Extending list with custom field

Sergio Calleja

Hi everybody,

I want create a scheduling resource application with calendar lists and maintain all its functionality. To do it, I have extended the calendar list with a custom field. This custom field takes the fields value StartDate and DueDate to calculate which resources are free. The problem is that I cannot access to this values in edition mode (the custom field only can access to the field value of the item, not to the control). The only solution I see is include this fields in my custom field, but I can¡¯t use a SPFieldMultiColumnValue because I cannot do queries over the list because it stores field value with the format "column one value#;column two value#;column three value".

Has anyone any idea how solve this problem Any idea will be welcome.

Thanks in advance.

Sergio Calleja.

Ishai Sagi

So I understand you want a box that will show if the resource is free and busy in the "new item" page as the user is entering start date and end date

This is not possible with the built in columns that sharepoint has. You will want to create your own custom field with your own custom control (I suggest a simple button of "Check availability")

Sergio Calleja

Yes, i have extended the list with a custom field, but i don't know how to get date values from my custom control, because i don't know the name of date controls.
How can i get it

Thanks in advance