This job mainly consists of four sub-accountsProgramComponents, in a relatively simple application, you just needCodePut in the contained file directly
For more complex environmentsArticleFinally, we provide some suggestions for improvement.
I. Basic Work Process
Next we will discuss these four subprograms in sequence.
(1) initialization
Here we need to save two variables in the session object, where:
(1) Each form corresponds to a unique identifier called FID. A counter is used to make the value unique.
(2) Each time a form is successfully submitted, its FID must be stored in a dictionary object.
We use a dedicated process to initialize the above data. Although each subroutine will call it in the future
During this period, it only runs once:
(2) Unique Identifier of the generated form
The following function generatefid () is used to generate the unique identifier of a form. This function first adds the FID value to 1 and then returns it:Copy codeThe Code is as follows: function generatefid ()
Initializefid
Session ("FID") = SESSION ("FID") + 1
Generatefid = SESSION ("FID ")
End Function
(3) registration submitted forms
When the form is successfully submitted, register its unique identifier in the dictionary object:Copy codeThe Code is as follows: Sub registerfid ()
Dim strfid
Initializefid
Strfid = request ("FID ")
Session ("fidlist"). Add strfid, now ()
End sub
(4) check whether the form is submitted repeatedly
Before formally processing a form submitted by a user, check whether its FID has been registered in the dictionary object. The following
The checkfid () function is used to complete this task. If it has been registered, false is returned; otherwise, true is returned:
Ii. How to Use
The preceding functions are used in two aspects: form generation and result processing. Assume that the preceding four subprograms are included in
In forms. Inc, the following code determines whether to generate a form or process the form result based on the FID value.
For most ASP applications:Copy codeThe Code is as follows: <% option explicit %>
<! -- # Include file = "forms. Inc" -->
<HTML>
<Head>
<Title> test form submission </title>
</Head
<Body>
<%
If request ("FID") = "" then
Generateform
Else
Processform
End if
%>
</Body>
</Html>
Generateform is used to generate a form. The form should contain a hidden FID, for example:
Copy code The Code is as follows: <%
Processform is responsible for processing the content submitted through the form, but before processing, you should call checkfid () to check whether the current form has been
After submission, the Code class is as follows:
<%
Sub processform ()
If checkfid () then
Response. Write "your input is" & request. querystring ("param1 ")
Registerfid
Else
Response. Write "this form can only be submitted once! "
End if
End sub
%>
Iii. Restrictions and Improvement Measures
The preceding describes how to restrict multiple submissions of the same form during the current session. In practical applications, you may need
Improvements in multiple aspects, such:
(1) check the validity of the user input data before the Registration Form ID. If the data is invalid, you can press the "back" button.
Return. Submit the same form again after correction.
(2) This restriction on Form submission can only be valid during the current session. If this restriction is required to span multiple sessions
So you need to use cookeis or database to save the relevant data.
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