Validate VMName / Hostname in input field before execution of workflow

I'm trying to understand if it is possible to validate the input fields before you run a workflow. The scenario I have is commissioning a new virtual machine. The user must enter the VMname both host name before sending the workflow. I have a couple of actions which will check to see if a VMname or host name is already in use. I want to be able to go is to stop the user to submit the workflow for execution, if the name entered already exists. Is it possible that I can do this?

Thank you

If the action returns an empty (or null), this is considered a successful validation.

Any non-empty string is considered to be the validation failed, and the string value is displayed as the error message in the presentation of the Workflow Wizard.

(If your action return type is not a string but something else, and you do not change, you can build expression OGNL in the property editor for custom validation, which will compare the result of GetAction () .call () with the desired value and return an empty string or string of the error message.)

Tags: VMware

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