孩子和父母之间共享的 v-model 值

Question

I have a component which shares v-model same as parent component. The code is like below:

 Vue.component('greeting', { template: '<input type="text" :name="name" v-on:input="updateSearch($event.target.value)"> ' , props: ['name'], methods: { updateSearch: function(value) { this.$emit('input', value); } } }); const app = new Vue({ el: '#app', data: { name: '' } });

 <script src="https://unpkg.com/vue@2.6.9/dist/vue.js"></script> <div id="app"> Child: <greeting v-model="name"></greeting> <br><br><br> Main: <input type="text" v-model="name" placeholder="" /> </div>

I want to update both input boxes if the user enters text in either of them. Any suggestions would be helpful.

Answer 1

Usually is a bad practice change props inside child component. In this case, you can create two different variables and update the other one when some of them changes it value (via events and props).

So, greeting component would $emit some event which you will catch inside main component and update main's name

On the other hand, main component would pass a prop to greeting which will be reactive considering changes inside main and will update variable name inside greeting's data.

If you get more cases like that, think about using vuex

Answer 2

If you pass in a reference like an object as prop, you can bind a property of that object on both your parent and child

 Vue.component('greeting', { template: '<input type="text" v-model="name.value" />' , props: ['name'] }); const app = new Vue({ el: '#app', data: { name: { value: '' } } });

 <script src="https://unpkg.com/vue@2.6.9/dist/vue.js"></script> <div id="app"> Child: <greeting v-bind:name="name"></greeting> <br><br><br> Main: <input type="text" v-model="name.value" placeholder="" /> </div>

Answer 3

I think, what you are looking for is .sync modifier for events in Vue.js 2.3.0+ .

You can find a sample implementation of the same in my article here .