 1px #ccc dotted; } .is-complete { text-decoration: line-through; } .del { background: #ff0000; color: #fff; border: none; padding: 5px 9px; border-radius: 50%; cursor: pointer; float: right; } </style> |
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