我想在调用onClick
函数之前验证表单。我已经使用react-hook-form
组件来实现表单验证。但是,它似乎不起作用。即使当表单为空时,如果我单击按钮,也会创建一个空组件。
我是一个初学者,可以做出反应。 该项目来自Udemy课程,我想进行一些改进,即表单验证。
import React, { useState } from "react";
import AddIcon from "@material-ui/icons/Add";
import Fab from "@material-ui/core/Fab";
import Zoom from "@material-ui/core/Zoom";
import { useForm } from "react-hook-form";
function CreateArea(props) {
const { register, handleSubmit, errors } = useForm();
const onSubmit = data => {
console.log(data);
};
const [createNote, setCreateNote] = useState({
title: "",
content: "",
});
const [isExpanded, setIsExpanded] = useState(false);
function updateChange(event) {
const { name, value } = event.target;
setCreateNote((prevNote) => {
return {
...prevNote,
[name]: value,
};
});
}
function submitNote(event) {
props.onAdd(createNote);
setCreateNote({
title: "",
content: "",
});
event.preventDefault();
}
function expand(){
setIsExpanded(true);
}
return (
<div>
<form onSubmit={handleSubmit(onSubmit)} className="create-note" >
{isExpanded && <input
onChange={updateChange}
value={createNote.title}
name="title"
placeholder="Title"
ref={register({ required: true ,maxLength: 15 })}
/>}
{errors.title && <p>Title is required</p>}
<textarea
onClick={expand}
onChange={updateChange}
value={createNote.content}
name="content"
placeholder="Take a note..."
rows={isExpanded ? "3" : "1"}
ref={register({ required: true })}
/>
{errors.content && <p>Content is required</p>}
<Zoom in={isExpanded}>
<Fab type="submit" onClick={submitNote}>
<AddIcon />
</Fab>
</Zoom>
</form>
</div>
);
}
export default CreateArea;
答案 0 :(得分:1)
我不确定我是否完全理解该问题,但是如果您想在 expand 函数中验证表单,并根据其是否有效采取行动,请对表单进行响应具有 triggerValidation 函数,该函数为此目的返回一个承诺。
const { triggerValidation } = useForm();
function expand() {
triggerValidation().then(valid => {
if (valid) {
setIsExpanded(true);
}
});
}