score:273
The SyntheticEvent interface is generic:
interface SyntheticEvent<T> {
...
currentTarget: EventTarget & T;
...
}
(Technically the currentTarget
property is on the parent BaseSyntheticEvent type.)
And the currentTarget
is an intersection of the generic constraint and EventTarget
.
Also, since your events are caused by an input element you should use the ChangeEvent
(in definition file, the react docs).
Should be:
update = (e: React.ChangeEvent<HTMLInputElement>): void => {
this.props.login[e.currentTarget.name] = e.currentTarget.value
}
(Note: This answer originally suggested using React.FormEvent
. The discussion in the comments is related to this suggestion, but React.ChangeEvent
should be used as shown above.)
score:0
The following have the same type:
let event1: { target: { value: any } };
let event2: { target: HTMLInputElement } };
score:2
For those who are looking for a solution to get an event and store something, in my case a HTML 5 element, on a useState
here's my solution:
const [anchorElement, setAnchorElement] = useState<HTMLButtonElement | null>(null);
const handleMenu = (event: React.MouseEvent<HTMLButtonElement, MouseEvent>) : void => {
setAnchorElement(event.currentTarget);
};
score:7
I have the following in a types.ts
file for html input, select, and textarea:
export type InputChangeEventHandler = React.ChangeEventHandler<HTMLInputElement>
export type TextareaChangeEventHandler = React.ChangeEventHandler<HTMLTextAreaElement>
export type SelectChangeEventHandler = React.ChangeEventHandler<HTMLSelectElement>
Then import them:
import { InputChangeEventHandler } from '../types'
Then use them:
const updateName: InputChangeEventHandler = (event) => {
// Do something with `event.currentTarget.value`
}
const updateBio: TextareaChangeEventHandler = (event) => {
// Do something with `event.currentTarget.value`
}
const updateSize: SelectChangeEventHandler = (event) => {
// Do something with `event.currentTarget.value`
}
Then apply the functions on your markup (replacing ...
with other necessary props):
<input onChange={updateName} ... />
<textarea onChange={updateName} ... />
<select onChange={updateSize} ... >
// ...
</select>
score:11
you can do like this in react
handleEvent = (e: React.SyntheticEvent<EventTarget>) => {
const simpleInput = (e.target as HTMLInputElement).value;
//for simple html input values
const formInput = (e.target as HTMLFormElement).files[0];
//for html form elements
}
score:30
for update: event: React.ChangeEvent
for submit: event: React.FormEvent
for click: event: React.MouseEvent
score:32
I think the simplest way is that:
type InputEvent = React.ChangeEvent<HTMLInputElement>;
type ButtonEvent = React.MouseEvent<HTMLButtonElement>;
update = (e: InputEvent): void => this.props.login[e.target.name] = e.target.value;
submit = (e: ButtonEvent): void => {
this.props.login.logIn();
e.preventDefault();
}
score:41
To combine both Nitzan's and Edwin's answers, I found that something like this works for me:
update = (e: React.FormEvent<EventTarget>): void => {
let target = e.target as HTMLInputElement;
this.props.login[target.name] = target.value;
}
score:52
The problem is not with the Event type, but that the EventTarget interface in typescript only has 3 methods:
interface EventTarget {
addEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void;
dispatchEvent(evt: Event): boolean;
removeEventListener(type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): void;
}
interface SyntheticEvent {
bubbles: boolean;
cancelable: boolean;
currentTarget: EventTarget;
defaultPrevented: boolean;
eventPhase: number;
isTrusted: boolean;
nativeEvent: Event;
preventDefault(): void;
stopPropagation(): void;
target: EventTarget;
timeStamp: Date;
type: string;
}
So it is correct that name
and value
don't exist on EventTarget. What you need to do is to cast the target to the specific element type with the properties you need. In this case it will be HTMLInputElement
.
update = (e: React.SyntheticEvent): void => {
let target = e.target as HTMLInputElement;
this.props.login[target.name] = target.value;
}
Also for events instead of React.SyntheticEvent, you can also type them as following: Event
, MouseEvent
, KeyboardEvent
...etc, depends on the use case of the handler.
The best way to see all these type definitions is to checkout the .d.ts files from both typescript & react.
Also check out the following link for more explanations: Why is Event.target not Element in Typescript?
Source: stackoverflow.com
Related Query
- React Hooks TypeScript event and state types
- Typescript React event handler types
- Typescript: React event types
- Set types on useState React Hook with TypeScript
- Typescript types for React checkbox events and handlers?
- React event type in Typescript
- React prop types with TypeScript - how to have a function type?
- How to organize types definitions in a React Project w/ Typescript
- React event handlers with Typescript and JSX
- Specify type for file upload event in react typescript
- import Event Types from React (TypeScript)
- React TypeScript get Data Attribute From Click Event
- How to attach drag event handlers to a React component using TypeScript
- React Prop Types vs Typescript
- React Typescript - How add Types to location.state when passed in a Route
- React Typescript element types
- React Typescript element types
- Sending event handlers as props into a React component using TypeScript
- React Typescript event type for both interfaces MouseEvent and TouchEvent
- React TypeScript Input Paste Event
- TypeScript types for React component where prop is an array of objects?
- optional react useState types with jsdoc, typescript checkjs (javascript)
- Creating a Custom Button in React Typescript and add onClick Event
- Typescript React stateless function with generic parameter/return types
- How to use Graphql typescript types in react
- onKeyDown Event in React with TypeScript
- Fixing typescript warnings when inferring react props types from map of string=>type
- React TypeScript | Correct Type for Event Handler Prop
- Dynamic object key with Typescript in React event handler
- How to test with jest and typescript with types a basic react function component
More Query from same tag
- Mount/Render a React component manually using JS
- TypeScript: is there a way to parameterize an enum
- dilemma of using "createHashHistory" vs "createBrowserHistory" incontext of deployment
- async await syntax not catching any error on a jwt verification
- Is there any place for OOP in redux?
- ReactJS children - filter out null values
- Setting state in the Query component of react-apollo
- How to handle input change for semantic-ui-react Dropdown object in a form without creating multiple handlers?
- http request with wrong domain
- Getting undefined JSON path, but data is available in console.log
- Why does React useRoutes giving me invalid hook error?
- Express - return certain documents with named route parameters using axios
- Cannot call a function inside a then method
- create dynamic number of components in react js
- what is the difference between React setState and Hooks setState?
- React Router: Transition without window.location
- Using persist cookies with react on mobile devices
- npx-create-react-app my-app command ERROR in Vs Code
- Computer move to always random empty cell in tic tac toe game React.js?
- How to handle state on array of checkboxes?
- How do I test async fetch in react componentDidMount with chained promises?
- Use a local tile layer with leaflet
- how to pass just the function from one component to other component without passing the whole component or button click
- Input doesn't change color according to the validation (rcc)
- Customize ChartJS Hover Data Format
- Accessing an array that has an object as a value
- What does api.cache(true) do in Expo's babel.config.js?
- Could not find an open port at x86_64-conda_cos6-linux-gnu
- Inline background-image in React
- React redux toolkit 'Cannot set properties of undefined (setting 'check')