Vue - Passing a parent's ref to a child component as a prop

Question

Vue - Passing a parent's ref to a child component as a prop

Is there a way to pass the current component's reference to a child component in Vue.js?

<template>
    <div class="screen" ref="screen">
        <child-component :screenRef="screenRef">
        </child-component>
    </div>
</template>


<script>
    const Parent = {
        name: 'parent',
        data: {
            screenRef: {}
        },
        mounted() {
            this.screenRef = this.$refs['screen']
        }
    }
</script>

I'm encountering an issue when trying to define screenRef as a prop in the child component, as Vue.js types do not support HTMLDivElement.

const ChildComponent = {
  name: 'child',
  props: {
    screen: {
      type: HTMLDivElement,
      default: {}
    }
  }
}

If you have any suggestions or solutions on how to correctly achieve this, please share!

javascript vue.js vuejs2

Answer 1

Answer №1

Simply access the parent from a child component by:

this.$parent

or

this.$el.parent

Alternatively, you can use the inheritAttrs option in the child component to pass attributes from the parent to the child transparently:

const ChildComponent = {
  inheritAttrs: true,
  name: 'child',
  props: {
    screen: {
      type: HTMLDivElement,
      default: {}
    }
  }
}

Answer 2

Simply access the parent from a child component by:

this.$parent

or

this.$el.parent

Alternatively, you can use the inheritAttrs option in the child component to pass attributes from the parent to the child transparently:

const ChildComponent = {
  inheritAttrs: true,
  name: 'child',
  props: {
    screen: {
      type: HTMLDivElement,
      default: {}
    }
  }
}

Answer 3

Answer №2

All tasks have been executed correctly. The only thing missing is declaring the required type for the screen prop in the child component. Simply adding props: {screen: {default: {}}} will resolve this issue.

Some additional points to consider:

The best location to assign $refs elements to $data items is within the mounted hook, as the former is not defined during the created hook.
In Vue, there is a type: Object option that can be used for proper type validation of your screen prop if you wish to enforce props type validation.
If you ever need to assign a default object value other than an empty {}, you must do so through a function (unlike non-object data types):
```
default: function () {
    return {a: 1, b: 2}
}
```

Answer 4

All tasks have been executed correctly. The only thing missing is declaring the required type for the screen prop in the child component. Simply adding props: {screen: {default: {}}} will resolve this issue.

Some additional points to consider:

The best location to assign $refs elements to $data items is within the mounted hook, as the former is not defined during the created hook.
In Vue, there is a type: Object option that can be used for proper type validation of your screen prop if you wish to enforce props type validation.
If you ever need to assign a default object value other than an empty {}, you must do so through a function (unlike non-object data types):
```
default: function () {
    return {a: 1, b: 2}
}
```

Answer 5

Answer №3

To access information from another component, simply pass it through as props.

If you find yourself requiring the same data in various components, consider using Vuex:

https://vuex.vuejs.org/guide/

Answer 6

To access information from another component, simply pass it through as props.

If you find yourself requiring the same data in various components, consider using Vuex:

https://vuex.vuejs.org/guide/

Answer 7

Answer №4

If you encounter a common problem like setting up an IntersectionObserver inside a child component while implementing infinite scroll, one solution is to pass the parent container's ref to the child component.

Another approach is to create a getScreenRef function that retrieves the ref and call it within the child component's mounted method:

<template>
    <div class="screen" ref="screen">
        <child-component :getScreenRef="() => $refs['screen']">
        </child-component>
    </div>
</template>


<script>
    const Parent = {
        name: 'parent',
    }
</script>


const ChildComponent = {
  name: 'child',
  props: {
    getScreenRef: {
      type: Function,
      default: () => ({})
    }
  },
  mounted() {
    // Access the screen ref within the mounted method
    const screenRef = this.getScreenRef();
    ...
  }
}

Answer 8

If you encounter a common problem like setting up an IntersectionObserver inside a child component while implementing infinite scroll, one solution is to pass the parent container's ref to the child component.

Another approach is to create a getScreenRef function that retrieves the ref and call it within the child component's mounted method:

<template>
    <div class="screen" ref="screen">
        <child-component :getScreenRef="() => $refs['screen']">
        </child-component>
    </div>
</template>


<script>
    const Parent = {
        name: 'parent',
    }
</script>


const ChildComponent = {
  name: 'child',
  props: {
    getScreenRef: {
      type: Function,
      default: () => ({})
    }
  },
  mounted() {
    // Access the screen ref within the mounted method
    const screenRef = this.getScreenRef();
    ...
  }
}

Answer 9

Answer №5

Consider setting the default value to null and removing the type attribute. I encountered a situation where I needed to pass a reference from a sibling component.

const ChildComponent = {
  name: 'child',
  props: {
    screen: {
      default: null
    }
  }
}

Answer 10

Consider setting the default value to null and removing the type attribute. I encountered a situation where I needed to pass a reference from a sibling component.

const ChildComponent = {
  name: 'child',
  props: {
    screen: {
      default: null
    }
  }
}

Vue - Passing a parent's ref to a child component as a prop

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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