storing prepopulated form fields in vue

Question

storing prepopulated form fields in vue

As I work on a complex form, my goal is to ensure that users do not lose their data when reloading the browser. Thankfully, modern browsers automatically refill data on reloads - even inputs with v-model retain their values during beforeMount. However, they lose this data once they reach mounted, as they are filled with empty data from the model. I am considering filling the model on beforeMounted with data extracted from the DOM. Is there a way to get the reference of a v-model linked to the object in the DOM? Alternatively, what other methods would you recommend for achieving this?

javascript input vue.js autofill

Answer 1

Answer №1

Imagine you're setting up a new user, which means you already have the user model defined within your component like this:

data () {
  return {
    user: {
      email: '',
      password: ''
    }
  }
}

Next, you have an input element structured as

<input type="email" v-model.lazy="user.email" />

(pay attention to the lazy modifier for better performance).

To further enhance this setup, you can add a watcher for the user model that saves its values in sessionStorage (or localStorage if preferred). Refer to the documentation here: https://v2.vuejs.org/v2/guide/computed.html#Watchers

In your component, include:

watch: {
  user (newValues, oldValues) {
    window.sessionStorage.setItem('userData', JSON.stringify(newValues))
  }
}

Before mounting the component, ensure you load the stored values with:

created () { // created hook
  let userData = window.sessionStorage.getItem('userData')

  if (userData) {
    try {
      userData = JSON.parse(userData)

      // assign values to the model
      this.user.email = userData.email
      this.user.password = userData.password
    } catch (err) {
      // handle invalid json string
    }
  }
}

Answer 2

Imagine you're setting up a new user, which means you already have the user model defined within your component like this:

data () {
  return {
    user: {
      email: '',
      password: ''
    }
  }
}

Next, you have an input element structured as

<input type="email" v-model.lazy="user.email" />

(pay attention to the lazy modifier for better performance).

To further enhance this setup, you can add a watcher for the user model that saves its values in sessionStorage (or localStorage if preferred). Refer to the documentation here: https://v2.vuejs.org/v2/guide/computed.html#Watchers

In your component, include:

watch: {
  user (newValues, oldValues) {
    window.sessionStorage.setItem('userData', JSON.stringify(newValues))
  }
}

Before mounting the component, ensure you load the stored values with:

created () { // created hook
  let userData = window.sessionStorage.getItem('userData')

  if (userData) {
    try {
      userData = JSON.parse(userData)

      // assign values to the model
      this.user.email = userData.email
      this.user.password = userData.password
    } catch (err) {
      // handle invalid json string
    }
  }
}

Answer 3

Answer №2

Utilizing the inherent capabilities of the browser is my primary focus here, as I can integrate this simple technique into a universal mixin or plugin without being tied to any particular data structure. By storing all necessary information in the DOM and updating it post mounted event, I ensure seamless functionality.

export default {
    beforeMount() {
        document.querySelectorAll('input').forEach((el) => {
            if (el.value) {
                el.setAttribute('data-prefill', el.value)
            }
        })
    },
    mounted() {
        this.$el.querySelectorAll('[data-prefill]').forEach((el) => {
            this.$nextTick(function() {
                el.value = el.getAttribute('data-prefill')
                el.dispatchEvent(new Event('change'))
                el.dispatchEvent(new Event('input'))
            })
        })
    }

Answer 4

Utilizing the inherent capabilities of the browser is my primary focus here, as I can integrate this simple technique into a universal mixin or plugin without being tied to any particular data structure. By storing all necessary information in the DOM and updating it post mounted event, I ensure seamless functionality.

export default {
    beforeMount() {
        document.querySelectorAll('input').forEach((el) => {
            if (el.value) {
                el.setAttribute('data-prefill', el.value)
            }
        })
    },
    mounted() {
        this.$el.querySelectorAll('[data-prefill]').forEach((el) => {
            this.$nextTick(function() {
                el.value = el.getAttribute('data-prefill')
                el.dispatchEvent(new Event('change'))
                el.dispatchEvent(new Event('input'))
            })
        })
    }

storing prepopulated form fields in vue

Answer №1

Answer №2

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