Web Forms :: Anomaly When Dynamically Adding/deleting Controls?
Mar 15, 2010
I have a page where a user can add any number of a specific custom control by clicking a button and delete any of them by checking a "delete" box and clicking the delete button. This custom control has a dropdown, 3 radiobuttons, 2 text boxes and 2 checkboxes. The anomaly occurs when you add at least 2 controls, then delete any of them but the last one.
When each control is rendered the name and id attributes are autoincremented to make them unique however, in the above casewhen the custom control is actually renedered to the page the name attribute has an index that is 1 higher than the id. For example:
here is the name and id of the problem radio button: name = ctl00$ContentPlaceHolder1$PreOpUpdatePanel$PreOpStatcompareinout1$AllInOut but the id = ctl00_ContentPlaceHolder1_PreOpUpdatePanel_PreOpStatcompareinout0_All
Now I am sure that I am doing somethign wrong but I just do not know what. Since the controls are added dynamically I have to recreate them on each postback so that the postback data can repop the fields. However, when the user deletes then the postback event makes me recreate all of them, then I have to remove the controls the user requested to be deleted. At this point the auto generated index is incorrect so the nextpostback will lose the data so I have to manually renumber the control IDs. Now this seems to work on all other controls within my custom control except for the radio buttons.
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