If you want to perform action whenever the value of a field is modified, you can write an on update script for that field. The on update script is executed after the changed data is persisted in the database.
// specify deluge code to be executed
Let us take the example of a Feedback Application form. In the below sample, whenever the status of a feedback is updated as Closed, a mail will be sent to the person who had reported it.
if (input.Status == "Closed")
From : zoho.adminuserid
To : input.Your_Email_Address
Subject : "The feedback you had sent has been incorporated in zohocreator"
Message : "The details are as below" + "Category " + input.Feedback_Category
+ "" + "Comments " + input.Comments