The Javascript return and new line escapes \r\n or even \n alone have worked for me. If they are causing a new line to appear in the page source instead make sure that you are not missing a single or double quote if you are building the confirmation string in code.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
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Mike,

Knowing that using the \r\n return and line-feed escapes had once worked (a long time ago) for me, I had to do a quick test in a module I'm working on which also uses the ClientAPI.AddButtonConfirm method. It failed in the same manner you indicated. I then took a look at the ClientAPI code (http://dnnclientapi.codeplex.com) and found that a modification had been made (not recently) such that the ClientAPI.GetSafeJSString now escapes the backslash character as well as single and double quote characters thus preventing \r or \n from being recognized as return and line-feed characters. Unfortunately I don't see any way of passing a string containing any character escape to the AddButtonConfirm method. The simplest solution would be to add the Javascript confirm call to the button control's onClick attribute:

btnDelete.Attributes.Add("onClick", " return confirm('" & confirmText & "');")

or

btnDelete.OnClientClick=" return confirm('" & confirmText & "');"

In looking for the ClientAPI source in the DotNetNuke source (before remembering that it is now available only on CodePlex), I came across a new method in the DotNetNuke.Web.UI namespace that would seem useful for this and makes use of the new DNNWindowManager available in DNN 5.x:

Public Shared Function GetOnClientClickConfirm(ByRef ctrl As Control, ByVal message As String) As String

I would presume (but have not tried it) that it would be called as follows:

btnDelete.OnClientClick=DotNetNuke.Web.UI.GetOnClientClickConfirm(btnDelete, confirmText)

The GetOnClientClickConfirm method escapes only the single and double quotes not any '\' character in the message.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner