how to pop up a message right above the "Follow up Date" field in a PTASK when the field is updated

[sai charan7]

Hi can anyone help me with how to pop up the message above the field when the field is updated,

A message pops up right above the "Follow up Date" field in a PTASK when the "Follow up Date" is updated

Message: "Please contact Problem Management to modify the due date"

[Vasantharajan N]

You can try using the field message 

Syntax:- g_form.showFieldMsg('impact','Low impact not allowed with High priority','error');

docs link :  https://docs.servicenow.com/en-US/bundle/tokyo-application-development/page/script/useful-scripts/re...

[sai charan7]

i have written on change client script but its not working,

 i have to display a pop up only when follow up date is getting chnaged.

here is the code:

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
//if (isLoading || newValue === '') {
// return;
//}
var ab=g_form.getValue('follow_up');
if(ab==''){
g_form.showFieldMsg("follow_up","Please contact Problem Management to modify the due date","error");
}


}

[Vasantharajan N]

Simply try this one to show message on the follow up field.

Note: I've not checked for the new record condition if required you can add it

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
   if (isLoading || newValue === '') {
      return;
   }

   g_form.showFieldMsg("follow_up","Please contact Problem Management to modify the due date","error");
   
}

Adding result screenshot for reference,

[sai charan7]

hi thanks,

iam getting alert but he is able to change to new value which i dont want to change it