Hooks

Refer to the TypeScript reference page for information about the types and interfaces referenced below.

These Hooks are used internally by React Query Builder.

Component logic

The core logic of each component is encapsulated in a reusable Hook. Each main component is itself little more than a call to its respective Hook and the JSX that utilizes the properties in the returned object. This enables the creation of one's own presentation layer without having to copy any code from the default components.

tip

The @react-querybuilder/native package is a good example of this concept. It calls the Hooks from its own query builder, rule group, and rule components, but nests the sub-components within React Native View elements instead of HTML div elements like the standard components.

useQueryBuilder

function useQueryBuilder(props: QueryBuilderProps): {
  actions: QueryActions;
  query: RuleGroupTypeAny;
  queryDisabled: boolean;
  rqbContext: ReturnType<typeof useMergedContext>;
  schema: Schema;
  translations: TranslationsFull;
  wrapperClassName: string;
};

Used by the QueryBuilder component. Returns everything needed to render a wrapper element (e.g. <div>) and the root RuleGroup element based on the provided props. Generates an id for each rule and group in the query hierarchy that doesn't already have one.

useRuleGroup

function useRuleGroup(props: RuleGroupProps): {
  // See source code for returned properties:
  // /packages/react-querybuilder/src/hooks/useRuleGroup.ts
};

Used by the RuleGroup component.

useRule

function useRule(props: RuleProps): {
  // See source code for returned properties:
  // /packages/react-querybuilder/src/hooks/useRule.ts
};

Used by the Rule component.

useValueEditor

function useValueEditor(
  props: Pick<
    ValueEditorProps,
    | 'handleOnChange'
    | 'inputType'
    | 'operator'
    | 'value'
    | 'listsAsArrays'
    | 'type'
    | 'values'
    | 'parseNumbers'
    | 'skipHook'
  >
): { valueAsArray: any[]; multiValueHandler: (val: string, idx: number) => void };

Used by the ValueEditor component. Accepts an object with a subset of ValueEditorProps and returns the value as an array and a multi-value handler.

This Hook updates the value as a side effect if the following conditions are true:

• skipHook is false (the value editors in the compatibility packages set this to true to avoid infinite loops)
• inputType is "number"
• operator is something other than "between", "notBetween", "in", or "notIn"
• value is an array or a string containing a comma (,).

If all of those conditions are met, handleOnChange will be called with the first element of the array or, if value is a string, any characters before the first comma.

useValueSelector

function useValueSelector(
  props: Pick<ValueSelectorProps, 'handleOnChange' | 'listsAsArrays' | 'multiple' | 'value'>
): {
  onChange: (v: string | string[]) => void;
  val?: string | any[];
};

Used by the ValueSelector component. Transforms the given value into an array when appropriate and provides a memoized change handler.

useSelectElementChangeHandler

function useSelectElementChangeHandler(props: {
  multiple?: boolean;
  onChange: (v: string | string[]) => void;
}): (e: ChangeEvent<HTMLSelectElement>) => void;

Used by the ValueSelector component. Returns a memoized change handler specifically for HTML <select /> elements.

Utilities

useMergedContext

function useMergedContext(
  props: QueryBuilderContextProps & { translations: Translations }
): QueryBuilderContextProps;

Merges the values inherited from the nearest ancestor QueryBuilderContext provider with the current component's props.

usePreferProp

function usePreferProp(default: boolean, prop?: boolean, context?: boolean): boolean;

Given a default value, a prop value, and a context value (all boolean or undefined), returns the first one that is not undefined in the order of (1) prop, (2) context, (3) default.

usePrevious

function usePrevious<T>(prop: T): T | null;

Returns the value of a prop or state variable from the previous render.

Internal

These Hooks log error messages to the console in certain situations (in development mode only). They encourage correct usage of React Query Builder and are not intended to be used in custom components.

useControlledOrUncontrolled

Logs an error to the console if any of the following are true:

• Both query and defaultQuery props are defined.
• The query prop is defined during the first render and undefined in a subsequent render.
• The query prop is undefined during the first render and defined in a subsequent render.

useDeprecatedProps

Logs an error to the console if a RuleGroup component is rendered with combinator or rules props, or if a Rule component is rendered with field, operator, or value props. These props are deprecated in favor of ruleGroup and rule, respectively.

useReactDndWarning

Logs an error to the console if the enableDragAndDrop prop is true but the react-dnd and react-dnd-html5-backend dependencies are not loaded.