What is the best way to share information among Vue3 single file component instances?

I am seeking a way to have certain data in my single file component shared among all instances on the page, similar to how static variables work in PHP/C.

To achieve this, I understand that in single file components, we declare data as a function like so:

export default {
    data(){
        return {
            // props here
        };
    }
}

On the other hand, in page scripts, we can define data as an object:

const app = new Vue({
    data: {
        // props here
    },
}

The reason for this distinction is that by defining data as a function in single file components, each instance will have its own data. In contrast, when using page script, there is typically only one instance present.

I am looking for a solution to define some of my single file component data to be shared between instances while keeping other data specific to each individual instance. Is there a method to accomplish this?

Answer №1

The determination for how to define the data will vary based on its nature, level of intricacy, and intended use.

In the scenario where there are only 2 or 3 read-only variables, a viable option would be to establish them as global properties through Vue.prototype (for Vue 2) or app.config.globalProperties (for Vue 3). It's worth noting that there may be ambiguity in your case since you are utilizing Vue 2 syntax.

If the data necessitates reactivity, it can be accomplished by implementing a straightforward state management system elaborated in the Vue documentation: Simple state management.

In situations where the data surpasses this level of complexity, the logical progression would involve exploring Vuex.

Answer №2

After reading @Igor's response, I delved into the world of simple state management and stumbled upon the ref() method for creating reactive primitive values.

In my unique situation, I needed to share a single array across all instances of my sfc. This led me to implement the following in my code:

const reactive_array = ref([]);

export default {
    data() {
        return {
            shared_array: reactive_array,
        };
    },
};

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