Change text area content using AJAX - php

Question

Newbie in AJAX here, I want to requery or select *from again on my database on button click and change the textarea content? How do I do that using AJAX.
Here is my code.
<textarea id="CKUPDATEALL">
<?php
$result = mysqli_query($con,"SELECT *FROM home WHERE ANNOUNCE_TYPE='WELCOMENOTE' ORDER BY ANNOUNCE_NUMBER DESC limit 0,1");
while($row = mysqli_fetch_array($result))
{
echo $row['ANNOUNCEMENTS'];
}
?>
</textarea>

Answer 1

No you can set your php file to check against different variables being passed in the Ajax call. The in the Ajax response success look for the different variables that were defined in the php file. So you might call Ajax.php for 10 different Ajax calls and responses. Just have to set it up properly.
$(document).ready(function(){
$("#my_button").on('cick',function(){
Var name = $('#thisinputid').val();
$.ajax({
url: "getval.php",
type: "POST",
data : { fullname : name },
success: function(data) {
$("#CKUPDATEALL").val(data);
}
});
});
Then in the php file check for $_post['fullname'].

Answer 2

Say this is your button
<input type="button" id="my_button" value="Cick"/>
Ajax
$(document).ready(function(){
$("#my_button").on('cick',function(){
$.ajax({
url: "getval.php",
type: "POST",
data : {'type':'textarea'},
success: function(data) {
$("#CKUPDATEALL").val(data);
}
});
});
And in getval.php
<?php
if(isset($_POST['type']) && trim($_POST['type']) == 'textarea'){
$result = mysqli_query($con,"SELECT * FROM home WHERE ANNOUNCE_TYPE='WELCOMENOTE' ORDER BY ANNOUNCE_NUMBER DESC limit 0,1");
while($row = mysqli_fetch_array($result)){
echo $row['ANNOUNCEMENTS'];
}
die();
}
?>

Answer 3

Try $.ajax() like,
$(function(){
$.ajax({
url:'get_announcement.php',
type:'POST',
data:{type:'announcement'},
success:funtion(d){
$('#CKUPDATEALL').val(d);
}
});
});
get_announcement.php
<?php
// type is announcement
if(isset($_POST['type']) and $_POST['type']=='announcement'){
$result=mysqli_query($con,"SELECT * FROM home WHERE
ANNOUNCE_TYPE='WELCOMENOTE' ORDER BY ANNOUNCE_NUMBER DESC limit 1");
while($row = mysqli_fetch_array($result)){
echo $row['ANNOUNCEMENTS'];
}
echo 'not found';
}
?>