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How to parse the RecurrenceRule at server side?

Platform: ASP.NET MVC - EJ 2 |
Control: Schedule

This knowledge base article explains the way to parse the recurrence rule at server side by making use of a new generic utility class RecurrenceHelper.


By referring to the RecurrenceHelper class in your sample project, you can make use of the GetRecurrenceDateTimeCollection method which automatically generates the date instances as a result. Below 4 type parameters can be passed to GetRecurrenceDateTimeCollection method.


Type 1: Recurrence rule and start date value (Mandatory parameters).

In this type, we need to pass two mandatory arguments such as recurrence rule and recurrence start date. 


Type 2: Maximum number of occurrences to retrieve. 

In this type, we can pass the maximum occurrences count (ex: 60) to be retrieved when “Ends Never” option is present in the recurrence. By default, the Ends never maximum count is processed as 43.


Type 3: RecurrenceException.

In this type, we can pass the RecurrenceException date (ex: "20180610T040000Z") for excluding the dates along with mandatory arguments.


Type 4: Maximum number of occurrences to retrieve and RecurrenceException.  


In this type, we can pass the RecurrenceException for excluding the dates (ex: "20180610T040000Z") and the maximum occurrence count (ex: 60) for the “Ends Never” option, with the mandatory arguments.  



The following steps explains the way to parse the Recurrence Editor control’s recurrence rule using RecurrenceHelper utility class.


Step 1: Create an MVC application with Recurrence Editor by referring the following user guide link.


Also, define the Change client-side event as shown in the following code example.


Step 2: Within the Recurrence Editor Change event, the selected recurrence rule is sent to the getDates controller function as shown in the following code example.


Step 3: In getDates controller function recurrence rule is parsed using GetRecurrenceDateTimeCollection method and date collections are returned as shown in the following code example.



Step 4: Run the sample, initially Recurrence Editor is displayed as shown in the following image.


      Figure 1: Default Recurrence Editor.


When the rule is changed to Daily, corresponding date collections will be displayed as shown in the following image.


     Figure 2: Recurrence Editor with Daily rule and its corresponding date collections.


Please refer the example and recurrence helper class file from the following GitHub links.

Example - Recurrence Parser

Class file - Recurrence Helper


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