比较SharePoint列表中的两个int列

Question

I´m doing a course catalog app for sharepoint. And i have a list called Courses. in that list i have two columns called: seats and FreeSeats. When you make a new course the boss decide how many can apply to the course. So for ex: 5 seats. When the Fifth person apply there most be a stop. So i thought if i have the column FreeSeats, it can count up everytime someone apply. And when it is the same as the column Seats it will NOT be able to apply. So i guess i need some sort of count that add 1 everytime someone apply to the FreeSeat column. And in a if loop check if the value of freeSeats are smaller than Seats, you can apply. If its bigger than Seats it will come a stop message.

Someone have any idea how a code like this looks like? I have never done this before.

Answer 1

Since your new to this I would advise you go through this MSDN tutorial.

It outlines how you would do some basic CRUD functionality in a SharePoint app.

You can then adapt it for your particular purpose. This is how I started out :) good luck. Ignore the fact it mentions Napa the app structure should be similar in VS

MSDN SharePoint CRUD in App

Cheers

Truez

Answer 2

You can actually set this up without any code by creating a list of Free Seats with Titles ranging from 1 to #. In your signup lists you would create a lookup column for each course that points to the corresponding list of free seats and select the "Enforce unique values" option. That way, when a user signs up for the course, they must select one of the free seat values you have created, and cannot sign up for a value selected previously. You can use a workflow to update a list elsewhere to give you your signup counts for tracking if you wish.

To do this programmatically you would need a workflow or event receiver that counted the total number of list items with a Free Seats value selected and then remove the contribute rights for the list that people are using to signup. There is no other way to stop people from adding a new item once your quota is satisfied.