After entering just one character, the focus on the input field in Vue.js is lost

Question

After entering just one character, the focus on the input field in Vue.js is lost

Currently, I am facing an issue with a view that contains an input field. When a character is entered, the input field loses focus, requiring an additional click to resume typing. Does anybody have any insight into what might be causing this problem?

Here is my model:

'model': [
    ...,
    'filter': [
        ...,
        'something': [
            'string'
        ]
    ]
]

Here is my code:

<div v-for="(something, index) in model.filter.something" v-bind:key="something">
    <input type="text" v-model.trim="model.filter.something[index]"/>
</div>

javascript focus vue.js

Answer 1

Answer №1

The issue lies in the fact that you are using a variable value as the key. Vue requires the key to be a unique identifier for the item. Once you change it, Vue treats it as a new item and triggers re-rendering.

In the code snippet provided below, there are two loops that use the same data source. The first loop uses the changing value as the key, while the second loop uses the index instead. The purpose of this demonstration is to showcase using a different identifier than what is being modified. In this scenario, the key is unnecessary. The first loop demonstrates the issue you mentioned with the loss of focus, whereas the second loop functions correctly.

new Vue({
  el: '#app',
  data: {
    'model': {
      'filter': {
        'something': [
          'string'
        ]
      }
    }
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.2.6/vue.min.js"></script>
<div id="app">
  <div v-for="(something, index) in model.filter.something" v-bind:key="something">
    <input type="text" v-model.trim="model.filter.something[index]" />
    {{something}}
  </div>
  <div v-for="(something, index) in model.filter.something">
    <input type="text" v-model.trim="model.filter.something[index]" :key="index" />
    {{something}}
  </div>
</div>

Answer 2

The issue lies in the fact that you are using a variable value as the key. Vue requires the key to be a unique identifier for the item. Once you change it, Vue treats it as a new item and triggers re-rendering.

In the code snippet provided below, there are two loops that use the same data source. The first loop uses the changing value as the key, while the second loop uses the index instead. The purpose of this demonstration is to showcase using a different identifier than what is being modified. In this scenario, the key is unnecessary. The first loop demonstrates the issue you mentioned with the loss of focus, whereas the second loop functions correctly.

new Vue({
  el: '#app',
  data: {
    'model': {
      'filter': {
        'something': [
          'string'
        ]
      }
    }
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.2.6/vue.min.js"></script>
<div id="app">
  <div v-for="(something, index) in model.filter.something" v-bind:key="something">
    <input type="text" v-model.trim="model.filter.something[index]" />
    {{something}}
  </div>
  <div v-for="(something, index) in model.filter.something">
    <input type="text" v-model.trim="model.filter.something[index]" :key="index" />
    {{something}}
  </div>
</div>

After entering just one character, the focus on the input field in Vue.js is lost

Answer №1

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