What is the most effective method for transferring and accessing data within a child form component?

Question

What is the most effective method for transferring and accessing data within a child form component?

This is how I am currently handling it:

Parent.vue:

// Template

<form-child :schema="schema"><form-child>

// JS

data () {
  return {
    schema: [{ // name: '', value: '', type: '' }, { //etc ... }]
  }
}

FormChild.vue:

// Template

<div v-for="field in schema">
  <input v-if="field.type === 'text'" @change="updateValue(field.name, field.value)">
  <textarea v-if="field.type === 'textarea'" @change="updateValue(field.name, field.value)">/textarea>
</div>

// JS

props: {
  schema: Arrary
}

methods: {
  updateValue (fieldName, fieldValue) {
    this.schema.forEach(field => {
      // this will update the schema in Parent.vue
      if (field.name === fieldName) field.value = fieldValue
    })
  }
}

Do you think there might be a more effective way to handle this, maybe using emit and v-model? If so, could you please show me an example of how to implement that?

javascript vue.js vuejs2

Answer 1

Answer №1

When creating a child component, it is important to ensure that it is decoupled from the parent data structure. The child component should have separate props for `type` and `value`, along with an opaque `id` to communicate which value is being emitted.

To enable the use of `v-model` on form elements within the component, a settable computed property based on the `value` parameter can be utilized. The `set` function triggers an `input` event containing the `id` and the new value, allowing the parent to handle the update.

Update: Upon further consideration, I decided to manage the `id` in the input handler:

@input="updateField(index, $event)

.

new Vue({
  el: '#app',
  data: {
    schema: [{
        type: 'text',
        name: 'one',
        value: "1"
      },
      {
        type: 'textarea',
        name: 'two',
        value: "stuff in the textarea"
      }
    ]
  },
  methods: {
    updateField(index, newValue) {
      this.schema[index].value = newValue;
    }
  },
  components: {
    formInput: {
      props: ['type', 'value'],
      computed: {
        proxyValue: {
          get() { return this.value; },
          set(newValue) {
            this.$emit('input', newValue);
          }
        }
      }
    }
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.3/vue.min.js"></script>
<div id="app">
  <div v-for="field in schema">
    {{field.name}} = {{field.value}}
  </div>
  <form-input inline-template v-for="field, index in schema" :type="field.type" :key="index" :value="field.value" @input="updateField(index, $event)">
    <div>
      <input v-if="type === 'text'" v-model="proxyValue">
      <textarea v-if="type === 'textarea'" v-model="proxyValue"></textarea>
    </div>
  </form-input>
</div>

Answer 2

When creating a child component, it is important to ensure that it is decoupled from the parent data structure. The child component should have separate props for `type` and `value`, along with an opaque `id` to communicate which value is being emitted.

To enable the use of `v-model` on form elements within the component, a settable computed property based on the `value` parameter can be utilized. The `set` function triggers an `input` event containing the `id` and the new value, allowing the parent to handle the update.

Update: Upon further consideration, I decided to manage the `id` in the input handler:

@input="updateField(index, $event)

.

new Vue({
  el: '#app',
  data: {
    schema: [{
        type: 'text',
        name: 'one',
        value: "1"
      },
      {
        type: 'textarea',
        name: 'two',
        value: "stuff in the textarea"
      }
    ]
  },
  methods: {
    updateField(index, newValue) {
      this.schema[index].value = newValue;
    }
  },
  components: {
    formInput: {
      props: ['type', 'value'],
      computed: {
        proxyValue: {
          get() { return this.value; },
          set(newValue) {
            this.$emit('input', newValue);
          }
        }
      }
    }
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.3/vue.min.js"></script>
<div id="app">
  <div v-for="field in schema">
    {{field.name}} = {{field.value}}
  </div>
  <form-input inline-template v-for="field, index in schema" :type="field.type" :key="index" :value="field.value" @input="updateField(index, $event)">
    <div>
      <input v-if="type === 'text'" v-model="proxyValue">
      <textarea v-if="type === 'textarea'" v-model="proxyValue"></textarea>
    </div>
  </form-input>
</div>

Answer 3

Answer №2

Instead of breaking the form into a separate component, you can simply integrate it into the parent element and utilize v-model.

new Vue({
  el: '#app',
  data: {
    schema: [{
        type: 'text',
        name: 'one',
        value: "1"
      },
      {
        type: 'textarea',
        name: 'two',
        value: "stuff in the textarea"
      }
    ]
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.3/vue.min.js"></script>
<div id="app">
  <div v-for="field in schema">
    {{field.name}} = {{field.value}}
  </div>
  <div v-for="field in schema">
    <input v-if="field.type === 'text'" v-model="field.value">
    <textarea v-if="field.type === 'textarea'" v-model="field.value"></textarea>
  </div>
</div>

If you prefer to create a component for reusability and are not concerned about isolating the parent from changes (although best practice is to avoid external changes to component data), you can enclose the same code within a component:

new Vue({
  el: '#app',
  data: {
    schema: [{
        type: 'text',
        name: 'one',
        value: "1"
      },
      {
        type: 'textarea',
        name: 'two',
        value: "stuff in the textarea"
      }
    ]
  },
  components: {
    formChild: {
      props: ['value']
    }
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.3/vue.min.js"></script>
<div id="app">
  <div v-for="field in schema">
    {{field.name}} = {{field.value}}
  </div>
  <form-child inline-template v-model="schema">
    <div>
      <div v-for="field in value">
        <input v-if="field.type === 'text'" v-model="field.value">
        <textarea v-if="field.type === 'textarea'" v-model="field.value"></textarea>
      </div>
    </div>
  </form-child>
</div>

Answer 4

Instead of breaking the form into a separate component, you can simply integrate it into the parent element and utilize v-model.

new Vue({
  el: '#app',
  data: {
    schema: [{
        type: 'text',
        name: 'one',
        value: "1"
      },
      {
        type: 'textarea',
        name: 'two',
        value: "stuff in the textarea"
      }
    ]
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.3/vue.min.js"></script>
<div id="app">
  <div v-for="field in schema">
    {{field.name}} = {{field.value}}
  </div>
  <div v-for="field in schema">
    <input v-if="field.type === 'text'" v-model="field.value">
    <textarea v-if="field.type === 'textarea'" v-model="field.value"></textarea>
  </div>
</div>

If you prefer to create a component for reusability and are not concerned about isolating the parent from changes (although best practice is to avoid external changes to component data), you can enclose the same code within a component:

new Vue({
  el: '#app',
  data: {
    schema: [{
        type: 'text',
        name: 'one',
        value: "1"
      },
      {
        type: 'textarea',
        name: 'two',
        value: "stuff in the textarea"
      }
    ]
  },
  components: {
    formChild: {
      props: ['value']
    }
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.3/vue.min.js"></script>
<div id="app">
  <div v-for="field in schema">
    {{field.name}} = {{field.value}}
  </div>
  <form-child inline-template v-model="schema">
    <div>
      <div v-for="field in value">
        <input v-if="field.type === 'text'" v-model="field.value">
        <textarea v-if="field.type === 'textarea'" v-model="field.value"></textarea>
      </div>
    </div>
  </form-child>
</div>

What is the most effective method for transferring and accessing data within a child form component?

Answer №1

Answer №2

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