单击链接PHP时激活Javascript

I have a link in HTML/PHP, and on the click event, I want JavaScript/Jquery code activated/executed:

PHP/HTML:

echo "<a id='kodelinka' class='linknew' href=''>$kd_mrp</a>";

JavaScript:

<script type="text/javascript">
$('#kodelinka').click(function(){        
    var value = "bbbb";
    alert("aaaaa");
    $('#kodelink').fadeOut();
});
</script>

How do I activate the script?

Try like

echo "<a id='kodelinka' class='linknew' href='javascript:;'>$kd_mrp</a>";

You need to prevent the anchor tag default action.Also you can do like

$('#kodelinka').click(function(e){        
    e.preventDefault();

Makesure your script is working in your page

try to make href to go js

echo "<a id='kodelinka' class='linknew' href='javascript:void(0);'>$kd_mrp</a>";

For the PHP part, you can use either

<?php echo "<a id='kodelinka' class='linknew' href=''>$kd_mrp</a>"; ?>

or if you want to have the in the html

<a id='kodelinka' class='linknew' href=''><?php echo $kd_mrp; ?></a>

Now for the javascript part

<script type="text/javascript">
$('#kodelinka').click(function(){        
    var value = "bbbb";
    alert("aaaaa");
    $('#kodelink').fadeOut();
});
</script>

Incase if you didn't know, you need to have jquery for the alert function

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>

here is 3 samples:

<a href="####"></a>
<a href="javascript:void(0)"></a>
<a href="javascript:void(null)"></a>

don't use href=''