I am interested in utilizing Vue Fallthrough attributes, but I specifically want them to be applied only to the input elements within the component and not on the container itself

I am facing an issue with my checkbox component. I want to utilize Fallthrough attributes to pass non-declared attributes to the input inside the checkbox component. However, when I add HTML attributes to the Vue component, those attributes are applied not only to the input within the container but also to the container element of the checkbox component.

Here is the HTML code for my component:

    <template>
      <div class="form-checkbox">
        <v-label
          v-if="legend"
          :suffix="legendSuffix"
          :for="$attrs.id || uid"
          :helper="helperText"
        >
          {{ legend }}
        </v-label>
    
        <div class="form-input__wrapper">
          <input
            :id="$attrs.id || uid"
            ref="checkboxRef"
            type="checkbox"
            v-bind="$attrs"
            v-model="inputVal"
            @input="onInput"
          />
    
          <label :for="$attrs.id || uid">{{ label }}</label>
        </div>
    
      </div>
    </template>
    
    <script lang="ts" src="./Checkbox.ts" />

And here is the TypeScript code for my component:

export default defineComponent({
  props: {
    legend: {
      type: String,
      default: ''
    },
    legendSuffix: {
      type: String,
      default: ''
    },
    helperText: { type: String, default: '' },
    label: { type: String, default: '' },
    modelValue: {
      type: [String, Number],
      default: ''
    }
  },

  emits: ['error', 'input-event', 'mounted'],

  setup(props, { emit }) {
    const checkboxRef = ref();
    const inputVal = ref();
    const uid = ref(uniqueId());

    watch(
      () => props.modelValue,
      () => {
        inputVal.value = String(props.modelValue);
      },
      { immediate: true }
    );

    const onInput = (event: CustomEvent): void => {
      emit('input-event', event);
    };

    onMounted(() => emit('mounted', unref(checkboxRef)));

    return {
      checkboxRef,
      inputVal,
      uid,
      onInput
    };
  }
});

When I include the component like this, the ID property gets added to both the container and the checkbox input:

    <v-checkbox
      id="test"
      :label="test"
    />

I am looking for a solution to prevent these attributes from being duplicated on the container and the input, as having the ID used twice is causing issues.

Answer №1

To prevent attribute inheritance, consult the documentation for guidance

https://vuejs.org/guide/components/attrs.html#disabling-attribute-inheritance

Disabling Attribute Inheritance {#disabling-attribute-inheritance}

If you do not wish for a component to automatically inherit attributes, you can specify inheritAttrs: false in the component's options.

Starting from version 3.3, you also have the option to utilize defineOptions directly inside <script setup>:

<script setup>
defineOptions({
  inheritAttrs: false
})
// ...setup logic
</script>

A common use case for disabling attribute inheritance is when attributes need to be applied to elements other than the root node. By setting the inheritAttrs option to false, you gain full control over where the inherited attributes should be assigned.

You can access these inherited attributes directly in template expressions using $attrs:

<span>Inherited Attributes: {{ $attrs }}</span>

The $attrs object contains all attributes that are not defined in the component's props or emits options (e.g., class, style, v-on listeners, etc.).

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