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Showing content with the highest reputation on 09/30/2021 in all areas
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I was in my fifties when I first came across something called HTML. I knew Basic from from my days with a BBC home microcomputer so I started using Visual Basic to create web pages. Daily, I would log in to the Compuserve Bulletin Board using my dial-up modem to exchange ideas (much like now - plus ca change, plus ca meme). I started to write Java applets to enhance my pages but, no sooner had I started to become reasonably proficient, the world switched to Flash (which has since died a death). Disheartened, I let the Java lapse. One of the biggest mistakes I've made as today's phone apps are essentially Java applets. A year or so later I came across PHP and much prefered its Java/C type syntax to Basic. My preference was cemented when I discovered that rewriting my VB/ASP scripts in PHP gave me a 3x+ speed increase (in one case a 70x increase in performance as VB was crap at handling long string concatenations). Anyway, the moral is "You ain't too old".2 points
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The basics of AJAX are simple. You send a request to be processed on the server and it sends back a response. When responding to an AJAX request, anything output by the server program (stuff that would normally go to the browser screen) is sent back as the response. Here's a simple example (using data from the DB in my tutorial) which accepts a teacher_id, sends it in a request, and recieves back the data for that teacher thne displays it. <?php require 'db_inc.php'; $db = pdoConnect('jointute'); // my cuton connection function - use your connection code //******************** PROCESS AJAX REQUESTS ********************* // // if (isset($_GET['ajax'])) { if ($_GET['ajax']=='teacher') { exit(json_encode(getTeacher($db, $_GET['tid']))); } else { exit('INVALID'); } } // // Functions // function getTeacher($db, $id) { $res = $db->prepare("SELECT t.fname , t.lname , d.deptname as dept FROM teacher t JOIN department d USING (dept_id) WHERE teacherid = ? "); $res->execute([ $_GET['tid'] ]); $row = $res->fetch(); if ($row) { return $row; } else return ['fname'=>'NOT FOUND', 'lname'=>'', 'dept'=>''] ; } ?> <!DOCTYPE html> <html lang='en'> <head> <title>Example</title> <meta charset='utf-8'> <script type="text/javascript" src="https://code.jquery.com/jquery-3.3.1.min.js"></script> <script type='text/javascript'> $().ready( function() { $("#find").click( function() { var tid = $("#tid").val() $.get( "", // specify processing file on server (in this case it's same file) {"ajax":"teacher", "tid":tid}, // data to send in request function(resp) { // handle the response $.each(resp, function(k,v) { $("#"+k).val(v) }) }, "JSON" // response type ) }) }) </script> <style type='text/css'> body { font-family: calibri, sans-serif; font-size: 12pt; } div { margin: 16px; padding: 8px; border: 1px solid gray; } label { display: inline-block; background-color: black; color: white; width: 120px; padding: 8px; margin: 1px 8px;; } </style> </head> <body> <div> <label>Teacher ID (1-20)</label> <input type='number' id='tid' value='0'> <button id='find'>Find</button> </div> <div> <label>First name</label><input type='text' id='fname' value='' readonly><br> <label>Last name</label><input type='text' id='lname' value='' readonly><br> <label>Department</label><input type='text' id='dept' value='' readonly> </div> </body> </html>
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Now it returns 10 again function ec($n, array $a, array $b) { return $n * $b[1] - $b[0] * $a[0] * $a[1] ; } echo ec( 4, [1,3], [2,4]); // 10 If you post this topic again you will be banned.1 point
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