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Change the floating label color of the TextBox

You can change the floating label color of the TextBox for both success and warning validation states by applying the following CSS styles.

    /* For Success state */
    .e-float-input.e-success label.e-float-text,
    .e-float-input.e-success input:focus ~ label.e-float-text,
    .e-float-input.e-success input:valid ~ label.e-float-text {
      color: #22b24b;
    }

    /* For Warning state */
    .e-float-input.e-warning label.e-float-text,
    .e-float-input.e-warning input:focus ~ label.e-float-text,
   .e-float-input.e-warning input:valid ~ label.e-float-text {
      color: #ffca1c;
    }
Source
Preview
app.vue
<template>
    <div class ='wrap'>
        <div id ='input-container'>
            <div class="e-input-group e-float-input e-success">
                <input type="text" required>
                <span class="e-float-line"></span>
                <label class="e-float-text">Success</label>
            </div>
            <div class="e-input-group e-float-input e-warning">
                <input type="text" required>
                <span class="e-float-line"></span>
                <label class="e-float-text">Warning</label>
            </div>
        </div>
    </div>
</template>
<script>
import Vue from 'vue';

export default {
   data: function() {
        return { }
    },
    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');
                }
            });
        }

        // Add 'e-input-btn-ripple' class to the icon element for achive ripple effect when click on the icon.

        var inputIcon = document.querySelectorAll('.e-input-group-icon');
        for (let i = 0; i < inputIcon.length; i++) {
            inputIcon[i].addEventListener('mousedown', function () {
                this.classList.add('e-input-btn-ripple');
            });
            inputIcon[i].addEventListener('mouseup', function () {
                let element = this;
                setTimeout(function () {
                    element.classList.remove('e-input-btn-ripple');
                }, 500);
            });
        }
    });
}
</script>
<style>
  @import "../../node_modules/@syncfusion/ej2-base/styles/material.css";
  @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-float-input.e-success label.e-float-text{ /* csslint allow: adjoining-classes */
    color: #22b24b;
  }
  .e-float-input.e-success input:focus ~ label.e-float-text{ /* csslint allow: adjoining-classes */
    color: #22b24b;
  }
  .e-float-input.e-success input:valid ~ label.e-float-text { /* csslint allow: adjoining-classes */
    color: #22b24b;
  }

  .e-float-input.e-warning label.e-float-text{ /* csslint allow: adjoining-classes */
    color: #ffca1c;
  }
  .e-float-input.e-warning input:focus ~ label.e-float-text{ /* csslint allow: adjoining-classes */
    color: #ffca1c;
  }
  .e-float-input.e-warning input:valid ~ label.e-float-text { /* csslint allow: adjoining-classes */
    color: #ffca1c;
  }

</style>