How does the 'snack bar message' get automatically assigned without being explicitly defined in the 'data' function?

As a novice in web development and Vue, I am currently engaged in a simple project using Vuetify with Vue.JS 3. Within one of my views, there is a table that triggers a message and fetches status to display a snackbar to the user:

methods: {
    async fetchVehicles() {
      await api
        .get(vehiclesForTable.getAll)
        .then((response) => {
          this.vehicles = response.data.data;
          this.snackBarMessage = response.data.message;
          this.isSuccess = response.data.success;
        })
        .catch(() => {
          this.snackBarMessage = "An unknown error occurred.";
          this.isSuccess = false;
        })
        .finally(() => {
          this.$emit("open-snackbar", this.isSuccess, this.snackBarMessage);
        });
    },
    openDetailsDialog(id) {
      this.$emit("toggle-detail", id);
    },
    openEditDialog(id) {
      this.$emit("toggle-edit", id);
    },
    openAddDialog(id) {
      this.$emit("toggle-add", id);
    },
    openDeleteDialog(id) {
      this.$emit("toggle-delete", id);
    },
},  

It's worth noting that I'm utilizing axios to fetch my data.

However, an interesting observation is that there are no "isSuccess" or "snackBarMessage" variables declared within my Data function below:

data() {
  return {
    vehicles: [],
    headers: [...],
    searchText: "",
  };
},

So how does my code function correctly? Perhaps they could be considered as local variables even though I access them using "this."

I appreciate any insight you can offer.

This isn't an issue per se, but it has left me feeling puzzled. It appears to be more about gaining knowledge than resolving a problem.

Answer №1

Utilizing Vue with the Options API approach, you must ensure that properties like isSuccess and snackBarMessage are defined in the component's data to avoid reactivity issues.

Curious about how the code functions?

If these properties are not present in the data section, they will simply be undefined without breaking the code. However, attempting to call a non-existent function would result in a TypeError.

Here's an illustration: when values are assigned to isSuccess or snackBarMessage within then and catch, they will not be undefined in the finally block, ensuring that the snackbar always displays something. Nonetheless, adding these properties to the data object is essential for proper tracking by Vue.

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