Is your question:
a) how to generate a calendar of the current month
b) how to display the documents for the selected day when clicking on the link in the calendar?
If b), it is not very hard. Look up RestrictToCategory in the online help, that is a URL argement that will display only the specified category from a categorized view. Encapsulate this view using a $$ViewTemplate.
Depending on how you create the link in the calendar, you could either have a regular HTML link, or use onClick to open the view. Or even use jQuery.
I would just create a simple Lotusscript agent, which when called generates the HTML -- including links/code described in b) above -- and return it to the calling page.
Just create a HTML table, 6 rows with 7 columns in each. Then populate the table with dates in the correct locations. I would give each table cell it's own unique ID (for easy addressing), for exampel the date in the same format that you use in your categorized view. Then it is very easy to use jQuery to read the ID and call the Domino view using that date as RestrictToCategory value.
Small Monthly Calendar on Web (Andy Herlihy 26.Nov.12)
Feedback response number WEBB92EPQV created by Karl-Henry Martinsson on 11/26/2012
. . What part is your question about? (Karl-Henry Mart... 26.Nov.12)
. . . . More to do with generating a calend... (Andy Herlihy 27.Nov.12)
. . . . . . Links... (Karl-Henry Mart... 27.Nov.12)
. . . . . . Use Dojo (Carl Tyler 27.Nov.12)
. . . . . . . . Or jQuery... :-) (Karl-Henry Mart... 28.Nov.12)