What is the best method for verifying password equality using vanilla Vue.js?

I am just starting to learn Vue.js and I want to implement a feature that checks whether passwords match or not. If the passwords do not match, an error message saying Passwords don't match! should be displayed after the user leaves the confirmation field. I have come across some solutions using plugins, but I am interested in knowing the preferred way to achieve this using pure Vue.js.

https://jsfiddle.net/Babrz/L2md63j7/3/

<div id="app">
          <form >
          <div class="form-group">            
            <input type="email" class="form-control" placeholder="Email">            
          </div>
          <br>
          <div class="form-group">
            <input type="password" class="form-control" v-model="password" placeholder="Password">
          </div> 
          <br>

         <div class="form-group">
            <input type="password" class="form-control" v-model="password2" placeholder="Confirm Password">
          </div>
          <small v-if="showError">Passwords don't match!</small>
          <br>

          <div class="form-group">

            <input type="text" class="form-control" placeholder="Age">            
          </div>         

           <br>

          <button type="submit" class="btn login-btn">Register</button>
        </form>
</div>

new Vue({
  el: "#app",
  data: {
    email: '',
    password: '',
    password2: '',
    age: 0,
    showError: false    
  },
  methods: {
    toggle: function(todo){
        todo.done = !todo.done
    }
  }
})

Answer №1

It seems like you're interested in implementing an onblur event to perform a validation on the two password fields. Here's a simple example of how you could achieve this:

...

<input  v-on:blur="validate" type="password" class="form-control" v-model="password2" placeholder="Confirm Passwrd">
...

...
new Vue({
  el: "#app",
  data: {
    email: '',
    password: '',
    password2: '',
    age: 0,
    showError: false
      
    

  },
  methods: {
    toggle: function(todo){
        todo.done = !todo.done
    },
    validate: function() {
        console.log(this.password === this.password2)
    }
  }
})
...

https://v2.vuejs.org/v2/guide/events.html

If you need assistance, consider using a library such as validate.js for more advanced validations on your passwords.

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