使用可扩展标志语言(XML)编写的脚本和组件和.XML被用来定义对象,方法,属性等等。
同时脚本还提供函数。脚本语言可以是javascript, vbscript等等。运用在网站的运用程序和网站的普通例子,现在都可以被转换成scriptlets. 只要使用scriptlets 来写组件,他们可以再被从新使用在网站或则运用程序各部分,既可以使用在服务端(例如ASP代码)也能够被使用在客户端(例如浏览器)。
这里将集中讨论服务端的用来组件ASP代码的Scriptlets。
早些时候,ASP开发者习惯写include文件。用来做公共的服务端例行程序,
还用在他们的网站运用程序中。从功能上说,include文件被局限在仅仅是在页面中引用。
完成传递参数的功能。
现在同样的公共例行程序能够中添加了scriptlet方法和并且有助与在运用程序中使用组件。
这个方法现在非常普遍的运用在网站运用程序中,能够被运行在同一个服务器上的运用程序重用。
这个方法使得从数据库中获取(pull-down)数据将变得非常通俗化。
例子:建立scriptlet方法和属性,使得很通俗的从数据库中获取数据。
并且使得运行在同一个服务器上所有的运用程序使用这个同样的scriptlet,而不用重新写代码了。
代码如下:
scriptlet文件名为scp_query2list.sct
<?XML version="1.0"?>
<scriptlet>
<registration
description="scp_query2list"
progid="scpquery2list.Scriptlet"
version="1.00"
classid="{e32d2a70-4e11-11d3-a9f0-0080c8034244}"
>
</registration>
<public>
<method name="query2list">
<PARAMETER name="objConn"/>
<PARAMETER name="query"/>
</method>
</public>
<implements type="ASP" id="ASP"/>
<script language="VBScript">
<![CDATA][
Sub query2list(objConn, query)
Dim objRs
Set objRs = objConn.Execute(query)
If objRs.EOF AND objRs.BOF Then
Response.write "<option value='none'>没有找到记录。</option>"
Else
Do While Not objRs.EOF
Response.write "<option value='" & objRS(0) & "'>" & objRs(0) & "</option>"
objRs.MoveNext
Loop
End If
objRS.Close
Set objRS = nothing
End Sub
]]>
</script>
</scriptlet>
其中在scriptlets中使用的各种元素的具体说明可以在http://msdn.microsoft.com/scripting处找到。
下面是怎么具体调用scriptlets的代码:(只要是在同一个服务器上注册了scriptlets的运用程序,都可以使用这段代码)
query2list.asp 文件:
<%@ Language=VBScript %>
<%
Option Explicit
Dim objConn
Dim dbPath
Dim sql
Dim objScpQuery2list
Set objConn = Server.CreateObject ("ADODB.Connection")
dbPath="DBQ=" & Server.MapPath("techpapers_test.mdb")
objConn.Open "DRIVER={Microsoft Access Driver (*.mdb)}; " & dbPath
'--- query required for pull down
sql = "select AuthorFirst from Papers"
Set objScpQuery2list = Server.CreateObject ("scpquery2list.Scriptlet")
%>
<html>
<body>
<center>
<form name = "fr1">
<select>
<option value="none" selected>选择发行人</option>
<% call objScpQuery2list.query2list(objConn, sql) %>
</select>
</form>
</center>
</body>
</html>
<%
objConn.Close
Set objConn = nothing
Set objScpQuery2list = nothing
%>
出现的问题:
第一次使用scriptlets有可能会出现这样的问题,就是内存浪费现象,改进方法如下:
将ASP对象传递给scriptlets,而代替使用ASP接口。(就是不使用<implements type="ASP" id="ASP"/>申明)
testscp.sct:
<?XML version="1.0"?>
<scriptlet>
<?scriptlet error="true" debug="true"?>
<registration
description="testscp"
progid="testscp.Scriptlet"
version="1.00"
classid="{78a33aa0-335d-11d3-a9a9-0080c8034244}"
>
</registration>
<public>
<property name="cnnState">
<get/>
</property>
<method name="TestWrite">
<parameter name="sHTML"/>
</method>
<method name="TestWriteLine">
<parameter name="sHTML"/>
</method>
<method name="ASPConnect">
<parameter name="oServer"/>
<parameter name="oApplication"/>
<parameter name="oSession"/>
<parameter name="oRequest"/>
<parameter name="oResponse"/>
</method>
</public>
<script language="VBScript">
<![CDATA][
Private cnnState, Server, Application, Session, Request, Response
cnnState = False
Function get_cnnState()
get_cnnState = cnnState
End Function
Sub ASPConnect(oServer, oApplication, oSession, oRequest, oResponse)
Set Server = oServer
Set Application = oApplication
Set Session = oSession
Set Request = oRequest
Set Response = oResponse
cnnState = True
End Sub
Sub TestWrite(sHTML)
Response.Write sHTML
End Sub
Sub TestWriteLine(sHTML)
Response.Write sHTML & "<BR>"
End Sub
]]>
</script>
</scriptlet>
传递ASP对象的ASP程序如下:
testscp.asp代码
<%
Set scrip=Server.CreateObject("testscp.Scriptlet")
if Err then
Response.Write "<BR>Error:" & Err.Number
Response.Write "<BR>" & Err.Description
Response.Write "<BR>" & Err.Source
Response.End
End If
Response.Write "<BR> cnnState=" & scrip.cnnState
if Err then
Response.Write "<BR>Error:" & Err.Number
Response.Write "<BR>" & Err.Description
Response.Write "<BR>" & Err.Source
Response.End
End If
Response.Write "<BR>Connecting..."
scrip.ASPConnect Server, Application, Session, Request, Response
if Err then
Response.Write "<BR>Error" & Err.Number
Response.Write "<BR>" & Err.Description
Response.Write "<BR>" & Err.Source
Response.End
End If
Response.Write "<BR>cnnState=" & scrip.cnnState & "<BR>"
Response.Write "<BR>Testing ...Write<BR>"
scrip.TestWriteLine ""
scrip.TestWrite "This is the first part "
scrip.TestWrite "and this is the second."
Response.Write "<BR>Testing ...WriteLine<BR>"
scrip.TestWriteLine "This is text with a line break."
scrip.TestWriteLine "And so is this."
%>
上面的代码没有包括<implement type = "ASP"/>, 但是仍然可以访问ASP对象。
因为他们是被当成对象传递给scriptlet.
下面再给出一个很常用的取时间的狸子:
scp_dmy.sct
<?XML version="1.0"?>
<scriptlet>
<?scriptlet error="true" debug="true"?>
<registration
description="scp_dmy"
progid="scpdmy.Scriptlet"
version="1.00"
classid="{bba68a50-3ae0-11d3-a9c0-0080c8034244}"
>
</registration>
<public>
<method name = "option_num">
<PARAMETER name = "num"/>
</method>
<method name = "option_month">
</method>
<method name = "option_year">
</method>
</public>
<implements type="ASP" id="ASP"/>
<script language="VBScript">
<![CDATA][
Sub option_num(num)
For i = 1 to num
If i<10 Then
x = 0 & i
Else
x = i
End If
Response.write "<option value = " & x & ">" & x & "</option>"
Next
End Sub
Sub option_month()
For i = 1 to 12
If i<10 Then
x = 0 & i
Else
x = i
End If
Response.write "<option value = " & x & ">" & MonthName(x,True) & "</option>"
Next
End Sub
Sub option_year()
For i = -1 To 3
yy = year(DateAdd("yyyy",i,Dat