Fetch information from a database with AJAX to use as nav menu

BichenerM · March 11, 2014

I have adapted a script from w3schools to use as a main menu for my site.

It works great in IE, but about 3 or 4 times slower in FireFox, Chrome and Safari!

I have no idea what might be wrong and would appreciate any help.

Many thanks

Mark

<html>
<head>
<script>
function showUser(str)
{
if (str=="")
{
document.getElementById("hoverbar").innerHTML="";
return;
} 
if (window.XMLHttpRequest)
{
xmlhttp=new XMLHttpRequest();
}
else
{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("hoverbar").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","menulookuptest.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<div class='divcolor1' onmouseover='showUser("1")'>Option 1</div>
<div class='divcolor2' onmouseover='showUser("2")'>Option 2</div>
<div class='divcolor3' onmouseover='showUser("3")'>Option 3</div>
<div class='divcolor4' onmouseover='showUser("4")'>Option 4</div>
<div class='divcolor5' onmouseover='showUser("5")'>Option 5</div>
<div class='divcolor6' onmouseover='showUser("6")'>Option 6</div>
<div class='divcolor7' onmouseover='showUser("7")'>Option 7</div>
<div class='divcolor8' onmouseover='showUser("8")'>Option 8</div>

<div id="hoverbar">Content Goes Here</div>
</body>
</html>

menulookuptest.php

<?php
$q = $_GET['q'];
$con=mysqli_connect("localhost","root","PASS","DBNAME");
mysqli_select_db($con,"ajax_demo");
$sql="SELECT pagetitle, pagedept FROM intranetpage WHERE pagedept = '".$q."'";
$result = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($result))
{
echo $row['pagetitle'];
echo "<BR>";
}
?>

jakekoekemoer · March 11, 2014

I would suggest you start by looking at AJAX to do that. Something to the effect of:

<script>
    function showUser(str) {
        if (str == "") {
            $("hoverbar").innerHTML = "";
            return;
        }

        var postrequest;

        postrequest = $.post("menulookuptest.php", {q: str}).done(function () {
            $("hoverbar").innerHTML = result;
            return;
        }).fail(function () {
            alert("an error occured");
        })
    }
</script>

as far as the php code goed its a good idea to rather do it like this:

<?php
$q = $_GET['q'] or die('REQUEST NOT HANDLES');

$con = mysqli_connect("localhost", "root", "PASS", "DBNAME") or die('CANNOT CONNECT TO DB');

mysqli_select_db($con, "ajax_demo") or die('DATABASE NOT SELECTED');

$sql = "SELECT pagetitle, pagedept FROM intranetpage WHERE pagedept = '" . addslashes($q) . "'";

$result = mysqli_query($con, $sql);

$finalstring = '';

while ($row = mysqli_fetch_array($result)) {
    $finalstring .= $row['pagetitle'].'<br>';
}
die($finalstring);

?>

As far as the code goes I cant see what could make it take long, make your javascript load async. I would even go as far as using ajax for the hover events of the div using

$("id").hover(function(){
    showUser("id");
})

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Fetch information from a database with AJAX to use as nav menu

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