Great New Advanced Article on ASP.NET 2.0 Master Pages

master pages

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re: Great New Advanced Article on ASP.NET 2.0 Master Pages

Christopher Schick — Sun, 18 Mar 2007 07:08:10 GMT

I use a technique similar to Forrrest's.

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

If Not Page.IsPostBack Then

Dim script As String

Dim paths() As String = {Page.MapPath("~/javascript/my.js")}

Dim content As ContentPlaceHolder = DirectCast(Page.Form.FindControl("ContentPlaceHolder1"), ContentPlaceHolder)

script = GetValidJavaScript(content.Controls, paths, False)

ScriptManager.RegisterStartupScript(Me.Page, Me.GetType(), "MyKey", script, True)

End If

End Sub

' Loops through a control collection using recursion.

' Returns the javascript file with correct client control ids.

' To use this function, use the server side control ids in the javascript file.

' i.e. document.getElementById('serverControlId') or $('serverControlId')

Public Function GetValidJavaScript(ByVal _parent As Object, ByVal paths() As String, Optional ByVal optimize As Boolean = True) As String

Dim sb As StringBuilder = New StringBuilder()

Dim tr As TextReader

Dim idx As Integer = 0

Try

For idx = 0 To paths.GetUpperBound(0)

tr = New StreamReader(paths(idx))

If Not sb Is Nothing Then

sb.Append(tr.ReadToEnd())

Else

sb.Append(Environment.NewLine + tr.ReadToEnd())

End If

tr.Close()

IterateThroughControls(_parent, sb, optimize)

Catch ex As Exception

Return ex.ToString() + Environment.NewLine + ex.InnerException.ToString()

End Try

Return sb.ToString()

End Function

Private Function IterateThroughControls(ByVal _myParent As ControlCollection, ByVal sb As StringBuilder, ByVal optimize As Boolean) As String

Dim ctrl As Control

Try

For Each ctrl In _myParent

If Not String.IsNullOrEmpty(ctrl.ID) And Not String.IsNullOrEmpty(ctrl.ClientID) Then

sb.Replace("'" + ctrl.ID + "'", "'" + ctrl.ClientID + "'")

If ctrl.Controls.Count > 0 Then

IterateThroughControls(ctrl.Controls, sb, optimize)

End If

Catch ex As Exception

Return "Recursion Error: " + ex.ToString() + Environment.NewLine + ex.InnerException.ToString()

End Try

' If optimize Then

' Dim strResult As String

' = OptimizeScript(sb.ToString())

' Return strResult

' End If

Return sb.ToString()

End Function

re: Great New Advanced Article on ASP.NET 2.0 Master Pages

Khan — Thu, 15 Mar 2007 18:12:16 GMT

I have a calendar popup used at many a places in in my application. when i popup the calendar from a webpage which is inherited from masterpage it wont populate the textbox with date back.... can anyone help me out... same code works for a webpage which is not inherited from masterpage.

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re: Great New Advanced Article on ASP.NET 2.0 Master Pages

John King — Mon, 16 Oct 2006 14:16:40 GMT

Hi: I now have Forrest's idea incorporated into my app and it works great. The trick now is to insert the related javascript functions into the head section of the document without embedding them into the master page. I'll try using the contentplaceholder method in the head of the master page. I'm sure it will work. I'm still interested in the questions I posed in the previous post. Thanks, John

re: Great New Advanced Article on ASP.NET 2.0 Master Pages

John King — Sun, 15 Oct 2006 16:46:53 GMT

Hi: The code provided by Eric Eubank and Forrest looks very useful. I have to admit that understand of Forrest's version much better than I understand Eric's. My main difficulty with Eric's is that I don't understand where to use it. In the case of layered Master Pages, where should this code be placed? In the following snippet: (ContentPlaceHolder)Page.Master.FindControl("phContent"); I'm assuming that the argument "phContent" is the id of the ContentPlaceHolder in the Master page that contains control in which you are interested. Is that correct. As for Forrest's version, I applied it in the content page. To help me understand it, I modified the string to add "
" and then wrote the result to the page so I could see the results. (I haven't been successful using this technique with Eric's code, but that may be the result of my misusing it.) It did what I thought it would do, but my question is how to apply this? By running this, are they set as Javascript global variables so that I can access them whenever I need to in whichever function references them? I'm trying to work out simple test cases, but so far I haven't been successful. My application, right now, is primarily for custom form validation comparing an email address with a confirm email address value while using master pages. the text box controls are on the content page. Obviously, name mangling makes this a cumbersome task at best. hardcoding the mangled names results in what I want, but obviously that is not what I want to to. A couple of other questions: Is there an advantage to doing this for ALL controls in a page, or should I modify this to get the individual control or controls in which I am interested? I can see it both ways. Why walk the entire structure multiple times when you can do it once. Or is it better to simply get what you need when you need it and not keep a bunch of essentially unneeded information around? Thanks for the contribution to this thread. It has given me something to think about. John

re: Great New Advanced Article on ASP.NET 2.0 Master Pages

ScottGu — Sat, 14 Oct 2006 14:36:44 GMT

Hi Chris,

You can use class names instead of IDs to name CSS rules. I actually recommend these since they allow you to use them with multiple elements across a site, and also work fine regardless of how deep a control is nested.

Hope this helps,

Scott

re: Great New Advanced Article on ASP.NET 2.0 Master Pages

DK — Sat, 14 Oct 2006 02:40:54 GMT

I am passing the following script to a calendar popup. My intention is to set the selected text to a textbox on a content page. The script changes the bgcolor but it doesn't set the date and also calendar form doesn't close. ""

re: Great New Advanced Article on ASP.NET 2.0 Master Pages

Chris — Fri, 13 Oct 2006 19:49:26 GMT

"Note that ID values are deterministic - so you will get consistent controlID names at runtime." Very true. But, isn't that deterministic name based on control depth and order? The minute those change, the ids are changed, and your CSS is hosed. And from a practical standpoint, deterministic still doesn't mean 'sensical for a designer not involved in the programming the project'... As far as always using classes...that isn't always possible either. Sometimes you need to work around CSS specificity issues where thing need to be applied to a moer specific #id rather than .class. I'll always be the official bad guy broken record that proclaims master pages and control id futzing bad for separation of code from content.

re: Great New Advanced Article on ASP.NET 2.0 Master Pages

Bohemian — Thu, 12 Oct 2006 12:33:38 GMT

I have a masterpage that I am working on with multiple menus and I want to be able to find the ID at runtime, so I can perform some other action, when that particular menu is in use. Server side how do I get a list of the menu id's at runtime in C# ? Is there some foreach construct and collection I can enumerate within a masterpage class to obtain all the menu id's ? Thanks in advance.