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  Jan 3 2015 10:32PM     John
  1 Comments    5228 Views  
Validating the HTML control is a very important task in any application development.Now this page shows you how to validate the dropdown using java script.

<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); ;


        <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>
    <br >
    <input type="button" class="btn" value="Submit" id="btnSubmit" onclick="ddlValidate();" />


<style type="text/css">
            line-height: 2.0;
            border-radius: 4px;
            border: none;
            font-size: 14px;
            cursor: pointer;
            color: #fff;
            background-color: #00a9da;
            border-color: #0094bf;


You can see live demo from clicking the below Submit button.
Select the course :

Hi, This is John.I hope this page will helps you to validate dropdown using Javascript.Thanks.

Nov 14 2018 4:38AM
how did u did this.
i want to know how to apply java-script externally.
how to link in html file and hoe to start writting in java-script file.

please give ans . thanks.your regards.

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