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08.26.2008 at 01:19PM PDT, ID: 23679956
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9.0

Create dynamic hidden control update with javascript passback on posback.

Asked by o0JoeCool0o1 in Microsoft Visual C#.Net, Programming for ASP.NET

Tags:

Ok so I have a datagrid that on each row databound creates a dynamic hidden control with

if (!Page.IsPostBack)
            {
                System.Web.UI.HtmlControls.HtmlInputHidden inpHidden =
                    new System.Web.UI.HtmlControls.HtmlInputHidden();
                inpHidden.ID = "hfMentorMatchSlideValue" + (e.Item.ItemIndex + 1);
                Page.Form.Controls.Add(inpHidden);
            }
So I can see the controls are being added, now I update the value using javascript

 document.getElementById("ctl00_hfMentorMatchSlideValue" + callingBox).value = ans[sender.get_value()];

So essentially the user can update this field by dragging a client side slider control on the page and it updates the hidden field. Now I need to retrieve the value of the hidden boxes on postback and save there values ot database.
I get Null reference when I try accessing the hidden values with Page.FindControl("hfMentorMatchSlideValue1")
I get nul lreference with "ctl00_hfMentorMatchSlideValue1" ( which I see in the source)
I also get null reference tryign to use REquest.Froms and both of those... how do I get the value now?

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About this solution

Zones: Microsoft Visual C#.Net, Programming for ASP.NET
Tags: ASP.NET CSharp.NET
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Solution Provided By: jcoehoorn
Participating Experts: 2
Solution Grade: A
 
 
 
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