TreeNode handler (CustomTreeNodeHandler class)

The CustomTreeNodeHandler class allows you to execute custom actions when a document (TreeNode) is created, updated or deleted. It's useful if you need to synchronize changes to external systems, generate off-line version of the document in PDF, etc.

It handles the following events:

•	OnBeforeInsert

•	OnAfterInsert

•	OnBeforeUpdate

•	OnAfterUpdate

•	OnBeforeDelete

•	OnAfterDelete

•	OnBeforeMove

•	OnAfterMove

•	OnBeforeCopy

•	OnAfterCopy

Example

The following example shows how to handle the OnAfterInser event and send the newly added news item by e-mail:

1.	Open the CustomTreeNodeHandler class and put the following code at the beginning of the file. It adds the reference to the namespaces we will use to handle the event:

[C#]

using CMS.TreeEngine;

using CMS.GlobalHelper;

using CMS.EmailEngine;

2.	Put the following code inside the OnAfterInsert method. [C#]

// type the document as TreeNode

TreeNode newsDoc = (TreeNode)treeNodeObj;

// handle the event only for news items

if (newsDoc.NodeClassName.ToLower() == "cms.news")

{

// get content of the inserted news item and send it by e-mail

EmailMessage email = new EmailMessage();

email.From = "admin@domain.com";

email.Recipients = "admin@domain.com";

email.Subject = ValidationHelper.GetString(newsDoc.GetValue("NewsTitle"), "");

email.Body = ValidationHelper.GetString(newsDoc.GetValue("NewsSummary"), "");

EmailSender.SendEmail(email);

}

3.	Set the From and Recipients e-mail addresses to you e-mail address.

4.	Compile and run the project. Create a new document of type News. You should receive the e-mail message with it text.