Hide / unhide dropdownlist in DateTime Picker

Question

I am writing an ASP.NET application and using javascript DateTime Picker code (I have found it on the Internet):
<script type="text/javascript">
// <!-- <![CDATA[
// Code begin...
// Set the initial date.
var ds_i_date = new Date();
ds_c_month = ds_i_date.getMonth() + 1;
ds_c_year = ds_i_date.getFullYear();
// Get Element By Id
function ds_getel(id) {
    return document.getElementById(id);
// Get the left and the top of the element.
function ds_getleft(el) {
    var tmp = el.offsetLeft;
    el = el.offsetParent
    while(el) {
        tmp += el.offsetLeft;
        el = el.offsetParent;
    return tmp;
function ds_gettop(el) {
    var tmp = el.offsetTop;
    el = el.offsetParent
    while(el) {
        tmp += el.offsetTop;
        el = el.offsetParent;
    return tmp;
// Output Element
var ds_oe = ds_getel('ds_calclass');
// Container
var ds_ce = ds_getel('ds_conclass');
// Output Buffering
var ds_ob = '';
function ds_ob_clean() {
    ds_ob = '';
function ds_ob_flush() {
    ds_oe.innerHTML = ds_ob;
    ds_ob_clean();
function ds_echo(t) {
    ds_ob += t;
var ds_element; // Text Element...
var ds_monthnames = [
'Jan', 'Feb', 'Mars', 'Apr', 'Mai', 'Jun',
'Jul', 'Agu', 'Sep', 'Okt', 'Nov', 'Des'
]; // You can translate it for your language.
var ds_daynames = [
'Sun', 'Man', 'Tue', 'Wen', 'Thu', 'Fri', 'Sat'
]; // You can translate it for your language.
// Calendar template
function ds_template_main_above(t) {
    return '<table cellpadding="3" cellspacing="1" class="ds_tbl">'
         + '<tr>'
         + '<td class="ds_head" style="cursor: pointer" onclick="ds_py();"><<</td>'
         + '<td class="ds_head" style="cursor: pointer" onclick="ds_pm();"><</td>'
         + '<td class="ds_head" style="cursor: pointer" onclick="ds_hi();" colspan="3">[Close]</td>'
         + '<td class="ds_head" style="cursor: pointer" onclick="ds_nm();">></td>'
         + '<td class="ds_head" style="cursor: pointer" onclick="ds_ny();">>></td>'
         + '</tr>'
         + '<tr>'
         + '<td colspan="7" class="ds_head">' + t + '</td>'
         + '</tr>'
         + '<tr>';
function ds_template_day_row(t) {
    return '<td class="ds_subhead">' + t + '</td>';
    // Define width in CSS, XHTML 1.0 Strict doesn't have width property for it.
function ds_template_new_week() {
    return '</tr><tr>';
function ds_template_blank_cell(colspan) {
    return '<td colspan="' + colspan + '"></td>'
function ds_template_day(d, m, y) {
    return '<td class="ds_cell" onclick="ds_onclick(' + d + ',' + m + ',' + y + ')">' + d + '</td>';
    // Define width the day row.
function ds_template_main_below() {
    return '</tr>'
         + '</table>';
// This one draws calendar...
function ds_draw_calendar(m, y) {
    // First clean the output buffer.
    ds_ob_clean();
    // Here we go, do the header
    ds_echo (ds_template_main_above(ds_monthnames[m - 1] + ' ' + y));
    for (i = 0; i < 7; i ++) {
        ds_echo (ds_template_day_row(ds_daynames));
// Make a date object.
var ds_dc_date = new Date();
ds_dc_date.setMonth(m - 1);
ds_dc_date.setFullYear(y);
ds_dc_date.setDate(1);
if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12) {
days = 31;
} else if (m == 4 || m == 6 || m == 9 || m == 11) {
days = 30;
} else {
days = (y % 4 == 0) ? 29 : 28;
var first_day = ds_dc_date.getDay();
var first_loop = 1;
// Start the first week
ds_echo (ds_template_new_week());
// If sunday is not the first day of the month, make a blank cell...
if (first_day != 0) {
ds_echo (ds_template_blank_cell(first_day));
var j = first_day;
for (i = 0; i < days; i ++) {
// Today is sunday, make a new week.
// If this sunday is the first day of the month,
// we've made a new row for you already.
if (j == 0 && !first_loop) {
// New week!!
ds_echo (ds_template_new_week());
// Make a row of that day!
ds_echo (ds_template_day(i + 1, m, y));
// This is not first loop anymore...
first_loop = 0;
// What is the next day?
j ++;
j %= 7;
// Do the footer
ds_echo (ds_template_main_below());
// And let's display..
ds_ob_flush();
// Scroll it into view.
ds_ce.scrollIntoView();
// A function to show the calendar.
// When user click on the date, it will set the content of t.
function ds_sh(t) {
document.form1.dropDownList.display = false; //this line not working
// Set the element to set...
ds_element = t;
// Make a new date, and set the current month and year.
var ds_sh_date = new Date();
ds_c_month = ds_sh_date.getMonth() + 1;
ds_c_year = ds_sh_date.getFullYear();
// Draw the calendar
ds_draw_calendar(ds_c_month, ds_c_year);
// To change the position properly, we must show it first.
ds_ce.style.display = '';
// Move the calendar container!
the_left = ds_getleft(t);
the_top = ds_gettop(t) + t.offsetHeight;
ds_ce.style.left = the_left + 'px';
ds_ce.style.top = the_top + 'px';
// Scroll it into view.
ds_ce.scrollIntoView();
// Hide the calendar.
function ds_hi() {
ds_ce.style.display = 'none';
document.form1.dropDownList.display = true; //this line not working
// Moves to the next month...
function ds_nm() {
// Increase the current month.
ds_c_month ++;
// We have passed December, let's go to the next year.
// Increase the current year, and set the current month to January.
if (ds_c_month > 12) {
ds_c_month = 1;
ds_c_year++;
// Redraw the calendar.
ds_draw_calendar(ds_c_month, ds_c_year);
// Moves to the previous month...
function ds_pm() {
ds_c_month = ds_c_month - 1; // Can't use dash-dash here, it will make the page invalid.
// We have passed January, let's go back to the previous year.
// Decrease the current year, and set the current month to December.
if (ds_c_month < 1) {
ds_c_month = 12;
ds_c_year = ds_c_year - 1; // Can't use dash-dash here, it will make the page invalid.
// Redraw the calendar.
ds_draw_calendar(ds_c_month, ds_c_year);
// Moves to the next year...
function ds_ny() {
// Increase the current year.
ds_c_year++;
// Redraw the calendar.
ds_draw_calendar(ds_c_month, ds_c_year);
// Moves to the previous year...
function ds_py() {
// Decrease the current year.
ds_c_year = ds_c_year - 1; // Can't use dash-dash here, it will make the page invalid.
// Redraw the calendar.
ds_draw_calendar(ds_c_month, ds_c_year);
// Format the date to output.
function ds_format_date(d, m, y) {
// 2 digits month.
m2 = '00' + m;
m2 = m2.substr(m2.length - 2);
// 2 digits day.
d2 = '00' + d;
d2 = d2.substr(d2.length - 2);
// DD.MM.YYY
return d2 + '.' + m2 + '.' + y;
// When the user clicks the day.
function ds_onclick(d, m, y) {
// Hide the calendar.
ds_hi();
// Set the value of it, if we can.
if (typeof(ds_element.value) != 'undefined') {
ds_element.value = ds_format_date(d, m, y);
// Maybe we want to set the HTML in it.
} else if (typeof(ds_element.innerHTML) != 'undefined') {
ds_element.innerHTML = ds_format_date(d, m, y);
// I don't know how should we display it, just alert it to user.
} else {
alert (ds_format_date(d, m, y));
// And here is the end.
// ]]> -->
<!--DateTime Picker code-->
</script>
Also I have to use DropDownList below this DateTime Picker. In the IE 6.0 "DropDownList" control comes in front of this calendar (this is a known problem in IE 6.0, that is form items appear infront of all other).
And now I am trying to hide the form items as the DateTime Picker is shown and display them again as the calendar is closed. For this action I am using:
document.form1.dropDownList.display = true / false in the "function ds_sh(t)" and "function ds_hi()"
but its not working (not hide or unhide, no action).
Maybe somebody could help me in this situation.
Thanks in advance.
br,
Forumaic

Answer 1

I replaced these to lines that not worked in the DateTime picker with this one:
var obj = document.getElementById('ddlTest');
    obj.style.visibility = "visible";
var obj = document.getElementById('ddlTest');
    obj.style.visibility = "hidden";And now everything working like it should be.
Forumaic.