The proper method for transmitting information to a custom input component embedded within another component

Question

The proper method for transmitting information to a custom input component embedded within another component

I have recently made the switch from React to Vue and I am really impressed by the v-model feature that Vue offers. However, I am now facing a dilemma and struggling to figure out the best way to handle this situation in a more Vue-appropriate manner.

This is the structure of my component tree:

- FormContainer
  -FormView
    - CustomInput
      - input

My state is residing in FormContainer, let's say we have properties like name and age. I want to find a solution without resorting to custom setter methods, similar to how I would use v-model. How can I efficiently pass the data down to the input component?

Currently, I have implemented it as follows:

// within my container
<form-view :name="name" :age="age" />

// within my form view, I have something like
<custom-input v-model="age"/>
<input v-model="name" />

Unfortunately, both approaches are not working as expected, resulting in an error stating Avoid mutating a prop directly.

I wish to achieve something like:

<form-view @age="age" :age="age" @name="name" :name="name"/>

or a similar approach. Please advise if you need further clarification on this matter.

javascript vue.js vuejs2

Answer 1

Answer №1

After providing answers to this question twice, I felt they were not quite suitable for your needs and decided to remove them.

In essence, you are looking for events to propagate from the elements where they occur to the Vue instance that holds the data. While Vue events do not naturally bubble up, native events do. By leveraging native event binding such as @input.native, you can capture a native event like input at any component higher in the hierarchy.

For the scenario described, if the name and age data reside in the top-level Vue instance, the outermost component can accept them as props using the .sync modifier. This means that any update:name or update:age events triggered by the component will update these data items successfully.

Within the form-view component, there is an ordinary input element generating native input events. To ensure these events cascade upwards as update:name events, we handle it as follows:

<input :value="name" @input="$emit('update:name', $event.target.value)">

The intriguing part comes when dealing with the nested custom-input component within the form-view component. Here, a native input event is produced somewhere within its structure. Instead of catching and bubbling it up at each level, simply let it arise naturally and capture it at the root of the custom-input component, emitting the necessary update:age event:

<custom-input :value="age" @input.native="$emit('update:age', $event.target.value)">

Combining all these steps, we pass two variables through various components to input elements, utilize two input event handlers, and avoid using computed properties altogether.

new Vue({
  el: '#app',
  data: {
    name: 'Jerry',
    age: 21
  },
  components: {
    formView: {
      props: ['age', 'name'],
      components: {
        customInput: {
          props: ['value']
        }
      }
    }
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.min.js"></script>
<div id="app">
  <div>Name: {{name}}</div>
  <div>Age: {{age}}</div>
  <form-view :name.sync="name" :age.sync="age" inline-template>
    <div>
      <custom-input :value="age" @input.native="$emit('update:age', $event.target.value)" inline-template>
        <div>
          Age: <input :value="value">
        </div>
      </custom-input>
      <div>Name: <input :value="name" @input="$emit('update:name', $event.target.value)"></div>
    </div>
  </form-view>
</div>

Answer 2

After providing answers to this question twice, I felt they were not quite suitable for your needs and decided to remove them.

In essence, you are looking for events to propagate from the elements where they occur to the Vue instance that holds the data. While Vue events do not naturally bubble up, native events do. By leveraging native event binding such as @input.native, you can capture a native event like input at any component higher in the hierarchy.

For the scenario described, if the name and age data reside in the top-level Vue instance, the outermost component can accept them as props using the .sync modifier. This means that any update:name or update:age events triggered by the component will update these data items successfully.

Within the form-view component, there is an ordinary input element generating native input events. To ensure these events cascade upwards as update:name events, we handle it as follows:

<input :value="name" @input="$emit('update:name', $event.target.value)">

The intriguing part comes when dealing with the nested custom-input component within the form-view component. Here, a native input event is produced somewhere within its structure. Instead of catching and bubbling it up at each level, simply let it arise naturally and capture it at the root of the custom-input component, emitting the necessary update:age event:

<custom-input :value="age" @input.native="$emit('update:age', $event.target.value)">

Combining all these steps, we pass two variables through various components to input elements, utilize two input event handlers, and avoid using computed properties altogether.

new Vue({
  el: '#app',
  data: {
    name: 'Jerry',
    age: 21
  },
  components: {
    formView: {
      props: ['age', 'name'],
      components: {
        customInput: {
          props: ['value']
        }
      }
    }
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.min.js"></script>
<div id="app">
  <div>Name: {{name}}</div>
  <div>Age: {{age}}</div>
  <form-view :name.sync="name" :age.sync="age" inline-template>
    <div>
      <custom-input :value="age" @input.native="$emit('update:age', $event.target.value)" inline-template>
        <div>
          Age: <input :value="value">
        </div>
      </custom-input>
      <div>Name: <input :value="name" @input="$emit('update:name', $event.target.value)"></div>
    </div>
  </form-view>
</div>

The proper method for transmitting information to a custom input component embedded within another component

Answer №1

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