Interactive use of JSP data and JavaScript data

For WEB programs, front-end JavaScript) and back-end JSP/Servlet can not share data, only the back-end program JSP) to output data, generate pages to the front-end, at this time, the JavaScript code in the generated page may obtain the so-called JSP data. Similarly, JavaScript data can be obtained in JSP programs only when JavaScript data is submitted to the backend JSP code.

So how can we use JSP data in page JavaScript or page JavaScript data in JSP?

I. How to submit JavaScript data on the page to the JSP program in the background

1. JavaScript data can be stored in xxx. JSP? Var1 = aaa & var2 = bbb is used as URL parameters to pass to the JSP program.

 
 

  
  
<%String strVar1=request.getParameter("var1");%> 
 
 

The data transmitted by the JavaScript script can be obtained;

2. Use JavaScript to add hidden domain information to the form, and then pass the data to the JSP program by submitting the form.

Refer to the following script:

 
 

  
  
<Script Language="JavaScript">
  
  
<! --
  
  
JavaScript script, which can be placed anywhere on the page
  
  
The insertclick () function gets the variable varMC passed to the page by JSP,
  
  
Then you can modify the value of this variable in JavaScript, and then use
  
  
The post method is submitted to the JSP program for use.
  
  
Function insertclick (){
  
  
Var1=Document. All. mc. value; // get the variable value in form.
  
  
Var1Var1= Var1 + "name ";
  
  
Document. insertForm. submit ();
  
  
}
  
  
//-->
  
  
</Script>
  
  
 
  
  
<! -- Html page form, which is placed on an html page without any restrictions -->
  
  
<Form Name="InsertForm" Method="Post" Action="YourJSP">
  
  
<! -- The following sentence gets the variable value passed in the JSP program -->
  
  
<Input Type="Hidden" Name="Mc" Value="<% = VarMC %>">
  
  
<Input Type="Button" Value="Submit" Onclick="Insertclick ()">
  
  
</Form> 
 
 

Ii. How to use JSP data in the background for JavaScript data on the page

This is relatively simple. You can directly use <% = strVar1 %> In the JavaScript script to pass the data in the JSP program to the JavaScript script.

Refer to the following script:

 
 

  
  
<! -- Html page form, which is placed on an html page without any restrictions -->
  
  
<Form Name="InsertForm" Method="Post" Action="YourJSP">
  
  
<Input Type="Hidden" Name="Mc" Value="">
  
  
</Form>
  
  
 
  
  
<Script Language="JavaScript">
  
  
<! --
  
  
JavaScript script, which can be placed anywhere after form in the page
  
  
Use cirpt to obtain the variable varMC passed to the page by JSP,
  
  
Then you can use the value of this variable in JavaScript.
  
  
The JavaScript script assigns a value to the hidden field in form.
  
  
Var1="<% = VarMC %>"; // Get the variable value in JSP
  
  
Document. all. mc. value=Var1;
  
  
//-->
  
  
</Script> 
 
 

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