How do I blank a field from a Business Rule or Script Include..?

[DarkAvenger]

Hi all

I have been trying to create a Business Rule or a Script Include that is executed from a Reference Qual attribute on a reference field.

Besides returning the query this code should also set another (related) field to blank when-ever it is executed. The point with this is mainly to set that other field (also a reference field) to blank every time the user clicks on the magnifier on the reference field (this is a requirement from the users).

My problem is that I am having a problem finding the right syntax for setting the field to blank.

I have e.g. tried a simple expression like this one below, on both a Business Rule and Script Include:

     current.u_location = '';

(the field that should be set to blank is called u_location and it is a reference field)

Besides that I have tried g_form.clearValue('u_location') and also constructions like this:

     var uLocBlankVal;
     g_form.setValue('u_location', uLocBlankVal);

(the idea with above script is to set the field value to an undefined variable, as explained here: https://wiki.servicenow.com/index.php?title=Resetting_Reference_Fields)

None of these have so far set the u_location field to blank, however.

Is field blanking even possible from a Script Include or a Business Rule?

TIA

[randrews]

i agree with the previous poster to acomplish something similiar i used an on change client script with the line

g_form.clearValue('v_server_patching');

and it worked fine... is there a reason it has to be a BR or a script include?

If i understand correctly a BR runes when it loads/updates the database.. so won't take affect till they try to save the record.. and a script include wouldn't run after it was loaded either.

[Miguel Caldero3]

It sounds to me that you want to do this on client script. The idea will be when they make a change to a field then the other one gets clear out.

[DarkAvenger]

There was actually an onChange Client Script for the field and I was able to modify that to clear the other field.

[billi_lumley]

Hi! I have a question in regards to clearing a value. I've created a UI Policy to clear the contents of a field based on a condition. Works great, however if the condition is then reversed (i.e., state changes BACK to New), then the contents reappear. Is there a way to clear the contents and keep it that way even if the condition was reversed?

State changes to Complete
function onCondition() {
g_form.clearValue('u_sensitive_data');
}

State change back to New from Complete
The data reappears.