Jsvalidations/dropdown validation using js.html at main · yashmundada/Jsvalidations · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>
        <span>Select the course : </span>
        <select id="ddlView">
            <option value="0">Select</option>
            <option value="1">Java Script</option>
            <option value="2">CSS</option>
            <option value="3">JQuery</option>
            <option value="3">HTML</option>
            <option value="3">C#</option>
        </select>
    </div>
    <br >
    <input type="button" class="btn" value="Submit" id="btnSubmit" onclick="ddlValidate();" />
    <script type="text/javascript">
        function ddlValidate() {
            var e = document.getElementById("ddlView");
            var optionSelIndex = e.options[e.selectedIndex].value;
            var optionSelectedText = e.options[e.selectedIndex].text;
            if (optionSelIndex == 0) {
                alert("Please select a Course");
            }
            else {
                alert("Success !! You have selected Course : " + optionSelectedText); ;
            }
        }
    </script>
</body>
</html>