Google Apps Hacks

180 GOOGLE APPS HACKS

used this way, and of course you can also create your own HTML le to be displayed here. Instead of

HTML, you can also show an image; to do so, replace the value for X-GOOGLE-CALENDAR-CONTENT-URL with

the image URL, and instead of the content-type text/html, use (for example) image/gif.

Let’s see what this will now look like in Google Calendar! Log in to your calendar and open the Add drop-

down that appears above the list of your calendars. Select Add by URL and enter your calendar’s full URL

(remember, you must have saved the le in iCal format and uploaded it to a server somewhere). After

clicking Add and then the OK button and waiting a few seconds for Google to load and display your le,

you will see the icon on top of a day in the calendar default display. Click on the icon, and it expands to

showcase the content from the URL you specied, as shown in Figure 7-21.

Google caches the iCal le that you provide to it. If you are still testing your calendar and you make changes to

the iCal le, you can upload it under a new lename, like my2.ical instead of my1.ical. You can also append an

arbitrary parameter to the URL, like “my.ical?v=2”, to make sure that Google won’t be accessing its old copy

of your le. Note, however, that Google does not cache web pages that you link to in the iCal le—such as the

URL of the game shown earlier—so you may want to implement ...