Harvard Extension School
CSCI E-12 Fundamentals of Web Site Development | Spring 2020

## Adding another view - Department Course Listings

Create another PHP file that displays course information based upon a department_code parameter.

- `courses.php` - take a "department_code" parameter and produce alist of courses for that department.

Need to link to to courses.php:

- courses.php?department_code=CHEM
- courses.php?department_code=MCB

Modify the department listing to include the hyperlink:

    <!DOCTYPE html>
    <html>
     <head>
      <title>Departments</title>
      <link rel="stylesheet" href="site.css" type="text/css"/>
     </head>
     <body>
    <h1>Faculty of Arts &amp; Sciences</h1>
    <h2>Departments</h2>
    <?php
    // Connecting, selecting database
      $mysqli = new mysqli('localhost','class','cscie12','coursecatalog');
      if ($mysqli->connect_errno) {
          echo "Failed to connect to mysql: ".$mysqli->connect_errno." ".$mysqli->connect_error;
      }

    // Performing SQL query
    $query = 'SELECT distinct department_short, department_code FROM courses order by department_short';
    $result = $mysqli->query($query);

    // Printing results in HTML
    echo "<ul>\n";
    while ($row = $result->fetch_assoc()) {
      echo "<li>";
      echo "<a href=\"courses.php?department_code=$row[department_code]\">$row[department_short]</a>";
      echo "</li>\n";
    }
    echo "</ul>\n";

    // Free resultset
    $result->free();
    // Close connection
    $mysqli->close();

    ?>

    </body>
    </html>

Copyright © David Heitmeyer