Custom Member Form and Contact List Synchronization

Whatever you include in your register form is what gets collected.

See the register api and 'Register a user as a site member with registration options' for more info.

https://www.wix.com/corvid/reference/wix-users.html#register

These are the fields that you can use to collect registration info in the Wix PrivateMembersData collection when users first register.

https://support.wix.com/en/article/corvid-wix-members-privatemembersdata-collection-fields

If you want more info, then you can create your own members dataset and each member can have their own profile page which can be updated with whatever user inputs you want.

https://support.wix.com/en/article/corvid-tutorial-building-your-own-members-area

This is my own sign up lightbox code which works perfectly and closes after registering details before moving user onto signup status page, then both names will be saved in contacts and once site member is approved the member details will be added to 'members' database (which I have added as a separate dataset similar to the example in the building your own members area tutorial above).

import wixUsers from 'wix-users';
import wixWindow from 'wix-window';
import wixLocation from 'wix-location';

$w.onReady(function () {
    
    $w("#registerButton").onClick( (event) => {
        
   let email = $w("#email").value;
   let password = $w("#password").value;
   let first = $w("#firstName").value;
   let last = $w("#lastName").value;

   wixUsers.register(email, password, {
       contactInfo: {
        "firstName": $w('#firstName').value,
        "lastName": $w('#lastName').value,
       }
      } )
      .then( (result) => {
        let resultStatus = result.status;
  wixWindow.lightbox.close();
  wixLocation.to("/sign-in-status");  //Change the URL ending to whatever page you want to send the user to after they log in.
      } );     
    } );
    
});

You can add custom fields to your contacts.

https://support.wix.com/en/article/adding-custom-fields-to-contacts

Plus you can create a new contact without registering the user by viewing the create contact example below, which would need the Wix crm import at the top of your code..

https://www.wix.com/corvid/reference/wix-crm.html#createContact

The create contact is something I have done on my own website after a user has submitted a user input form with an on after save hook, which runs first and gets the values before entering them into my contacts and then sending my triggered email afterwards.

import wixCRM from 'wix-crm';

$w.onReady(function () {
$w("#JoinUsForm").onAfterSave(() => {
let startDate = $w("#startDate").value;
let firstName = $w('#firstName').value;
let lastName = $w('#lastName').value;
let email = $w("#email").value;
let choirRole = $w("#choirRole").value;
let readMusic = $w("#readMusic").value;
let choirBefore = $w("#choirBefore").value;
let startNow = $w("#startNow").value;

wixCRM.createContact({ 
"firstName": firstName,
"lastName": lastName,
"emails": [email],
"Choir Role": choirRole,
"Read Music": readMusic,
"Choir Before": choirBefore,
"Start Now": startNow,
"Start Date": startDate
}) 
.then((contactId) => { 
// Need to use the triggered email name
return wixCRM.emailContact('joiningusform', contactId, { 
"variables": { 
// Need to use the triggered email variable names
"firstName": firstName,
//"lastName": $w('#lastName').value, << - not defined in the triggered email
"email": email,
"choirRole": choirRole,
"readMusic": readMusic,
"choirBefore": choirBefore,
"startNow": startNow,
"startDate": startDate.toLocaleDateString('en-GB', { weekday: 'short', day: 'numeric', month: 'short', year: 'numeric'})
} 
}); 
}) 
.catch((err) => { 
// handle the error if the email wasn't sent
console.log(`Error: ${err}`);
}); 
}); 
}); 

As @givemeawhisky wrote, you need to first define your members custom fields: https://support.wix.com/en/article/adding-custom-fields-to-contacts. Then the additional fields you send as ContactInfo on register() will be populated to these fields.

@givemeawhisky @Ohad Laufer,

Custom fields were already added to Contacts. The problem is that when you fill in that information, it is not being captured after you register.