<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="https://www.jb51.net/jquery.js"></script>
<script>
$(function(){
$('#year').change(function(){
if (ifLeapYear($(this).val()))
{
if ($('#month').val() == 2 && $('#day').children().length == 29)
{
$('#day').append('<option value="29">29</option>');
}
} else
{
if ($('#month').val() == 2 && $('#day').children().length == 30)
{
$('#day :last-child').remove();
}
}
});
$('#month').change(function(){
var thisValue = $(this).val();
var dayValue = $('#day').val();
var month1 = ['4','6','9','11'];
$('#day').html('<option value="">-请选择-</option>');
var day = '';
if (thisValue == '')
{
return false;
}
if ($.inArray(thisValue, month1) != -1)
{
day = setDay(30);
$('#day').append(day);
} else if ($(this).val() == '2')
{
if ($('#year').val() != '' && ifLeapYear($('#year').val()))
{
day = setDay(29);
} else
{
day = setDay(28);
}
$('#day').append(day);
} else
{
day = setDay(31);
$('#day').append(day);
}
$('#day').find('option[value='+dayValue+']').attr('selected',true);
});
})
function setDay(day)
{
var dayInfo = '';
for (var i=1; i<=day; i++)
{
dayInfo += '<option value="' + i +'">' + i+ '</option>';
}
return dayInfo;
}
function ifLeapYear(year)
{
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
{
return true;
} else
{
return false;
}
}
</script>
<select><option value="">-请选择-</option>
<?php for ($i=1980;$i<2012;$i++){ ?>
<option value="<?php echo $i ?>"><?php echo $i ?></option>
<?php } ?>
</select>年
<select><option value="">-请选择-</option>
<?php for ($i=1;$i<=12;$i++){ ?>
<option value="<?php echo $i ?>"><?php echo $i ?></option>
<?php } ?>
</select>月
<select><option value="">-请选择-</option></select>日
js日期联动示例
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