[Vuejs]-How to disable submit button based on error validation for input field in vuejs?

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In your code there are some mistakes, why are you checking this.errmsg.email < this.email.minemail, I didn’t get why less than < sign is there.

Also, why you need to watch every email id change, just use "input" event and it will do the same job on email change.

I modified the code below, as per what I understand from seeing the variables that you provided above.

<template>
  <div> 
    <input type="text" v-validate="'required'" name="email" placeholder="Enter your company email ID" @input="validateEmail" :maxlength="maxemail" id='email' v-model="email"  />

    <div v-if="errmsg.email"  class="invalid-feedback-register">
    {{errmsg.email}} 
    </div>
    
      <button type="submit" :class="(isDisabled) ? '' : 'selected'"
    :disabled="isDisabled" @click="persist">PROCEED</button>   
  </div>
</template>

<script>
export default {
  data() {
    return {
      email: null,
      errmsg: { email: '' },
      maxemail: 60
    }
  },
  computed: {
    isDisabled () {
      return (!this.email || this.errmsg.email !== '')
    }
  },
  methods: {
    validateEmail() {
      // eslint-disable-next-line
      if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(this.email)) {
        this.errmsg.email = ''
      } else this.errmsg['email'] = 'Invalid Email Address';
      
    },
    persist () {

    }
  }
}

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