How To Target A Specific PHP Function Using Ajax - php

Question

I am creating a simple comment program. i want to use ajax to refresh the comments and total number of comments. Keeping both functions in a single file is not working for me.
here is my code:
HTML:
<h3></h3>
<ul>
</ul>
PHP: include.php
//for comments
function main(){
try {
$query = connect()->prepare("SELECT * FROM comments WHERE article_id = 1627359589");
$query->execute();
echo json_encode($query->fetchAll());
} catch (PDOException $e) {
die("database connection failed");
}
}
// for total comment
function totalComment(){
$sql ="SELECT * FROM comments WHERE article_id = 1627359589";
$stmt = connect()->prepare($sql);
$stmt->execute();
$num = $stmt->rowCount();
echo json_encode($num);
}
main();
totalComment();
AJAX:
// for comment
setInterval(displayComments, 2000);
function displayComments(){
$.ajax({
url: "include.php",
type: "POST",
dataType: "JSON",
success: function(data){
for (var i = 0; i < data.length; i++) {
$("ul").append("<li>"+data[i] + "</li>")
}
}
})
}
// for total comments
setInterval(total, 2000);
function total(){
$.ajax({
url: "include.php",
success: function(data){
$("h3").html(data);
}
})
}

Answer 1

Set the PHP to process a named POST item and use switch to determine which function to use:
<?php
if( $SERVER['REQUEST_METHOD']=='POST' && isset( $_POST['cmd'] )){
function main(){
try {
$query = connect()->prepare("SELECT * FROM comments WHERE article_id = 1627359589");
$query->execute();
echo json_encode($query->fetchAll());
} catch (PDOException $e) {
die("database connection failed");
}
}
function totalComment(){
$sql ="SELECT * FROM comments WHERE article_id = 1627359589";
$stmt = connect()->prepare($sql);
$stmt->execute();
$num = $stmt->rowCount();
echo json_encode($num);
}
switch( $_POST['cmd'] ){
case 'comments':
main();
break;
case 'total':
totalComment();
break;
case 'banana':
banana();
break;
}
}
?>
In your javascript set the same parameter in each request but with a different value: data:{cmd:'banana'}, etc
function displayComments(){
$.ajax({
url: "include.php",
type: "POST",
data:{cmd:'comments'},
dataType: "JSON",
success: function(data){
for (var i = 0; i < data.length; i++) {
$("ul").append("<li>"+data[i] + "</li>")
}
}
})
}
function total(){
$.ajax({
url: "include.php",
data:{cmd:'total'},
success: function(data){
$("h3").html(data);
}
})
}
setInterval(displayComments, 2000);
setInterval(total, 2000);