I am trying to display more than one task using the same react component and a map function. The components is supposed to upload a file and display the file that has been upload or is uploading with an onChange event, an onSubmit event will be added later to send the file to the back-end. Since the component is being dynamically rendered with an onChange event I am sending the li key as a parameter then only rendering the filename to the li that matches based on the key. The issue I am currently having is when I send the key in the onChange the value is not getting to the function. I have even tried setting a state for the key and then pulling that into the function but I get back undefined I have tried 100 other things as well and either get back undefined or 0. This is my first post on here and I am also just a junior dev so I may be missing info needed here if so please let me know.
Here is the code
const onChange = (e, index) => {
setFilename(e.target.files[0].name)
setArrFiles([...arrFiles, {key:index, file:e.target.files[0].name} ])
}
const displayTask = (index) => {
let upload = []
arrFiles.forEach(el => {
if(el.key === index) {
upload.push(el.file)
}
})
return upload.map((file) => (
<li key={index}>{file}</li>
))
}
{database.map((task, index) => (
<li key={index}>
<p>{index}</p>
<div className="userPortal__tasksContainer">
<div className='userPortal__tasksHeader'>
<p className='userPortal__tasksHeaderTitle'>{task.taskTitle}</p>
<p className='userPortal__tasksHeaderInfo'>{task.taskMessage}</p>
</div>
<div className='userPortal__tasksBodyButtons'>
<form className='userPortal__fileUpload'>
<input className='userPortal__inputButton' multiple id='file' type="file" onChange={e => onChange(e, index)}/>
<label htmlFor='file'>Choose File</label>
</form>
<button className='userPortal__tasksBodyButton green'>Task Complete</button>
</div>
<p id='userPortalFooterTitle'>Successfully Uploaded</p>
<div className='userPortal__footer'>
<ul>
{displayTask(index)}
</ul>
</div>
</div>
</li>
))}
The issue here was like a dummy I hard coded the input ID so when referencing the input field it would only get the hard coded value instead of the index of the component.
Here is the updated form.
<form className='userPortal__fileUpload'>
<input className='userPortal__inputButton' multiple id={index} type="file" onChange={(() => (e) => onChange(e, index))()}/>
<label htmlFor={index}>Choose File</label>
</form>
No Do It Like This
const onChange = (e, index) => {
setFilename(e.target.files[0].name);
// Okay You Need To Filter The State In Order To Get The Object With THe Current Index
// Set The File Value Of The Object To e.target.files[0].name
setArrFiles((state) => {
const allFiles = state;
const currentFile = allFiles.filter(
(file) => parseInt(file.key) === parseInt(index)
)[0];
// i converted it to an integer just to prevent further bugs
currentFile.file = e.target.files[0].name;
return [allFiles];
});
};
Related
I created this search bar for an API. As you can see, the search bar is working with an onChange event. The user is searching the movie thanks to the title. I would like to search a movie with an onClick event with the button. For example, I'm searching Titanic, only this movie must appear.
<form action='/' methode='get' className='Search-Bar'>
<input
type='text'
id='searchbar'
className='searchbar'
placeholder='Rechercher un titre, un réalisateur...'
onChange={(e) => {
setSearchMovie(e.target.value);
}}
/>
<button className='search-button'>
<AiOutlineSearch /> OK
</button>
</form>
This is my code for the filter :
const allMovies = movies
.filter((value) => {
if (searchMovie === '') {
return value;
} else if (value.title.includes(searchMovie)) {
return value;
}
})
.map((movie, index) => {
return ( .............
It's working but I don't know how to search a movie thanks to the button... do you know how can I do this ??
Thank you !
Assuming your onClick is on the button it would be something like this, where you set the value of the movie as the value of the input field.
With your onChange set a value in the component for searchFieldValue and use it with the onClick. Ps your code is only html and JS as far as i can see, not a react related issue.
<button
className='search-button'
onClick={(e) => {
setSearchMovie(searchFieldValue);
}}
>
<AiOutlineSearch /> OK
</button>
I'm developing with React.js and below is a simplified version of my component. As you can see, when I click the button state(number) would get a number. And here is what I want, make div tags as much as a number in state(number) in the form tag(which its class name is 'b').
Could you tell me how to make this possible? Thanks for reading. Your help will be appreciated.
//state
const[number,setNumber] = useState('')
//function
const appendChilddiv =(e)=>{
e.preventDefault()
setNumber('')
}
<div>
<form className="a" onSubmit={appendChilddiv}>
<input
value={number}
onChange={(e)=>setNumber(e.target.value)}
type="number"/>
<button type="submit">submit</button>
</form>
<div>
<form className="b">
</form>
</div>
</div>
I've created a codesandbox which includes the following code, previously you were storing the value as a string, it'd be best to store it as number so you can use that to map out, which I do via the Array() constructor (this creates an array of a fixed length, in this case the size of the divCount state - when we update the state by changing the input value this creates a re-render and thats why the mapping is updated with the new value)
import "./styles.css";
import * as React from "react";
export default function App() {
//state
const [divCount, setDivCount] = React.useState(0);
//function
const appendChilddiv = (e) => {
e.preventDefault();
// Submit your form info etc.
setDivCount(0);
};
return (
<div>
<form className="a" onSubmit={appendChilddiv}>
<input
value={divCount}
onChange={(e) => setDivCount(Number(e.target.value))}
type="number"
/>
<button type="submit">submit</button>
</form>
<div>
<form className="b">
{Array(divCount)
.fill(0)
.map((x, idx) => (
<div key={idx}>Div: {idx + 1}</div>
))}
</form>
</div>
</div>
);
}
You can map over an array whose length is same as that entered in input & create divs (if number entered is valid):
{!isNaN(number) &&
parseInt(number, 10) > 0 &&
Array(parseInt(number, 10))
.fill(0)
.map((_, idx) => <div key={idx}>Hey!</div>)
}
isNaN checks is number is valid
parseInt(number, 10) converts string into number,
Array(n) creates a new array with n elements (all empty) (try console logging Array(5)) - so you need to fill it
.fill(n) fill the array (make each element n)
and map is used to render different elements from existing things
So, in this way, you can achieve the mentioned result.
Here's a link to working Code Sandbox for your reference
You can do the following.
First thing it does is creates a new array of some length number.
Next, it fills that array with undefined, because creating new arrays like this doesn't really create an array of that length.
Lastly, we map over this array, we use the index as our key.
We return an empty div for each item in the array.
Note, using an index as a key isn't the best idea. In general it should be something as unique as possible. If you have data you can use that is unique, then you should use that as a key.
return new Array(number).fill(undefined).map((_, key) => <div key={key}></div>);
You can even do it without 'Submit' button. See the codesandbox link and the code snippet below:
import "./styles.css";
import * as React from 'react';
import { useState } from 'react';
export default function App() {
const [divTags, setDivTags] = useState([])
const appendChilddiv = (e) => {
const numberAsString = e.target.value;
let numberDivTags;
if (numberAsString.length === 0) {
numberDivTags = 0
} else {
numberDivTags = parseInt(numberAsString, 10)
}
setDivTags([...Array(numberDivTags)])
console.log(divTags)
}
return (
<>
<form className="a">
<input type="number" onChange={appendChilddiv}/>
</form>
<form className="b">
{divTags.map((e, i) => {
return <p key={i}>Div number {i}</p>
})}
</form>
</>
);
}
I have a function which is handler of onChange and get value of input
and also I have a function for search in an array using searched value coming from that input
and render a component that contains searched array as props.
But I have a problem
when I search it works but after second letter and when the input is empty it shows the last search.
I think it should be handled with useEffect but I dont how to solve or may be I am wrong
I need help to correct that
thanks for your help.
these are my code :
getting search value part and sending as argument :
function BasePage({handleClick, handleSearch }) {
const [searchValue, setSearchValue] = useState('');
useEffect(() => {
function handleChangeSearchInput(e) {
const newSearchValue = e.target.value;
setSearchValue(newSearchValue);
handleSearch(searchValue);
}
})
return (
<div>
<fieldset>
<legend>Search</legend>
<input
value = {searchValue}
onChange = {handleChangeSearchInput}
placeholder = "Enter name to search"
type = "text"
/>
<button onClick={() => handleClick('add-record-form')}>Add</button>
</fieldset>
<br />
{searchValue.length > 0 && <SearchRecord record = {searchValue} />}
</div>
);
}
and this filters in parent component :
function handleSearch(searchValue) {
const searchedTerm = contacts.filter(contact => (contact.name.toLowerCase().includes(searchValue.toLowerCase())));
setSearchTerms(searchedTerm);
}
and I use map to show them .
You shouldn't need useEffect for this. Just have the handler deal with both the setting of state, and the updating.
function handleChangeSearchInput(e) {
const newSearchValue = e.target.value;
setSearchValue(newSearchValue);
handleSearch(newSearchValue);
}
Hi I am new to React and I am a little bit confused on how to validate a value before passing it to the partialRefund function I have.
I am trying to set a simple validation to make sure the value is not empty and numeric before passing it to the partialRefund function.
The first line is the code I currently have. The second line is the code I am trying to write for the validation but it is not working.
Any help would be really appreciated! Thanks!
//Current code
{partialRefundSelected ? <div> <input id={`partial_refund_${order_id}`} type='text'/> <button onClick={() => partialRefund(order_deets_obj,"partialRefund",document.getElementById('partial_refund_'+order_id).value)}> Refund Order </button> </div> : ""}
//Code I am trying to use
{partialRefundSelected ? <div> <input id={`partial_refund_${order_id}`} type='text'/> <button onClick={(validateValue(document.getElementById('partial_refund_'+order_id).value)) => partialRefund(order_deets_obj,"partialRefund",document.getElementById('partial_refund_'+order_id).value)}> Refund Order </button> </div> : ""}
On the second line i am trying to pass a function that will validate the value and the pass it to the partialRefund function. But it doesnt seem to be working :(
Use this:
{
partialRefundSelected ?
<div>
<input id={`partial_refund_${order_id}`} type='text'/>
<button onClick={() => {
const validatedValue=validateValue(document.getElementById('partial_refund_'+order_id).value));
partialRefund(order_deets_obj,"partialRefund",validatedValue);
}}> Refund Order
</button>
</div> :
""}
You can do the validation in the onClick callback if you add curly brackets around the parttialRefund call.
export default function App() {
const partialRefundSelected = true;
const order_id = 1;
const order_deets_obj = { deets: "good deets" };
const partialRefund = (deets, someString, someValue) => {
console.log(deets, someString, someValue);
};
return partialRefundSelected ? (
<div>
<input id={`partial_refund_${order_id}`} type="text" />
<button
onClick={() => {
const value = document.getElementById("partial_refund_" + order_id)
.value;
// Do validation here
if (value === "I LOVE CATS") {
partialRefund(order_deets_obj, "partialRefund", value);
}
}}
>
Refund Order
</button>
</div>
) : (
""
);
}
While this is an option in react, I would suggest making your input a Controlled Component. This would allow you to keep the input's text in state instead of needing to pull the text off of the element after a click. Here is an example.
what would be the reason I lose the value on the inputs when I try to add another one,?
in the component I set the useState with an array of an empty string, and when I click the add button it ads another slot in the array, but every time I add a field, the value in the rest of the form is reset and lost. I believe the app is re-rendering.
const IngridientsInputField = () => {
function newIngridient(event) {
event.preventDefault();
setStateIngridients([...stateIngridients, ''] )
setStateCounter(stateCounter +1)
}
return (
<div className="ingridients">
<h3>number of ingridients {stateCounter}</h3>
{ stateIngridients.map(() => (
<input type="text" name="ingridient" title="ingridient" placeholder={`ingridient (example: pineapple)`} />
))
}
<button onClick={newIngridient}>add + </button>
</div>
)
};