GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Even if probably not relevant, for clarity, data is read and written through some REST calls and the code is mostly based on this.
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And this is what happens, as long as the initial state of value that is, this. In this case, every time I click the checkbox, this. If instead the initial state of value is true and I click on it, this. Clicking on it again will call this. I've tried many possible combinations to see if there is a different scenario which may cause the same problem, but it seems that's the only case. Did this work in previous versions of React?
Thought probably not needed, I can also share the project, but it wouldn't work out of the box, as it's a work I'm doing to extend the back-end of a WordPress plugin.
You would need to have a value on the input to start with. Basically, the first click applies a value, and then forward there is a value to change.
But I do have a value. As I fear I wasn't clear enough or maybe I misunderstood your commentI've uploaded here a screencast of the issue. Sorry, I wasn't clear enough. This doesn't have anything to do with React, the DOM node does not have a value property. As soon as I set the value attribute, the checkbox always displays as unchecked: no matter what's the original value in the DB.
All the above have the same effect: the checkbox always loads as unchecked, even when the value is true verified by logging the props in the console. At least, the onChange always gets fired now, but I can't use it this way, of course. BTW, I don't feel like this is a bug, but instead an area of React where behavior could be normalized a little better. Good luck, and cheers!React Events And Two-way Data Binding Tutorial
If i try this on mobile, the onChange method no longer invoked. Are you seeing the same behavior? Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up.
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onChange event. Get an event when the content changes
I'm not sure if that's a but or more likely just a lack of knowledge. The fact I started fiddling with React only a couple of weeks ago might be a hint. Anyway, the code below is meant to display a checkbox. This comment has been minimized.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
Already on GitHub? Sign in to your account. However, it actually fires when the radio button is clicked. In other words, it fails to fire when a checked radio button is unchecked by checking a different radio buttonand it fires even without a state change when a checked radio button is clicked. Essentially you're getting a change event for the radio group rather than for the individual radio button. I guess that makes some sense I'm not sure it's ideal, but it's what the DOM does too If someone wants to tackle this, it would be nice if "changing" from checked to checked didn't trigger an onChange event.
I'm also happy to accept a docs PR to make the expected behavior clearer. Right now ChangeEventPlugin fires an onChange event for every click that it receives from the browser for both checkboxes and radio buttons.
My guess is it's necessary to track the current value when the focus event is triggered, sort of like we do for activeElementValue in old IE. Not sure how tricky it will be to solve. I can take a look closer to the weekend, OK? This forces us to abort the onChange when 'this' radio is the selected value, which is just ugly. I'd like to try this as my first PR for React. It was a nightmare, I spent over 12 hours just trying to get it working, even with help of some people on the react IRC channel, with no success.
EtaiG Sorry for the delay. If the change is simple, we can take it without tests and if it's complex, maybe I can write some. Do you want to post a PR with your code as it is now? I'll make a PR tomorrow It Looks like I deleted my changes in my local react clone since.
Though I still have my test written even though I can't run it :. Anwyay, I merged react's master locally and checked the code again, so I'll explain the problem and the possible solutions PR later if you want.
Sorry for it being lengthy, but I think this should clear up what's going on and how we can move onwards from here to get the radio to work according to the spec. The problem is caused by the fact that react uses the native click event to listen to user interaction with the radio, and then calls the onchange for the input.
The reason for this at least according to the comment in the code is because IE8 does not fire the change event until blur, so in order to be 'compatible' with IE8, the click event is used. There is a tradeoff- supporting IE8 for a normal radio, while losing the W3 standard for radio, and also causing anyone who uses react and wants to specifically know when the radio selection has changed, to have to write more stateful code.
It's not possible to try and check the DOM for the value, since the 'click' event arrives after the change already occurred. I personally like 3 the most, but 2 is good too. Maybe there's something else I didn't think of. For what it's worth, we're running into this, too. I saw some code that relied on onChange firing even when the checkbox was already checked, so I wanted to know whether that was intentional, stable behavior.
Sounds like no. If we only use the stored state to decide whether the click event is really a change, then we won't, like, deadlock the checkbox and make it ignore inputs. Worst-case scenario, if someone screws with the state underneath us, we miss an onChange bad or fire a redundant one not as bad :P. My gut says that most apps can recover from that. And, even then, I think programmatic changes fire onChange events?GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. That it works sometimes suggests that itas due to the polyfill needing focus of the inputs I would think the context menu version steals focus? Instead of onChange use onInput. I have tested it and its working fine for me. This issue is still present in version Only IE 11 seems affected, Chrome and Edge work fine.
My team also verified this on Pasting with the keyboard works fine. We are using onInput instead now, as others have mentioned. Not sure if this is the right thing to do, but it's the only option until this gets fixed.
Is the suggested approach for this in the meantime to use onInput rather than onChange? I'd be interested to know the side effects of using onInput if anyone could point them out. Checkout this answer I think it will helps to resolve issue. I am still able to reproduce this issue on IE11 and However, right-click mouse to paste does not trigger an onChange. After reading this thread, it seems like this was fixed in masterthough still doesn't seem to be in a stable release.
Any update on this?
OnChange event not firing in React MDBDatePicker
I'm not sure what changes in master are supposed to have fixed nhunzaker do you know? You can try using the latest master builds available here to see if the issue is actually resolved in master. If it is, the changes may be part of a major release, but again I'm not clear on that yet. It may be part of which is slated for We're getting to a phase where we are unlikely to spend any effort on I know this is frustrating and we're also looking for a way to spend more time on DOM issues in the future.
But right now our focus is ensuring React continues to be relevant in the coming years, and we think Fiber is best shot at it. So I'm sorry this kind of stuff is slipping through the cracks. First let me say that ya'll are great, and work super hard, thank you for everything.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
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Already on GitHub? Sign in to your account. When a controlled input element changes by updating it's value, onChange isn't called. This is written in the docs and also mentioned in various threads such as comment and comment. The fact that the inputs onChange function not gets called is a problem to me, because I need to do logic such as validation when the inputs have changed.
The problem why your input is always empty is that you didn't dispatch any action to change firstName inside props, except the click button. Hi eduardbcomyeah of that I know. You don't get one when you are updating the value if you are not touching the input. I'll update my codepen so this is more clear by adding the functionality you thought was missing. Thanks for the report pudgereyemthe example was really useful! This is expected behavior. The onChange event handler is meant to act like a typical event handler does, meaning its only invoked when the DOM dispatches the appropriate event.
If the value is coming from props then you can always check the new value in componentWillReceiveProps. Got it! Yes, it's an interesting discussion I think. I understand that it's now only meant to be a standard event handler. However, the input did change, so it would be neat if onChange would trigger also. Hi aweary and eduardbcom. Achieved using componentWillReceiveProps as suggested by aweary.
One great example is a sign-up form where you have to pick a username or type in an email address or something.
Before the user gets around to pressing the final submit button you might want to alert them early that their chosen username is available or already taken. Or you might want to alert early that the typed in email address is not a valid one. If you execute that kind of validation on every key stroke, it's unlikely to be a pleasant UI. Problem is, you can't do that in ReactJS.
OnChange event not firing in React MDBDatePicker
It doesn't work like that. The explanation is quite non-trivial:. When the user updates the input, the node's value property will change. However, node. Unlike HTML, React components must represent the state of the view at any point in time and not only at initialization time.
Basically, you can't easily rely on the input field because the state needs to come from the React app's state, not from the browser's idea of what the value should be. But what you notice is the the onChange handler is fired on every key stroke. Not just when the whole input field has changed. Same snippet but using onBlur instead. Follow peterbe on Twitter. Nice, worked for me. Could you perhaps elaborate on why onBlur works, and what is the actual use case for onBlur? Thank you!It is being correctly initialised by Materialize, but not firing onChange when the value of the datepicker changes.
What am I doing wrong here? This problem seems to extend to all Materialize inputs. I'm pretty sure this solves the caveat if you put it in your componentDidMount component. If the select is to be re-rendered on state change, this should as well be put in componentDidUpdate. To get the value of the datepicker in materialize they provide an onSelect option when initialising the component:. When you close the datepicker which is actually a modalthat's when the onChange fires, in this case logging 'onChange triggered' to the console.
It looks like you're using materialize directly in your post but if it is possible, you could try using react-materialize as it wraps all the materialize components such that it's easier to use with React. Using react-materialize would probably be the cleanest way to handle state and event changes as they provide a convenience wrapper around each materialize component.
When using the date picker from react-materializeyou'll need to pass the handleChange method into the options prop like so:. In the case of using the materialize date picker independently, if you could provide more details on how you're initializing the date picker input, I could provide a more relevant answer. But I'll give it a shot in the dark. From the materialize docs it looks like you'll also have to pass back some options when you initialize it to handle a callback function when a date is selected.
I've added a JSFiddle that has a working example as well as a code snippet below, notice that when you select a date, 'hello world' is logged in the console, and the date is the first argument passed into the callback.
So to answer your question of how to handle events and setting the state, you just need to pass your handleChange method into the provided options configs depending on how you're using materialize date picker.
Unfortunately, there is only one way to get event object: use onInputChange method in addition to keyboard property and change value of the Datepicker by the keyboard. You can find licensing details on our license page. Expected behavior OnChange event should get fired Actual behavior OnChange event is not getting triggered Resources screenshots, code snippets etc. Anna Morawska staff answered 12 months ago 0 0 Best answer.
Hi there, please use getValue prop instead of onChange. Add comment. Aliaksandr Andrasiuk staff answered 8 months ago 0 0 Best answer.
Hi, Unfortunately, there is only one way to get event object: use onInputChange method in addition to keyboard property and change value of the Datepicker by the keyboard. Probably we will implement a possibillity to get event object the easiest way. Hope it could help. Best regards. Please insert min. Specification of the issue. About author. For any technical questions please use Support You can find licensing details on our license page.
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