troubleshooting Question

How to access dynamically added listbox item/value on postback

Avatar of ggd4865
ggd4865 asked on
6 Comments1 Solution670 ViewsLast Modified:

I have a listbox.  Items are added to the listbox on the client side via javascript.

Before the form is submitted, all the listbox items are selected.

What is the best way to access the dynamically added items on the server side?

I have no problem accessing items that were previously added on the server side.  They show up as ListIems in the SelectedIndexChanged event.  The dynamically added items do not.

One way I have found is to loop through a NameValueCollection searching for the appropriate key value, e.g. "Box1", and then get the values.

For example, in Page_Load:

NameValueCollection coll1 = Request.Form;
String[] arr1 = coll1.AllKeys;

for (loop1 = 0; loop1<arr1.Length; loop1++)
    if (arr1[loop1] == "box1")  //is this the key I'm looking for?

        String[] arr2 = coll1.GetValues(arr1[loop1]);        // Get all values under this key.

        for (loop2 = 0; loop2 < arr2.Length; loop2++)

This works, but isn't there something more straightforward?  Is there anyway to access Box1 items more directly?

I am new to ASP.NET and have no idea what I am doing.  I hope this means easy points for someone.

Thank you!


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