kingscript-plugin-dev

Extend AbstractOperationServicePlugIn, preload fields in onPreparePropertys, and place validation in beforeExecuteOperationTransaction and database sync in beginOperationTransaction. Export a singleton instance with let plugin = new MyPlugin() and export { plugin }.

BusinessDataServiceHelper returns structured, tree-shaped data that can be modified and saved back to the database. QueryServiceHelper returns flattened read-only rows with better performance, suitable for display-only queries.

JavaScript number arithmetic introduces floating-point errors such as 0.1 + 0.2 yielding 0.30000000000000004. BigDecimal provides exact decimal arithmetic with explicit rounding modes like ROUND_HALF_UP, which is mandatory for amounts, prices, and quantities.

No. Plugin instances are shared and cached across all form instances, so class properties cause data leakage between pages. All state must use method-local variables, with context accessed via this.getModel() and this.getView().

A single query returns at most 50,000 rows and 100 fields, a transaction allows at most 150 queries and 100 DML operations, and one DML call affects at most 1,000 records. Direct DB or ORM access is forbidden; ServiceHelper interfaces must be used.

The parent sets custom parameters via FormShowParameter.setCustomParams before showForm, and the child reads them in afterCreateNewData through getFormShowParameter().getCustomParams(). For returning data, use returnDataToParent with the parent's closedCallBack, or share values via PageCache.