javascript - Vue.js 父 <-> 子更新值，路由 View

Question

我在 subview 中更新父属性时遇到问题。就我而言，参赛者是家长，编辑参赛者应该是 child 。 Contestant.vue 应该存储(是的，答案可能就在这里 - 存储在 Vuex 中)用户信息，而 EditContestant 应该只渲染编辑 View ，允许编辑用户信息操作并通过自己的方法或父方法保存它。我已经包含了路由，因此您应该明白我在说什么。

结构是:

Contestant.vue
|-EditContestant.Vue

参赛者.vue:

<script>
    export default {
        data() {
            return {
                contestant: {
                    id: this.$route.params.id,
                    gender: '',
                    firstname: '',
                    lastname: '',
                },
            }
        },
    methods: {
            fetchContestant(id) {
        //some api call here                            
              vm.updatePropContestant(res.data);
        // ...
            },
            updatePropContestant(newData) {
                if (!this.contestant || this.contestant.length === 0) {
                    this.contestant = {};
                }
                this.contestant.firstname = newData.firstname;
                this.contestant.lastname = newData.lastname;
                this.contestant.id = newData.id;
                this.contestant.gender = newData.gender;
                // this.$forceUpdate();
            },
        },
        }
</script>
<template>
    <div>
        <router-view :contestant="contestant"  @interface="contestant = $event"></router-view>
    </div>
</template>

EditContestant.vue

<script>
    export default {
        data() {
            console.log('data');
            return {
                editContestant: {
                    id: '',
                    'firstname': '',
                    'lastname': '',
                    'gender': 0
                },
                edit: false
            }
        },
        props: ['contestant'],
        created: function () {
// tried also to fetchContestant if parent beforeCreate method with same result, so tried moving it here :(
            this.$parent.fetchContestant(this.$route.params.id);
        }
    }
</script>

<template>
<div class="col">
<input id="firstname" v-model="this.$parent.contestant.firstname" type="text" class="form-control"                                placeholder="First name" 
<!-- this doesn't help either v-on:input="updateParentValue($event.target.value)" --> >
                </div>
</template>

app.js

require('./bootstrap');
window.Vue = require('vue');
import router from './router';
new Vue({
    el: "#app",
    router,
    // render: h => h(app)
});

路由器/index.js

import contestantComponent from '../components/Contestant/Contestant'
import contestantEditComponent from '../components/Contestant/EditContestant'
Vue.use(Router)
export default new Router({
    routes: [
        {
            path: '/contestant/:id',
            component: contestantComponent,
            children: [
                {

                    name: 'Contestant edit',
                    component: contestantEditComponent,
                    path: '/contestant/:id?/edit',
                },
                {
                    name: 'View contestant',
                    component: ViewContestantComponent,
                    path: '',
                }
            ],
    ]
})

当我向输入添加内容时，出现错误:

found in

---> <EditContestant> at resources/js/components/Contestant/EditContestant.vue
       <Contestant> at resources/js/components/Contestant/Contestant.vue
         <Root>
warn @ app.js:41366
logError @ app.js:42625
globalHandleError @ app.js:42620
handleError @ app.js:42580
invokeWithErrorHandling @ app.js:42603
invoker @ app.js:42916
original._wrapper @ app.js:48273

和

app.js:42629 TypeError: Cannot read property '$parent' of null
    at _c.on.input (app.js:37434)
    at invokeWithErrorHandling (app.js:42595)
    at HTMLInputElement.invoker (app.js:42916)
    at HTMLInputElement.original._wrapper (app.js:48273)

Answer 1

模板中不需要 this.，只需使用 $parent 即可。模板已在 this. 范围内。

parent 和 child 之间的沟通应该使用Props down events up ，而不是直接通过 this.$parent.function() 调用函数。您应该先$emit('callFunc')，然后@callFunc="function"。