What is a universal method to express "not yet interacted with" in Vue?

When I have an input field, I want to check the content before submitting it. Depending on whether the input is correct or incorrect, I apply a specific class for user feedback:

new Vue({
  el: "#app",
  data: {
    input: ""
  },
  methods: {
    getClass() {
      if (this.input == "") {
        return "ko";
      } else {
        return "ok";
      }
    }
  }
});
.ok {
  border-width: 3px;
  border-color: green;
}

.ko {
  border-width: 5px;
  border-color: red;
}

.initial {
  border-width: 1px;
  border-color: gray;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.11/vue.js"></script>
<div id="app">
  <input v-bind:class="getClass(input)" v-model="input">
</div>

Although this setup works well, I wish to have a neutral style applied to the field initially (<input> in the example above) and have the initial class assigned in that scenario.

Is there an easy way to achieve this in Vue? Currently, my solution involves listening to each click event and setting the class accordingly (initial first, then the appropriate one based on content), but this feels cumbersome.
Basically, I don't want any visual indication given to the user until their first interaction with the element.

Any suggestions on how to naturally implement this?

Answer №1

Include a new property called touched in the data section, which is a Boolean indicating whether an input has been interacted with or not.

new Vue({
  el: "#app",
  data: {
    input: "",
    touched: false
  },
  methods: {
    getClass() {
        if(!this.touched){
            return 'initial';
        }else{
            if(this.input == "") {
                return "ko";
            } else {
                return "ok";
            }
        }

    }
  }
}); 

Update the value of touched to true when the input changes

<input v-bind:class="getClass(input)" @change="this.touched = true" v-model="input">

Answer №2

To address this issue, one approach could be:

  1. Include "isInteracted": false in the data object
  2. Monitor changes to the input and update isInteracted to true whenever there is a change
  3. Avoid applying any classes unless isInteracted has been set to true

By following this approach, the highlighting functionality will only activate once the user has inputted something.

Answer №3

Utilizing the .once modifier, it seems like this particular functionality was specifically designed for this purpose. Here is what I believe to be the most concise and declarative solution:

new Vue({
  el: "#app",
  data: {
    input: "",
    isTouched: false
  },
  methods: {
    getClass() {
      return this.isTouched ? "ko" : "ok"
    }
  }
});

<div id="app">
  <input
    :class="getClass(input)"
    v-model="input"
    @input.once="isTouched = true"
  >
</div>

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