How to customize Sales Order form with SuiteScript 2.0? - netsuite

Question

I didn't find any documentation on advanced customization.
I need to customize Sales Order in a more advanced way than basic customization offered in UI Customization Menu.
For example, add some sublists under Item section with a relation one to many between Item and Messages (1), or add a new button to display a new page to create a messages record page linked with the selected item (2).
Thank you!
Explicative Screenshot

Answer 1

NetSuite's current API does not accommodate the use of custom buttons inside sublists (unless you are using the native REFRESH or MARKALL button within a custom Suitelet).
An alternative solution to bridge the gap between the item record and the message record you want to create, why not do the following:
First, create a SUITELET which opens as a CHILD window of the current window on FIELDCHANGE of the item.
Second, add a basic TEXTAREA field and include the SUBMIT button to the suitelet.
On SUBMIT of the Suitelet, ccreate a new message record, attaching it to the current sales order.
Lastly - ensure the Suitelet closes itself.
Note: This solution will only work on EDIT of a sales order. It will not work on CREATE because no order ID would exist at the time you submit a message. (You need the order ID to attach the message to).
I hope this suggestion is clear.

Answer 2

You can do your customization on BeforeLoad in a UserEvent script : you can access the current form from the context and do somethings like adding buttons, sublists, hiding fields...
You can not add a button, but you can add a link pointing to a Suitelet where you can execute your actions. As an example, I created a sublist with a View link that points out to the line's custom record:
To define the field:
var idField = appStepsSublist.addField({
id: 'id',
type: serverWidget.FieldType.URL,
label: 'View'
});
idField.linkText = 'View';
To set Value :
var viewUrl = url.resolveRecord({
recordType: 'customrecord_nab_approval_step',
recordId: appStep.id,
isEditMode: false
});
usedSublist.setSublistValue({
id: 'id',
line: index,
value: viewUrl
});
In your case, you can use the URL module to get a Suitelet link and append to it the needed data from your current line.