I am trying to learn React hooks, and trying to convert existing codebase to use hooks, but I am confused. Is it normal to set state inside useEffect? Would I be causing the dreaded infinite loop if I do so? My original class based component: Answer It’s okey to set state inside useEffect as long as you…
Tag: reactjs
Filter array based on dynamic objects and values in JS
I have an array which contains a list of different objects and I want to be able to re-use the same function to filter different objects and values within the same array. My array and I’m calling a function to filter the array passing 2 parameters: the field I want to filter on the value it should filte…
React: How to make selected options not to show in input field of Material UI Autocomplete
I would like not to have the labels of the selected Options in the Input field: It can probably be addressed in the renderInput property but I dont know how. I know there is the limitTags prop but the options would still be displayed in the input field when it is selected. here is an example code: Any suggest…
Nested Query GraphQl
I am new using graphql and I would like to know how could I filter my query to get the recipes that has some of the ingredient objects I have in my input array. this is the schema.gql file this recipe schema has 1 respective service and the respective Query resolvers the main idea here is just to have one
React render DOM HTML page in component
In my React app, I am using the standard component. However, when the user clicks a save & exit option they should be redirected to a page which is a dom element from an outside location: document.getElementById(‘thank-you’) I’ve created a component which should display this page: Redire…
Why is this promise returning undefined?
I am trying to write a simple function like this and I have made a firebase helper like this however, league is logging out as undefined and in here is logging out second. however, I thought it would be the other way around? I thought it would “await” for this function to resolve then once it̵…
Javascrip default parameter ReferenceError: param is not defined
I have a function defined to fetch some data. I set default parameters like this: I import this function in my component and use it like so: It works without setting limit and offset, but when I try to pass new values for offset and limit, I get an Unhandled Runtime Error ReferenceError: limit/offset is not d…
Uncaught TypeError: event.target is undefined
Using React and React-Dropdown package, I keep getting this Uncaught TypeError: event.target is undefined error whenever I select a year. Answer Looks like this package doesn’t pass in the event but only the changed value of the new selected option: https://github.com/fraserxu/react-dropdown/blob/master…
expo FaceDetector keep triggering “onFacesDetected” event in “accurate” mode even without face
I’m new to react native. I’m using expo FaceDetector to detect faces. when I’m using it in “fast” mode it trigger “onFacesDetected” event correctly. But when I’m using “accurate” mode “onFacesDetected” event keep triggering (on “min…
How do I reference a styled-component that is a functional component?
This is the most basic example I could think of: In this example, I want to style Foo component that is a descendent of div. I would expect the resulting markup to look something like: However, instead it is simply: It seems like no styling is applied anywhere. Furthermore, the component Foo is rendered only …