I have an array in localstorage and I am maping the array to render it's data into list. I want to add button next to every element in the list and if I click the button the specific element gets deleted from the array in the localstorage.
Is this possible and how can I do it?
Using -> Javascript and React code here:
//This array is in the localstorage
const reptiles = ["alligator", "snake", "lizard"];
function ReptileList() {
return (
<ol>
{reptiles.map((reptile) => (
<li>{reptile} /*THERE SHOULD BE THE DELETE BUTTON*/</li>
))}
</ol>
);
}
Add some reptiles in the localStorage:
// in the Browser Console
localStorage.setItem( "reptiles", ["alligator", "snake", "lizard"] )
Or add some other functionalities to Add reptiles from the UI.
import "./styles.css";
import { useEffect, useState } from 'react';
export default function ReptileList() {
const [ reptiles, setReptiles ] = useState( [] )
function deleteReptile( name ){
// Fin the index of the reptile
let index = reptiles.indexOf( name )
// if reptile is found
if( index !== -1 ){
// remove it from state
reptiles.splice(index, 1 )
// update localStorage
localStorage.setItem( 'reptiles', reptiles )
// update reptiles State to re-render the list
setReptiles( [...reptiles] )
}
}
function readReptiles(){
// read from localStorage
let reptiles = localStorage.getItem( 'reptiles' )
// if no reptiles in localStorage initialize with empty
if( reptiles === null ){
reptiles = []
}
// init reptiles State
setReptiles( reptiles.split(',') )
}
useEffect(() => {
// read reptiles from local storage after rendered
readReptiles();
return () => {};
}, []);
return (
<div className="App">
<h1>Reptiles</h1>
{reptiles.map( (reptile => (
<li key={reptile} >{reptile} -
<button onClick={()=>deleteReptile(reptile)}>Delete</button>
</li>
)))}
</div>
);
}
You can use these 2 functions to Get and Remove Items from Local Storage.
const getElementsfromLocalStorage = () => {
let elements = [];
if (localStorage.getItem('reptiles')) {
elements = JSON.parse(localStorage.getItem('reptiles'));
}
return elements;
};
const removeElementLocalStorage = (name) => {
let elements = getElementsfromLocalStorage();
elements = elements.filter(element => element.name !== name);
localStorage.setItem('reptiles', JSON.stringify(elements));
};
Now, when you are rendering the list, render a button with every list item and call the function removeElementLocalStorage when the button is clicked with the value.
<li>
<span>{reptile}</span>
<button onClick={() =>removeElementLocalStorage(element.name)}>Remove</button>
</li>