javascript - Create a two-way binding in vue.js between an array and multiple text inputs - Stack Overflow

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My data is stored in an array. For each array item, there should be a text input in the form. When the user types into one of the text inputs, the array should be updated with the new values.

  <div class="form-group" v-for="synonym in row.synonyms">
    <input type="text" class="form-control" v-model="synonym" />
  </div>

Here's a fiddle: /

The idea is when you type into one of the textboxes, the array value (shown below in that fiddle) should also update, but it doesn't.

My data is stored in an array. For each array item, there should be a text input in the form. When the user types into one of the text inputs, the array should be updated with the new values.

  <div class="form-group" v-for="synonym in row.synonyms">
    <input type="text" class="form-control" v-model="synonym" />
  </div>

Here's a fiddle: https://jsfiddle/eywraw8t/122210/

The idea is when you type into one of the textboxes, the array value (shown below in that fiddle) should also update, but it doesn't.

• javascript
• vue.js

Share Improve this question Follow asked Jun 29, 2018 at 4:07 user6269864user6269864

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3 Answers 3

Sorted by: Reset to default 4

Upon inspecting the console, you would find the following error:

You are binding v-model directly to a v-for iteration alias. This will not be able to modify the v-for source array because writing to the alias is like modifying a function local variable. Consider using an array of objects and use v-model on an object property instead.

Meaning, we need to give v-model access to a direct reference to the synonym and its index:

new Vue({
  el: "#app",
  data: {
    row: {
    	synonyms: [
      	"abc", 
        "def", 
        "ghj",
      ]
    }
  },
  methods: {

  }
})

body {
  font-family: 'Exo 2', sans-serif;
}

#app {
  margin: auto;
}

<div id="app">
  <h2>Items</h2>
  <div class="form-group" v-for="(synonym,i) in row.synonyms">
    <input type="text" class="form-control" v-model="row.synonyms[i]" />
  </div>
  
  <br>
  
  <h3>
  The text below should change if yout type inside the textboxes:
  </h3>
  
  <p>
  {{ JSON.stringify(row)}}
  </p>
</div>
<script src="https://cdn.jsdelivr/npm/[email protected]/dist/vue.js"></script>

The correct way to do it is to use an index, which vue.js provides in loops:

  <div class="form-group" v-for="(synonym, index) in row.synonyms">
    <input type="text" class="form-control" v-model="row.synonyms[index]" />
  </div>

https://jsfiddle/m14vd89u/1/

This is the remended way that Vue.js wants you to do it by using an index (synonym, index):

https://v2.vuejs/v2/guide/list.html

<div class="form-group" v-for="(synonym, index) in row.synonyms">
  <input type="text" class="form-control" v-on:blur="onItemsChanged(synonym)" v-model="row.synonyms[index]" />
</div>

If you wanted to do it another way you could introduce a method v-on:blur:

new Vue({
  el: "#app",
  data: {
    row: {
        synonyms: [
        "abc", 
        "def", 
        "ghj",
      ]
    }
  },
  methods: {
    onItemsChanged (synonym) {
      // do something with array
    }
  }
})

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