This is my first website and project and I'd like to be able to complete it.
I have a small, simple site running on a Raspberry Pi 2 in my room. On the site, users vote yes or no. My problem is, something isn't working.
The browser is not showing the correct values for the variables taken from the text file. When the yes or no button is pressed, PHP should add 1 to either the $yes variable or the $no variable depending on which button was clicked, obviously. This will be clearer when you see the code below.
Sometimes however, the variable is not echoed correctly in the table at the bottom of the page. The variable in the text file is updated each time the button is pressed. This leads me to believe that it's to do with the echoing or the writing and reading speed. On refreshing the page, the table usually updates.
The code below is my HTML page. I think this is correct. Apologies if this shows my lack of experience; I'm open to all suggestions!
<!DOCTYPE HTML>
<!--start of html. sets background image-->
<html style="background-image: url(confectionary.png); color:black; padding:20px;">
<head>
<title>Is the Sky Blue | Vote</title>
<!--sets up js funtion for buttons to call and start running it-->
<script type="text/javascript" src="vote.js"></script>
<!--calls css to position yes and no buttons-->
<link rel="stylesheet" href="navbar.css">
</head>
<body>
<!--first header-->
<h1 align="center"><font size="7">Is the sky blue?</h1>
<!--div with class="menu" allow css above to center the yes and no buttons-->
<div class="menu">
<ul>
<li name="vote" value="0" onclick="getVote(0)"><font size="6"><a href="yes.php">Yes</a></li>
<li name="vote" value="1" onclick="getVote(1)"><font size="6"><a href="no.php">No</a></li>
</ul>
</div>
<!--image of the sky-->
<div style="text-align: center;"><img style="width: 800px; height: 600px;" alt="" src="sky.jpg"></div>
</body>
</html>
yes.php below
<!DOCTYPE HTML>
<!--start of html. sets background image-->
<html style="background-image: url(confectionary.png); color:black; padding:20px;">
<head>
<title>Thank You For Voting</title>
<!--calls css to position yes and no buttons-->
<link rel="stylesheet" href="navbar.css">
</head>
<body>
<!--first header-->
<h1 align="center"><font size="6">Thank You For Voting</h1>
<div class="menu">
<ul>
<li><font size="6"><a href="index.html">Home</a></li>
</ul>
</div>
<hr>
<p align="center"><font size="5">You have voted that the sky is blue.</p>
<!--first part of php which declares variables for the table to use-->
<?php
$filename = "poll_result.txt";
$content = file($filename);
$array = explode("||", $content[0]);
$yes = $array[0];
$no = $array[1];
$total = $yes + $no;
?>
<!--table of results and graph-->
<h4>Result:</h4>
<table>
<tr>
<td>Yes:</td>
<td>
<img src="poll.gif"
width='<?php echo(100*round($yes/($no+$yes),2)); ?>'
height='20'>
<?php echo(100*round($yes/($no+$yes),2)); ?>%
</td>
</tr>
<tr>
<td>No:</td>
<td>
<img src="poll.gif"
width='<?php echo(100*round($no/($no+$yes),2)); ?>'
height='20'>
<?php echo(100*round($no/($no+$yes),2)); ?>%
</td>
</tr>
<tr>
<td>Total number of votes:</td>
<td><?php echo $total; ?></td>
</tr>
</table>
</body>
</html>
vote.js below
function getVote(int) {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else { // code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
document.getElementById("poll").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","poll_vote.php?vote="+int,true);
xmlhttp.send();
}
poll_vote.php below
<?php
$vote = $_REQUEST['vote'];
//get content of textfile
$filename = "poll_result.txt";
$content = file($filename);
//put content in array
$array = explode("||", $content[0]);
$yes = $array[0];
$no = $array[1];
if ($vote == 0) {
$yes = $yes + 1;
}
if ($vote == 1) {
$no = $no + 1;
}
//insert votes to txt file
$insertvote = $yes."||".$no;
$fp = fopen($filename,"w");
fputs($fp,$insertvote);
fclose($fp);
?>
This is most of the code behind the site.
Why does the $total variable not get shown properly in the table?
