Update HTML table every 5 seconds with mySQL, and PHP?
Question
I have a simple PHP page that sends a query to a mySQL database and displays the data onto a HTML table.
How can I get it to do this every 5 seconds? Currently it does this upon the page loading. The database will have changing data, so am trying to get the code to refresh every 5 seconds to keep the table updated.
How might I go upon doing this?
3 answers
solution1
2 2014-04-27 05:23:48
You need to use a client-side scripting language such as JavaScript to have a webpage do something after it has been served to a client.
Specifically, you will want to use timers and AJAX calls . You may also find the jQuery library useful for abstracting AJAX calls however it is not a requirement.
solution2
0 ACCPTED 2014-04-27 05:42:00
You need to use javascript ajax. For example ,
<script>
function loadXMLDoc()
{
var xmlhttp;
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("myDiv").innerHTML=xmlhttp.responseText; // your div
}
}
xmlhttp.open("GET","getdatabase.php",true); //your php file
xmlhttp.send();
}
window.setInterval(function(){
loadXMLDoc();
}, 5000);
</script>
Then in html , you must have a div with specified ID(myDiv) Fpr example:
<body>
<div id="myDiv"></div>
</body>
Then in getdatabase.php you must fetch the value from the database and echo it out. For example,
<?php
$con=mysqli_connect("example.com","peter","abc123","my_db");// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT * FROM Persons");
echo "<table border='1'>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>";
while($row = mysqli_fetch_array($result)) {
echo "<tr>";
echo "<td>" . $row['FirstName'] . "</td>";
echo "<td>" . $row['LastName'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_close($con);
?>
Hope it works , see more at www.w3schools.com/
solution3
-2 2014-05-29 08:05:33
Use javascript timers. From there-on u can periodically run the SQL command to read the databases.
If this problem still arises, I can post some example code.
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