Fields will be Auto filled without saving the record and without refreshing the page
I have created a business process for auto-filling field values. But, the fields will be auto-populated after saving the record and refreshing the page. But, I need it to be done without saving the record and refreshing the page. Here, I am attaching the business process and desired results screenshots. Please have a look and provide your valuable assistance as soon as possible.
After choosing the Existing contact using the Applicant Name lookup, the below fields will be auto-filled with the corresponding values without saving the record and refreshing the page. In my case, Applicant Name is the lookup field which is referencing the Contacts.
I know it is possible through JS Scripts and the onChange method. But, the fields belong to the Contacts section. How can I get the values from the Contacts section? Please provide your assistance. I was unable to get the values from the Contacts section. These are two different sections. The applications section is the custom section. Whenever the user selects the existing contact, some of his/her details will be auto-populated from the Contacts section. Please provide your valuable suggestions.