update hidden field in gridview using javascript

I have a gridview which contains a hidden field and a check box. Some of the check boxes will be populated and some not.

Without postback the user will make some changes and click update. when it updates i only want to change the ones that have changed so i have added a hidden field and what i want to do is set the hidden field value to 1 only on those rows where a change is made. I'm thinking this can be done using js but i dont know how?
LBGUC04Asked:
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jagssiduralaConnect With a Mentor Commented:
For example you have one text box and check box


.aspx
------------

<asp:gridview ......

<Columns>
<TemplateField>
<ItemTemplate>
<asp:checkBox onclick="fnUpdateHiddenvalue(this.tag)" tag="hdnUpdate" ...............</asp:checkBox>
<asp:Hiddenfield Id="hdnUpdate" .........../>
</ItemTemplate>
</TemplateField>

<TemplateField>
<ItemTemplate>
<asp:TextBox onblur="fnUpdateHiddenvalue(this.tag)" tag="hdnUpdate" ...............</asp:checkBox>
</ItemTemplate>
</TemplateField>

</Columns>

</asp:Gridview>


Js function
----------------

function fnUpdateHiddenvalue(hdnId)
{
document.getElementById(hdnId).value = "1";
}


Note: tag="hdnUpdate" , Where hdnUpdate is hidden field id, this code may varies if you use any master pages as hiddenfield rendered diffrently like ctl00_Contentplaceholder1_00_hdnUpdate.
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Tyler LaczkoCommented:
document.getElementById("itemID").value  to get your value

document.getElementById("itemID").value = "1";
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P1ST0LPETECommented:
You are right, that you can use JavaScript to do this, and professionalc is also right in how to set the value of a hidden field.  However, I think what you're looking for is a little bit more complicated than what his answer covers.  Can you provide the code for your gridview control, so we can see your actual grid make up and provide you with a better answer?
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