1. It will return TRUE if it does not and if it contains a value, this function returns FALSE. If you want to make the Rich Text Field Mandatory in Salesforce.com by a Validation rule then ISNULL, ISBLANK functions will not work.You will require to use the LEN (Length) Function and make sure the validation rule looks like IF LEN (Rich Text Field) == 0 then fire the Validation Rule I’m not gonna lie – I stole a lot of mine from the Help & Training. In Salesforce formula editor, there are two functions: ISBLANK() and ISNULL(). A Validation Rule is a rule on a field which verifies that data entered by a User meets a certain criteria, beforethe User can save the record. Thanks You can find many, many more here. How to call Apex class in trigger in Salesforce? Salesforce will continue to support ISNULL, so you do not need to change any existing formulas. To check whether a Rich Text Area field is empty, use the LEN function. Validation Rule Example: NOT (ISPICKVAL (Status, ’New’)) && Using ISBLANK or ISNULL with a Rich Text Area field always returns true when used in a Validation Rule. Difference between isBlank() and isNull(): Both determines expression has a value it returns true, if does not contains a value it returns false. Validation rules are just not my strong suit. Now let’s create a validation rule to verify that whenever the opportunity stage is changed to ‘Closed Lost’, a user must specify the reason for the lost. Javascript to select all checkboxes in visualforce page? ISBLANK() works with the following field's type: Limit! Syntax: ISNULL(expression) Replace expression with the expression you want evaluated. The question here is, which is the correct one… Custom validation rules, duplicate rules, and escalation rules are not run again." Workflow Rules will be helpful to update the same o... Visualforce page:                    ... To determine if an expression has a value or not, you can use ISBLANK() function in Salesforce. ISNULL and ISBLANK don't work with this field type, period. How can I adjust my formula to check if Account Name (standard account field on Case) and Sales Dist (lookup to a custom object) are both blank on the case? A field is not empty if it contains a character, blank space, or zero. LEN (Rich_Text_Field__c) = 0 For example, a field that contains a space inserted with the spacebar is not empty. ... n.b. How can this be added? It will return TRUE if it does not and if it contains a value, this function returns FALSE. Would this validation rule apply to the API user? I’m trying to set up a validation rule for Accounts that would make 4 fields required based on the picklist value of another field. ISBLANK () has the same functionality as ISNULL (), but also supports text fields. ISBLANK has the same functionality as ISNULL, but also supports text fields. To determine if an expression has a value or not, you can use ISBLANK() function in Salesforce. So, it's either correct format or none at all. It will  returns TRUE if it does not and if... trigger sample on Account (before insert) {     for(Account a : trigger.New)     {         sampleRest s = new sampleRest();     } } Samp... Before Trigger: In case of validation check in the same object. So if you have VR like this: LEN(richText__c) = 0. I have a custom date field and if the field does not have a null value i then want to check that the date in that field is not less than the opportunity created date. September 4, 2015 Like This function is available only in validation rules, field updates, workflow rules, assignment rules, and processes. I'm trying to validate to allow either field1 and field2 both be populated or both be blank. A field is not empty if it contains a character, blank space, or zero. 2. 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