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Add floating label to read-only textbox

You can achieve floating label for read-only textboxes by adding/removing e-label-top and e-label-bottom classes to the label element

In this sample, click the update value button to fill the read-only textbox with value and float a label.

Source
Preview
index.js
index.html
index.css
ej.base.enableRipple(true);

function checkFloatingLabel(id) {
    var inputElement = document.getElementById(id);
    var labelElement = inputElement.parentElement.querySelector('.e-float-text');
    if (inputElement.value !== '') {
        labelElement.classList.remove('e-label-bottom');
        labelElement.classList.add('e-label-top');
    }
    else {
        labelElement.classList.remove('e-label-top');
        labelElement.classList.add('e-label-bottom');
    }
}
var inputField = document.getElementById('myText');
document.getElementById('valuebtn').onclick = function () {
    document.getElementsByClassName('myField')[0].value = '10';
    checkFloatingLabel('myText');
};
document.getElementById('removebtn').addEventListener('click', function () {
    document.getElementsByClassName('myField')[0].value = '';
    checkFloatingLabel('myText');
});
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 TextBox</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 TextBox Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container' class="text_value">
        <div id="input-container"></div>



        <div class="row">
            <div class="col-xs-6 col-sm-6 col-lg-6 col-md-6">
                <div class="e-float-input">
                    <input class="e-input myField" id="myText" name="readonlyAttr"  type="text" readOnly>
                    <span class="e-float-line"></span>
                    <label class="e-float-text">Enter value</label>
                </div>
            </div>
        </div>
        <div class="row">
            <div class="col-xs-10 col-sm-10 col-lg-10 col-md-10">
                <button class="e-btn update_value" id='valuebtn' >Set value</button>
                <button class="e-btn remove_value" id='removebtn' >Remove value</button>
            </div>
        </div>




    </div>
</body>
</html>
#container {
    visibility: hidden;
  }
  
  #loader {
    color: #008cff;
    font-family: 'Helvetica Neue','calibiri';
    font-size: 14px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
  }
  
.update_value, .remove_value {
    margin-top: 20px;
}

.remove_value {
    margin-left: 10px;
}

.text_value {
    visibility: visible;
    box-sizing: border-box;
    margin: 0 auto;
    padding: 20px 10px;
    width: 260px;
}