Working as expected in desktop level and facing issue in portal level

[sontam lavanya]

Hi All,

I am new to ServiceNow, can you please help me on this issue.

My scenario is if the location field value is selected empty or if selected any value below functionality is running in my script

Based on location field value selected few values are adding and removing in another filed 
if location filed is empty also few values are adding and removing
But here I am facing one issue 
in desktop level I am able to see correct format but portal level I am able to see all adding and removing options also if location is empty

Note: please find the below attachment

Advance Thanks.

[sontam lavanya]

Hi Moin Kazi,

The Ui type field is "ALL", even though I am not getting it, What I think is like in instance level the "location" field is "reference" field so when it is empty it should populate some fields in (ex: A),  it is working fine here whereas in portal level "location" field is dropdown ,so when it is empty it should work like instance but it is showing more option here.  

Note : could you please find the below attachment.