I don't need to pass data between a parent component to a child one or the opposite, I need something like php/c static variables.
I want my sfc (single file component) to have some data that is shared among all instances in in the page.
As far as I understand that's why in sfc we define data as a function
export default {
data(){
return {
// props here
};
}
}
while in page scripts we can define it as an object
const app = new Vue({
data: {
// props here
},
}
That's because since we can have multiple instances of a sfc in the page defining its data as a function make each instance to execute in and get its own data, while with page script we can have a singe instance.
I need to define some of my sfc data to be shared between component instances, while other data to be per-instance.
Is there a way to do this?
That depends on the data to be defined, its complexity, and purpose.
If these are 2 or 3 readonly variables, they can be set as global properties using Vue.prototype (Vue 2) or app.config.globalProperties (Vue 3). I'm not sure, because in your example you use Vue 2 syntax.
If the data should be reactive, you can set up a simple state management as explained in the Vue documentation: Simple state management.
If the data is more complex than that, the next step will be Vuex.
Following @Igor answer I looked after the simple state management and found the ref() method that creates reactive primitive values.
In my specific use case I needed to share among all the sfc instances just an array, so in my sfc I had:
const reactive_array = ref([]);
export default {
data() {
return {
shared_array: reactive_array,
};
},
};