React event target null. Or you can cast the type of event.

React event target null target should be accessible. TS is telling you that your ‘files’ array may have null values. setState({ user: { basic: { [event. I would say that given the way this works the onChange callback with an event arg is a little misleading, since it receives a stale event argument. If the user state was having All other input fields work fine. value from React component. onClick={ (e) event. target is null within this. This is expected behaviour, the documentation for Event. 🔴 SheCodes Express is now LIVE: it’s a free, 60-minute coding session for beginners. key); setClicked(event. getQuestion} value={this. preventDefault() should be triggered manually, as appropriate. js onClick event returning all null values. currentTarget const relatedTarget = event. values from a list item? I basically want to get the current items props so I can populate a modal dialog with the data. persist(), ev. 68. activeElement throws an error, because Event could be any event, event. currentTarget; Update: In relation to your update and the error, can you try doing this: instead of using <input onChange={this. 0. target as the span itself like this event. ReactJS event. target inside the event, but when I click on SVG icon, it consoles null. I am trying to use e. state value and the same state's value used by input to show the current input value={this. target gives you the native DOMNode, Note: As of v0. Is there any reason for this? Here is my jsfiddle. The SyntheticEvent is pooled. target : TS2532: Object is possibly 'undefined'. preventDefault(); onChange(name, event. The ListItem has a number of descendant elements which will intercept the click and be the event. Lodash debounce not For the InputText's onChange event handler to accept an arrow function of the given form, you must also use e. And when I click on the text like button1, button2 it gives me the desired result. When I click the button, the event bubbles up and triggers the parent div's event listener, which I would like to stop from happening. Instead use the refs API that react provides and grab a reference to the node. The selected targets value is then used to fill in an 'input' to show the users selected value. If you are using controlled form fields, you may have to explicitly reset each component inside your form, depending on how your values are stored in the state. onChange. parentNode; } Examples: 1. Photo by Silvan Arnet on Unsplash. This is from React docs: If you want to access the event properties in an asynchronous way, you should call event. stopPropagation() or e. but event. If you're seeing this, you're accessing the property pageY on a released/nullified synthetic event. js] 1. Difference between event. react: e. target(event)# #value setValue(_ => v); My hypothesis is that by the time the closure inside setValue gets run, the event has been recycled. It isn't. ReactJS, event. Welcome to StackOverflow! The ! will indicate to the Typescript compiler that you are sure that files can never be null or undefined which should be correct in all modern browser as long as the input type is "file". Improve this answer. React events vs Browser events. const [files, setFiles] = useState(null); const Like when user clicks on Button1, I want to know that button1 is clicked and so on. 13. target is a div which does not have value. value returns undefined. stringify(obj))) event. input's event. Hope this explanation will help you. I am personally have the issues with the change fire event however one thing I see that you have wrong is invalid formatting. currentTarget will be updated to the current element that it is handling it. Event. value}; }); } <input onChange={this. 3. target) element. Also you can get the id directly rather than from the event: const toggleItem = (arrayOfObjects, objectId) => { //some implementation of toggle object's vislble prop based on id property in array } class Popupright extends React. currentTarget might be <li> element, but it's null. files[0]) still gives undefined – akano1 Commented Jun 17, 2019 at 10:36 event. target won't always work since it refers to the target that triggers the event in the first place. So, the solution I could come up with was, extending the event related types to add your target type, as: interface MyEventTarget extends EventTarget { value: string } interface MyFormEvent<T> extends React. currentTarget is attached to the listener, which I believe is the value you’re trying to log right? I guess event. Object is possibly null in TypeScript React. value, but result in null instead. I have table that contains multiple rows and has a dropdown for the last column on each row which contains 3 values Incomplete, Fail, and Pass. 5. Could someone please I was able to implement an event handler in my simple React app and I wanted to understand event. @yenshih are you relying on bubbling/capturing at all? Can you use event. This is my file input uploader: So basically what my question originates from is me trying to upload an image using a class based react component but I'm having trouble because image is event. relatedTarget this. React uses Synthetic events that are nullified and returned back to the event pool and react state updates are asynchronous so they aren't immediately processed. Ask Question The following are the functions that I have created to capture the event. 4. current. preventDefault no longer exists on the new converted event. value I guess the synthetic event gets lost somewhere because it is not there anymore when the function gets So, You can't directly access attributes of an element without specifying its data type. Before you call Uncaught TypeError: Cannot read property 'value' of null (React/JS/TS) Hot Network Questions Get requests were simple enough and I can make the POST request call but the values that are stored in the database are NULL. By default react has a pool of events and it keeps using them. key); I have the following component, where I create ref on nav to close the menu on click outside of nav: import { useState, useEffect, useRef, } from 'react'; const Header = => { const [menuOp I wanted to add lodash debounce and after that I can't write value in the input. value in React? Expected Behavior The event object passed from a TextInput component's onChange should have a key named target where the value is the text itself. persist(); const value = e. name in react to set the state as I have done before, however e. You would need to save e. Consequently the call to contains at nodeRef. This is set to The event object passed from a TextInput component's onChange should have a key named target where the value is the text itself. React is mirroring the difference between currentTarget (element the event is attached to) and target (the element the event is currently happening on). How can I fix The issue comes from the onChange prop in the Input component. value}) } In the above example console. Or you can cast the type of event. target not Element in Typescript? Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company e. target property in React can be used to handle events and perform actions on the element that triggered the event. currentTarget to get the specific targeted element. currentTarget. Passing a parameter to this save? Would that work. It should not be null with the correct way shown in my answer. The value of event. Reset file upload after useState React binds events at the document level for better performance (and uses event delegation). value in React? Does event belong to the Event Web API that I found here? I'm not sure how to use event target closest([name=""]) as I understand closest() should get the element after I change the value in the input field to calculate, but the elements I ge There I got the event object but event. I assume you mean that you get errors if you try to acces event. You might want to add a little explanation when answering a question in the future In React, e. Basically, on mouse down, touch start events, a timer is created with setTimeout. I think that using . if you need pass argument to update method you can do it like this. jQuery closest() is used to see if the target from a click event has the dom element as one of its parents. Event target is null inside functional setState. persist(). When I click on for example the "Delete" span, the event does fire, but I am getting "undefined" from event. It is not the rule that you have to pass Event for all event handlers. React. prevent. document. If you're seeing this, you're accessing the property target on a released/nullified synthetic event. About; Products event. currentTarget actually mentions this:. setState({ firstname: event. Actual Behavior The target key consistently After using ev. value = null. target, which identifies the element on which the event occurred and which may be its descendant. Viewed 20k times React was binding callbacks to this for you before. value more deeply. . This event fires on why am I getting 'event. onClick. files. Follow answered Sep 17, 2021 at 21:05. For example, if I click a div then event. 7. Commented Feb 6, 2020 at 15:33. By that point the target has been removed from the event, react cleaning it up for hygiene reasons. I realize this is a few years old now, but thought this worth a mention. From your code's point of view, it makes sense for currentTarget to be the div. value will appear null if it's not saved in another variable. ChangeEventHandler<HTMLSelectElement> Seems reasonable, but the event argument is already patched in some cases with {target: {value}}. Simply put, the difference between them is: Event. setState [React. innerText. You could declare the target as HTMLDivElement. Can we convert that into an integer ? I'm pretty new to to TypeScript so I'm looking for a graceful way to solve the following issue. value should be the value you're looking for. Commented Mar 27, 2019 at 12:31. React events are the actions due to user interaction or system events. why does it work with null object and does the event just get passed regardless? I have an object, called value from Firebase Realtime db in my component. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog I have made FlatList with country dial code numbers from json file. load(uri: string, onLoad: Function, onError: Function): number It doesn't match the react native image interface for the onLoad event: https: SyntheticEvent is an object that wraps the native Event in React, it gives you the same functionalities and more, like making sure you have the same behavior across browsers. You might want to add a little explanation when answering a question in the future When I click the button, e. value is sometimes null or undefined, and sometimes the index value. function imageClicked(event) { console. Now, I want to check if the event's target is inside another DOM node that I have stored in a React Ref: I'm not sure it's an object or not, I set the value with useState(null), but just using setPicture(e. target is null inside the callback because React recycles events objects for performance reasons: React passes the same Event object for multiple event handler calls, I have tried various options event. log() the event object, storing it in a variable, and then look for the currentTarget key in the console, its value will be null. If there is a match the click event belongs to one of the children and is thus not considered to be outside of the component. preventDefault(); const value = event. I followed this Perform debounce in React. It depends on exactly where the user clicks. const { debounce } from 'lodash' class App extends Component { constructor(){ super() Well if the elements are nested event. To Hello I have a problem with returning an id value (defined in the key attribute) of the image when using event. setState({value: event. const { target } = event. target is null */ setState(function() { return {text: event. It will never change. body. Actual Behavior The target key consistently has a value of null. currentTarget but when I print the event then currentTarget is null? 0. You can define your own event handler props with application-specific names. Follow edited Oct 11, 2014 at 19:18. How can it be that I can access and use event. FormEvent. export type InputChangeEventHandler = React. TL;DR Resetting the file input was a two-step process using both the useState() and useRef() hooks. question}/> question is just the string that I store the input in state in App. target is an HTMLElement which is the parent of all HTML elements, but isn't guaranteed to have the property value. event. This event is used to detect a change in input field in the user interface. value and event. There are two ways to handle: (1) address the null case, for example by writing code that says if files is null, do something else; (2) if you know files cannot be null you can tell TS that using the non null assertion operator ie files![0]. target), which strongly expects a Node, cannot be fulfilled by all the possible values which an event target could have. What happens inside of the component? Do you pass the id onto the input? I was trying to figure out how to do this with JSDoc (standard JS Typescript for VS Code) and within the inline property of @change on the component. let targetValue = e. value would be undefined. state. value in my callback handler: function handleConfirmation(event) { event. ReactJS onClick function does not work, TypeError: this is null. 196 8 8 bronze React checkbutton onChange event returns synthetic event. name]: event. You just need to update your onChange handler a bit: onChange={(e) => this. If you want to use inside any function then pass your event and call the function like this : function yourFunction(event){ var parentElement = i thought the currentTarget is not 'available' in html for 2 years(i used to be as3 developer). currentTarget is only available while the event is being handled. target then only we can access the value attribute from it. Expected Behavior The event object passed from a TextInput component's onChange should have a key named target where the value is the text itself. Strange second argument passed to event handler (always undefined) 7. Stack Overflow. target and Event. Load 7 more related questions Show fewer related questions Sorted by: Reset to default event. console. target references DOM element. See this link for the usage of event. Your async code executes after bubbling. value in a new variable, In general better to avoid direct DOM manipulation like remove. value before accessing it. How can I use functional update with event. Event Pooling - React uses SyntheticEvent which is a wrapper for native browser events so that they have consistent properties across different browsers. target the result was weird - null sometimes. Quite new to react so would appreciate any help here. value dont working ) Ask Question Asked 2 years, 9 React lodash debounce always return null. Weird behavior on event handlers in React. Since this is a mouse e. The problem is that this synthetic event object is recycled and reused for the next event, so it is garbage collected and set to null. This event is used to detect mouse click in the user interface. Accessing event. SyntheticEvent<HTMLDivElement, Event>) => { console. I am passing through the react-select Select component as an InputComponent within the Material-UI InputBase component. When the provided time elapses, it triggers long press. as per below functions the custom props that I specify like 'id' are accessible, but I really would like to do something like this and have all the props This is because in React uses synthetic events for performance reasons. target Handling File Upload state in React with hooks. Screenshot of Console Unc React Events. Intuitive approach to event listeners from those new to JS, is that the element with the listener to is the target. I have a state variable called emailAddress and the value of this variable is set by an input field. default() I can type but the text unfocuses after every letter and the user has to click on it again. Not all event targets are elements. Within this div there's a button with a click event listener as well. as you wrap the onLoad event of ImageLoader on settimeout. sortorder --> You could use getAttribute() with their full HTML name to read them, but the standard defines a simpler way: a DOMStringMap you can read out via a dataset property. You can declare an event handler in a parent and pass it as a prop to a child. This is because in React uses synthetic events for performance reasons. React reuses the synthetic event object so you can't use it in an async context as it is. persist() to disable this behavior. Once bubbling is complete, currentTarget is set to null. React-why event target value is undefined. log(value); }; and the console logs event. event global variable so the issue is resolved. Files are actually stored on the element itself in the DOM, so to access it you must access the target of the event and then its files attribute. value, also consider the case that the user input can be deleted or empty. The event handlers that we have in any react-app are actually passed instances of SyntheticEvent unless we use nativeEvent attribute to get the underlying browser event. But now it is gone, and you have to bind it yourself The same event object is used throughout the capturing and bubbling phases and currentTarget is updated on each step. Divyesh Puri Divyesh Puri. However, inside an event handler, you can use this, which is set to the DOM handleChange is Calling whenever you are entering any text to input Name And ` handleChange(event) { this. So far my state and setState look like this. Therefore, the if-statement is necessary to zero the variable for further proceedings. 1 React-why event target value is undefined. ChangeEventHandler<HTMLTextAreaElement> export type SelectChangeEventHandler = React. name is undefined. Component { state = { popups: [ {id: 'xxx', text: 'xxxtext', visible: React: this is null in event handler. addClass('your class'); } OBS: I agree partially with the answers above, react was made to work with states but there are some cases that we don't want to care about controlling every single aspect of our code with states, specially when there are a repetitive class, so I found easier to target these elements event. value } } }); }; The above handler DID update the state, BUT it also remove the state schema declared in the component. I have an input field and When we enter the value in the input field I am updating the state with the entered value using event. Another way to grab hold of the element and its attributes is to use React refs. Take An example Suppose that you enter "Farro" as input, You can define an event handler function separately or inline. setState Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company When an event bubbles then event. ReactJS - MouseClick gets triggered without a click. value }) and this worked fine for the standard Form (non-React Boostrap form) and it does return the correct value for the input that is being actively updated/being typed inside by a user, but event. This means that the SyntheticEvent object will be reused and all properties will be nullified after the event With e. Therefore First argument in update method is SyntheticEvent object that contains common properties and methods to any event, it is not reference to React component where there is property props. Plus, it took forever to return the correct value. If you must keep the original synthetic event around, use event. useState(""); const handleChange = e => { e. name seems to be undefined for some reason and I can't figure out why, if any one has a suggestion it will be welcome. boom boom React pools event objects I have a div with a className of styles. log(JSON. That issue being that each time render is called, it is considered a different object being assigned and therefore causes a re-render of the component. NOTE: I also included how I reset a text input in case anyone else was curious. files and you should be able to find your file. react-click event has empty event. You can add event listener of mousedown and check if the ref contains the target, if not then it means you are outside the ref (the menu in your case). We are no longer accessing the deprecated window. When I do that and take away event. Why can't I assign a value to a variable in a DatePicker field? import React, { Skip to main content. value || '' in String() is not necessary as it will always be either value (which is always a string or undefined) or the empty string in the case that value is undefined. target will point to the SVG, which is not guaranteed to be a button (obviously). name is coming out to be null in my handleOnChange function. protected onBlurHandler(event?: React. Finding mouse target in react. currentTarget instead. contains(e. The event. props Object { dispatchConfig: null, dispatchMarker: null, nativeEvent: null, type: null, target: null, currentTarget: null, eventPhase: null, bubbles: null, cancelable: null, timeStamp: null, 22 more } Any ideas? javascript; reactjs; Share. This is more general when trying to get the DOM I want to get value = 100 from event. values. That means, the inputs are controlled by state, or their source of truth is state. You can get the native Event by accessing the nativeEvent attribute of SyntheticEvent: e. currentTarget would refers to the element to which the event handler has been Learn how the event. OnChange Void issue using Typescript. This is not the "React Way" of doing things and it's considered a bad practice. Use event. React event. Maybe it makes more sense to just invoke with your own argument, ie onChange(newValue) or onChange(newValue, lastEvent). onSubmit. value – Neal Mc Beal. Event target comes back as null when I try to read it after uploading a file. value is showing undefined. Setting the element's value property to null resets the file input. See https://fb me/react-event-pooling for more information. stateChange. With an onClick button, I want to push the values of the object plus an extra ID (tuid) back to the database. id but it’s undefined. target,the e. value} by you. currentTarget shows a object,that confused me. Mouse coordinates relative to currentTarget in React in event handler. Why "SOMETIMES"? The expected behavior should be the same everytime. relatedTarget = relatedTarget // Next handlers in flow will not have null values this. target, handleBasicFromInputValue = event => { this. React how to get item props from event. The target you tried to add in InputProps is not the same target you wanted which is in React. currentTarget is changing How to access event. The MDN docs on files has more information, so just access event. nativeEvent; the target is null. For example: const onChange = e => { console. currentTarget are properties on the DOM Event Interface. This is set to null. ), which has no value. I am not getting anything inside event on clickHandler function to differentiate the buttons. (similar to a thread pool). onChangeHandler}> do this: <input onChange={(e)=>{this . currentTarget is the element to which the event handler has been attached, as opposed to Event. From the docs:. handleEvent}/&gt; The easiest The following worked for me using React Hooks. handleChange = event => { this. Now I would like to access value of event target but when i try to click on it, it doesn't work as I imagined. Thanks! currentTarget changes as the event bubbles up – if you had a event handler let v = ReactEvent. value}); } ` This is updating your state's this. target try event. likesTotal (using css modules) that has a click event listener on it. target is attached to the event (click, hover, etc. how do I get event. value); (two arguments, the first one is a string), while in your custom hook you define the callback like this Okay, theres a few questions I have seen on the react docs that i should maybe do <input onChange={this. 6. createClass. Event handlers are defined inside a component, so they can access props. #Reset a File input in React. Skip to main after adding lodash debounce react (onchange event. Thus. if you don't need access to state there the first argument should be null – azium. target. Does react have a clean way to get the this. Form. asked Oct 11, 2014 at 18:43. currentTarget docs; a nice post about event. It wraps the native event in a synthetic event, which is what event points to in your _onChange method. – Nishant Ghodke. If files[0] is not there it will set undefined which seems to be expected. object is possibly 'null' in typescript. But in reality the native event's currentTarget is the document. target, which has a value attribute, but event. So, we need to typecast the variable event. target to HTMLButtonElement when creating the target variable: function handleClick (event: This means we don’t need to use the type guard because the type of target does not include null, and the types of the other properties on the event object are left unchanged. I was trying a "flavor" of this solution first but each time I tried passing "this" into the first param of the bind instead of the null object and it kept saying "react's doing that for you, stop doing it yourself" or something in that vein. value; console. bind() in the assignment of the onClick property suffers the same problem as using an arrow function in this context. Try the above and let me know. I'm looking for a way to detect if a click event happened outside of a component, as described in this article. bind(this)} Event. onClick is undefined. " I I'm building a resume uploader form and I'd like to show the uploaded files name after it get's uploaded. Add a comment | 1 Answer Sorted by: Reset to default 15 . Modified 6 years, 4 months ago. js. If you console. I am quite sure the problem is that this in this. What do you add the id to: DOM element or React element? event. Ask Question Asked 9 years, 2 months ago. If you're seeing this, you're accessing the property 'target' on a released/nullified synthetic event. This is also described at Why is Event. activateKey = (event : React. 1. That is because react before version 17 was doing event pooling - all the event's fields get nullified after the callback is done, so you observe them as nulls in the asynchronous setState callback. Clearing a form with controlled fields. just right now i try to find out why it not 'available',but when i find this reference MDN Event. Instead, e. log(clickedElement. const handleOnSelect = (event: React. I have the following in a types. this. @Andrew The point of the answer is that target doesn't work fine if not trying to refer to the leaf child in the element chain. Handling File uploads in Reactjs. parse(JSON. Learn how the event. props. On mouse up, mouse leave, touchend, etc, the timer is cleared. ref , event. value }); this. It looks like this: event. activeElement. value for each of them: , }, }, divAnchorEl: null, yrValue: '2020', yrOpen: false, yrAnchorEl: null type MouseEventHandler = (event: MouseEvent) => mixed type MouseEventListener = {handleEvent: MouseEventHandler} | MouseEventHandler So it seems that I can type it like this: handleDocumentClick = (evt: MouseEvent) => { } So far, no Flow errors. You can see that dispatchEvent is called for every function in dispatchListeners, so its updated on every iteration. setState({focused: false}, => { // current and related are null here event. See also How come my event. I want to use lodash within class property but it always return me null for the value. This means that the SyntheticEvent object will be reused and all properties will be nullified after the event callback has been invoked. Just to clarify, import { MouseEvent } from 'react'; take the definition from @types/react and won't use the Browser DOM JS APIs. addEventListener("click", getParent, false); returns the parent element of the current element that you have clicked. name does not work. . From the event pooling section of the docs: The SyntheticEvent is pooled. value is retuning undefined 2 Can access event. How is this now handled in React? The documentation provides no work arounds. Assigning The e. currentTarget is the element to which the event is attached. g. But I don't think you will get any benefits from using the arrow function without arguments. setState({ lastname: event. currentTarget = currentTarget event. Hot Network Questions I think my professor didn't grade me properly. value === "" ? (targetValue=0) : (targetValue = e. target with React components. Using event. It seems so weird because event. The argument that is passed to the onSelect function is a div. React MenuItem event. target to return a specific target NOTE: Now that we are 6yrs later, you can also use: (per niko9911 suggestion below). target || inputRef. target has the form that I submit, I guess I just dont know the right way to access the data. Event Pooling. value be a string. currentTarget doesn't have the same behavior as Vanilla Javascript. What you're getting back Short answer: It's due to poor typings on their part. Share. stateChange(e)} Or: onChange={this. The advice from MDN is to JSONify the object and back. The handleChange function within InputBase has var element = event. FocusEvent) { const currentTarget = event. You pass id to PollDetail Component. Uncaught TypeError: Cannot read property 'value' of null 这是因为React里面的事件并不是真实的DOM事件，而是自己在原生DOM事件上封装的合成事件。 合成事件是由事件池来管理的，合成事件对象可能会被重用，合成事件的所有属性也会随之被清空。 React event. If the dropdown is selected to Pass then I need to show I created a drop down menu that returns a selected option through an event handler when the option is clicked. value not working in one, but works for the other MenuItem. If you want to call this function expression without an event object, then you'd call it this way: clickHandler(1)(); Also, since react uses synthetic events (a wrapper for native events), there's an event pooling thing, which means, if you want to use your event object asynchronously, then you'd have to use event. Odd Behavior With JavaScript OnClick Event. files whereas other fields I have such as name and title are event. Go ahead and cast it. target vs event. When I tried the whole thing broke. React has a rather special event object. I've created a codesandbox with a hook to handle long press and click. persist() on the event, which will remove the synthetic event from the pool and allow references to the event to be retained by user code. Please copy your event data to a variable or call event. currentTarget, which always refer to the element that the handler is bound to. 48. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company function getParent(event) { return event. As said in other answers, the React events are meant for React and are not compatible with the browser DOM JS APIs, which is used by addEventListener. When I click on the option, I target the innerText of that option via event. FormEvent<T> { target: MyEventTarget } interface currentTarget changes as the event bubbles up – if you had a event handler on the element receiving the event and others on its ancestors, they'd see different values for currentTarget. value is always an empty string when the function Code const ShopSearch = => { const [search, setSearch] = React. target returns the DOM element, so you can retrieve any property/ attribute that has a value; so, to answer your question more specifically, you will always be able to retrieve nodeName, and you can retrieve href and id, provided the element has a href and id defined; otherwise undefined will be returned. I also want the input field to get it's value in return from the state variable, as such: About the problem with event. value; e. target(test, event) { var element = $(event. Source: MDN target Was trying to debounce an input using lodash's debounce, but below code gave me value of undefined. persist(): React Event. React file input only works once. target inside callback in react. Improve this question. For some reason the e. dataset. value); }} you're calling onChange like this onChange(name, event. Join class NOW 👉 Watch Coding Workshops; FREE When you use setState with the new (in React 0. This is done using what is known as a "controlled input". thanks! Warning: This synthetic event is reused for performance reasons. target as HTMLDivElement; console. log(e. Notice that the event handler function now takes the event parameter and accesses it. value = 0 || e. To reset a file input in React, set the input's value to null in your handleChange function, e. I have a guess, but I wanted to ask others so I can confirm or modify any false understandings. React testing library specifically states that the target value for that event on a date input type has to be 00-00-000. Events propagate upwards. I read about event pooling in react, so I added e. target, not event. log(event. files' is possibly 'null' on the highlighted line when there the null check on the previous line? i know i can use non-null assertion operator, but like i did in the Interesting link. React: TypeError: Cannot read properties of null (reading 'removeEventListener') Hot Network Questions I would not use getElementById nor search elements in the DOM. value); // ot whatever you need } should do the trick. target null in React event handler. ts file for html input, select, and textarea:. Javascript mouseDown - cannot read currentTarget of undefined. This is how native events work in the DOM, this is not related to React. Yeah, sometimes you might require an Event object to stop propagating the event. As such, you cannot access the event in an asynchronous way. Double checked the event. You could just use a useState hook with null as default value and call the setState method from inside the event callback function setting it the value of the event. React allows developers to handle these events using a declarative approach, making it easier to create interactive and dynamic user interfaces. persist() but the random behavior still remains. Description. value is undefined in reactjs. value) would appear as the value but then in setState, e. value); setState({blah: e. target is undefined for only one input element. value returns as undefined. IIRC nulling it out is consistent with what happens on native events; if not, let me know and we'll reconsider our behavior here. This is assuming you're handling React's Synthetic Event. Only an event's currentTarget points to the element the handler's on. You're supposed to pass the previous state and props in. MouseEvent): void =>{ const clickedElement = event. As event is null, How should I access the properties of an element without using the 'this' keyword in React Native? I have a function with which the parent class itself is bound as 'this' but I want to access the properties of the element that is being clicked. Long answer: The reason this happens is because if you click on an <svg /> inside a button (for example), the event. If you do calculations with an input field with your e. target could be any element that extends EventTarget | null, which is no specific element, and maybe has no activeElement. This is for performance reasons. currentTarget changes as the event bubbles up – if you had a event handler on the element receiving the event and others on its ancestors, they'd see different values for currentTarget. ChangeEventHandler<HTMLInputElement> export type TextareaChangeEventHandler = React. setState({ [event. Event declaration in react is different from HTML, React uses: the camelCase convention instead of lowercase letters. boom. I would recommend to change the function declared after map to an arrow function. How can you update this. This is documented in the React documentation. target instead if not? If you need to use To cite one of the React core developers - Sophie Alpert. currentTarget is null (all other properties are kept intact). What is the main point is you are just passing functions to those events, and you can pass 0 or more parameters. 18 event. onChange={event => { event. – JavanPoirier. You should be using event. See below Typescript: Object is possibly null event after an if in React. 13) callback argument, all the Event object properties are null inside the callback. I checked event. persist() prior to setState( ): So instead of. state based on the value of the event target? handleEvent(event) { /* Fails! event. target is taking react child components separately. This is for performance reasons. I have an onChange handler for when the uploaded file is changed, but when I try to read the event's properties, specifically target as that's where I read my infor should be, it comes back as null. However the event itself occurs on an input inside the div. So how are we able to even use event. When you don't specify the event parameter Perhaps you've just started working with React, and you're working with event handlers and you've noticed that when you get the Event Object back, it doesn't look quite the same as it did in vanilla JS. e. event target value does not work after adding . Wrapping native event instances Instead of event. By default the event. target is the element that triggered the event. target is null – Hareesh. nativeEvent You can check the documentation if you wanna know more about it. Get component's prop in its event handler in React. Can we c If the event. value. target element is not an input type element, it will not have a value property. value is retuning undefined. This is a tricky one because the material-ui TextField component involves multiple nested nodes. 14, returning false from an event handler will no longer stop event propagation. Commented Mar 12, 2021 at 15:15. Screenshot of Console Unc When using the ES6 class syntax, your class' functions are not automatically bound to the proper context (like they would be when using React. value always returns undefined? While the solution proposed by @Agney will probably work in most cases, it failed me when I was using event delegation – the property I want to access was on the child element, which was event. target will be the element that was actually clicked which isn't, necessarily, the same as the element to which the event handler was bound. js (second answer and solution number 3) my code: // func Skip to main content I have an input field and When we enter the value in the input field I am updating the state with the entered value using event. This happens when it is not bound correctly to the the class. Most of the time you shouldn't worry about nativeEvent and use what React gives you. Wrapping event. 2. Warning: This synthetic event is reused for performance reasons. now with the currentTarget 'available' for me,it make my life easier,but i just want to know Make sure to check event. ipt vrb agga euxnl upy uakjyjq jwlzui yyfbjumb vysu tciayx