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Vue custom filtering input component

Asked By: Anonymous

I’am trying to create a component that have ‘just’ an text input. String typed in this input will be used to filter a list. My problem is that I cannot handle how to share this filter string between my component and the main app that contains the list to filter.

I tried several things and most of the time I get the error :
Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value

So I looked Vuex but I thinks it cannot help in this case because I can have several filter component used in he same page for different list, and I don’t want them to be synchronized ^^

Here is what I have:

The filter component

<script type="x/template" id="filterTpl">
        <span class="filter-wrapper">
            <input type="search" class="input input-filter" v-model.trim="filter" />

    Vue.component('list-filter', {
        props: {
            filter: String
        template: '#filterTpl'

And my main app:

<div id="contacts">
        <list-filter :filter="filter"></list-filter>
        <ul class="contacts-list managed-list flex">
            <li class="contact" v-for="contactGroup in filteredData">

    var contactsV = new Vue({
        el: '#contacts',
        data: {
            filter: "",
            studyContactsGroups: []
        computed: {
            filteredData: function(){
                // Using this.filter to filter the studyContactsGroups data
                return filteredContacts;

Thanks for any help or tips 🙂


Answered By: Anonymous

You can synchronize child value and parent prop either via explicit prop-event connection or more concise v-bind with sync modifier:



new Vue({_x000D_
  el: '#app',_x000D_
  data: {_x000D_
    rawData: ['John', 'Jane', 'Jim', 'Eddy', 'Maggy', 'Trump', 'Che'],_x000D_
    filter: ''_x000D_
  components: {_x000D_
    'my-input' : {_x000D_
      // bind prop 'query' to value and_x000D_
      // @input update parent prop 'filter' via event used with '.sync'_x000D_
      template: `<input :value="query" @input="updateFilter">`,_x000D_
      props: ['query'],_x000D_
      methods: {_x000D_
        updateFilter: function(e) {_x000D_
          this.$emit('update:query', // this is described in documentation_x000D_
  computed: {_x000D_
    filteredData: function() {_x000D_
      // simple filter function_x000D_
      return this.rawData.filter(el => el.toLowerCase()_x000D_


<a href=""></a>_x000D_
<div id="app">_x000D_
  <my-input :query.sync="filter"></my-input>_x000D_
    <li v-for="line in filteredData">{{ line }}</li>_x000D_




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