Issue with Vue 3 Template refs not retrieving expected values

I have been using Vue 3 template refs in a Nuxt project with the composition API, and so far, they have worked well for other components. However, I am facing an issue where the refs are returning null in this particular case.

Below is the template code:

<template>
        <div class="horizontal-scroll-fix" ref="container">
            <div class="horizontal-scroll-fix__scroll-fix">
                <container class="horizontal-scroll-fix__container">
                    <div class="horizontal-scroll-fix__viewport" ref="viewport">
                        <div class="horizontal-scroll-fix__wrapper" ref="wrapper">
                            <slot></slot>
                        </div>
                    </div>
                </container>
            </div>
        </div>
    </template>


    <script>

        import { ref, computed, onMounted, onBeforeUnmount, useSlots } from 'vue';

        export default {
            setup() {
                const container = ref(null);
                const wrapper = ref(null);
                const viewport = ref(null);


                onMounted(() => {
                    if (process.client) {
                        console.log(container?.value) // returns undefined
                    }
                });

            }
                
        }

    </script>

When console.logging the ref object, it shows the following:

RefImpl {__v_isShallow: false, dep: undefined, __v_isRef: true, _rawValue: undefined, _value: undefined}

UPDATE

I have been informed that I need to return the refs at the end of the setup script using

return { container, wrapper, viewport }
. However, what puzzles me is that all other components in my project work fine without needing to do this. What could be different about this one that I am not noticing? Here is an example of another component with template refs that works perfectly without returning the values:

<template>
        <container>
            <div :class="'sequence sequence--'+section.displayAs">
                <div class="sequence__content" ref="content">
                    // inner content removed for demonstration purpose
                </div>
            </div>
        </container>
    </template>

    <script setup> 
        import { ref, computed, onMounted, onUnmounted } from 'vue';
        const props = defineProps({
            section: {
                required:true,
                type:Object
            }
        });

        const isDesktop = ref(false);
        const currentSectionIndex = ref(0);
        const fixedVisual = ref(null);
        const content = ref(null);

        function initMediaQuery() {
            const mediaQuery = window.matchMedia('(min-width:1024px)');
            checkDeviceSize(mediaQuery);
            mediaQuery.addListener(checkDeviceSize);
            
        };
        
        // More code goes here...

    </script>

Answer №1

Make sure to retrieve the 3 variables from the conclusion of the setup() function :

setup() {
    ...
    return {
        container,
        wrapper,
        viewport
    }
}

Answer №2

When a component's lifespan begins, the setup() method is called as soon as the renderer encounters it. This means that all elements used in the body of the <template> must be known by the time setup() completes.

If you want to use ref values in your <template>, make sure to include them in the return statement of your setup() function:

setup() {
    const container = ref(null);
    const wrapper = ref(null);
    const viewport = ref(null);

    // Any necessary callbacks like onMounted, onBeforeCreate, etc.
    
    return { container, wrapper, viewport };
}

Answer №3

Responding to @ToddPadwick's question about why other components function properly without returning the refs:

Nuxt 3 documentation clarifies this through auto-importation: https://nuxt.com/docs/guide/concepts/auto-imports#vue-auto-imports

Vue 3 provides Reactivity APIs like ref or computed, along with lifecycle hooks and helpers that are automatically imported by Nuxt.

Therefore, there is no need for you to manually write

return { container, wrapper, viewport }
at the end of your script. Nuxt 3 will handle it for you unless you have disabled this feature as shown here:

https://nuxt.com/docs/guide/concepts/auto-imports#disabling-auto-imports

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