10 examples of 'prevstate in react' in JavaScript

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31static getDerivedStateFromProps(nextProps: Props, prevState: State): State {
32 let newState = prevState;
33
34 if (nextProps.value.type !== prevState._backgroundType) {
35 newState = {
36 ...prevState,
37 backgroundType: nextProps.value.type,
38 _backgroundType: nextProps.value.type
39 };
40 }
41
42 return newState === prevState ? prevState : null;
43}
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9prev(state: State): State {
10 return state
11}
280value: function componentDidUpdate(_, prevState) {
281 var _props2 = this.props,
282 isOpened = _props2.isOpened,
283 onRest = _props2.onRest,
284 onMeasure = _props2.onMeasure;
285
286
287 if (this.state.currentState === IDLING) {
288 onRest();
289 return;
290 }
291
292 if (prevState.to !== this.state.to) {
293 onMeasure({ height: this.state.to, width: this.content.clientWidth });
294 }
295
296 var from = this.wrapper.clientHeight;
297 var to = isOpened ? this.getTo() : 0;
298
299 if (from !== to) {
300 this.setState({ currentState: RESIZING, from: from, to: to });
301 return;
302 }
303
304 if (this.state.currentState === RESTING || this.state.currentState === WAITING) {
305 this.setState({ currentState: IDLING, from: from, to: to });
306 }
307}
68value: function getDerivedStateFromProps(nextProps, prevState) {
69 if ('value' in nextProps && !isEqual(nextProps.value, prevState.prevPropValue)) {
70 var state = DatePanel.propsToState(nextProps);
71 state.prevPropValue = nextProps.value;
72 return state;
73 }
74
75 return null;
76}
33static getDerivedStateFromProps(
34 props: WithInputHandlersProps,
35 state: State
36) {
37 let newState = state;
38 if (props.value !== state._value) {
39 newState = {
40 ...newState,
41 _value: props.value,
42 value: props.value
43 };
44 }
45
46 return newState === state ? null : newState;
47}
34stateFromProps(props) {
35 const { getData, readOnly } = props.blockProps;
36 const initialState = pubsub.get('initialState_' + props.block.getKey());
37 if (initialState) {
38 //reset the initial state
39 pubsub.set('initialState_' + props.block.getKey(), undefined);
40 }
41 return {
42 componentData: getData() || { config: DEFAULTS },
43 readOnly: !!readOnly,
44 componentState: initialState || {},
45 };
46}
56stateFromProps(props) {
57 const { readOnly } = props.blockProps;
58 const initialState = pubsub.get('initialState_' + props.block.getKey());
59 if (initialState) {
60 //reset the initial state
61 pubsub.set('initialState_' + props.block.getKey(), undefined);
62 }
63 return {
64 componentData: this.getData(props),
65 readOnly: !!readOnly,
66 componentState: initialState || {},
67 };
68}
19componentDidUpdate(prevProps: Props) {
20 // Support page recovery
21 if (this.props.children !== prevProps.children) {
22 this.setState({exception: null});
23 }
24}
35value: function getDerivedStateFromProps(nextProps, prevState) {
36 if ('value' in nextProps && !isEqual(nextProps.vlaue, prevState.prevPropValue)) {
37 return {
38 prevPropValue: nextProps.vlaue
39 };
40 }
41
42 return null;
43}
46static getDerivedStateFromProps(nextProps, prevState) {
47 return {
48 explorer: nextProps.explorers[nextProps[idPropertyName]],
49 };
50}

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