cypress input field wont get cleared - reactjs

I have a input field:
<input value="0">
which i can easily clear() and type("123") in cypress.
the value gets updated and everything is fine.
on the other side, a prefilled input field like below I cant update because cypress writes my value of .type("123") just at the beginning of the value.
<input value="1500000">
my method is the following:
.find("input")
.clear()
.type(`${input}{enter}`)
changes on the fields fire redux actions, we use redux for our whole state handling. could that be a problem?
otherwise, do you know of this issue?

Try adding an assertion to make Cypress 'wait' for the input to clear:
.clear().should('have.value', '')
.type(...)

I tested using the HTML found here and everything works fine (in the screenshot I wrote "Stefano" instead of the default value)
You hit the point when you cite React: this kind of state changes requires a bit more work to run as expected because React (and Vue etc.) obviously overwrites everything in the DOM.
You're facing a common issue where React re-renders the component as soon as an event is triggered... so you have to change the input value/defaultValue management in your React component, Google for it and you find a plethora of solutions about that 😊

Related

Formik - Update initial values after API call

I'm getting my inputs dynamically from an API call based on a change in select input, but when I try to add to the initial values of Formik, it always gives me an error ...
Warning: A component is changing an uncontrolled input of type text to be controlled.
And it doesn't help if I set enableReinitialize={true} to Formik.
However, if I generated the inputs from a local JSON or object, the error goes away.
What am I doing wrong here ...
https://codesandbox.io/s/test-dynamic-inputs-with-formik-xr9qg
The form submits fine though.
Better use enableReinitialize={true}. This is official Formik API.
You can check this issue
If anyone is facing the same issue, I just found the solution ...
You have to set value={field.value || ''} in the input inside the TextInput component or whatever type you're using in order to fix this issue.
I had a complex, dynamic form and also came across this issue. There are a few things that I'd recommend for anyone debugging this issue in the future:
Set value for your Field component--like Ruby does above.
Ensure that your Formik component has a uniquely identifying key.
Track and debug your initialValues and ensure that all fields are accounted for. You shouldn't have to set the field value like Ruby does--so long as your initialValues object accounts for all of the fields. However, my form dynamically changed Field components--and Ruby's solution is the only one that worked.
If your form is not dynamic--I think it might be best to check your initialValues object first before implementing Ruby's solution. Formik should be taking care of those values for you--which is why it's such an awesome tool.
i've checked with enableReinitialize={true}. But its not working as much as expected. so wrote a useEffect like
useEffect(() => {
formik.setFieldValue('query_string', active?.query);
}, [active])
it's worked !

Can i change input value populated from component state from console

Can i change input value populated from component state from console by using something like document.getElementById('someId').value="some_value" in react
Yes you can.
Whatever the Library/Framework you are using to build your DOM, it will eventually produce DOM, thus, it will be available and accessed as: window, document and everything inside of them.
So, doing the following will update value of the field that matches with the parameter given to the getElementById.
document.getElementById('someId').value="some_value"
I suggest you use React Developer Tools to trace and edit value of state
https://chrome.google.com/webstore/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi?hl=en
Hope this help!

Rendering variables from state stops working if innerHTML is modified

Having an issue where a 3rd party library is setting document.body.innerHTML, and that causes setState to stop seeming to work fully. In React tools in chrome and when debugging it updates the state object correctly, but the rendered output does not update.
Cannot figure out what is going on here, no error occurs, stepping through the debugger nothing stands out to me. At first I was also using dangerouslySetInnerHTML, but the issue seems to be occurring on normal jsx value injection too.
Example here, if you modify the value of const ModifyBody = true; to false and it works as expected, but with the document.body.innerHTML = it doesn't update.
https://codepen.io/eibwen/pen/gjBxrZ
Just to restate it, its a third party library doing the body.innerHTML. Specifically its a library to create a medium.com-like popup when selecting text, if you happened to know a library that could do this with better compatibility with TypeScript/React I'd be all ears on that too

react willReceiveProps workaround for external library

I'm using a react datepicker component that can be found here. The component is pretty great except for what appears to be an oversight: it does not implement willReceiveProps.
To expound, I create the datpicker as below:
<DateField
dateFormat= { dateFormat}
forceValidDate={true}
defaultValue={startDate || ''}
onChange={this.handleChange.bind(null, 'start_date')}
id="start"
>
<DatePicker
navigation={true}
locale="en"
forceValidDate={true}
highlightWeekends={true}
highlightToday={true}
weekNumbers={true}
weekStartDay={0}
/>
</DateField>
Note above that there is a prop defaultValue which I pass startDate. Now, startDate can and does change for reasons that are sometimes external to the component. That value is passed during a new render() action as per usual. According to react philosophy this shouldn't be a problem.
However, it appears to me as if the value from defaultValue is only ever read once inside DateField. It is read as this.props.defaultValue. Anyone who has ever built a component relying on props should quickly recognize this is a problem. It means that when the prop is changed the new value will not be used.
Because this is a library, I cannot simply implement willReceiveProps. Does anyone know of a good workaround to get this component to either completely reset on a render or some other strategy to deal with what seems to be a big design problem?
They follow the same standards as the <input> component. defaultValue is read only once but there is also value that can be set externally. There is no need for them to use willReceiveProps.
In short, use value instead of defaultValue.
See Uncontrolled Components in React
PS: I am looking a bit into the code and it seems there are also properties text and date apart from value. Since the code (and documentation) has been removed from github, I won't inspect what is the difference between those props.

Input field and React where Input field is not editable because of react id in attr

I have a specific need to only make one input field in a form (legacy code) a react component. So, I wrap the input with a div and render into it the 'new' input field that needs some special behavior.
The problem arises because the input field is no longer editable. I try to type into it.. nothing. I narrowed it down to the following:
<input type="text" **data-reactid=".2.0.0.0.1.0.0.1.2.0"**
When I remove that "data-reactid....", by editing via console, it works.
So when I am using react to sub out one form input field with a react one, it doesn't work unless I manually remove that data-reactid..
Is there a workaround for this, or a reason why this is happening?
Well its just a data attribute written by react to help them render into the DOM more efficiently so it should have no real impact on a input element or any element (unless there is code or style explicitly disabling the input) - I realize that this is no real help - because it happens to you, but this is not typical of react apps with inputs or element with data-attributes.
But if its the only bit of react on the page then that id is a bit long and I would have expected something like ".0" or ".0.0" if its wrapped in a div that react controls.
The react-id is only used by the React engine to work out what elements of the DOM need to be re-written when there are changes to state or props in your components.
One thing I noticed is, typically there would be an ID or in react a ref that you applied to the input in order to interact with it (such as getting its value).
I include the mark-up from a simple entry box on the user login form of a working app, as you can see it's not significantly different from what you have and works on all browsers Windows and Mac down to IE8 included.. (but not any IE below 8) and you need various shims for getting it work on IE8.
<input class="username-text-field" id="user-id" type="text" data-reactid=".0.0.0.1.3.0.0.2">
If none of these apply or you have them covered then practicably here should be no reason why your input should be disabled. It should just act like any other input. Have tried just dropping you component onto a simple HTML page with only the input on it, just to debug through the component in isolation?
That said,
It does feel that loading the entire React engine and wiring up a component to allow a single input field is a little over-kill. I realize that you're trying not to have to recreate exactly the same functionality you already have in react again on the legacy form, but if your render function is not too onerous then maybe a simple bit of JavaScript or JQuery might be the answer as a one off in the legacy solution (rather than the hit for the library) - just a thought

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