How to post data (form) without page refresh PHP, jQuery, Ajax - php

Question

Please help me how to submit form (comments) without page refresh for
HTML markup:
<form id="commentf" method="post">
<img width="40px" height="40px" src="uploads/<?php echo $row['photo']; ?>">
<textarea class="textinput"id="comment" rows="1" name="comments" placeholder="Comment Here......"></textarea>
<button type="submit" id="comq"name="compost" class="butn2">post comment</button>
</form>
PHP code (pnf.php):
if(isset($_POST["compost"]))
{
$comment=$_POST['comments'];
{
$reslt_user= mysqli_query($connection,"SELECT * FROM tbl_users,`queries` where id='".$_SESSION['id']."' AND qid= '".$qid."' ");
$row_lat_lng= mysqli_fetch_array($reslt_user);
$stmt = mysqli_query($connection,"INSERT INTO comments set uid='".$_SESSION['id']."',comments='".$comment."',reply='".$reply."' ,
qid= '".$qid."' ");
}
if($stmt)
{
echo "hello world";
}
}
jQuery and Ajax:
$(document).ready(function()
{
$("#comq").click(function() {
var comment=$("#comment").val();
$.ajax({
type: "POST",
url:"pnf.php",
data: {
"done":1,
"comments":comment
},
success: function(data){
}
})
});
});
I have tried many times and don't know what mistake I made, Ajax and jQuery are not working, please anyone help - thanks in advance

Answer 1

You have made couple of mistakes.
First:: You should put button type="button" in your HTML form code
Second:: You have made a syntax error. $("#comment").vol(); should be replaced with $("#comment").val(); in your jQuery AJAX

Answer 2

As you mentioned that you have to send request without refreshing page I modified your JS-code with preventing default submitting form:
$(document).ready(function () {
$("#commentf").submit(function (e) {
e.preventDefault();
var comment = $("#comment").val();
$.ajax({
type: "POST",
url: "pnf.php",
data: {
"done": 1,
"comments": comment
},
success: function (data) {
}
})
});
});

Answer 3

Javascript
$('form').on('submit', function(event){
event.preventDefault();
event.stopPropagination();
var dataSet = {
comment: $('#comment').val();
}
$.ajax({
url: "link.to.your.api/action=compost",
data: dataSet,
method: 'post',
success: function(data){
console.log('request in success');
console.log(data);
},
error: function(jqXHR) {
console.error('request in error');
console.log(jqXHR.responseText');
}
});
});
PHP
$action = filter_input(INPUT_GET, 'action');
swicht($action){
case 'compost':
$comment = filter_input(INPUT_POST, 'comment');
{
$reslt_user= mysqli_query($connection,"SELECT * FROM tbl_users,`queries` where id='".$_SESSION['id']."' AND qid= '".$qid."' ");
$row_lat_lng= mysqli_fetch_array($reslt_user);
$stmt = mysqli_query($connection,"INSERT INTO comments set uid='".$_SESSION['id']."',comments='".$comment."',reply='".$reply."' ,
qid= '".$qid."' ");
}
if(!$stmt)
{
http_response_code(400);
echo 'internal error';
}
echo 'your data will be saved';
break;
default:
http_response_code(404);
echo 'unknown action';
}
you have to prevent the submit on the form (look in javascript).
after that you send the request to the server and wait for success or error.
in php try to do it with a switch case. and try to not touch super globals directly, use filter_input function.
hope this helps

Answer 4

Modified JQuery Code...
$( document ).ready(function() {
console.log( "ready!" );
$("#comq").click(function() {
var comment=$("#comment").val();
console.log('comment : '+comment);
$.ajax({
type: "POST",
url:"pnf.php",
data: {
"done":1,
"comments":comment
},
success: function(data){
}
})
});
});
HTML Code
<form id="commentf" method="post">
<textarea class="textinput" id="comment" rows="1" name="comments" placeholder="Comment Here......"></textarea>
<input type="button" id="comq" name="compost" class="butn2" value="Post Comment">
</form> </div>

Answer 5

<form id="commentf" method="post">
<img width="40px" height="40px" src="uploads/<?php echo $row['photo']; ?>">
<textarea class="textinput"id="comment" rows="1" name="comments" placeholder="Comment Here......"></textarea>
<button type="button" id="comq"name="compost" class="butn2">post comment</button>
</form>
script
$(document).ready(function()
{
$("#comq").click(function() {
var comment=$("#comment").val();
$.ajax({
type: "POST",
url:"pnf.php",
data: {
"done":1,
"comments":comment
},
success: function(data){
}
})
});
});
PHP code (pnf.php):
comment=$_POST['comments'];
$reslt_user= mysqli_query($connection,"SELECT * FROM tbl_users,`queries` where id='".$_SESSION['id']."' AND qid= '".$qid."' ");
$row_lat_lng= mysqli_fetch_array($reslt_user);
$stmt = mysqli_query($connection,"INSERT INTO comments set uid='".$_SESSION['id']."',comments='".$comment."',reply='".$reply."' ,
qid= '".$qid."' ");
if($stmt)
{
echo "hello world";
}

Answer 6

if you are using jquery make sure to include jquery libraries before your script file.
latest jquery cdn minified version
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
example
<script src="https://code.jquery.com/jquery-3.2.1.min.js" type="text/javascript"></script>
<script src="yourjsfile.js" type="text/javascript"></script>