Restrict IFrame from Rich Text Editor field

Tested on Sitecore 10.3 and 10.4.

In this blog post, I cover steps to raise a validation error in a rich text field that has an Iframe tag since IFrame might be a bad practice to use in certain organizations. The process involves the following steps:

1. Create a validation rule

2. Ensure that the validation rule fires on CE save/publish button click

3. Strip-off the iframe tags since RTE will still have the entry

The approach here is to raise a validation error on the concerned field. So, here is the c# code:

First, create an RTE IFrame Validation Rule:

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Config patch:

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Next, Validate Before save button click:

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Associated config:

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Strip IFrame tags in RTE config:

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Associated C# code:

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Github: 

Clone the Github repo. Since it is a .net framework 4.8 project, open the project with VS 2022 Community edition, build the dll and deploy the dll to bin folder while config files must be deployed to app_config\include\zzz folder.

VS 2022 sln structure for reference:

Create validation rule as follows in Sitecore or install the Sitecore package:

/sitecore/system/Settings/Validation Rules/Field Rules/RTEIframeValidationRule

Also, for the above item, set type to the assembly/namespace/class name. For the current code setup it is - SitecoreValidation.Validators.RTEIframeValidationRule, SitecoreValidation

Assign rule to template (manually):

In template validation rules for the concerned field, set the RTEIframeValidationRule rule in all the fields - 

Workflow, Validator Bar, Quick Action Bar, Validate Button

Assign rule to template (via PS script):

Pre-requisite: the Sitecore validation rule

SPE installed in the instance

SPE script that bulk applies the rule for RTE in a given template path:

PS Script end-result:

Validation rule applied to field end-result:

Demo: