asked on

In HTML, how do I trigger a Postback after a ComboBox value is updated?

Please Help!!!

I have a page with a ComboBox.
I want to trigger a Postback when the ComboBox is updated.

Am I on the right track with the following code?

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 <Script> 
function ComboChange(obj) {
var comboValue = document.getElementById('MktReportSelectDate').value;
__doPostBack('MktReportSelectDate', comboValue);}
</Script> 


<TR>
   <TD  ALIGN="RIGHT">Reporting Period:&nbsp;&nbsp;</TD>
   <TD  ALIGN="LEFT"><SELECT NAME="MktReportSelectDate" ID="MktReportSelectDate" OnChange="ComboChange()" >
<OPTION VALUE="Custom Date Period" SELECTED>Custom Date Period
<OPTION VALUE="First Quarter">First Quarter
<OPTION VALUE="Second Quarter">Second Quarter
<OPTION VALUE="Third Quarter">Third Quarter
<OPTION VALUE="Fourth Quarter">Fourth Quarter
<OPTION VALUE="This Year">This Year
<OPTION VALUE="Last Year">Last Year
<OPTION VALUE="This Month">This Month
<OPTION VALUE="Last Month">Last Month
</SELECT>
</TD>

</TR>

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The ComboBox is displayed properly. But the Postback is not triggered when a new value is selected.

I am new to HTML and have a project that I need to complete ASAP. Any help would be greatly appreciated.

Many Thanks,

Nelson

ASKER CERTIFIED SOLUTION

ste5an

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Leonidas Dosas

What is the error in your console? Check the __doPostBack function scope .

Nelson3000

ASKER

Thanks very much ste5an. Your solution worked perfectly.

Your assessment of what I was trying to accomplish was spot-on and your redesigned function was exactly what I needed.

For future reference, I will make sure to follow your recommendation about how to properly include code fragments in my questions.

Thanks again for the excellent solution and the HTML lesson.