Missing option to set a default value using a template / templates render fields as read-only about json-editor

[germanbisurgi]

Hi @simontaurus,

for default values there is the default schema property

{
  "type": "string",
  "format": "date",
  "default": "2022-02-02",
  "template": "your_callback"
}

Editors with template are read only because they are "generated" and very often overridden by the template expression / callback.

[simontaurus]

Okay, so currently default is the way to set a static value until the user overrides it. template will enforce a dynamical value without any option for the user to change it (read-only). For usecases like the receiving_data of a shipment I'm looking for a way in between to set the current date (now) as default but allow the user to change it to any other date (e. g. yesterday).

Setting a now callback as template works but this renders the field as readonly.

{
  "type": "string",
  "format": "date",
  "template": "now"
}

JSONEditor.defaults.callbacks = {
	'now': (jseditor_editor, e) => {
		return new Date(Date.now()).toISOString();
	}
}
//or
Handlebars.registerHelper('now', function (options) {
	return new Date(Date.now()).toISOString();
})

Setting now as default keeps the field editable, but now is not interpreted as template.

{
  "type": "string",
  "format": "date",
  "default": "now",
}

A solution could be to allow templates in default values (see #142 (comment)), so that "default": "now" or "default": "{{now}}" is resolved to the current datetime (e.g. "default": "2024-02-04T04:31:08.050Z") at the initialisation of the editor but the user could still set another datetime.