Pramod Gehlot

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Populate a dropdownlist control using Javascript in ASP.NET

Mar 7 2013 9:29 AM

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<title>Untitled Page</title>

var month = new Array(11);

month[0] = "Jan";

month[1] = "Feb";

month[2] = "Mar";

month[3] = "Apr";

month[4] = "May";

month[5] = "Jun";

month[6] = "Jul";

month[7] = "Aug";

month[8] = "Sep";

month[9] = "Oct";

month[10] = "Nov";

month[11] = "Dec";

var date = new Date();

function getYear()

{

var opt = new Option("Select Year", "Select Year");

document.forms[0]["ddYear"].options.add(opt);

var currentyear = date.getYear();

for (var i = 1977; i < currentyear - 3; i++)

{

var item = new Option(i, i);

document.forms[0]["ddYear"].options.add(item);

}

function getMonth() {

var opt = new Option("Select Month", "Select Month");

document.forms[0]["ddMonth"].options.add(opt);

for (var i = 0; i <= 11; i++) {

var item = new Option(month[i], month[i]);

document.forms[0]["ddMonth"].options.add(item);

}

function getDays() {

//to clear all the items from ddDay drop down list simply set the length property to 0.

document.forms[0]["ddDay"].length = 0;

if (document.forms[0]["ddYear"].selectedIndex > 0 && document.forms[0]["ddMonth"].selectedIndex > 0) {

var yy = document.forms[0]["ddYear"].value;

var mm = document.forms[0]["ddMonth"].selectedIndex;

// alert(yy + "\n" + mm);

switch (mm) {

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:

for (var i = 1; i <= 31; i++) {

var item = new Option(i, i);

document.forms[0]["ddDay"].options.add(item);

}

break;

case 4:

case 6:

case 9:

case 11:

for (var i = 1; i <= 30; i++) {

var item = new Option(i, i);

document.forms[0]["ddDay"].options.add(item);

}

break;

case 2:

//to calculate if the year is a leap year or not.

if ((yy % 400 == 0) || (yy % 100 != 0 && yy % 4 == 0)) {

for (var i = 1; i <= 29; i++) {

var item = new Option(i, i);

document.forms[0]["ddDay"].options.add(item);

}

else {

for (var i = 1; i <= 28; i++) {

var item = new Option(i, i);

document.forms[0]["ddDay"].options.add(item);

}

</script>

<%--Redirecting Browser to a page if JavaScript support is not there

If you have developed a page which depends on JavaScript for form

validation or for any other purposes then you would be interested

in detecting the setting of the client browser and would like to redirect

to a different page explaining how to enable or disable JavaScript. Here we

will discuss how to check this setting and redirect to a different page accordingly.

We can detect this by using noscript tag and if the JavaScript is disabled then the

code within this noscript tag will be executed. Here is the code to do that. This code will

detect if the script setting is disabled and will redirect to a page explaining how to enable

or disable JavaScript with meta refresh in 2 seconds.

--%>

</noscript>

</head>

<div>

Select Date : Year :

<asp:DropDownList ID="ddYear" runat="server">

</asp:DropDownList>

  Month :

<asp:DropDownList ID="ddMonth" runat="server" onChange="getDays()">

</asp:DropDownList>

 Date :

<asp:DropDownList ID="ddDay" runat="server">

</asp:DropDownList>

</div>

</form>

</body>

</html>

Design of enable_javascript.aspx.aspx page.

NOTE :- we are just simply detecting whether javascript is enabled or not. If not then it will be redirected to enable_javascript.aspx. following is the design code for the same.

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="enable_javascript.aspx.vb"Inherits="enable_javascript" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

#body_content h2 {margin-top: 15px; margin-bottom: 1px; color: #000000; FONT-SIZE: 9pt;font-family: Verdana, Arial, Helvetica, sans-serif;font-weight: bold;}

</style>

</head>

<body>

<div>

<tr><td width="100%" valign="top" class="PPDesTxt"><b>Are you using a browser that doesn't support JavaScript?</b></td></tr>

<tr><td width="100%" valign="top" class="PPDesTxt">If your browser does not support JavaScript, you can upgrade to a newer browser, such as <ahref="http://www.microsoft.com/windows/ie/downloads/ie6/default.asp">Microsoft® Internet Explorer 6</a> or <ahref="http://wp.netscape.com/computing/download/bdp/index.html">Netscape 6</a>.</td></tr>

<tr><td width="100%" valign="top" class="PPDesTxt"><b>Have you disabled JavaScript?</b></td></tr>

<tr><td width="100%" valign="top" class="PPDesTxt">If you have disabled JavaScript, you must re-enable JavaScript to use this page. To enable JavaScript:<br />

<h2>

Internet Explorer 6</h2>

<ol>

<li>On the <b>Tools</b> menu, click <b>Internet Options</b>. </li>

<li>Click the <b>Security</b> tab. </li>

<li>Click <b>Custom Level</b>. </li>

<li>Scroll to <b>Scripting</b>. Under <b>Active scripting</b>, click <b>Enable</b>.

</li>

<li>Click <b>OK</b> twice. </li>

</ol>

<h2>

Netscape 6</h2>

<ol>

<li>On the <b>Edit</b> menu, click <b>Preferences</b>. </li>

<li>Click <b>Advanced</b>. </li>

<li>Select the <b>Enable JavaScript for Navigator</b> check box. </li>

<li>Click <b>OK</b>. </li>

</ol>

<h2>

FireFox</h2>

<ol>

<li>Click <b>Tools</b> </li>

<li>Click <b>Options</b>. </li>

<li>Click <b>Content</b> </li>

<li>Keep the Checkbox checked of <b>Enable JavaScirpt</b>. </li>

<li>Click <b>OK</b> </li>

</ol>

<br />

<SCRIPT type=text/javascript

src="https://apis.google.com/js/plusone.js"></SCRIPT>

</td></tr>

</table>

</table></td>

</tr><tr><td>

</div>

</form>

</body>
</html>

Now just run you web application you'll find the year and the month which ev

this code is not working because i have use master page

this cod use without master page

Answers (1)

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