react实现通讯录效果

业务描述：通过react实现一个类似通讯录的页面，并可以通过点击侧边首字母跳转到对应的用户
效果展示
因为是移动端，请按F12切换成移动端
效果展示
大致效果

步骤
1，先造一批假数据

 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生成用户列表页面
1先准备左右两个dom容器，分别用于承载用户列表和首字母列表

  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通过数据分别生成用户列表和首字母列表放入上一步生成的容器中

     //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 点击首字母滚动到对应用户
注意我们在第二步生成画面的时候，重要的一步：将首字母页面的id作为字母列表的值

<div className={universal.rowCenter+" "+jsPage.chatSpan}  key={number.id} id={number.name}>1

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

这样通过点击首字母时就可以把对应首字母页面的id传到方法里，然后通过h5的scrollIntoView方法跳转到对应的锚点，

   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();
    }

这样就可以啦

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