So I have a submit form where the user needs to create a task by typing in a task name. I want it to be empty at the beginning and have a placeholder of "you must enter a task" when the user click add without entering anything. Now I can achieve it to display the placeholder but it's either always there or I encounter unreachable code. I know how to clean the submission & return to the add function, just need to be able to display the placeholder conditionally. Here's what my code looks like atm:
import { useState } from "react";
export default function Todos() {
const [todos, setTodos] = useState([{ text: "hey" }]);
const [todoText, setTodoText] = useState("");
const [isEmpty, setEmpty] = useState("false");
const addTodo = (e) => {
e.preventDefault();
if (todoText){
setTodos([...todos, { text: todoText }]);
setTodoText("");
} else {
setEmpty(true)
setTodoText("");
return
}
}
return (
<div>
{todos.map((todo, index) => (
<div key={index}>
<input type="checkbox" />
<label>{todo.text}</label>
</div>
))}
<br />
<form onSubmit={addTodo}>
<input
value={todoText}
onChange={(e) => setTodoText(e.target.value)}
type="text"
></input>
<button type="submit">Add</button>
{isEmpty &&<span style={{ color: "red" }}>Enter a task</span>}
</form>
</div>
);
}
I could change your code with the following:
You need to initialize isEmpty by false instead of string "false".
And you can use this flag on showing placeholder texts.
Note that I renamed isEmpty by showError.
import { useState } from "react";
export default function Todos() {
const [todos, setTodos] = useState([{text: "hey"}]);
const [todoText, setTodoText] = useState("");
const [showError, setShowError] = useState(false);
// @ts-ignore
const addTodo = (e) => {
e.preventDefault();
if (todoText) {
setTodos([...todos, {text: todoText}]);
setTodoText("");
setShowError(false);
} else {
setTodoText("");
setShowError(true);
return
}
}
return (
<div>
{todos.map((todo, index) => (
<div key={index}>
<input type="checkbox"/>
<label>{todo.text}</label>
</div>
))}
<br/>
<form onSubmit={addTodo}>
<input
value={todoText}
onChange={(e) => setTodoText(e.target.value)}
type="text"
></input>
<button type="submit">Add</button>
{(showError && !todoText) && <span style={{color: "red"}}>Enter a task</span>}
</form>
</div>
);
}