如何在 Vue 中更改道具时调用 Axios？

Question

On the change of the value id , I would like to make a JSON call via Axios and update necessary parts of the page. How do I do that? Currently, I have mounted and activated and they do not seem to be working...

Code:

const Home = { 
    template: `

    <div class="user">
        <h2>user {{ id }}</h2>
        <h2>{{ info }}</h2>
        bet
    </div>

    `,
    props: {
        id: {
            type:    String,
            default: 'N/A'
        }
    },
    data () {
        return {
          info: null
        }
      },
    activated () {
        axios
          .get('https://api.coindesk.com/v1/bpi/currentprice.json', 
          { params: { id: id }}
          )
          .then(response => (this.info = response))
      }, 

      mounted() {
        axios
          .get('https://api.coindesk.com/v1/bpi/currentprice.json')
          .then(response => (this.info = 'response'))
      } 
}`

Answer 1

You can listen to id prop change by using watch :

watch: {
  id: function(newId) {
    axios
      .get('https://api.coindesk.com/v1/bpi/currentprice.json',
           { params: { id: newId }}
      )
      .then(response => (this.info = response))
  }
}

---

Here is a little demo based on the code that you shared that shows how watch reacts to id prop change. Wrapper component below is solely for demonstration purpose as something that triggers id value change.

 const Home = { template: ` <div class="user"> <h2>user {{ id }}</h2> <h2>{{ info }}</h2> bet </div> `, props: { id: { default: 'N/A' } }, data () { return { info: null } }, mounted() { axios .get('https://api.coindesk.com/v1/bpi/currentprice.json') .then(response => (this.info = 'response')) }, watch: { id: function(newId) { console.log(`watch triggered, value of id is: ${newId}`); axios .get('https://api.coindesk.com/v1/bpi/currentprice.json', { params: { id: newId }} ) .then(response => (this.info = response)) } } } const Wrapper = { template: '<div><home :id="id" /></div>', components: { Home }, data() { return { id: 0 } }, mounted() { const limit = 5; const loop = (nextId) => setTimeout(() => { console.log(`#${nextId} loop iteration`); if (nextId < limit) { this.id = nextId; loop(nextId + 1); } }, 3000); loop(this.id); } } new Vue({ el: '#app', components: { Wrapper } })

 <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/axios/0.18.0/axios.min.js" ></script> <div id="app"> <wrapper /> </div>