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Subject:
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selectedIndex is NULL or not an Object
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Posted By:
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lewdogg
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Post Date:
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9/28/2006 9:29:20 AM
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When calling a function to validate dates in select fields, I get the error "selectedIndex is null or not an object". When I call the function when the field is changed, it works fine. Why can't the function see which index is selected when the form loads but it can when a field is changed? The error occurs when DOMonth.selectedIndex is referenced under "if (pudo == "do"). The code is as follows...
<script>
changedodate('do');
</script>
....(HTML/ASP)....
<select name="DOMonth" class="rrform" onChange="changedodate('do');">
.......
In .JS file:
function changedodate(pudo)
{
var now = new Date();
var currentyear = now.getYear();
var PUMonth = document.RR.PUMonth;
var PUDay = document.RR.PUDay;
var PUYear = document.RR.PUYear;
var DOMonth = document.RR.DOMonth;
var DODay = document.RR.DODay;
var DOYear = document.RR.DOYear;
if (pudo == "pu")
{
if (!validdate(PUMonth.selectedIndex+1, PUDay.selectedIndex+1))
{
PUMonth.selectedIndex++;
PUDay.selectedIndex = 0;
DOMonth.selectedIndex = PUMonth.selectedIndex;
DODay.selectedIndex = 1;
}
else
{
DOMonth.selectedIndex = PUMonth.selectedIndex;
DODay.selectedIndex = PUDay.selectedIndex+1;
validdodate();
}
}
if (pudo == "do")
{
if (!validdate(DOMonth.selectedIndex+1, DODay.selectedIndex+1))
{
if (DOMonth.selectedIndex+1 == 12)
{
DOMonth.selectedIndex = 0;
DOYear.value = currentyear+1;
}
else
DOMonth.selectedIndex++;
DODay.selectedIndex = 0;
}
}
if (!checkyear(PUMonth.selectedIndex+1))
PUYear.value = currentyear+1;
else
{
if (currentyear < parseInt(PUYear.value))
PUYear.value = currentyear;
}
if (!checkyear(DOMonth.selectedIndex+1))
DOYear.value = currentyear+1;
else
{
if (currentyear < parseInt(DOYear.value))
DOYear.value = currentyear;
}
}
Any ideas?
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