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javascript thread: Subtracting days from the current date using Javascript
Message #1 by anne.do@c... on Thu, 21 Nov 2002 14:04:47
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Thanks! That worked. I'm taking a javascript class soon so I'll know better
when to use = versus ==. Thanks again
Anne
-----Original Message-----
From: sara [mailto:fillet70@h...]
Sent: Thursday, November 21, 2002 10:53 AM
To: javascript
Subject: [javascript] Re: Subtracting days from the current date using
Javascript
Here is the solution. What you did did not work because the value in the
days field is a text field. You have check its value before you use the
parseInt function to convert it to a number.
<html>
<head>
<SCRIPT LANGUAGE="JavaScript">
<!--
function MakeDate()
{
//Calculation of a day in milliseconds.
var oneday = 60 * 1000 * 60 * 24 ;
var days =
document.searchform.Days.options
[document.searchform.Days.selectedIndex].value
if (days == "ALL")
{
document.searchform.startdate.value = "";
}
else
{
var daysback=
parseInt(days)
// var startdate = (I want startdate=today's date-daysback)
var currdate = new Date()
var currdatems = currdate.getTime()
var diffms = oneday * daysback
var daysbackdate = new Date()
daysbackdate.setTime(currdatems - diffms)
var startdate = (daysbackdate.getMonth() + 1) + "/" + daysbackdate.getDate
() + "/" + daysbackdate.getFullYear()
document.searchform.startdate.value = startdate;
}
}
//-->
</SCRIPT>
<form name="searchform">
<select name="Days" size=1 onChange="MakeDate()">
<option value="10">10 </option>
<option value="20">20</option>
<option value="30">30 </option>
<option value="ALL"> Search all dates </option>
</select>
<input name="startdate" type="text" size="10">
</form>
</BODY>
</html>
> I have a form that I want to be dyanmic. When the drop down select box
n> ame days is selected I want Javascript to run and subtract the number
of
d> ays selected from today's date. Below is what I have so far. Please
a> dvise on how I can do the date subtraction:
> <SCRIPT LANGUAGE="JavaScript">
<> !--
f> unction MakeDate()
{>
v> ar daysback=
d>
ocument.SearchForm.Days.optionsdocument.SearchForm.Days.selectedIndex].val
u> e
> var startdate = (I want startdate=today's date-daysback)
> document.SearchForm.startdate.value = startdate;
}>
> //-->
<> /SCRIPT>
> <form name="searchform">
<> select name="Days" size=1 onChange="MakeDate()">
> <option value="10">10 </option>
> <option value="20">20</option>
> <option value="30">30 </option>
> </select>
>
<> input name="startdate" type="text" size="10">
> </form>
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