我有一个组件,该组件列出了当前的todo,您可以添加自己的todo's and删除todo,该木材正在100%起作用。我面临的唯一问题是更新我当前的托尔托。我在下面添加了必要的代码,将不胜感激。
我正在使用Proptypes,可以看到我在控制台上有警告,我怀疑可能是问题所在。这是警告:
Warning: Failed prop type: The prop `editTodo` is marked as required in `TodoItem`, but its value is `undefined`.
in TodoItem (at Todos.js:10)
in Todos (at App.js:83)
in section (at App.js:82)
in Route (at App.js:75)
in main (at App.js:73)
in div (at App.js:72)
in Router (created by BrowserRouter)
in BrowserRouter (at App.js:71)
in App (at src/index.js:7)
这是我的编辑待办按钮:
<div id="card-item-edit">
<button
className="edit-btn"
onClick={() => this.toggleForm()}>
EDIT
</button>
{this.showEditTodoForm()}
</div>
在我的编辑todo按钮中,我分配了一个切换函数ONCLICK,如果true:
,它将打开输入字段 toggleForm = () => {
if (!this.state.isShowing) {
this.setState({ isShowing: true });
} else {
this.setState({ isShowing: false });
}
}
通过状态并打开此形式onclick
showEditTodoForm = () => {
if(this.state.isShowing) {
return(
<div>
<form onSubmit={this.handleFormSubmit}>
<input
type="text"
name="edit todo"
placeholder="Edit Your Todo"
value={this.state.value}
onChange={this.onChange}
/>
</form>
</div>
)
}
}
onsubmit使用Axios更新值。我想我可能在这里做错了什么,我尝试与Postman进行测试,但无法使其正常工作,这是我的thangerformsubmit函数:
handleFormSubmit = (id) => {
const title = this.state.title;
event.preventDefault();
axios.put(`http://localhost:3004/todos/${id}`,
{
title
},
)
.then(() => {
})
.catch(error => console.log(error))
}
我还使用表单提交中的onchange属性,这是函数:
onChange = (e) =>
this.setState({
[e.target.name]: e.target.value // demo react tools to show what happens when value changes when typing
}
);
设法通过Codementor的在线导师解决了这一问题,强烈建议任何遇到此类问题的人推荐此资源。这是解决方案:
编辑todo表格,使用ref的传递状态:
showEditTodoForm = () => {
const { title} = this.props.todo
if(this.state.isShowing) {
return(
<div>
<form ref={this.formRef} onSubmit={this.handleFormSubmit}>
<input
type="text"
name="title"
placeholder="Edit Your Todo"
defaultValue={title}
/>
<input type="submit" value="Save" />
</form>
</div>
)
}
}
handleFormSubmit = (e) => {
e.preventDefault()
const title = this.formRef.current['title'].value
const { id } = this.props.todo
this.props.editTodo(id, title)
}
然后,我正在使用Proptypes传递到我的主要组件:
editTodo = (id, title) => {
axios.put(`http://localhost:3004/todos/${id}`,
{
title
},
)
.then(({data}) => {
this.setState(prevSate => {
const { todos } = prevSate;
const oldTodoIndex = todos.findIndex(todo => todo.id === data.id )
const newTodo = {...todos[oldTodoIndex], ...data}
todos.splice(oldTodoIndex, 1, newTodo)
return {todos: todos}
})
})
.catch(error => console.log(error))
}