How to implement address book in react

React method to implement address book: 1. Create a batch of address book data; 2. Prepare two DOM containers on the left and right to carry the user list and initials list respectively; 3. Generate the user list and initials List; 4. Use the id of the first letter page as the value of the letter list; 5. Pass the id of the corresponding first letter page to the method, and then jump to the corresponding anchor point through the scrollIntoView method of h5.

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

How to implement address book in react?

react to achieve address book effect

Business description: Use react to implement a page similar to an address book, and you can jump to it by clicking the first letter on the side Corresponding user

Approximate effect

Step

1, first create a batch of fake data

 const users = [
                [
                {id: 0,  name:"a",imgUrl:white},
                {id: 1,  name:'ahat',imgUrl:sysImg4},
                {id: 2,  name:'aocial',imgUrl:sysImg4},
                {id: 3,  name:'aircle',imgUrl:sysImg4},
              ],
                [
                    {id: 4,  name:"b",imgUrl:white},
                    {id: 5,  name:'bhat',imgUrl:sysImg4},
                    {id: 6,  name:'bocial',imgUrl:sysImg4},
                    {id: 7,  name:'bircle',imgUrl:sysImg4},
                ]
            ,
            [
                {id: 8,  name:"c",imgUrl:white},
                {id: 9,  name:'chat',imgUrl:sysImg4},
                {id: 10,  name:'cocial',imgUrl:sysImg4},
                {id: 11,  name:'circle',imgUrl:sysImg4},
            ]
            ,
            [
                {id: 12,  name:"d",imgUrl:white},
                {id: 13,  name:'dhat',imgUrl:sysImg4},
                {id: 14,  name:'docial',imgUrl:sysImg4},
                {id: 15,  name:'dircle',imgUrl:sysImg4},
            ]
            ,
            [
                {id: 16,  name:"e",imgUrl:white},
                {id: 17,  name:'ehat',imgUrl:sysImg4},
                {id: 18,  name:'eocial',imgUrl:sysImg4},
                {id: 19,  name:'eircle',imgUrl:sysImg4},
            ]
        ];

2 generate User list page

1 First prepare two DOM containers on the left and right, which are used to host the user list and initial letter list respectively

return (
        <div className={this.props.chatShow
                         }>
            <div className={jsPage.chatRight}>
              <div className={jsPage.pointListStyle} id="points">
                  {pointLists}
              </div>
              </div>
            <div className={jsPage.chatLeft+" "+universal.columnStartCenter}>
                {userLists}
            </div>
        </div>
        )

css

.chatRight{
    height: 100%;width: 3%;
    position:fixed;right: 0;
}
.chatLeft{
    height: 100%;width: 95%;
}

2 Generate user lists through data and the list of initials into the container generated in the previous step

     //用户列表
        var userLists=new Array();
        //侧栏首字母列表
        var pointLists=new Array();
        //遍历
        for(var i=0;i<users.length;i++){
            //得到每个首字母对应的用户
            var user=users[i];
            //map遍历生成用户信息
            const userList=user.map(
                (number)=>
                    <div className={universal.rowCenter+" "+jsPage.chatSpan}  key={number.id} id={number.name}>
                        <img src={number.imgUrl} className={jsPage.imgStyle2}
                        ></img>
                        <div className={jsPage.chatUserInfo+" "+universal.rowStart}>
                            <div className={jsPage.chatUserInfoSpan+" "+
                            universal.rowCenter+" "+
                            jsPage.fontStyle1}>{number.name}</div>
                            <div className={jsPage.chatUserInfoSpan}></div>
                        </div>
                    </div>
                    )
            //将用户信息放入用户列表
            userLists.push(userList);
            //生成首字母信息
            const point=<div
                            onClick={msg=>this.scrollToAnchor(msg)}
                            className={jsPage.pointStyle}
                             key={user[0].name}
                             >{user[0].name}
                             </div>
            //将首字母信息放入首字母列表
            pointLists.push(point);
        }

3 Click the initial letter to scroll to the corresponding user

Note that when we generate the screen in the second step, the important step is: add the first letter The id of the letter page is used as the value of the letter list

<div className={universal.rowCenter+" "+jsPage.chatSpan}  key={number.id} id={number.name}>

<div
                            onClick={msg=>this.scrollToAnchor(msg)}
                            className={jsPage.pointStyle}
                             key={user[0].name}
                             >{user[0].name}
                             </div>

In this way, when the first letter is clicked, the id of the corresponding first letter page can be passed to the method, and then the scrollIntoView method of h5 is used to jump to the corresponding anchor point.

   scrollToAnchor  (e)  {
            // 找到锚点
            var anchorElement = document.getElementById(e.target.innerHTML);
            // 如果对应id的锚点存在，就跳转到锚点
           anchorElement.scrollIntoView();
    }

That’s it

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