Submit to the current page, how to solve the problem of refreshing the repeated submission form? _html/css_WEB-ITnose

This post was last edited by lljl2009 on 2013-12-09 19:59:49

I am a complete novice, please give me some advice!
The requirements are:
1. There is a form on the page and two buttons, one is save and the other is cancel; the data in the form is read from file a;
2. In the form After the content is modified, click save to save the data to file a, and the current page will still be displayed; click cancel to cancel the changes;
3. The problem is that the form will be submitted repeatedly when clicking refresh. I implemented it with cgi and wrote The simple code is as follows:
show.html:
#include
#include "cgic.h"
#include
#include < ;stdlib.h>

char text_value[]={"AAAAAAAAA"}; // text_value is from a file
void htmlPage()
{
fprintf(cgiOut, "< html>n");
fprintf(cgiOut, "n");

fprintf(cgiOut, "< body> n");

fprintf(cgiOut, "

n");

fprintf(cgiOut, "n",text_value);

fprintf(cgiOut, "n");
fprintf(cgiOut, "n");
fprintf(cgiOut, "

n");

fprintf(cgiOut, "n");
fprintf(cgiOut, "n") ;
}

show_data.c:
#include
#include "cgic.h"
#include
#include
#include
#include "mypage.h"


int cgiMain()
{
if (cgiFormSubmitClicked("save") == cgiFormSuccess)
{
// save data to a file;
// ...
// reload page;
cgiHeaderContentType("text/ html");
htmlPage();
return 0;
}
//read data from a file
// ...
cgiHeaderContentType("text/html") ;
htmlPage();
return 0;
}


4. I tried several methods on the Internet: using global variables in javascript and using a hidden control are both No, because this value is always the initial value after my page is reloaded. It also doesn't work if I use a hidden iframe and then the form's target points to this frame. In this way, cancel can still be executed after clicking save; the save control cannot be disabled after submission. , because I still need to do some data saving and other processing in cgiMain, and this part is not executed after disable. . .

I don’t understand how other session, ajax and other methods are used. Can they achieve the purpose? Can you give me some advice on what to do? No clue. . .

Thank you!

Reply to the discussion (solution)

Generate a random timestamp at the back of the page
Compare the session before background extraction
For example:
http:/ /www.baidu.com?p=12345678912
Server-side fetch

if( isset( $_GET["p"] ) && $_GET["p"] != session["submit"] ){    // do sth.    // session["submit"] = $_GET["p"];};

Generate a random timestamp at the back of the page
Compare the session before background extraction
For example :
http://www.baidu.com?p=12345678912
Server-side fetch

if( isset( $_GET["p"] ) && $_GET["p"] != session["submit"] ){    // do sth.    // session["submit"] = $_GET["p"];};

Thank you for your reply! When does the back of the page mean? Where should I do this in this code? Also is there this Php code that I can apply directly to my code?