In my previous tutorials, I’d explained how to validate dropdownlist using javascript, validate radiobuttonlist using jquery, validate checkboxlist using jquery and other more cracking tutorials on DropDownList, Asp.net here.
Validation is one of the greatest security features to prevent your website against spam. We can do validation in two ways. One is from client-side and another is from server-side validation. Now here in this tutorial, I’ll explain how to proceed with dropdownlist validation using JQuery from client-side in asp.net.
Now we are going to implement the code, follow the step by step guidelines to proceed with the dropdownlist validation using JQuery.
First we need to give reference of jQuery under head section. You can simply use below line in head section of your .aspx page.
jQuery Reference
</script>
After applying jQuery, you are now ready to use jQuery built-in events and functions. Here is the jQuery Script that use to validate DropDownList.
Function To Validate Asp.net DropDownList Control – [jQuery]
$(document).ready(function () {
$(“[id$=btnSave]”).click(function () {
if ($(“[id$=ddlImageFormat]”).val() > 0) {
//Selected option from dropdownlist
return true;
} else {
//Not selected so alert user to select any option
alert(‘Please select image format from the list.’);
return false;
}
});
});
</script>
HTML Markup For DropDownList Validation – [.aspx]
Following is the complete HTML Markup code for .aspx page:
<head id=”Head1″ runat=”server”>
<title>DropDownList Validation using jQuery</title>
<script type=”text/javascript” src=”http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js”>
</script>
<script type=”text/javascript”>
$(document).ready(function () {
$(“[id$=btnSave]”).click(function () {
if ($(“[id$=ddlImageFormat]”).val() > 0) {
//Selected option from dropdownlist
return true;
} else {
//Not selected so alert user to select any option
alert(‘Please select image format from the list.’);
return false;
}
});
});
</script>
</head>
<body>
<form id=”form1″ runat=”server”>
<div>
<table>
<tr>
<td>Select Image Format</td>
<td>:</td>
<td>
<asp:DropDownList ID=”ddlImageFormat” runat=”server” RepeatDirection=”Horizontal”>
<asp:ListItem Value=”0″ Text=”Please select” />
<asp:ListItem Value=”1″ Text=”.jpg” />
<asp:ListItem Value=”2″ Text=”.png” />
<asp:ListItem Value=”3″ Text=”.gif” />
</asp:DropDownList>
</td>
</tr>
<tr>
<td colspan=”3″> </td>
</tr>
<tr>
<td colspan=”2″> </td>
<td>
<asp:Button ID=”btnSave” runat=”server” Text=”Save” />
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
Example Result
