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React

Is the Lean Startup method dead in 2020?

The Lean Startup method, developed and popularized by Eric Ries, has proved to be an outstanding tool for launching small and medium-sized businesses. However, it is not possible to calculate at least the approximate number of successful businesses launched using the Lean Startup methodology. Although there are several well-known examples of how companies used this […]

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Development React

React Animated – Can’t interpolate descending value

I’m trying to interpolate an animation value(movement) to bind it to another animation(width change) occurring at the same time. Why does the input range not support descending values? Am I thinking of this incorrectly? The animation would be moving in an upward direction (to an offscreen point) so the y Value would have to descend. […]

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Development React

React Native nested Flatlist (horizontal flatlist inside vertical flatlist)

I have a horizontal flatlist inside a vertical flatlist and I want data on the inside flatlist to be provided based on which item of the outer flatlist is being rendered This is what I have currently: <FlatList style={styles.outerFlatlist} data={this.state.catagories} renderItem={({item, index})=>{ return ( <View> <View> <Text style={styles.catagoryName}> {item.CategoryName} </Text> </View> <View style={styles.innerFlatlist}> <FlatList horizontal={true} […]

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Development React

How to render a React component styled with Emotion in an iframe in Gatsby site?

I work on a component library and a demo site. Components are styled using Emotion and the demo site is built with Gatsby. For preview purposes, I’d like to render components in an iframe. This will ensure that styles from the website are not cascading to the components, make it easier to deal with responsive […]

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Development Firebase React

Clear a react state field before refreshing with new data from firebase

The screenshot is from State.Firestore.ordered.trainings in the console. Let’s say exampleA.js has the following codes of firestoreConnect([ { collection: “trainings”, ]) while exampleB.js has the following codes of firestoreConnect([ { collection: “trainings”, orderBy: [“dateTime”, “asc”], where:[[“trainingName”,”==”,”abc123″]] } ]) When I first loaded exampleA.js, the trainings data are loaded randomly from the database(Firestore), as shown and […]

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Development React

React memory leaks warning with using a statefull button in a dialog or alert in Material UI

I am using Material UI for a component library and noticed when I click a button within a Dialog or Alert (both components manage states of open/closed), I get a memory leaks warning. I am unsure of how to fix the problem here. The button component uses state to create an active class when clicked, […]

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Development React

How do I create typescript type definitions for react-native native ui component?

Let us say that I have a react native native UI component like the one in this example. How do I create a typescript type definition for it, like the ones that can be imported, for example with ‘npm i @types/somelib’? I didn’t find explanations about how to do this in the documentation. The idea […]

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API Development HTTP MVC React

Getting “reactor.netty.http.client.PrematureCloseException: Connection prematurely closed BEFORE response” while mocking a third part API

My Spring boot API is consuming a third part API using WebClient DemoAPIController @RestController public class DemoAPIController { @Autowired DemoService demoService; @GetMapping(“/mytest”) public Mono<UserType> getUserType() { return demoService.getUserType(); } } DemoService.java @Component public class DemoService { @Value(“${base.url}”) private String baseUrl; public Mono<UserType> getUserType() { System.out.println(“baseUrl:” + baseUrl); WebClient webClient = WebClient.builder().baseUrl(baseUrl) .defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE) .defaultHeader(“apikey”, “test”).build(); […]

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Development React

React Hook updates parent state a step behind

When a functional component updates a prop, the parent’s state does not get the new value until another change is made to the picker element. It goes as such: Picker loads with date A. => I pick date B. => Picker renders date B but parent state shows selectedDate of date A. => I pick […]

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Development React

react Portal – how to close modal when clicking outside of modal and how to assign ref to modal inside parent component rendering modal?

I am using react portal and want to make it possible that modal closes when user clicks outside of modal. I am creating a ref inside my parent,but cannot really assign it to the modal itself as react portals arent actual DOM nodes (as I understood). I can also not wrap around this.props.children inside a […]