Vue 3: wrap all items within a slot with a custom component by using a render function

I am trying to build my own sortable component. I want to pass a list of items to it’s default slot. The sortable component should then wrap all passed items with a custom v-draggable component.

<v-sortable handle=".handle">
    <template :key="index" v-for="(item, index) in items">
        <some-complex-component :item="item"></some-complex-component>
    </template>
</v-sortable>

Now withn my v-sortable component I am trying to wrap all given nodes within default slot with a custom v-draggable component. My v-sortable component looks like this:

import { h } from 'vue';

export default {
    name: 'v-sortable',
    props: {
        handle: {
            type: String,
            required: false,
            default: () => {
                return null;
            }
        },
    },
    render () {
        const draggableItems = this.$slots.default().map(slotItem =>
            h('v-draggable', { handle: this.handle }, [slotItem])
        )
        return draggableItems;
    }
}

This works as expected, except that my custom component v-draggable will not be rendered as a vue component. All items will be wrapped in html tags called <v-draggable>. How would I have to proceed to actually parse the v-draggable component as Vue component?

Answer

Try to import it and register and use it directly :

import { h } from 'vue';
import VDraggable from 'path/to/v-draggable'
export default {
    name: 'v-sortable',
    props: {
        handle: {
            type: String,
            required: false,
            default: () => {
                return null;
            }
        },
    },
    render () {
        const draggableItems = this.$slots.default().map(slotItem =>
            h(VDraggable, { handle: this.handle }, [slotItem])
        )
        return draggableItems;
    }
}

It’s recommended to pass items as prop and use them directly inside the render function :

<v-sortable handle=".handle" :items="items">
</v-sortable>

child component :

import { h } from 'vue';
import VDraggable from 'path/to/v-draggable'
export default {
    name: 'v-sortable',
    props: {
        items:{
         type:Array,
         default: () =>[]
        },
        handle: {
            type: String,
            required: false,
            default: () => {
                return null;
            }
        },
    },
    render () {
        const draggableItems = this.items.map(slotItem =>
            h(VDraggable, { handle: this.handle }, [item])
        )
        return draggableItems;
    }
}