复选框更新请求，反应JS

Question

我正在制作简单的待办事项列表应用程序，一切都在工作。我只是想确保我做对了，没有任何错误。 我担心复选框更新部分，请检查代码并告诉我我是否做错了什么。

这是复选框的放置方法

checkBoxRouteUpdate = () => {
let {todos} = this.state
let newArray = [...todos]
axios
.put(`http://localhost:8080/checkEdit/`, {
checked: newArray.every(todo => todo.checked)
}).then((res) => {
console.log("res", res);
})
.catch((err) => {
console.log("err", err);
});
}

检查所有这些

checkAllCheckBox = () => {
let {todos} = this.state
let newArray = [...todos]
if (newArray.length !==0) {
newArray.map(item => {
if (item.checked === true) {
return  item.checked = false
} else {
return  item.checked = true
}
})
this.checkBoxRouteUpdate()
this.setState({todos: newArray})
}
}

选中单个复选框

checkSingleCheckBox = (id) => {
let {todos} = this.state
let newArray = [...todos]
newArray.forEach(item => {
if (item._id === id) {
item.checked = !item.checked
axios
.put(`http://localhost:8080/edit/${id}`,{
checked:item.checked
})
.then(res => {
this.setState({todos: newArray})
console.log('res',res)
})
.catch((err) => {
console.log("err", err);
});
} else {
}
})
}

仅删除选中的项目

deleteAllChecked = () => {
const todos = this.state.todos.filter((item => item.checked !== true))
axios
.delete('http://localhost:8080/deleteAllChecked')
.then((res) => {
this.setState({ todos,
pageCount: Math.ceil(todos.length / 10)})
console.log("res", res);
})
.catch((err) => {
console.log("err", err);
});
}

Answer 1

您可以通过另一种方式选中/取消选中它们

this.checkBoxRouteUpdate()
this.setState(state => ({
...state,
todos: state.todos.map(todo => ({
...todo,
checked: !item.checked
}))
}))

我认为您应该在 api 返回正常状态后删除

.then((res) => {
this.setState(state => {
const todos = state.todos.filter((item => item.checked !== true));
return {
...state,
todos,
pageCount: Math.ceil(todos.length / 10)
}
})

Answer 2

我添加了很多评论，其中一些只是做你所做的事情的另一种方式，另一些是个人喜好，但最重要的是你可以看到做事:)的替代方法。

checkBoxRouteUpdate = () => {
const todos = [...this.state.todos]  // Better use const and initialize the array of objects directly
/*since you will use this array just in one place, is better if you iterate in 
the [...todos] directly without save it in a variable

let newArray = [...todos]  
*/
axios
.put(`http://localhost:8080/checkEdit/`, {
checked: todos.every(({checked}) => checked) // here you can use destructuring to get checked
}).then((res) => {
console.log("res", res);
})
.catch((err) => {
console.log("err", err);
});
}
```
checking all of them
```
checkAllCheckBox = () => {
const todos = [...this.state.todos]  // Better use const and initialize the array of objects directly
// let newArray = [...todos]  same as in the first function,
// isn't neccesary this if because if the array is empty, the map doesn't will iterate 
// if (newArray.length !==0) {
/* this is optional, but you can write this like
const modifiedTodos = [...todos].map(({checked}) => checked = !checked)
*/
/* In general, is better use const when possible because in this way 
you will reassign a variable just when is necessary, and this is related with
avoid mutate values. */
const modifiedTodos = todos.map(item => {
if (item.checked === true) {
return item.checked = false
} else {
return item.checked = true
}
})
this.checkBoxRouteUpdate()
this.setState({ todos: modifiedTodos })
}
// Checking single Check Box
checkSingleCheckBox = (id) => {
// since you need be secure that the todos is an array, you can do this instead of the destructuring
const todos = [...this.state.todos] 
// same as in the above function
// let newArray = [...todos]
// Here is better to use destructuring to get the _id and checked
[...todos].forEach(({checked, _id}) => {
/* this is totally personal preference but I try to avoid put a lot of code inside an if,
to do this, you can do something like:
if(_id !== id) return
and your code doesn't need to be inside the if
*/
if (_id === id) {
/* this mutation is a little difficult to follow in large codebase, so, 
is better if you modified the value in the place you will use it*/
// checked = !item.checked 
axios
.put(`http://localhost:8080/edit/${id}`, {
checked: !checked
})
.then(res => {
this.setState({ todos: todos }) // or just {todos} if you use the object shorthand notation
console.log('res', res)
})
.catch((err) => {
console.log("err", err);
});
}
// this else isn't necessary 
// else {
// }
})
}
// Deleting Only Checked Items
deleteAllChecked = () => {
const todos = this.state.todos.filter((item => item.checked !== true))
/* Another way to do the above filtering is:
const todos = this.state.todos.filter((item => !item.checked))
*/
axios
.delete('http://localhost:8080/deleteAllChecked')
.then((res) => {
this.setState({
todos,
pageCount: Math.ceil(todos.length / 10)
})
console.log("res", res);
})
.catch((err) => {
console.log("err", err);
});
}