jQuery Ajax 通过单击按钮但有两种不同的操作将数据发送到 php

Question

What I'm trying to achieve is a user to follow another user without having to refresh the page. So far I've played around and had no problem inserting and deleting the rows in mysql table, but now when I'm trying with AJAX I can't get it to work.

jquery

$(document).ready(function(){
$("#followbutton").click(function(e) {
e.preventDefault();
var theuserid = $('#theuserid').val();
var thefollower = $('#thefollower').val();

$.ajax({
url: 'includes/followuser.inc.php',
type: 'post',
data: {'theuserid': theuserid, 'thefollower': thefollower, 'submitFollow': true},
success: function(response){
$('#followmessage').html(response);   
$("#followmessage").show().delay(3000).fadeOut();
$('#followbutton').hide();
$('#unfollowbutton').show();

// $("#unfollowbutton").hover(function(){
// $(this).text("Unfollow");
// }, function(){
// $(this).text("Unfollow");
// });
    
}
});
});
});

$(document).ready(function(){
$("#unfollowbutton").click(function(e) {
e.preventDefault();
var theuserid = $('#theuserid').val();
var thefollower = $('#thefollower').val();

$.ajax({
url: 'includes/followuser.inc.php',
type: 'post',
data: {'theuserid': theuserid, 'thefollower': thefollower, 'submitUnfollow': true},
success: function(response){
$('#followmessage').html(response);   
$("#followmessage").show().delay(3000).fadeOut();
$('#unfollowbutton').hide();
$('#followbutton').show();

//I want the button to change its text to Following and when hovering it should say unfollow if user is followed

}
});
});
});

followuser.inc.php

<?php
require_once 'dbh.inc.php';
require_once 'functions.inc.php';
if (isset($_POST["submitFollow"])){
$userthatisfollowed = $_POST["thefollower"];
$theuserid = $_POST["theuserid"];

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$stmt = $conn->prepare('INSERT INTO userfollow (thefollower, theuserid, followstatus) VALUES (?,?,?)');
$followstatus = 1;
$stmt->bind_param('sss', $userthatisfollowed, $theuserid, $followstatus);
$stmt->execute();
echo $response = "<span>Followed!</span>";
$stmt->close();

} else if(isset($_POST["submitUnfollow"])){
$userthatisfollowed = $_POST["thefollower"];
$theuserid = $_POST["theuserid"];
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$stmt = $conn->prepare('DELETE userfollow FROM userfollow WHERE thefollower = ? AND theuserid = ?');

$stmt->bind_param('ss', $userthatisfollowed, $theuserid);
$stmt->execute();
echo $response = "<span>Unfollowed!</span>";
$stmt->close();
} else {
    echo "DID NOT WORK";
}

profile.php

if(isset($_SESSION["userid"]) && $_SESSION["userid"] != $userthatisfollowed) {
?>
<form action="<?php echo htmlspecialchars("includes/followuser.inc.php");?>" id="followform" method="post">
<?php

if ($resulted->num_rows > 0){
$subscribe_status = "Unfollow";
$subscribe_text = "Following";

} else {
$subscribe_status = "Follow";
$subscribe_text = "Follow";
}


echo "<button name='submit".$subscribe_status."' id ='unfollowbutton' type='submit' style='display:none'>";
echo "<span>".$subscribe_text."</span>";
echo "</button>";

echo "<button name='submit".$subscribe_status."' id ='followbutton' type='submit'>";
echo "<span>".$subscribe_text."</span>";
echo "</button>";


// echo "<button name='submit".$subscribe_status."' id ='notificationbell' type='submit' style='display:none'>";
// echo "<i class='fa fa-bell'></i>";
// echo "</button>";

echo "<div id='followmessage'></div>";
?>
<input type="hidden" name="theuserid" id="theuserid" value="<?php echo $_SESSION["userid"] ?>">
<input type="hidden" name="thefollower" id="thefollower" value="<?php echo $userthatisfollowed; ?>">
</form>
<?php
}

What's worth noting is that I'm getting the response DID NOT WORK which tells me that if(isset($_POST["submitUnfollow"])) is not set. However, If I try with if(isset($_POST["theuserid"]) && (isset($_POST["thefollower"])) then it actually works for the insert query but not for the delete query.

Answer 1

You're missing the submitFollow parameter in the data: object. Instead, you have followbutton: true , which isn't used by the PHP code. So change that to:

data: {'theuserid': theuserid, 'thefollower': thefollower, 'submitFolow': 'true'},

And for the unfollow button, use submitUnfollow instead.