Non-web links and protocols Web Designing

Linking to other web pages using the HTTP protocol is by far the most common type of link, but there are several other types of transactions that can be made using other standard Internet protocols.

Mail Link (mailto:)
The mailto protocol can be used in an anchor tag to automatically send an email message to the recipient, using the browser's email application or an external email application. Note that the browser must be configured to support this tag, so it will not work for all users. The mailto protocol has the following components:

mailto:[email protected]

You can also experiment with adding information within the mailto URL that automatically fills in standard email fields such as Subject or cc:. As of this writing, these additional functions are supported only by Navigator 4.0 and higher, Internet Explorer 5 (Mac), and Internet Explorer 5.5 (Windows), so use them with caution and do lots of testing:

mailto:[email protected]?subject=subject mailto:[email protected]?cc=person1 mailto:[email protected]?bcc=person2 mailto:[email protected]?body=body

Additional variables are appended to the string with an ampersand (&) symbol as follows:

mailto:[email protected]?subject=subject&cc=person1&body=body

Spaces within subject lines need to be written as %20 (the space character in hexadecimal notation). The following is a sample mail link employing these additions:

<A HREF="mailto:[email protected]?subject=Like%20your%20book">Email for Jen</A>

WARNING
A word of warning: when you put a link to an email address on a web page, the address is prone to getting "spidered" (automatically indexed) and added to spam mailing lists. If you don't want to risk getting junk email, keep the email address off the site.

FTP Link (ftp://)
You can link directly to a file on an FTP server. When the user clicks on the link, the file downloads automatically using the browser's built-in FTP functions and is saved on the user's machine. If the document is on an anonymous FTP server (i.e., no account name and password are required), the FTP link is simple:

<A HREF="ftp://server/pathname">...</A>

To link to an FTP server that requires the user to log in, the format is:

<A HREF="ftp://user:[email protected]/pathname">...</A>

For security purposes, it is highly recommended that you never include both the username and password to a server within an HTML document. If you use the syntax [email protected]/path, the user will be prompted to enter his or her password in a dialog box.

By default, the requested file is transferred in binary format. To specify that the document should be transferred as an ASCII file, add ;type=a to the end of the URL:

<A HREF="ftp://user:[email protected]/pathname;type=a">...</A>

The variable type=d identifies the pathname as a directory and simply displays its contents in the browser window. type=i specifies image or binary mode, which is the default but may also be given explicitly. Following are some examples of FTP links:

<A HREF="ftp://[email protected]/program.exe">...</A>

Other Links
The following URL types are not as well known or useful as mailto or ftp://, but they are available. As with other links, place these URLs after the HREF attribute within the anchor tag.

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Other LinksNon-web links and protocols



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