How to use Vue form processing to realize automatic saving and restoration of forms

How to use Vue form processing to realize automatic saving and restoration of forms

In modern web development, forms are a user input interaction method that we often use. However, users may encounter various unexpected situations when filling out forms, such as web page refreshes, unexpected browser closings, etc., which will result in the loss of data filled in by users. In order to improve the user experience, we can use Vue form processing to realize the automatic saving and restoring function of the form.

1. Automatically saving the form

In order to realize the automatic saving function of the form, we need to save the data filled in by the user to local storage. Vue provides localStorage to implement local storage functions.

In the Vue component, we can use the computed attribute to monitor changes in form data and save the data to localStorage. The code example is as follows:

export default {
  data() {
    return {
      formData: {
        name: '',
        age: '',
        email: ''
      }
    }
  },
  computed: {
    formDataStr() {
      return JSON.stringify(this.formData);
    }
  },
  watch: {
    formDataStr: {
      handler(newVal) {
        localStorage.setItem('formData', newVal);
      },
      immediate: true
    }
  }
}

In the above code, we convert the form data into a string through the computed attribute formDataStr, and monitor changes in this attribute through watch. Whenever the form data changes, the latest data will be automatically saved to localStorage.

2. Form data recovery

When the user visits the form page again, we need to restore the previously saved data from localStorage. In the Vue component, we can use the created life cycle hook function to implement the data recovery function.

export default {
  data() {
    return {
      formData: {
        name: '',
        age: '',
        email: ''
      }
    }
  },
  created() {
    const formDataStr = localStorage.getItem('formData');
    if (formDataStr) {
      this.formData = JSON.parse(formDataStr);
    }
  }
}

In the above code, we use the created life cycle hook function to determine whether there is previously saved form data in localStorage. If so, it will be parsed and assigned to formData to complete the data recovery.

3. Form data clearing

After the user successfully submits the form data, we need to clear the data saved in localStorage so that the next time the form is refilled, it can start from a blank state. In the Vue component, we can use the destroyed life cycle hook function to implement the data clearing function.

export default {
  // ...
  destroyed() {
    localStorage.removeItem('formData');
  }
  // ...
}

In the above code, we use the destroyed life cycle hook function to remove the form data saved in localStorage. In this way, when the user successfully submits the form, the form will be reset to its initial state the next time he visits the form page.

Through the above steps, we can use Vue form processing to realize the automatic saving and restoring function of the form. Users do not need to worry about data loss caused by accidents, which improves user experience. At the same time, we can also clear the data in localStorage to ensure that the next time we fill in the form, it will always be in a completely new state.

To sum up, using Vue form processing, we can easily implement the automatic saving and restoring functions of the form, improve the user experience, and give users a better experience.

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