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<asp:literal id="litTodayIs" runat="server" />
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Part 11: Working Directly with Code
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Microsoft Office FrontPage 2003 Inside Out Because this tag contains a runat="server" attribute, ASP.NET loads it as an object each time the page executes. The id= attribute gives the object a name. The slash (/)just before the closing angle bracket (>) takes the place of an </asp:literal> end tag. When ASP.NET sends the page to the visitor, this object supplies the contents of a property named Text. So, if the page contains this statement:
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litTodayIs.Text = Now()
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the Web visitor will receive the current date and time in place of the <asp:literal> tag shown above. The Page_Load event handler is a common place for such a statement, because Page_Load occurs after ASP.NET has loaded all the objects in the page, and before ASP.NET sends any output to the Web visitor. The first few lines in the Web page might therefore be:
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1 2 3 4 5 6 <%@ Page Language="vb" %>
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<script runat="server">
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Sub Page_Load (sender As Object, e As EventArgs)
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litTodayIs.Text = Now() End Sub </script>
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Line 1 is a @ Page directive, which sets compile and run-time options for the page. Lines 2 and 6 mark the limits of a code declaration block (that is, an area that contains executable code). Lines 3 and 5 mark the beginning and end of the Page_Load subroutine, which, by virtue of its name, runs every time the Page_Load event occurs. The sender argument points to the object that raised the event (in this case, the Page object), and the e argument points to an object that contains any special information related to the event (in this case, none). Line 4, of course, does the work. The task of conditionally displaying a New! or an Upd! icon rather than a round bullet is more interesting. Wouldn t it be great to have an HTML tag that displays either of two pic7 tures, based on the interval from some starting date Well, how about a tag like this
<fp11iso:datedImg id=" dimgBaseball" runat="server" src1="ballcyan.gif" src2="new.gif" start="4/4/2003" duration="14" />
The src1 attribute specifies the name of the picture that the tag will normally display. The src2 attribute specifies an alternative picture. The start attribute specifies when to start showing the alternative picture, and the duration attribute specifies the number of days to continue displaying it. As it happens, ASP.NET is great at this sort of thing. The preceding tag is a perfect example. The tag name <fp11iso:datedImg> came from the following statement, which defines an ASP.NET user control:
<%@ Register TagPrefix="fp11iso" TagName="datedImg" Src="datedImg.ascx" %>
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Part 11: Working Directly with Code
Scripting Web Pages on the Server This is a directive that associates the tag prefix and name fp11iso:datedImg with the file datedImg.ascx. (The c in the third position of the file extension denotes control.) At a summary level, the datedImg.ascx file consists of these statements:
<%@ Control Language="vb" %>
<script runat="server">
Public src1 As String = ""
Public src2 As String = ""
Public duration As String = ""
Public start As String = ""
Private Sub Page_Load(sender As Object, e As EventArgs)
' Program code goes here.
End Sub
</script>
<img border="0" src="ballcyan.gif" id="imgPic" runat="server">
The @ Control directive sets options for a user control, just as the @ Page directive sets options for a complete page. The <script runat="server"> and </script> tags create a code declaration block as before. The four public variables src1, src2, duration, and start automat7 ically receive the corresponding attribute values from the tag that loads the control. The <img> tag on the last line is a template for the HTML that the control will create. It has a runat="server" attribute so that ASP.NET will load it as an object and an id= attribute so that code in the Page_Load subroutine can refer to it by name. Program code can read and modify the value of the src attribute by using the expression imgPic.src. Here s the program code that goes inside the Page_Load subroutine:
Dim dteStart As Date Dim intDuration As Integer = 0 Dim strSource As String = "" ' Working copy of start date. ' Working copy of duration. ' Hold area for picture name.
If IsDate(start) Then ' Is start date valid dteStart = CDate(start) ' If so, convert to .NET Date. If IsNumeric(duration) Then ' If duration is valid intDuration = CInt(duration) ' Convert to .NET Integer, Else ' Otherwise intDuration = 14 ' Default to 14. End If ' Get difference between ' start date and today's date. Select Case DateDiff(DateInterval.Day, dteStart, Now.Date) Case < 0 ' If negative, use src1 strSource = src1 ' use src1, Case < intDuration ' If 0 through duration strSource = src2 ' use src2, Case Else ' Otherwise strSource = src1 ' use src1. End Select Else ' If start date is invalid strSource = src1 ' use src1. End If
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