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                  發表時間：2024-02-18             來源：明輝站整理相關軟件相關文章人氣：          
              
      [摘要]源程序下載在本站的源程序欄的html一代類型里，名為隱藏窗體的應用例子 Using hidden forms to transfer data from client side to Server side and vice-versa Author: Sudhakar M Level of Di...

                              源程序下載在本站的源程序欄的html一代類型里，名為隱藏窗體的應用例子 

      Using hidden forms to transfer data from client side to Server side and vice-versa 

      Author: Sudhakar M 
      Level of Difficulty: Beginner 
      Languages covered: ASP, JavaScript 
      Pre-required reading: None 
      Date: Apr 19, 2000 


      Introduction 

      This paper discusses how to use hidden forms to transfer data from client side to server-side and vice- 
      versa. This approach is needed when you have an ASP application, with the individual pages dealing with 
      only a part of the whole data involved, but at a later time, such as exiting the application, all of the 
      data entered intermediately so far is needed. 

      One obvious approach is to use Session variables. Session variables need cookies to be enabled to work. 
      But what if cookies are disabled? Also in today's e-commerce applications there are scenarios where random 
      servers service the browser requests depending on the load (load-balanced), so there is no session 
      involved. This is an alternative approach to session variables and cookies. 

      The Approach 

      I will discuss the approach by a simple example. Suppose I have an ASP application with three pages 
      Name.asp, Address.asp, database.asp. The user navigates from one page to another page entering the 
      information along the way in the first two pages. Also after the information is entered in each particular 
      page, the server side needs the information, to make some decisions, like to pull some more data out of a 
      database based on the entered values and send it to the next page. This process continues until the user 
      reaches the last page, when all of the previous data is committed to the database. The trickiest part is 
      the information entered in any of the intermediate pages and information deduced from the server side 
      after submitting a page will be needed anywhere in the subsequent pages and moreover all of the 
      information will be needed in the last page. 

      The following, Hidden.inc, include file declares the server side variables for all the state involved, a 
      helper function that will be used every time at the beginning of a page on the server side: 


      Var FirstName=""; 
      Var LastName=""; 
      Var Address=""; 

      // The following SaveState() function will retrieve 
      // the submitted state from the hidden frame on any given page 

      Function SaveState() 
      { 
      FirstName = ""; 
      FirstName = Request.Form("FirstName").Item; 

      LastName = ""; 
      LastName = Request.Form("LastName").Item; 

      Address = ""; 
      Address = Request.Form("Address").Item; 

      } 


      This include file will be included in every page on the server side. 

      The following is a typical client side include file, Formstate.inc, containing the hidden form, which will 
      have all the fields involved in the application: 


      <FORM NAME="FormState"> 
      <INPUT TYPE=HIDDEN NAME=FirstName> 
      <INPUT TYPE=HIDDEN NAME=LastName> 
      <INPUT TYPE=HIDDEN NAME=Address> 
      </FORM> 


      Now lets move on to the actual ASP pages where the interesting action happens. This is how Name.Asp might 
      look: 


      <%@ Language=JavaScript %> 

      <html><head><title>Name </title> 
      <!-- #include file = "Helper.inc" --> 

      <% 
      SaveState(); 
      //Bunch of other server side stuff. 
      %> 

      <!-- //client side ? 
      <script LANGUAGE="javascript"> 
      <!- 

      function SubmitHiddenForm(page) 
      { 
      var State = document.FormState; 

      // if the value is not modified in this page you inline it from the 
      // value what you got from the server side like below 
      State.FirstName.value = "<%=FirstName%>"; 

      //Otherwise probably pull it out from the client side form and put it 
      // here 
      State.LastName.value = document. formName.LastName.Value; 

      //Assuming the following will not change in this page the rest of them 
      // are stored in the client side hidden frame as follows 
      State.City.value = "<%=City%>"; 


      State.action = page; 
      State.submit(); 
      } 

      function doNext() 
      { 
      SubmitHiddenForm("NextPage.asp"); 
      } 

      ? 
      </script> 

      <body> 

      <form NAME="formGetName" METHOD="POST"> 
      <input TYPE="EDIT" NAME="LastName" > 

      <!-The button? 
      <a HREF="javascript:doNext();"> 
      <img NAME="Next" src="http://www.okasp.com/techinfo/nextbutton.gif"></a> 
      </form> 

      <!-Inline the hidden form here? 
      <!-- #include file = "FormState.inc" --> 

      </body> 


      The key is, as you might have understood is to first generate a function that will hold all the values got 
      from the server side (like in the above for FirstName). If a particular variable is going to get it's 
      value from this page then instead of initializing it from the server side variable, read it from the 
      client side form variable or whatever (like the above for LastName). 

      Then in response to submission we have to call SubmitHiddenForm() function which effectively posts all the 
      data to the server side and the server side again in that page generates a similar page, which will save 
      all the data in the client side variables of that current page. This process continues on to the last page 
      where probably on the server side we use all the collected information and persist to a database. （出處：熱點網絡）


              
              
                 
              
                                            
                              		       
                          
                           		  
        
                            
      
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