Display red banner on top of the form with some text

[profile]

Develop a custom checkbox field called “Flag for Review” on Incident. When checked: Show a red banner at the top of the form: "This Incident is flagged for managerial review".

How to show a red banner on the top of incident form when a checkbox has been to checked.

I have tried with UI macros + formatter and Ui policy but not working and also with client script not working.

we should not use addinfomessage() method and can't able to use html directly in client script.

Please, some one help me out.

[Mark Manders]

Why shouldn't you use 'addInfoMessage' (or 'addErrorMessage', for that matter)? Use it and you are done. 

[profile]

Can we use addInfoMessage or addErrorMessage as per the requirement. Since, it need to show on top of the banner of a form.

[Mark Manders]

Yes. That will show the message at the top. If you use field message it will show on the field.

[Deepak Shaerma]

Hi @profile 

You have create a new onChange client script, change the field name 

function onChange(control, oldValue, newValue, isLoading) {
  if (isLoading)
    return;

  g_form.clearMessages();

  if (newValue == 'true' || newValue === true) {
    g_form.addErrorMessage('This Incident is flagged for managerial review');
  }
}

Result on check the field :

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Thanks & Regards 
Deepak Sharma