onclick on DIV, load content from database on other div

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My concept is to load contents of a div on other div in html. In short I want to learn how the new Facebook inbox works, when we click on a message on the right, the contents a

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自闭症患者

2021-01-28 13:50

if you are using jquery you can use onclick event on a div.

This is the HTML/JS this work like this.

<!doctype html>
<html>
    <head>
        <title>Document Title</title>
        <script src="http://code.jquery.com/jquery-1.8.2.min.js"></script>
        <script>
            $('.clickable').on('click', function(){
                var data_id = $(this).data('id');
                $.ajax({
                    url: 'ajax.php',
                    type: 'POST',
                    data: {id: data_id},
                    dataType: 'json',
                    success: function(data){
                        $('#more-info').html(data.html);
                    },
                    error: function(jqXHR, textStatus, errorThrown){
                        $('#more-info').html('');
                        alert('Error Loading');
                    }
                });
            });

            });
        </script>
    </head>
    <body>
        <div id="item-one" class="clickable" data-id="123">Click me</div>
        <div id="item-two" class="clickable" data-id="456">Click me</div>
        <div id="more-info"></div>
    </body>
</html>

and let say we have a PHP file named ajax.php will return a json like we especified before in the ajax function dataType: 'json' and we are sending an ID through POST so here are a example you have to work it on it.

ajax.php

<?php
$id = (int)$_POST['id'];
$query = "SELECT * FROM messages WHERE message_id = {$id} LIMIT 1"; //expecting one row
$result = mysql_query( $query );
$message = mysql_fetch_assoc( $result ); //expecting just on row

$json = array();
$json['html'] = '<p>' . $message . '</p>';

header('Content-Type: application/json');
echo json_encode( $json );
?>

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