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Change the color of the TextBox based on its value

You can change the color of the TextBox by validating its value using regular expression in the keyup event for predicting the numeric values as demonstrated in the following code sample.

Source
Preview
app.vue
<template>
    <div class ='wrap'>
        <div id ='input-container'>
            <label>Normal Input</label>
            <div class="e-input-group">
                <input class="e-input" type="text" placeholder="Enter numeric values" @keyup="onKeyup" />
            </div>
                <label> Floating Input </label>
            <div class="e-float-input">
                <input type="text" @keyup="onKeyup" required />
                <span class="e-float-line"> </span>
                <label class="e-float-text">Enter numeric values</label>
            </div>
        </div>
    </div>
</template>
<script>
import Vue from 'vue';

export default {
   data: function() {
        return { }
    },
    methods: {
        // To Configure RegExp for predicting Numeric values on keyUp event function

        onKeyup(e) {
            let str = e.target.value.match(/^[0-9]+$/);
            if (!((str && str.length > 0)) && e.target.value.length) {
            e.target.parentElement.classList.add('e-error');
            } else {
            e.target.parentElement.classList.remove('e-error');
            }
        }
    }
    mounted: function() {
        // To get the all input fields and its container.

        let inputElement = document.querySelectorAll('.e-input-group .e-input,.e-float-input.e-input-group input');

        // Add 'e-input-focus' class to the input for achive ripple effect when focus on the input field.

        for (let i = 0; i < inputElement.length; i++) {
            inputElement[i].addEventListener("focus", function () {
                let parentElement = this.parentNode;
                if (parentElement.classList.contains('e-input-in-wrap')) {
                    parentElement.parentNode.classList.add('e-input-focus');
                } else {
                    this.parentNode.classList.add('e-input-focus');
                }
            });
            inputElement[i].addEventListener("blur", function () {
                let parentElement = this.parentNode;
                if (parentElement.classList.contains('e-input-in-wrap')) {
                    parentElement.parentNode.classList.remove('e-input-focus');
                } else {
                    this.parentNode.classList.remove('e-input-focus');
                }
            });
        }
    });
}
</script>
<style>
  @import "../../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";

  .wrap {
    box-sizing: border-box;
    margin: 0 auto;
    padding: 20px 10px;
    width: 340px;
  }

  #input-container .e-input-group { /* csslint allow: adjoining-classes */
    margin: 30px 0;
  }
  #input-container .e-float-input { /* csslint allow: adjoining-classes */
    margin: 30px 0;
  }
  .e-input-group.e-error .e-input { /* csslint allow: adjoining-classes */
    color: #f44336;
  }

  .e-float-input.e-error input { /* csslint allow: adjoining-classes */
    color: #f44336;
  }

  .wrap label { /* csslint allow: adjoining-classes */
    font-weight:bold;
  }

</style>