在客户端执行数据库记录的分页显示----2

创建一个分页类

　　要记住，这里举例的整个应用程序只包括一个ASP页面。当这个ASP页面被访问时，它将创建执行记录分页需要的所有客户端JavaScript代码。为简化这个过程，我创建了一个VBScript类来处理这个功能。使用这个类的时候，开发人员只需将他希望在访问者的Web浏览器上进行分页的记录集传递进来即可。关于类的使用，请阅读在VBScript中使用类。

　　我将这个类命名为dhtmlGetRows，它包含两个属性和一个方法。两个属性是：

　　1、 RecsPerPage：确定每一页显示多少个记录。

　　2、 THString：通过一个HTML表格显示这个进行了分页的结果；这个属性允许你为表格的标题指定一个字串。

　　单一的方法是GenerateHTML(RecordsetObject)，它为分页应用程序返回完整的HTML：客户端JavaScript代码和需要的DIV 标记。这个方法只需要一个参数RecordsetObject，它应该是一个记录集对象，其中填充了你希望在一个分页格式中显示的数据库数据。

　　这个类的代码相当长，并且大部分代码都只是返回客户端的JavaScript代码。下面是类的代码：

＜%
Class dhtmlGetRows

‘’******* PRIVATE MEMBER VARIABLES **********
Private iRecsPerPage
Private strTHString
‘’*******************************************

‘’************ Initialize Event *************
Private Sub Class_Initialize()
iRecsPerPage = 10 ‘’assign a default value
End Sub
‘’*******************************************


‘’************ PROPERTY LET/GET *************
Public Property Let THString(strValue)
‘’Replace all apostrophes with \‘’
strTHString = Replace(strValue, "‘’", "\‘’")
End Property

Public Property Get THString()
THString = strTHString
End Property


Public Property Let RecsPerPage(iValue)
If iValue ＞ 0 and IsNumeric(iValue) then
iRecsPerPage = CInt(iValue)
End If
End Property

Public Property Get RecsPerPage()
RecsPerPage = iRecsPerPage
End Property
‘’*******************************************


‘’**************** METHODS ******************
Public Function GenerateHTML(objRS)

‘’Begin by getting an array of the data
Dim aValues
aValues = objRS.GetRows()

‘’Find the value of rows and columns
Dim iCols, iRows
iCols = UBound(aValues, 1)
iRows = UBound(aValues, 2)

Dim strOutput
‘’Display the initial script block
strOutput = "＜script language=""javascript""＞" & vbCrLf & _
"var tableRow = new Array(" & iRows & ");" & vbCrLf & vbCrLf

Dim iLoop, iColLoop, strTmp
For iLoop = 0 to iRows
strOutput = strOutput & "tableRow[" & iLoop & "] = ‘’＜tr＞"

For iColLoop = 0 to iCols
‘’Fix apostrophes
strTmp = Replace(aValues(iColLoop, iLoop),"‘’", "\‘’")

‘’Remove carraige returns
strTmp = Replace(strTmp, vbCrLf, "")

strOutput = strOutput & "＜td＞" & strTmp & "＜/td＞"
Next ‘’iColLoop

strOutput = strOutput & "＜/tr＞‘’;" & vbCrLf
Next ‘’iLoop

‘’Init global varaibles and find out what browser the user is using
strOutput = strOutput & vbCrLf & vbCrLf & "var first = 0;" & vbCrLf & _
"var last = " & iRecsPerPage & ";" & vbCrLf & _
"var mynav;" & vbCrLf & "if (navigator.appName == ""Netscape"")" & _
vbCrLf & vbTab & "mynav = ""NS"";" & vbCrLf & _
"if (navigator.appName == ""Microsoft Internet Explorer"")" & _
vbCrLf & vbTab & "mynav = ""IE"";" & vbCrLf & _
vbCrLf & "＜/script＞" & vbCrLf & vbCrLf

‘’Now display the HTML table
strOutput = strOutput & vbCrLf & "＜div id=""grid""＞ ＜/div＞" & vbCrLf & _
vbCrLf & vbCrLf & "＜script language=""javascript""＞" & vbCrLf


‘’Write the nav function
strOutput = strOutput & "function nav(iVal) {" & vbCrLf & _
"// do we want to move forward or backwards?" & vbCrLf & _
"if (iVal == 1) { " & vbCrLf & vbTab & "first += " & _
iRecsPerPage & ";" & vbCrLf & "last += " & iRecsPerPage & _
vbCrLf & "}" & vbCrLf & "else if (iVal == -1) { " & vbCrLf & vbTab & _
"first -= " & iRecsPerPage & ";" & vbCrLf & vbTab & "last -= " & _
iRecsPerPage & ";" & vbCrLf & "}" & vbCrLf & _
vbCrLf & vbCrLf & "var txt = ‘’‘’;" & vbCrLf & _
"txt += ‘’＜table border=""1""＞‘’;" & vbCrLf

‘’Do we need to add a TH string?
If Len(strTHString) ＞ 0 then
strOutput = strOutput & "txt += ‘’＜tr＞" & strTHString & "＜/tr＞‘’;" & vbCrLf
End If

strOutput = strOutput & "for (var iLoop = first; iLoop ＜ last; iLoop++)" & vbCrLf & _
vbTab & "if (iLoop ＜= " & iRows & ") txt += tableRow[iLoop];" & vbCrLf & _
"txt += ‘’＜/table＞‘’;" & vbCrLf & vbCrLf

‘’Now, show next/prev links if applicable
strOutput = strOutput & "if (first ＞ 0) // show prev link" & vbCrLf & _
vbTab & "txt += ‘’＜a href=""javascript:nav(-1);""＞Prev " & _
iRecsPerPage & "＜/a＞ ‘’;" & vbCrLf & vbCrLf & _
"if (last ＜= " & iRows & ") // show next link" & vbCrLf & vbTab & _
"txt += ‘’＜a href=""javascript:nav(1);""＞Next " & _
iRecsPerPage & "＜/a＞‘’;" & vbCrLf & vbCrLf

‘’Write out the new HTML content to the DIV tag
strOutput = strOutput & "// write out the the DIV tag depending on browser..." & vbCrLf & _
"if (mynav == ""NS"") {" & vbCrLf & vbTab & _
"document.layers[‘’grid‘’].document.write(txt);" & vbCrLf & vbTab & _
"document.close();" & vbCrLf & "}" & vbCrLf & vbCrLf & _
"if (mynav == ""IE"")" & vbCrLf & vbTab & _
"document.all[‘’grid‘’].innerHTML = txt;" & vbCrLf & vbCrLf & _
"}" & vbCrLf & vbCrLf

strOutput = strOutput & "nav(0);" & vbCrLf & "＜/script＞"

GenerateHTML = strOutput
End Function
‘’*******************************************
End Class

%＞

原文转自：http://www.ltesting.net