key == 0?{ ...item,name: "Jony"}:item)});" method can modify a certain attribute value in the array object."/> key == 0?{ ...item,name: "Jony"}:item)});" method can modify a certain attribute value in the array object.">

Home  >  Article  >  Web Front-end  >  How to modify attribute values ​​in react

How to modify attribute values ​​in react

藏色散人
藏色散人Original
2022-12-29 09:23:452746browse

How to modify attribute values ​​in react: 1. Open the corresponding code file; 2. Create the array object; 3. Pass "this.setState({todoList: todoList.map((item,key)=> ;key == 0?{...item,name: "Jony"}:item)});" method can modify a certain attribute value in the array object.

How to modify attribute values ​​in react

The operating environment of this tutorial: Windows 10 system, react18.0.0 version, Dell G3 computer.

How to modify attribute values ​​in react?

React modifies a certain attribute value in the array object

Generally, we will process the data in the Controller and send it to the View. ) layer for display, this simple assignment method is as follows

this.setSate({ 
 toList: response.data 
})

The implementation of Vue is as follows

this.todoList = response.data;

For example, this is the data passed to us by the background,

We want to change How to implement the value of one of the `name` attributes of the array object?

 state = {//类似于Vue里面的data()
    todoList: [
      {
        img: "xxx",
        name: "小飞",
      },
      {
        img: "xxx",
        name: "小候",
      },
    ]
  };

Let’s first take a look at how to implement it in vue

this.todoList[0].name = "Jony";
//或者
this.$set(this.todoList[0],"name","Jony");

Wow~ It’s actually relatively simple, so how to implement it in React?

Imagination is like this...

 this.setState({
      todoList[0].name:"Jony"
    })
    //这样报错了,立马想到另一种方式
   let obj = {
      img:"xxx",
      name:"Jony"
    }
    this.setState({
      todoList[0]:obj
    })

It doesn’t work, our editor and browser are reporting errors, telling us that we can’t write like this

How to modify attribute values ​​in react

So how to implement it

//三目运算符 `key == 0` 是我写死的
//如果是点击传入的话可以是`key == index(下标)`
 const todoList = [...this.state.todoList];   //浅拷贝一下
  this.setState({
      todoList: todoList.map((item,key)=>key == 0?{...item,name: "Jony"}:item)
    });

This is the description of setState on the official website

How to modify attribute values ​​in react

Recommended learning: "react video Tutorial

The above is the detailed content of How to modify attribute values ​​in react. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn