Recommended way of handling unsaved changes

Handling unsaved changes is a common challenge in web applications, and there are several ways to approach it. Here's a recommended solution using Vue with Inertia.js:

1. Track the form's state to detect changes.
2. Intercept navigation events to check for unsaved changes.
3. Prompt the user to save changes or discard them.
4. Cancel navigation if necessary.

Here's a step-by-step guide with code examples:

Step 1: Track Form State

Use a data property to track the form's initial state and compare it with the current state.

export default {
  data() {
    return {
      form: this.$inertia.form({
        // Your form fields here
      }),
      initialFormState: {},
    };
  },
  created() {
    this.setInitialFormState();
  },
  methods: {
    setInitialFormState() {
      this.initialFormState = JSON.parse(JSON.stringify(this.form));
    },
    hasUnsavedChanges() {
      return JSON.stringify(this.form) !== JSON.stringify(this.initialFormState);
    },
  },
};

Step 2: Intercept Navigation Events

Use a global navigation guard or a local beforeRouteLeave guard to intercept navigation events.

beforeRouteLeave(to, from, next) {
  if (this.hasUnsavedChanges()) {
    if (confirm('You have unsaved changes. Do you want to save them before leaving?')) {
      this.saveForm(next);
    } else {
      next();
    }
  } else {
    next();
  }
},

Step 3: Prompt the User

When unsaved changes are detected, prompt the user to save or discard them.

Step 4: Cancel or Continue Navigation

If the user chooses to save changes, call a method to save the form and pass the next callback to handle navigation after saving.

methods: {
  saveForm(next) {
    this.form.put('/save-url', {
      preserveState: true,
      onSuccess: () => {
        this.setInitialFormState();
        next();
      },
      onError: () => {
        // Handle save errors here
      }
    });
  },
},

If the user chooses to discard changes or the save is successful, call next() to continue navigation.

Using Pinia (Optional)

If you're using Pinia, you can centralize the form state in a store, making it easier to manage and access across components.

// store.js
import { defineStore } from 'pinia';

export const useFileStore = defineStore('file', {
  state: () => ({
    form: {
      // Your form fields here
    },
    initialFormState: {},
  }),
  actions: {
    setInitialFormState() {
      this.initialFormState = JSON.parse(JSON.stringify(this.form));
    },
    hasUnsavedChanges() {
      return JSON.stringify(this.form) !== JSON.stringify(this.initialFormState);
    },
    // Add saveForm method here
  },
});

Then, in your component, you would use the store instead of the component's local state.

import { useFileStore } from './store';

export default {
  setup() {
    const fileStore = useFileStore();
    // Use fileStore in your component
  },
  // Rest of the component
};

Remember to handle the save operation properly, considering the user experience and the application's flow. The above examples are a starting point, and you may need to adjust them to fit your specific use case and handle edge cases.