React event target is null. 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. 13) callback argument, all the Event object properties are null inside the callback. See my answer as to why. Here's an example with jQuery, attaching the listener to document: $(document). By the time setState is executed (especially since you're using functional setState), the React SyntheticEvent will have been cleared, so it's target property will be null. Aug 31, 2023 · Is there any way to handle the null probability without changing other parts of the code? I don't think so. This is mostly only a problem because the console lazily evaluates the object you log. value}); } handlePasswordChange(event) {. Just to clarify, import { MouseEvent } from 'react'; take the definition from @types/react and won't use the Browser DOM JS APIs. current is null. In this case, because the button contains a span, sometimes the user was clicking on the button itself, and sometimes on the span within. Mar 4, 2019 · I've created a list of images in React. value in my callback handler: Dec 19, 2016 · 2. target, event. Feb 7, 2019 · Warning: This synthetic event is reused for performance reasons. persist(). Nov 18, 2016 · 4. Why "SOMETIMES"? The expected behavior should be the same everytime. 2,562 8 30 41. I am trying to change the ID of each Polyline by clicking and then inserting a number in the input field. By default the event. onChange(), not the event, and you shouldn't set it to null. currentTarget is the element to which the event is attached. useRef<any>(null); When the button is clicked, the event object that is passed to the handler function will have the event. 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. currentTarget instead. id but not the event. And then use this variable. Your help is much appreciated! May 25, 2021 · Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand Jan 22, 2024 · The React onClick event handler enables you to call a function and trigger an action when a user clicks an element, such as a button, in your app. Apr 6, 2018 · You'd need to cast (type assertion) event. target to access the properties of a specific element (here I use . (similar to a thread pool). g. Jun 24, 2019 · <select value="1" onChange={(event) => { /* Add ! after target to state that "event. Also since you are executing many things within the onClick handler, I recommend you take it out into new function. log output in changeModeHandler shows the button tag as empty. currentTarget is an element that a handler for the event is attached to (and not necessarily the one which triggered the event) in the DOM tree where the event can reach by bubbling. You can see that dispatchEvent is called for every function in dispatchListeners, so its updated on every iteration. if you replace div with form and replace target with currentTarget then it will work. Handling events with React elements is very similar to handling events on DOM elements. target is the element that triggered the event and there is only one target in a triggering of an event. name returns nothing if you run console. You would need to make use of callback approach. I have no idea what else to do. Even the KeyboardEvent you're trying to use can occur on a DOM element or on the Mar 5, 2020 · the switch statement is after i have logged the event and discovered that e. Example: function onClick(event) {. Mar 15, 2017 · 0. 0. value is sometimes null or undefined, and sometimes the index value. calendarBodyRef. querySelector('input')); It also doesn't get an element's children like the question asked. You'll have to adjust your function and resolve errors, like so: Feb 24, 2022 · 2. currentTarget will be updated to the current element that it is handling it. target of the React. gfranko opened this issue on Jan 14, 2015 · 12 comments. I simplified the code here and put it below. value is empty? 3. @yenshih are you relying on bubbling/capturing at all? Can you use event. I have tried different binding methods but haven't been able to make it work. parentNode. The SyntheticEvent now holds 'currentTarget', such as in event. The read-only target property of the Event interface is a reference to the object onto which the event was dispatched. onOutsideClick={() => {. I want to use dataTransfer to figure out if something was pasted/dropped, without listening to each one's specific event, in order to have everything managed from the InputEvent (Because InputEvent fires for most actions I Mar 19, 2019 · I was thinking to use a React Ref to get the height but I'm getting an error: ref. Uncontrolled components leave state management up to the browser. value); (two arguments, the first one is a string), while in your custom hook you define the callback like this . 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. We can pass any parameters to a function based on our needs. currentTarget is the element which has attached the event handler. The ListItem has a number of descendant elements which will intercept the click and be the event. App. Mar 15, 2021 · However, I found that the ref. value will return nothing. It will never change. If someone could offer some insight, I'd really appreciate it. To know more see bubbling May 2, 2021 · To solve this problem, it was necessary to add only one line. log(event. Asking for help, clarification, or responding to other answers. target is [object HTMLParagraphElement],and event. Feb 20, 2022 · React events vs Browser events. To do that, capture the form element as a ref, and then call the submit() method on that element. Jun 17, 2019 · I'm not sure it's an object or not, I set the value with useState(null), but just using setPicture(e. Dec 6, 2016 · target = <input type= "text" value data-reactid= ". What am I doing wrong? Jul 28, 2022 · Simply put, the difference between them is: Event. current is still null upon logging, but if I expand the object, it contains the DOM node. const bodyHeight = this. return (. name Note the Question-Mark! They check for null/undefined and only return the value, if none of the properties (chained with dots) is null/undefined. log to see what it returns. persist(), ev. target always the first Element clicked?. Before updating the DOM, React sets the affected ref. files?. Below some code: class Calendar extends Component {. I render a number of different text fields by calling the renderHexTextField function, which takes Aug 2, 2021 · React event. target property which is a reference to the button element that was clicked. See the first log in the picture below. Feb 1, 2019 · event. The currentTarget read-only property of the Event interface identifies the element to which the event handler has been attached. I specialize in React, Node. If you need to access the other properties of event, a more comprehensive solution involves using the & type intersection operator: Oct 9, 2018 · You should pass a value to the this. In the renderCharactersLeft function I get the following error: This doesn't really surprise me since the default state 'charsLeft' is set to null, but I wonder how you would bypass or solve this message Jan 1, 2021 · React events. const onChangeFormInputsHandler = (e: React. SyntheticEvent (which extends React. An event. id} className='nav__tab'>. 1. May 7, 2022 · Hello! I am Tim Mouskhelichvili, a Freelance Developer & Consultant from Montreal, Canada. <OutsideClickHandler. blur(); answered Dec 19, 2016 at 15:22. Jan 29, 2019 · you're calling onChange like this onChange(name, event. const ref = React. Actual Behavior The target key consistently has a value of null. relatedTarget. will need to pass the event to the function know wich is the target. The target property returns the element where the event occured. Maybe you could try to extract the key and the value before calling setNewMovie : const key = event. Jim J. After updating the DOM, React immediately sets them to the corresponding DOM nodes. From MDN: Element, document, and window are the most common event targets, but other objects can be event targets too, for example XMLHttpRequest, AudioNode, AudioContext, and others. This is a non-null assertion */ console. currentTarget, but currentTarget is null for these Material-UI constructed Select's. 3. Use event. Set it to a empty string. target is the element where the event occurred, event. If files[0] is not there it will set undefined which seems to be expected. name is undefined. target is null but it is not when i switch to class component? – jamesmungai Jan 18, 2020 · This is because in React uses synthetic events for performance reasons. How am I supposed to access the DOM element via my ref? At the time I want to reference it, for example inputRef. click(function(event) {. setState is async, so it won't update the value immediately. and. getBoundingClientRect(), it's always shown as null. 2. Aug 21, 2020 · I'm new to React and been trying to fix this for hours. value is showing undefined async function initiateChat(event) { Jan 20, 2022 · The idea is to get the value of the "value" attribute from the event. target is the lowest child of the listener that the event is attached to, which you can't guarantee is a specific type of element. Feb 6, 2020 · Before you call setState you're going to want to grab the value of event. setValue(event. Sep 30, 2022 · When currentTarget works, the console. const handleSetFileName = (event: ChangeEvent<HTMLInputElement>) => {. There are some syntax differences: React events are named using camelCase, rather than lowercase. daninthemix. react-click event has empty event. When I click on for example the "Delete" span, the event does fire, but I am getting "undefined" from event. 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. So either call onChange with one argument (the event) : Jun 12, 2022 · Conclusion. document. This is for performance reasons. function handleChange(e) { setValue(e. countUpdate. current. Hi Thiago Lessa, I have tried the same thing, but still React 调用了传递给 <button> 的 onClick 处理函数。 定义在 Button 中的处理函数执行了如下操作： 调用 e. 2k. Note: Apr 10, 2012 · Here event. const files = event. Dec 27, 2022 · 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". useRef<SomeType>(null); // 'any' also works const anchorRef = React. As such, you cannot access the event in an asynchronous way. answered Jul 20, 2021 at 14:20. You still would have to assert the type of event. name} iconUrl={icon. 0. onBlur(event) }) What you are seeing is the first method that catches the real element Dec 4, 2013 · If anyone is trying to use event. createRef(); displayCurrentTimeLine = () => {. The event. persist() but the random behavior still remains. target!. The SyntheticEvent is pooled. With JSX you pass a function as the event handler, rather than a string. So even if you switch to using the second param in your handler, it probably won't work. Apr 13, 2022 · const relatedTarget = event. Implement the logic inside that function (use alert to show the message). This component takes a component outside of which you want to detect a click event. 👍 7. event. value}); Jan 25, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Those exist on the input. value); } it's expecting one argument, an event. </button>. setState({password: event. I'm trying to get the id of the button which is clicked But this only gets the id around 20% of the time and the rest it returns nulltext. target returned undefined. on("click", "p", function(e) {. this. Feb 24, 2018 · As per DOC: The SyntheticEvent is pooled. target is null. log("IDFEEDING::" + this. Instead, most people seem to be using the eventKey param like this: event. Feb 7, 2017 · To cite one of the React core developers - Sophie Alpert. currentTarget gets very specific Typescript information. React uses SyntheticEvent for events passed into event handlers and SyntheticEvents are pooled. value); }; Here handle change is just a normal function, so it is not required that you only have to pass event as your parameter. value) }} />. // current and related are null here. $(". There are some syntactic differences: React events are named using camelCase, rather than lowercase. Read about it here: From the docs: Note: If you want to access the event properties in an asynchronous way, you should call event. But the div doesn't have the properties selectionStart and selectionEnd that we want to access. In my code it worked like this: I created a variable that received the HTML event, then created a variable that received all the event files and used the 'item' functionality at index 0, and then I was able to access the file. How can you update this. Mar 15, 2020 · This is from React docs: If you want to access the event properties in an asynchronous way, you should call event. persist () #2857. Description. id. gfranko commented on Jan 14, 2015. target null in React event handler. Feb 29, 2024 · The logical AND (&&) operator makes sure the address property is not null, that num exists on the address object and is a number before comparing it to the number 50. target Aug 21, 2023 · This is happening because TypeScript doesn't automatically infer the type of the event target when you access event. console. Hence, to reliably blur the button I needed: event. target!" is defined and that value field can be safely accessed. I read about event pooling in react, so I added e. Closed. files has a type FileList | null, there's no way around it. Because if you set a new value with the arrow function directly in the html tag, typescript will understand by default the type of event. When it doesn't work, it logs the currentTarget with both the button and svg icon child. currentTarget); }; This logs the input and then the div. After using ev. that means the the value is not being set in State – Joe May 16, 2020 at 21:11 Feb 26, 2018 · I am trying to use e. const eventType = event. I have the name of each image displayed on the screen, and I want the URL to be saved in state, when someone clicks on the name of the image. listener and e. e. Thanks for all of the clarification though! – Lauren Boland. Your button does not have a value, therefore . target is the element that triggered the event. Instead of Jan 4, 2017 · When an event bubbles then event. Star 222k. /* Fails! event. value; And then setNewMovie((prevState) => { return Apr 23, 2019 · event. See (shortend URL that StackOverflow doesn't like). The React-Types should be used with React-Elements. curentTarget is [object HTMLDivElement]: So . target can be used in a React component to handle a button click event: jsx. currentTarget when the event handler is called during the bubbling or capturing phase of the event. An event handler is simply a function that will be called when the event is raised/fired/emitted. export default function Form() {. If you're seeing this, you're accessing the property `nativeEvent` on a released/nullified synthetic event. target to an appropriate type. It depends on exactly where the user clicks. The target property returns the element on which the event occurred, opposed to the currentTarget property, which returns the element whose event listener triggered the event. current to be null, hence the complain. From the event pooling section of the docs: The SyntheticEvent is pooled. feeding); Mar 30, 2020 · 1. Event. clientHeight; // current is null. Activate Lasers. React onInput - IE9/10 event. Does the state need to have null instead of undefined? In that case you could use event. Usually, you will access refs from event handlers. target is the node from which the event originated, and event. value); }}> Or by checking that event. target instead if not? Mar 19, 2021 · console. Oct 11, 2014 · React pools event objects for performance reasons. props. state based on the value of the event target? handleEvent(event) {. Jan 22, 2022 · So, this is simple. value not retrieving value properly. Dec 10, 2019 · I'm trying to convert a react project into TypeScript. In addition, React event handlers appear inside curly braces. target IS a form element. emit(event. Add onClick={handleClick} to the <button> JSX. If you want to do something with a ref, but there is no particular event to do it in, you might need an Effect. Dec 17, 2018 · I am curious why is e. I'm new to React and have run into a problem building a simple form component. By default react has a pool of events and it keeps using them. The problem is that the tags are dynamically-generated, so you have to hoist the scope, and attach the event listener to an element that is not dynamically generated. BaseSyntheticEvent) is exactly the same DOM-EventTarget as the DOM-Event uses. The thing is, closest works if I try to target the '. type; // => "click". FormEvent<HTMLInputElement>, key React normalizes events so that they have consistent properties across different browsers. currentTarget. target is defined before accessing it: Nov 1, 2020 · I believe the Typescript compiler infers the type of anchorRef. But still event. dataTransfer); // This is null. Dec 29, 2016 · the notation you are using is valid only for form elements and when event. try: <button onClick={(e) => clickHandler(e)} key={icon. From the docs:. I take it this is because the event is stored then re-dispatched later, and React nulls out the currentTarget after the initial dispatch. When I click on one of the image names, I get null undefined. cities"). In this guide, we learned that, An event. value}; }); You can make it show a message when a user clicks by following these three steps: Declare a function called handleClick inside your Button component. This is set to null. Provide details and share your research! But avoid …. src}/>. I don't know React, but I don't think your problem has to do with it. It just seems like an expected behavior (based on vanilla HTML/JS) that isn't working. value = test currentTarget = null. Let’s first use a modal to demonstrate their use case: Here is a simple demo. All of them are effectively identical: handleEmailChange(event) {. IIRC nulling it out is consistent with what happens on native events; if not, let me know and we'll reconsider our behavior here. Event names are written in camelCase, so the onclick event is written as onClick in a React app. 0"> target. log(e. Jul 31, 2020 · 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. js & TypeScript application development. This is needed because if the reference is nullish (null or undefined), the optional chaining operator (?. You no need to type if you do this: <input onChange={(event) => { setValue(e. setState({email: event. This means that the SyntheticEvent object will be reused and all properties will be nullified after the event callback has been invoked. state. Event Pooling. currentTarget = currentTarget. That means you have to ask the browser to reset the form inputs. So, you should do: Jun 30, 2019 · Note: this is incorrect. This will not always be the same as the element on which the event was fired, because the event may have fired on a descendant of the element with the handler, and then bubbled up to the Apr 7, 2023 · Event: target property. 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. nativeEvent; console. target of an event is not an Element (you can add event listeners to XMLHttpRequest, for example, and XMLHttpRequest does not have a getBoundingClientRect method). parentNode; } Examples: 1. files; React reuses the synthetic event object so you can't use it in an async context as it is. 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. Thanks! 0. currentTarget is null even with event. blur(); event. For example, the HTML: <button onclick="activateLasers()">. id, value = event. Oct 28, 2022 · 0. [0] || null Dec 31, 2020 · I want to get the value of that particurlar label but in the console i'm only getting the event. The code below is an input field that counts how many characters that is being inputed. type); // => "click". There are four input fields and four matching onChange handlers. You can pass the icon like second parameter to the function too. May 16, 2020 · Also, I realized that the event. But in both cases, event. answered Feb 6, 2021 at 20:24. Mar 6, 2015 · 134. Mar 20, 2015 · function getParent(event) { return event. Do you know why the e. To register an event handler for the capture phase, append Capture to the event name; for example, instead of using onClick , you would use onClickCapture to handle the click event Sep 19, 2020 · TS is telling you that your ‘files’ array may have null values. Without the cast, event. ) will return undefined and TypeScript doesn't allow us to compare undefined to a number. target as something like a HTMLElement to provide access to HTMLElement methods such as matches(). Nov 14, 2020 · emitWordCount(event: { target: HTMLInputElement }) { this. Is there any reason for this? Here is my jsfiddle. @BenRacicot The text of the question says How do I get a specific child element from the output? which is what the answer above tries to solve. body. To Mar 9, 2022 · I think there might be a problem with the fact you capture a reference of the event inside the closure of setNewMovie, which may cause the reuse of the event. To resolve this issue, you can explicitly typecast the event. target is null */ setState(function() { return {text: event. js. relatedTarget = relatedTarget. const anchorRef = React. setState({focused: false}, () => {. Jan 15, 2020 · And the following is the function onInput: event = event. The event handlers below are triggered by an event in the bubbling phase. useRef(); function reset(ev) {. Jul 25, 2020 · When I click the button, e. name in react to set the state as I have done before, however e. Jan 24, 2019 · However, when I set const { name } = event. <Tabs iconName={icon. style), because the . It is different from Event. target and send it to the modal so it can show different content depending on that value. Here is an example of how event. currentTarget is null (all other properties are kept intact). Sep 28, 2023 · Event: currentTarget property. target isn't necessarily the element that your listener is attached to. calendarBodyRef = React. . With JSX you pass a function as the event handler, rather event. // Next handlers in flow will not have null values. OnChange event not firing on IE 11 for ReactJS component. value); } This assumes you are only interested in the target property, which is the most common case. React event. import OutsideClickHandler from 'react-outside-click-handler'; Now You have imported a component from this module. files[0]) still gives undefined – akano1 Jun 17, 2019 at 10:36 Handling events with React elements is very similar to handling events on DOM elements. Feb 27, 2020 · React versions before 17 (and React Native) use event pooling. Copy code. It doesn't inherit from Element because not all event targets are elements. currentTarget, on the opposite, refers to the node on which current-event listener was attached. For those events, we basically use the following syntaxes: const handleChange = (event) => {. currentTarget and later log it in the function, the name variable is coming back as 'currentTarget' instead of the name attribute I assign in in my renderHexTextField function, and the value is undefined. targetis typed as EventTarget which is why you are not seeing matches() or other HTMLElement methods being available. let cityName = event. So it takes an event object from the pool, sets properties on it, calls your handler, and then sets all of the properties to null so it can be reused. A fix for it would be to explicitly set the type for the current field, e. So because target may or may not be a Node like I want, TS can't infer the truth, and I need to assert. thanks! Jun 5, 2023 · Right, but in a standard HTML Select, you can get the id of the select from event. } Jan 29, 2018 · You can use the documentElement. So rather than creating new SyntheticEvent objects, these pooled objects are reused and all properties will be nullified after a callback is invoked (see React docs). file?. May 8, 2017 · It's possible, for example, that the . target. target is not the element I set event Listener on. If you must keep the original synthetic event around, use event. Mar 22, 2018 · Now "Optional Chaining" is supported, this is the easiest and most secure way of working with potentially null-able values: You simply write: nativeElement?. . Mar 3, 2018 · This happens because of event pooling on the React side. 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]. 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. Bug: event. name prints the correct button name, even though currentTarget returns null Jan 14, 2015 · 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. The target property is read-only. Can we c Sep 11, 2020 · First, the signature of onSelect is (eventKey, event) => , but in my testing the second param is not useful (target is null). closest(), but it keeps returning null, even though the selector is definitely valid. We know that it is an HTMLDivElement. – ggrigh. updateID = ({ id, name }) => {. 566 3 13. Using event. [0] can be used. currenTarget null within the Input Event. getAttribute('data-username'). querySelector() method. Feb 7, 2021 · Alternately, I think the event is passed by default, without needing you to reference it in your source, so you can just do onChange = {handleChange}. I provided some examples below: // Gets clicked element with class "cities"'s value. function MyComponent() {. preventDefault(); Sep 4, 2018 · There is a catch to how event objects works in React. When you use setState with the new (in React 0. value be a string. Thank you for advice. 17. current values to null. Jan 14, 2015 · Fork 45. target in React and finding a null value, it is because a SyntheticEvent has replaced the event. stopPropagation()，阻止事件进一步冒泡。 调用 onClick 函数，它是从 Toolbar 组件传递过来的 prop。 在 Toolbar 组件中定义的函数，显示按钮对应的 alert。 Oct 27, 2018 · 2. addEventListener("click", getParent, false); returns the parent element of the current element that you have clicked. value. App' className, but it just won't work within my component. In your example, what you need to do is provide the value you are trying to fetch. I changed and it also works. Aug 14, 2019 · 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. currentTarget); }); Mar 2, 2022 · So I decided to go the route of using e. ih zw ec cy mk ht ow dq ww ye
React event target is null. answered Jul 20, 2021 at 14:20.