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  Jan 3 2015 10:32PM     John
  5 Comments    7080 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.
Barath Kumar
Dec 20 2018 11:10PM
Hi Parthtank, Right click on the project and create new java script file and start writing your own js code. And then just drag and drop from solution explore to actual page with in head tag. Thanks
Barath Kumar
Dec 21 2018 11:21AM
This is the actual syntax to include Java script file in to your html page
Barath Kumar
Dec 21 2018 11:22AM
Barath Kumar
Dec 21 2018 11:23AM

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