?? ch6_examp9.htm
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<HTML>
<HEAD>
<SCRIPT LANGUAGE=JavaScript>
function writeOptions(startNumber, endNumber)
{
var optionCounter;
for (optionCounter = startNumber; optionCounter <= endNumber; optionCounter++)
{
document.write('<OPTION value=' + optionCounter + '>' + optionCounter);
}
}
function writeMonthOptions()
{
var theMonth;
var monthCounter;
var theDate = new Date();
for (monthCounter = 0; monthCounter < 12; monthCounter++)
{
theDate.setMonth(monthCounter);
theMonth = theDate.toString();
theMonth = theMonth.substr(4,3);
document.write('<OPTION value=' + theMonth + '>' + theMonth);
}
}
function recalcDateDiff()
{
var myForm = document.form1;
var firstDay = myForm.firstDay.options[myForm.firstDay.selectedIndex].value;
var secondDay =
myForm.secondDay.options[myForm.secondDay.selectedIndex].value;
var firstMonth =
myForm.firstMonth.options[myForm.firstMonth.selectedIndex].value;
var secondMonth =
myForm.secondMonth.options[myForm.secondMonth.selectedIndex].value;
var firstYear =
myForm.firstYear.options[myForm.firstYear.selectedIndex].value;
var secondYear =
myForm.secondYear.options[myForm.secondYear.selectedIndex].value;
var firstDate = new Date(firstDay + " " + firstMonth + " " + firstYear);
var secondDate = new Date(secondDay + " " + secondMonth + " " + secondYear);
var daysDiff = (secondDate.valueOf() - firstDate.valueOf());
daysDiff = Math.floor(Math.abs((((daysDiff / 1000) / 60) / 60) / 24));
myForm.txtDays.value = daysDiff;
return true;
}
function window_onload()
{
var theForm = document.form1;
var nowDate = new Date();
theForm.firstDay.options[nowDate.getDate() - 1].selected = true;
theForm.secondDay.options[nowDate.getDate() - 1].selected = true;
theForm.firstMonth.options[nowDate.getMonth()].selected = true;
theForm.secondMonth.options[nowDate.getMonth()].selected = true;
theForm.firstYear.options[nowDate.getFullYear()- 1970].selected = true;
theForm.secondYear.options[nowDate.getFullYear() - 1970].selected = true;
}
</SCRIPT>
</HEAD>
<BODY LANGUAGE=JavaScript onload="return window_onload()">
<FORM NAME=form1>
<P>
First Date<BR>
<SELECT NAME=firstDay SIZE=1 onchange="return recalcDateDiff()">
<SCRIPT LANGUAGE=JavaScript>
writeOptions(1,31);
</SCRIPT>
</SELECT>
<SELECT NAME=firstMonth SIZE=1 onchange="return recalcDateDiff()">
<SCRIPT LANGUAGE=JavaScript>
writeMonthOptions();
</SCRIPT>
</SELECT>
<SELECT NAME=firstYear SIZE=1 onchange="return recalcDateDiff()">
<SCRIPT LANGUAGE=JavaScript>
writeOptions(1970,2010);
</SCRIPT>
</SELECT>
</P>
<P>
Second Date<BR>
<SELECT NAME=secondDay SIZE=1 onchange="return recalcDateDiff()">
<SCRIPT LANGUAGE=JavaScript>
writeOptions(1,31);
</SCRIPT>
</SELECT>
<SELECT NAME=secondMonth SIZE=1 onchange="return recalcDateDiff()">
<SCRIPT LANGUAGE=JavaScript>
writeMonthOptions();
</SCRIPT>
</SELECT>
<SELECT NAME=secondYear SIZE=1 onchange="return recalcDateDiff()">
<SCRIPT LANGUAGE=JavaScript>
writeOptions(1970,2010);
</SCRIPT>
</SELECT>
</P>
Total difference in days
<INPUT TYPE="text" NAME=txtDays VALUE=0>
<BR>
</FORM>
</BODY>
</HTML>
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