Check for text in a text field and make checkbox mandatory

I have a text field where if the user has entered a value, then the checkbox that follows must be mandatory. I have this script that works (sort of), but I'm not sure which event to use to get the results I want. I want the message and the checkbox to be mandatory only if something is typed in the field.
Here's the script:
if ((this.rawValue != "null") || (this.rawValue != ""))
     CheckBox3.mandatory = "error";
     app.alert("Please indicate that you have reviewed the similar profile and approve it");
else if ((this.rawValue == "null") || (this.rawValue == ""))
     CheckBox3.mandatory = "disabled";
Thanks,
MDawn

That worked. Thank you. I have another problem now. If the user deletes the information typed in the text field, the message box still displays and the checkbox is still outlined in red indicating it's required and it shouldn't be.
Thanks,
MDawn

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Check for text in a text field and make checkbox mandatory

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