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Client side validation

To achieve the client side validation in a DatePicker component by using Essential JavaScript 2 FormValidator. It provides an option to customize the feedback error messages to the corresponding fields to take action to resolve the issue.

In this below example, the required field validation is implemented by mapping the name attribute value to the rules property. It will validate the DatePicker component and display the validation message when the textbox value is empty during form post back or focus out.

Source
Preview
index.js
index.html
var datepicker = new ej.calendars.DatePicker({
        placeholder: 'Choose a date',
         // sets the value
        value: new Date()
    });

    var options = {
    rules: {
        'datevalue': { required: true }
    },
    customPlacement: function (inputElement, errorElement) {
        //to place the error message in custom position.
        inputElement.parentElement.parentElement.appendChild(errorElement);
    }
};

    var formObject = new ej.inputs.FormValidator('#form-element', options);
    datepicker.appendTo('#element');
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 DatePicker control</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="styles.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/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-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
<script src="//cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <form id="form-element" class="form-vertical">
            <div class="form-group">
                <div class="col-sm-6">
                    <input type="text" id="element" name="datevalue" class="form-control">
                </div>
            </div>
        </form>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>