Vue Component-下拉選單一枚(with ajax data)

by cactus77kiki

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.10/vue.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/axios/0.19.0/axios.min.js"></script>
<div id="app">
  <country-ele v-bind:selected="3" v-on:changedata="getselection"></country-ele>
  <br/>
  <h2>Todos:</h2>
  <ol>
    <li v-for="todo in todos">
      <label>
        <input type="checkbox"
          v-on:change="toggle(todo)"
          v-bind:checked="todo.done">

        <del v-if="todo.done">
          {{ todo.text }}
        </del>
        <span v-else>
          {{ todo.text }}
        </span>
      </label>
    </li>
  </ol>
</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);
}

JavaScript

Vue.component('country-ele', {
  props: ['selected'],
  template: `<div>
  						<select 
              v-model="selection" 
              v-on:change="$emit('changedata',$event,$event.target.selectedIndex)">
  							<option v-for="l in list" v-bind:value="l.id">
                	{{l.title}}
                </option>
							</select>
             </div>`,  
  data: function () {
    return {
      message: 'Hello World!',
      selection: this.selected,
      list: [],      
    }
  },
  methods: {
    sayHi: function() {
      alert('Hi');
    },
    getData: function(){
    	var self = this;
    	axios.get('https://jsonplaceholder.typicode.com/todos')
    	.then(function (response) {
        //console.log(response.data);      		
        self.list = response.data;
    	})
    	.catch(function (error) {
        console.log(error);
    	});
    }    
  },
  created: function(){
  	this.getData();
  }
});
var app = new Vue({
  el: "#app",
  data: {
    todos: [
      { text: "Learn JavaScript", done: false },
      { text: "Learn Vue", done: false },
      { text: "Play around in JSFiddle", done: true },
      { text: "Build something awesome", done: true }
    ]
  },
  methods: {
  	getselection: function(event,selectedIndex){
    	//console.log(selectedIndex);
      console.log(event.target.selectedIndex);	//選取值
      console.log(event.target.value);	//bindvalue
      //console.log(event.target);	//html元素內容
      console.log(event.target.children[selectedIndex].text);	//取得
    },
  	toggle: function(todo){
    	todo.done = !todo.done
    }
  }
})