How to fetch data from mysql when press button? - php

Question

I am trying to fetch data randomly from mysql when click button,here is my code.
<?php
$con=mysqli_connect("localhost","root","","school");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT description From task ORDER BY RAND() LIMIT 2");
echo "<p><strong>Question:</strong></p>";
while($row = mysqli_fetch_array($result))
{
echo "<p>". $row['description'] ."</p>";
}
mysqli_close($con);
?>
<input type="button" value="Get Assignment" onclick="myfunc()">
</body>
</html>
I expect the output when i'm clicking Get Assignment button it will display random question, until i will display empty box.

Answer 1

You should wrap your php code to isset function which will check if data is send then run else don't.
isset function check if variable is set & not null
alternatively you can call Ajax to append data on click. here
<?php
$con=mysqli_connect("localhost","root","","school");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
if(isset($_POST['submit'])){
$result = mysqli_query($con,"SELECT description From task ORDER BY RAND() LIMIT 2");
echo "<p><strong>Question:</strong></p>";
while($row = mysqli_fetch_array($result))
{
echo "<p>". $row['description'] ."</p>";
}
mysqli_close($con);
}
?>
<input type="button" name="submit" value="Get Assignment" onclick="myfunc()">
</body>
</html>
edit fixed my code
you need to wrap your input button to a form which will submit the form to the page itself
<form method="post" action="">
<input type="submit" name="submit" value="Get Assignment">
</form>