back button

Hi all,

Im very new to php. Currently im creating an online exam system which uses php and mysql as the database. I have registration and login page which works pretty fine. I had problem when it comes to question page. I have about 20 questions. As soon the user login to the system, he should start answering. The system should remember the number of correct answers til the 20th question. I used session to hold the value of number of correct answers. For example :

Login.php  login and redirect to ques1.php

ques1.php  first question, click submit to redirect to ques2.php

ques2.php  second question. Click submit to go to ques3.php or click back to return to ques1.php

The problem is when I click back button the counter which holds the value of correct answer doesn’t work properly.
Let say I’ve answered 3 questions correctly, the counter should show 3, then if click back button, it suppose become 2 but it doesn’t happen here. The counter increase becomes 4.

Code sample as below….

Expand|Select|Wrap|Line Numbers

  ques1.php

<html>

<head>

<title>Question 1 </title>

</head>

<body>

<form action="ques2.php" method="GET">

<font size="3" face="Verdana">

<?php

session_start();

echo "Current User : ".$_SESSION['name'];

?>

<br><br><b>Question 1</b><br><br>

</font>

<font size="2" face="Verdana">

What is HTML?<br><br>

<input type="radio" name="ques1" value="a"> Hyper Text Markup Language<br>

<input type="radio" name="ques1" value="b"> Hyper Transfer Markup Language<br>

<input type="radio" name="ques1" value="c"> Hyper Text Transfer Language<br><br>

<INPUT TYPE=SUBMIT VALUE="submit">

</form>

</body>

</html>
 
 ques2.php

<html>

<head>

<title>Question2</title>

</head>

<body>

<form action="ques3.php" method="GET">

<font size="3" face="Verdana">

<br><br><b>Question 2</b><br><br>

</font>

<font size="2" face="Verdana">

What is PHP?<br><br>

<input type="radio" name="ques2" value="a">Personal Home Page<br>

<input type="radio" name="ques2" value="b"> PHP Hypertext Preprocessor<br>

<input type="radio" name="ques2" value="c"> Personal Hypertext Processor<br><br>

<INPUT TYPE=SUBMIT VALUE="submit">

<input type="button" name="back" value="Back" onClick="history.go(-1);"><br>

</font>

</form>

<?php

require 'db.php';

session_start();

$counter=0;

$answer1=$_GET['ques1'];
 
$result=mysql_query("select ans from answer where qid='q1'");

$res=mysql_fetch_array($result);
 
if($answer1==$res["ans"])

{

    $counter=$counter+1;

    $_SESSION['ans']=$counter;

}

else

{

$_SESSION['ans']=$counter;

}

echo "Current User : ".$_SESSION['name']."<br>";

echo "Number of correct".$_SESSION['ans'];

?>

</body>

</html>
 
 ques3.php

<html>

<head>

<title>Question3</title>

</head>

<body>

<form action="ques4.php" method="GET">

<font size="3" face="Verdana">

<br><br><b>Question 3</b><br><br>

</font>

<font size="2" face="Verdana">

What is MySQL?<br><br>

<input type="radio" name="ques3" value="a">Markup Languange<br>

<input type="radio" name="ques3" value="b"> Programming Language<br>

<input type="radio" name="ques3" value="c"> Database<br><br>

<INPUT TYPE=SUBMIT VALUE="submit">

<input type="button" name="back" value="Back" onClick="history.go(-1);"><br>

</font>

</form>

<?php

require 'db.php';

session_start();

$answer2=$_GET['ques2'];

//$counter=$_SESSION['ans'];
 
$result=mysql_query("select ans from answer where qid='q2'");

$res=mysql_fetch_array($result);
 
if($answer2==$res["ans"])

{

    //$counter=$counter+1;

    $_SESSION['ans']++;

}

echo "Current User : ".$_SESSION['name']."<br>";

echo "Number of correct".$_SESSION['ans'];

?>

</body>

</html>

What should I change in my code?

Thank you.

Jul 9 '08 #1

Subscribe Post Reply

1786

developing

110

100+

if you are storing the questions in a database, then you dont need a separate file for each question.

make one file called ques.php and use the same code. add a couple more GET/POST variables that identify

current question
user answer
current question number
next question

and maybe a few other things

this way it will be less work for you and way less maintenance for you in the future.

a better way to track counter would be to have an array (session variable) that associates the 'questions already asked' with the 'sequence number' they were asked in.

if the 'current question number' already exists in the said array, then display the 'sequence number' for it
else add the 'current question number to the array

Jul 9 '08 #2

Similar topics

Back button functionality

by: KK | last post by:

Hi, I am using history.go(-1) for implementing the back button functionality. Its working fine but with this exception. 1. The page which is having back button has some hyperlinks on it. ...

HTML / CSS

Modifying the Back Button Function

by: Peter D. Dunlap | last post by:

Hello, I realize that this may not be the best place to ask this question, through the application is asp.net. I also realize that questions about disabling the back button are generally met...

ASP.NET

back button problem

by: Hypo | last post by:

I added a 'Back' button to my page, and wrote 'OnClick' code something like this: Response.Write("<script>history.go(-" + iDepthIndex.ToString() + ");</script>"); But, it dosnt work! Effect...

ASP.NET

A selection changes on asp page with 6 dependent list boxes, when back

by: Galina | last post by:

Hello I have 6 dependent list boxes on my ASP page:  Faculty;  Lecturer;  Course;  Course occurrence;  Group;  Week commencing date. When faculty is selected, lists of lecturers and...

ASP.NET

dropdown list maintains selection when back button is used.

by: Mark | last post by:

I have two dropdown lists. Both have autopostback set to true. In both dropdowns, when you select an item from the list, it redirects to the Value property of the dropdown. Nothing fancy. ...

ASP.NET

Dealing with the Back button

by: Tom wilson | last post by:

I can't believe this is such an impossibility... I have an asp.net page. It accepts data through on form fields and includes a submit button. The page loads up and you fill out some stuff. ...

ASP.NET

Message back from JavaScript

by: tshad | last post by:

I am trying to set up a Javascript popup box that has a way of sending back a message to asp.net on how to process some data. At the moment I am just doing: ...

ASP.NET

Back Button Issues

by: Tom wilson | last post by:

I'm developing an application that is a benefits enrolment website. The benefits can be of any type in any order as stored in a SQL server. On each page is a Back and Next button. At a certain...

ASP.NET

Page_Load method issues with Back Button

by: Sridhar | last post by:

Hi, I have a question regarding the Page_Load method and Back Button of Internet explorer. I have created a webform. In that webform I have several Text Boxes. Also I have two buttons. When I...

ASP.NET

Browser back button

by: ns21 | last post by:

How can the browser back button be disabled If the form is submitting information to other pages or submitting to itself or using redirections. I tried the tweaks like history.forward(1) in each...

Javascript

Cloud Servers without Credit Card and Email Registration: A Simpler Way to Get on the Cloud

by: CloudSolutions | last post by:

Introduction: For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...

General

Wordpress or something else?

by: Faith0G | last post by:

I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...

Content Management Systems

Easy Steps to Fix "Canon Printer Won't Connect to WiFi Network"

by: taylorcarr | last post by:

A Canon printer is a smart device known for being advanced, efficient, and reliable. It is designed for home, office, and hybrid workspace use and can also be used for a variety of purposes. However,...

General

Batch import of multiple excel files into the database

by: ryjfgjl | last post by:

If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...

Data Management

Merging data from multiple Excel files

by: ryjfgjl | last post by:

In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...

Data Management

Migrating Website to Cloud - Emmanuel Katto

by: emmanuelkatto | last post by:

Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel

General

Looking to do Android software development, any suggestions? Is flutter better?

by: nemocccc | last post by:

hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?

General

Is that possible of reading the .csv file in column wise and the column have different lengths ?

by: Sonnysonu | last post by:

This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...

C / C++

How to build RAID in BIOS?

by: Hystou | last post by:

There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...

Computer Hardware