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Ajax And PHP : Handling Multiple Posts in A Single Page

I am developing a webpage where multiple posts from the Database is shown one by one in a single page much like twitter or facebook.
I need to use Ajax for comments and likes. The comment system should be nested as well.
The problem I am having is each post is having a unique post_id and I need to transfer it through Ajax for inserting the comments into the DB.
The below HTML is inside a PHP for loop for getting the posts from Database. So I have given post_id as every comment element's id to get the unique post comment.
<script>
function addcomment(abc) {
var temp1 = abc;
var post_id = temp1.value; // POST ID
var comment = document.getElementById(post_id).value;
$.ajax({
type: "POST",
url: "addcomment.php",
data: {
post_id:post_id,
comment:comment
},
success: function(response) {
document.getElementsByClassName(post_id).innerHTML = response;
}
});
}
</script>
<div class="comment_section" id="comment_section">
<textarea type="text" id="<?php echo($post_id); ?>" placeholder="comment Here..." value=""></textarea>
<button id="comment_button" value="<?php echo ($post_id); ?>" onclick="return addcomment(this);">Comment</button>
<br>
<span class="<?php echo($post_id); ?>"></span>
</div>
And the addcomment.php looks like this:
<?php
include("connect.php");
$postid = $_POST['post_id'];
$comment = $_POST['comment'];
$sql1 = "INSERT INTO comments (name,comment) VALUES ('$postid','$comment')";
$result = $db->query($sql1);
$sql = "SELECT * FROM comments ORDER BY id DESC LIMIT 0,1";
$result1 = $db->query($sql);
while($row = $result1->fetch_assoc()) {
$post = $row['name'];
$comment_op = $row['comment'];
?>
<?php echo $comment_op; ?>
<br>
<?php echo $post; ?>
<?php } ?>
How can I get the comment when the Comment button clicked and store it in the DB and return the Comment below the comment area using AJAX ?

For display comments on specific post first you create comment section and use
<section id="comments-post_id"></section>
when you successfully add comment via above ajax request code get the response and create comment html and append in your comment section.
$("#comments-post_id").html($response);
make sure you have already create your comment HTML in controller or in ajax file where you get the response.
and for the rendering all post data user inside loop or recursive function to get all comments of your specific post
Need more help feel free and ask :)

Trying to print onto an html page via PHP

I'm making a custom WYSIWYG editor with a save function, and through the save function I have run some code to get everything within a certain div, save it into a data table or overwrite it. But right now, I'm trying to load the page back.
The process is as follows: you press the save button, and it runs a PHP script called save.php, which is seen below.
My issue is that I want it to load or echo the contents within a certain div on the original html page. How would I go about doing that? I need it to work like Javascript's innerHTML function, basically.
Below are the files I use, at least the relevant parts.
test.html:
<form method="post" name="blog-post" id="blog-post">
<input type="hidden" name="postID" value="1"><!--Get the post's id-->
<div class="blog-editor-bar">
<a href="#" data-command='save'
onclick="submitForm('save.php');">
<i class='fa fa-save'></i>
</a>
</div>
<div id="blog-textarea" contenteditable>
</div>
<textarea style="display:none;" id="blog-post-cont" name="post-content"></textarea>
</form>
test.js:
function submitForm(action){
var theForm = document.getElementById("blog-post");
theForm.elements("post-content").value = document.getElementById("blog-textarea").innerHTML;
theForm.action = action;
theForm.submit();
}
save.php:
$conn = mysqli_connect('localhost', 'root', '', '');
if (mysqli_connect_errno()){
echo "<p>Connection Failed:".mysqli_connect_error()."</p>\n";
}
//store stuff in database
//Get Variables
$postid = $_POST['postID'] ? $_POST['postID'] : null;
$post = $_POST['post-content'] ? $_POST['post-content'] : null;
//if exists, overwrite
if($postid != null || $postid != ""){
$sqlSave = "SELECT * FROM wysiwyg.post WHERE idpost = $postid";
$rSave = mysqli_query($conn, $sqlSave) or die(mysqli_error($conn));
if(mysqli_num_rows($rSave)){
$sqlOverwrite = "INSERT INTO wysiwyg.post(post) VALUES(?) WHERE idpost = ?";
$stmt = mysqli_prepare($conn, $sqlOverwrite);
mysqli_stmt_bind_param($stmt, "sd", $post, $postid);
mysqli_stmt_execute($stmt);
mysqli_stmt_close($stmt);
mysqli_close($conn);
} else {
newSave();
}
loadSave();
}
function newSave(){
$sqlNewSave = "INSERT INTO wysiwyg.post(post) VALUES(?)";
$stmt = mysqli_prepare($conn, $sqlNewSave);
mysqli_stmt_bind_param($stmt, "s", $post);
mysqli_stmt_execute($stmt);
mysqli_stmt_close($stmt);
mysqli_close($conn);
}
function loadSave(){
$sqlLoad = "SELECT * FROM wysiwyg.post WHERE idpost = $postid";
$rLoad = mysqli_query($conn, $sqlLoad) or die(mysqli_error($conn));
//This is the part I'm stuck on
}
Thank you all in advance for helping me out! I've been stuck on it for at least a few hours!
EDIT: Before people comment on SQL Injections, I have taken it into consideration. This is me getting the code working on my localhost before I run it through a ton of anti-sql injection methods that I have already done in the past. The code i provide is only important to the functionality at this point.
EDIT #2: The anti-injection code already exists. I guess i seem to have forgotten to provide that information. I repeat, the code I have provided here is only code relating to functionality. I have escaped the strings, trimmed, etc. and more, but that code is not necessary to provide for people to get an understanding of what it is i am trying to do.

You can use an AJAX request to communicate with the server, send data and receive a response. There are many good tutorials out there, but since I first learned it in W3Schools website I am going to refer you there.
JavaScript tutorial.
jQuery tutorial.

You can use an AJAX request which is written like this:
<script>
$(document).ready(function(){
$.ajax({ //start an AJAX call
type: 'GET', //Action: GET or POST
data: {VariableName: 'GETvalue'}, //Separate each line with a comma
url: 'Destination.php', //save.php in your case
success: function(data)){ //if values send do this
//do whatever
}
}); //end ajax request
});
</script>
This allows you to send information to your php page without refreshing
So in my example you can do this on the PHP side
<?php
echo $_GET['VariableName'];
?>
Will echo out "GETvalue as specified in the data section of the Ajax call"
EDIT************
In the AJAX call you can add dataType if you want json
$.ajax({
type: 'GET',
data: {VariableName: 'GETvalue'},
dataType: 'json' // Allows Json values or you can change it to whatever you want
url: 'Destination.php',

AJAX does not POST results to php page

I'm trying to create a player edit system for an admin section of a football website. The process goes as follows:
Once a coach has logged in on 'coaches.php', they can then choose what coaching session they want to look at via dropdown, which then populates the 'player' dropdown (done via js below)
form on coach-home.php
<form id="form1" name="form1" method="post" action="coach-player.php">
<label>Activity :</label>
<select name="activity" class="activity">
<option selected="selected">--Select Activity Group--</option>
<?php
include('dbconnect.php');
$sql=mysql_query("select activity from coaches where username='$coach'");
while($row=mysql_fetch_array($sql))
{
$activity2=explode(",",$row["activity"]);
foreach ($activity2 as $activity)
echo '<option value="'.$activity.'">'.$activity.'</option>';
} ?>
</select> <br/><br/>
<label>Player :</label> <select name="username" class="username">
<option selected="selected">--Select Player--</option>
</select>
<input type="text" name="pid" class="pid" id="pid" value="<?php echo $pid; ?>" />
<input type="submit" name="button" id="button" value="Log In" />
</form>
JS request on coach-home.php
<script type="text/javascript">
$(document).ready(function()
{
$(".activity").click(function()
{
var activity=$(this).val();
var dataString = 'activity='+ activity;
$.ajax
({
type: "GET",
url: "username.php",
data: dataString,
cache: true,
success: function(html)
{
$(".username").html(html);
}
});
});
});
</script>
username.php
<?php
if($_GET['activity'])
{
$activity=$_GET['activity'];
$sql=mysql_query("SELECT pid, username FROM stats WHERE activity='$activity'");
while($row=mysql_fetch_array($sql))
{
$pid=$row['pid'];
$username=$row['username'];
echo '<option value="'.$username.'">'.$username.'</option>';
}
}
?>
Once all of this is done, the coach submits the form, taking them to coachplayer.php. This is where the problem begins.
coachplayer.php is a template page, with empty fields filled with echo's, to echo the player details where necessary. A query runs to get the id of the selected player, bring up their details and fill the page. Instead, however, it echos what usually comes up if the query cannot find a matching result via $playerCount as shown below, saying "Player doesn't exist".
coach-player.php Query
<?php
// Check to see the URL variable is set and that it exists in the database
if (isset($_GET['username'])) {
// Connect to the MySQL database
$puser = preg_replace('#[^0-9]#i', '', $_GET['username']);
// Use this var to check to see if this ID exists, if yes then get the product
// details, if no then exit this script and give message why
$sql = mysql_query("SELECT * FROM stats WHERE username='$puser' LIMIT 1");
$productCount = mysql_num_rows($sql); // count the output amount
if ($productCount > 0) {
// get all the product details
while($row = mysql_fetch_array($sql)){
$username = $row["username"];
$pid = $row["pid"];
$position = $row["position"];
$activity = $row["activity"];
$agegroup = $row["agegroup"];
$goals = $row["goals"];
$assists = $row["assists"];
$cleans = $row["cleans"];
$motm = $row["motm"];
}
} else {
echo "That player does not exist.";
exit();
}
} else {
echo "Data to render this page is missing.";
exit();
}
?>
The issue here is that whilst it is defined in username.php, the pid does not get sent over and saved when the rest of the form on coach-home sends. I have tried changing from GET to POST with no avail. I have also just tried using the 'username' instead of 'pid' but I get "That player does not exist."; - meaning no variables outside of the ajax request is sending.
What is it that needs to be altered to save and post the data mentioned?

Looking at your code the $username and $pid variables are not being passed to either coach-home.php or coach-player.php, thus when you try to write to the database the parameter $_GET['username'] or $_GET['pid'] is set (because you have provided an input field in your form), but it has no value! and thus there is no player that exists with an empty pid or username.
Also note that in the form you have specified the method as post, but in the php you are referencing the get hash. If you submit by post you access variables with $_POST, submit with get you access with $_GET.
My suggestion is to use the session hash to store the username and pid of the user.
When the user logs in:
$_SESSION['username'] = 'jonnysmith'
$_SESSION['pid'] = '45'
This will mean when you initiate the database query you will just reference the session value instead of the get value for the parameter.
Delete your input field for username/pid in the form.
Call session_start(); in your config.php file to enable the session hash.
Call session_destroy(); when the user logs out to clear the session hash.
Also you will need to logout and log back in for the changes to take effect and the value of username/pid to be stored in the session hash.
Happy hunting!

Your regex is actually replacing your whole username variable with ''
Based on your comment, I've done a test match with the name 'Radamel Falcao' and echo-ed $puser and I got empty string, so apparently, this regex is your problem.
$puser = preg_replace('#[^0-9]#i', '', $_GET['username']);

Form not posting variables/mySQL Query not searching corrently

I'm trying to create a player edit system for an admin section of a football website.
The process goes as follows:
Once a coach has logged in on 'coaches.php', they can then choose what coaching session they want to look at via dropdown, which then populates the 'player' dropdown (done via js below)
coaches.php form
<form id="form1" name="form1" method="post" action="coachplayer.php?id=' .$id. '">
<label>Activity :</label>
<select name="activity" class="activity">
<option selected="selected">--Select Activity Group--</option>
<?php
include('dbconnect.php');
$sql=mysql_query("select activity from coaches where username='$coach'");
while($row=mysql_fetch_array($sql))
{
$activity2=explode(",",$row["activity"]);
foreach ($activity2 as $activity)
echo '<option value="'.$activity.'">'.$activity.'</option>';
} ?>
</select> <br/><br/>
<label>Player :</label> <select name="username" class="username">
<option selected="selected">--Select Player--</option>
</select>
<input name="thisID" type="hidden" value="<?php echo $id; ?>" />
<input type="submit" name="button" id="button" value="Log In" />
</form>
coaches.php js function
<script type="text/javascript">
$(document).ready(function()
{
$(".activity").change(function()
{
var activity=$(this).val();
var dataString = 'activity='+ activity;
$.ajax
({
type: "POST",
url: "ajax_city.php",
data: dataString,
cache: false,
success: function(html)
{
$(".username").html(html);
}
});
});
});
</script>
<style>
label
{
font-weight:bold;
padding:10px;
}
</style>
As the js above shows, the player list is handled via a separate page with a query on it as follows:
<?php
if($_POST['activity'])
{
$activity=$_POST['activity'];
$sql=mysql_query("SELECT id, username FROM stats WHERE activity='$activity'");
while($row=mysql_fetch_array($sql))
{
$id=$row['id'];
$username=$row['username'];
$activity=$row['activity'];
echo '<option value="'.$username.'">'.$username.'</option>';
}
}
?>
Once all of this is done, the coach submits the form, taking them to coachplayer.php. This is where the problem begins.
coachplayer.php is a template page, with empty fields filled with echo's, to echo the player details where necessary. A query runs to get the id of the selected player, bring up their details and fill the page. Instead, however, it echos what usually comes up if the query cannot find a matching result via $playerCount as shown below, saying "Player doesn't exist".
coachplayer.php SQL query
<?php
// Check to see the URL variable is set and that it exists in the database
if (isset($_GET['id'])) {
// Connect to the MySQL database
$targetU = preg_replace('#[^0-9]#i', '', $_GET['id']);
// Use this var to check to see if this ID exists, if yes then get the player
// details, if no then exit this script and give message why
$sql = mysql_query("SELECT * FROM stats WHERE id='$targetU' LIMIT 1");
$playerCount = mysql_num_rows($sql); // count the output amount
if ($playerCount > 0) {
// get all the product details
while($row = mysql_fetch_array($sql)){
$id = $row["id"];
$username = $row["username"];
$position = $row["position"];
$activity = $row["activity"];
$agegroup = $row["agegroup"];
$coach = $row["coach"];
$goals = $row["goals"];
$assists = $row["assists"];
$cleans = $row["cleans"];
$motm = $row["motm"];
$attend = $row["attend"];
}
} else {
echo "Player doesn't exist.";
exit();
}
} else {
echo "Data to render this page is missing.";
exit();
}
?>
As I'm sure you can tell, I'm not too great of a coder, so it's very possible that it's a simply var that needs changing but any ideas where I have gone wrong will be much appreciated.
Thank you in advance.

You are using a form with post method. And the action URL seems quite different
<form id="form1" name="form1" method="post" action="coachplayer.php?id=' .$id. '">
Change it to
<form id="form1" name="form1" method="post" action="coachplayer.php">
and in coachplayer.php. Use
isset($_POST['thisID']

Ok, I admit this is not an answer to your question BUT, to be honest there is no such thing as 'your question' - there are contents of four files each of them with their own problems, and an implicit request to grock all of those 4 files and tell you what does not work and how it should be made to work.
Having said that:
Divide and conquer. Make sure your first script does exactly what needs to be done. Then second, then 3rd and only then 4th.
Use tools: For javascript - Dev Tools or Firebug. For queries - MySQL Workbench
When testing JS use console (here you can try out your js code interactively.
) and source tabs - there you can set breakpoints and follow execution line by line. Look at network tab - there you can see request (headers) and responses.
When debugging PHP comment out all your code and use var_dump every step of the way. I use PHP Storm so that i can debug PHP line by line real time.
And better ask questions that can be described with the least lines of code
PS. You can simulate GET requests by typing url in browser - that way you know whether your server side works or not without relying on unreliable JS

Just a Quick look, but your sql Statement seems wrong. Your sql query will search for the Player with the id '$targetU'. Make sure to enter the variable correctly

AJAX: Replace a div's content with a specific div from the collected data

To me that looks correct, but i'm not experienced with AJAX in the slightest, been stuck at it for hours trying many variations including filter and it's all been useless. This is currently what i have and i can't see anything wrong with it.
What is happening is that no chat messages are showing up like they usually do, if i was to just refresh the page.
What i am simply trying to accomplish is a chat interface if that has any relevance.
Here is a live example of what is happening: http://www.mixpix.eu/chat/chat.php?r=G97NxXy4exbLQPFU
$(document).ready(function() {
var interval = setInterval(function() {
$.ajax({
dataType: "html",
url: 'chat.php?r=' + <?php echo "'" .$_GET['r']. "'"; ?> ,
success: function(data) {
var trim = $(data).find('.message_window');
$('.message_window').replaceWith(trim);
}
});
}, 1000);
});
Here's the contents of my body tag:
<div class="wrapper">
<div class"inbox_window" id="style-3">
</div>
<div class="message_window" id="style-3">
<table width="100%">
<p class="talking_to"><?php echo getFirstnamebyID($_GET['r']); ?></p>
<?php echo displayMessages(); ?>
</table>
</div>
<form class="submit_form" method="post" <?php echo 'action="chat.php?r='.$_GET['r'].'"' ?>>
<input type="text" name="message" placeholder="Type message here" />
<input type="submit" value="Send" name="s_say"/>
</form>
</div>
displayMessages() function in php:
function displayMessages() {
$user_id = getUserID();
$sql = mysql_query(strip_tags("SELECT * FROM inbox WHERE (send_id='".$user_id."' OR send_id='".$_GET['r']."') AND (rec_id='".$_GET['r']."' OR rec_id='".$user_id."') ORDER BY timestamp;"));
if (mysql_num_rows($sql) != 0) {
while($row = mysql_fetch_assoc($sql)) {
if ($row['send_id'] == $user_id) {
echo '<tr><td><p class="sm">'. $row['messages'] .'</p></td></tr>';
} else if ($row['send_id'] == $_GET['r']) {
echo '<tr><td><p class="rm">'. $row['messages'] .'</p></td></tr>';
} else {
echo "Unable to display messages.";
}
}
} else {
echo "Be the first to say hello!";
}
}
I would be highly thankful for any ones help as it's driving me a bit insane.

You've got a few things happening here that are going to cause you problems...
On the JavaScript side, setInterval is a hacky way to keep your content current, this could better be achieved with sockets. If you really want to do it this way, returning the whole document (including the HTML head) is not your best option -- maybe send an extra query param that tells your PHP to only send the messages section, or better yet, the messages that have been added since the timestamp you last checked.
In your markup, you can't put a paragraph tag directly inside your table, or raw text, as can come back from your PHP. You're not really using it as a table anyway, a list would probably be more semantic.