Vue key in depth

Change key to i, todo.text or Math.Random

by Max Sinev

HTML

<div id="app">
  <h2>Todos:</h2>
  <ol>
    <li v-for="(todo, i) in todos" :key="todo.text">
      <label>
        <input type="text" ref="inputs">

        <del v-if="todo.done">
          {{ todo.text }}
        </del>
        <span v-else>
          {{ todo.text }}
        </span>
      </label>
    </li>
  </ol>
  <button @click="addFirst">Add</button>
  <button @click="newTodos">New</button>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
  el: "#app",
  data: {
    todos: [
      { text: 1, done: false },
      { text: 2, done: false },
      { text: 3, done: false },
      { text: 4, done: false }
    ], inputIndexes: []
  },
  mounted() {
  	this.$nextTick(() => {
    	this.inputIndexes = this.$refs.inputs.map((i, ii) => {
      	i._index = ii;
        i.value = i._index;
        return ii;
			});
      console.log(this.inputIndexes);
    })
  },
  methods: {
  	newTodos: function() {
    	this.todos = [
      { text: 6, done: false },
      { text: 7, done: false },
      { text: 8, done: false },
      { text: 9, done: false }
    ]
    this.$nextTick(() => {
      	this.inputIndexes = this.$refs.inputs.map((i) => {
        	i.value = i._index;
          return i;
        })
        console.log(this.inputIndexes);
      })
    },
  	addFirst: function(){
    	this.todos.splice(0, 0, { text: Math.random(), done: false });
      this.$nextTick(() => {
      	this.inputIndexes = this.$refs.inputs.map((i) => {
        	i.value = i._index;
          return i._index;
        })
        console.log(this.inputIndexes);
      })
    }
  }
})