There is a JavaScript error in your browser console- Catalog Client script in Service Portal

[ServiceNow10sun]

Hi All , 

Everytime i write Catalog Onchange cleint script i get Error as ' There is a JavaScript error in your browser console ' 

,Could you any one let me know the issue . 

My Requirement is  a message ( Hi Urgency 2 ) should come in service portal when in the catalog name' Incident'  field name 'urgency' choice '2- High ' is selected similarly for if choice '3-Medium'  then message ( Hi urgency 3) and for choice '4-Low' then message should come as ( Hi urgency 4) . 

Also need suggestion are we not suppose to use Onchange client script on service portal ? 

i have tried basic message to check if it works or not but got same error :

function onChange(control, oldValue, newValue, isLoading) {
if (isLoading || newValue == '') {
return;
}
if(newValue==2)
{
g_form.addInfoMessage(Hi);
}
//Type appropriate comment here, and begin script below

} 

@Saurav11 @Ankur Bawiskar 

[Muhammad Khan · Accepted solution]

Place your message in quotes.

function onChange(control, oldValue, newValue, isLoading) {
if (isLoading || newValue == '') {
return;
}
if(newValue==2)
{
g_form.addInfoMessage('Hi');
}
//Type appropriate comment here, and begin script below

} 

[Ankur Bawiskar]

@ServiceNow10sun 

Points mentioned by members should help you resolve your query