Different front-end and back-end cookies under second-level domain names, background C # errors that are easy to make when calling front-end JS Methods

Because on the register page, click Register to complete the following tasks:

① Add the registration information to the database through the background,

② "Registration successful" is displayed on the front-end ",

③ Write the registered name and gender into the cookie.

At first, I thought everything was done in the background, but I found a problem. The cookie generated in the background was in the first-level domain name. What I did was in the second-level domain name, and I needed to modify it in the background, I found a lot of information but could not succeed.

 

The background code is as follows:

 

// Set the condition cookie
Private void setwherecookie (string where)
{
Httpcookie cookie = new httpcookie ("username ");
Cookie. value = where;
Cookie. expires = datetime. Now. adddays (1D );

Response. Cookies. Add (cookie );
}

Protected void button#click (Object sender, eventargs E)
{
Username = textbox1.text;
Setwherecookie (username );
Response. Write ("<SCRIPT> If (confirm ('registration successful, you will log on to the homepage! ') Window. Location. href ='./Homepage. aspx '; </SCRIPT> ");
}

 

 

However, when a cookie is written on the front end, the second-level domain name can be taken directly in the domain, but the second-level domain name cannot be written on the background.

Cookie file generated at the front end
Sex
2
Localhost/jingsystem/
1600
1488151808
30066602
237686608
30066552
*
Username
Sssssaaaqw
Localhost/jingsystem/
1600
88282624
30066606
3136544720
30066555
*
Cookie file generated in the background
Sex
2
Localhost/
1600
1488151808
30066602
237686608
30066552
*
Username
Sssssaaaqw
Localhost/
1600
88282624
30066606
3136544720
30066555
*

After finding a solution, add the path in the background cookie code to control the cookie. Path = "/jingsystem/", and finally solve the problem.

 

Another solution is to write the method at the front end and call it at the backend.

The front-end code is as follows:

 

Function setcookie (name, value) // two parameters: one is the name of the cookie and the other is the value.
{
VaR days = 0.25; // This cookie will be saved for 30 days
VaR exp = new date (); // new date ("December 31,999 8 ");
Exp. settime (exp. gettime () + days x 24x60*60*1000 );
Document. Cookie = Name + "=" + escape (value) + "; expires =" + exp. togmtstring ();
}

Function writecookie ()
{
Alert ("hehe ");
Setcookie ("username", document. getelementbyid ("textusername"). value );
VaR OBJ = Document. getelementsbyname (radiobuttonlist1 );
For (I = 0; I <obj. length; I ++)
{If (OBJ [I]. Checked) setcookie ("sex", I );

}
}

 

 

 

Background code:

 

Protected void button#click (Object sender, eventargs E)
{
Username = textbox1.text;
Clientscript. registerstartupscript (clientscript. GetType (), "myscript", "<SCRIPT> writecookie (); If (confirm ('registered successfully, you will log on to the homepage! ') Window. Location. href ='./Homepage. aspx '; </SCRIPT> ");
Response. Write ("<SCRIPT> If (confirm ('registration successful, you will log on to the homepage! ') Window. Location. href ='./Homepage. aspx '; </SCRIPT> ");
}

 

 

If the previous sentence is not executed, You have to modify the background Code as follows:

Clientscript. registerstartupscript (clientscript. GetType (), "myscript", "<SCRIPT> writecookie (); If (confirm ('registered successfully, you will log on to the homepage! ') Window. Location. href ='./Homepage. aspx '; </SCRIPT> ");

 

Finally!

There are several questions:

① Why can the cookie written by the front-end directly carry a second-level domain name in the domain, and the path must be added for background writing.

② Clientscript. registerstartupscript and response. Write are written before and after, and are not executed before.

 

 

 

 

In addition, we recommend three good articles found in solving the problem:

A very practical class in the background of a high handwriting: http://blog.csdn.net/zhoufoxcn/archive/2008/04/21/2312440.aspx

Summary of front-end code for server call: http://www.cnblogs.com/lhuser/articles/1458825.html

Asp.net JS and C # for mutual access: http://www.cnblogs.com/ywqu/archive/2009/01/08/1371483.html

Explanation of cookie properties http://www.webdn.com/web_file/program/asp/N0610925/