how to insert php statement into jquery/javascript - php

Question

I am new in php. When user select one of the option in dropdown menu, the list of selected item will shows in textarea form. I want to make each of every item on that list, link to another page. How do I write php/html statement in javascrip/jquery? Here is my javascript :
<script type="text/javascript">
function check(){
var select = document.getElementById('category');
var textarea = document.getElementById('model');
$.ajax({
type: 'POST',
url: 'http://localhost/system/ajax.php',
data: {txt:$('#category').val()},
dataType: 'json',
success: function(resp){
result = resp.success;
textarea.value = "";
for(i=0; i<result.length; i++){
textarea.value = result[i] += "\n" + textarea.value;
}
}
});
}
This is my html code :
<form action="" method="post">
<tr>
<td width="116">Category</td>
<td width="221">
<center>
:
<select name="category" id="category" onChange="check()">
<option>--- Choose Category ---</option>
<?php
mysql_connect("localhost", "root", "");
mysql_select_db("inventory");
$sql = mysql_query("SELECT * FROM equipment GROUP BY equip_category ASC ");
if(mysql_num_rows($sql) != 0){
while($row = mysql_fetch_array($sql)){
echo '<option value="'.$row['equip_category'].'">'.$row['equip_category'].'</option>';
}
}
?>
</select >
</center>
</td></td></tr>
<tr>
<td><p>Model/Brand</p>
<td>
<p align="center">:<textarea name="model" id="model" rows="5" cols="25"><?php echo (''); ?></textarea>
</p>
</td></td>
</tr></form>

Answer 1

To insert PHP into jQuery/JS, use the following syntax:
var phpVar = <?php echo $some_php_var;?>;
console.log(phpVar); //logs $some_php_var
However, oftentimes it is best to just echo jQuery/JS in PHP:
<?php
echo 'var phpVar = '.$some_php_var.';',
'console.log(phpVar);';
?> <!--logs $some_php_var-->

Answer 2

In PHP use $_POST['txt'] to access the value of category that you are passing from Javascript.
Check out this tutorial for connecting PHP-Javascript-MySQL.

Answer 3

this is my ajax.php :-
<?php
if(!empty($_POST)) {
include "connect.php";
$txt = $_POST['txt'];
$query = "SELECT equip_name_desc FROM equipment WHERE equip_category = '$txt'";
$number = 0;
$result = mysql_query($query)
or die(mysql_error());
while($row = mysql_fetch_array($result))
{
$time = $row['equip_name_desc'];
$testarray[$number] = $time;
$number = $number+1;
}
echo json_encode(array('success'=>$testarray));
}
?>
Below is the example of output. I want to make 'Lenovo GGG' or 'HP' is a link to another page. Question is, how to write the href link in javascript?