Use Javascript to parse a URL address entered into a textbox into its component parts (protocol, port, domain and subdomain, path, and a list of parameters - both parameter name and values). The URL entered should be displayed as a clickable link (use the < a> tag, and href attribute, though you may need to add information if the URL is not already well-formed.) (Use the Javascript to create the table. You will probably want to create helper methods such as writeCell (an individual data item preceded by < td> and followed by < /td>), writeRow (write several cells based on the passed arguments preceded by < tr> and followed by < /tr>). For example, if the following URL is typed into the textbox
http://venus.cs.qc.cuny.edu/~lteitelman/cs355/myPage.html?name=Lawrence&title =instructor&building=Kiely
The table might look something like this:
| Description | Entry | Additional Information | Source |
| Protocol | http | HyperText Transfer Protocol | Provided |
| Port | 80 | Default | |
| Full Address | venus.cs.qc.cuny.edu | Corresponding IP address (extra credit) | Lookup |
| Top-Level Domain | edu | Provided | |
| Domain Name | cuny.edu | Provided | |
| Subdomain Name | venus.cs.qc | Provided | |
| Path | ~Iteitelman/cs355/connected.php | Provided | |
| Parameter #1 | name | Value is "Lawrence" | Provided |
| Parameter #2 | title | Value is "instructor" | Provided |
| Parameter #3 | building | Value is "Kiely" | Provided |
You should be mindful or URLs that do not include all components (keep in mind that the number of segments in a domain must be at least 2 but arbitrary large, while the number of parameters can be 0 or arbitrarily large.) The code should make assumptions about reasonable defaults where appropriate (http where no protocol is provided, and the default port that usually goes with a protocol when the port itself is unspecified). Issue a meaningful error when the URL is so poorly formed that it cannot be parsed.