React implements the method of highlighting the selected li when clicking on it

This article mainly introduces the example code of react to highlight the selected li. There are many li on the page. You need to highlight the one you click on. The content is quite good. I would like to share it with you now and give it as a reference.

Although it is just a simple function, it is better to record it. There are many li's on the page, and the one you click on will be highlighted. When I used jq back then, it was quite simple. I just added the selected element to addClass, then removed its sibling element, and then wrote an active style. Now to use react to implement similar operations, what I think of is to use a currentIndex and switch by judging which element the currentIndex is on.

Let’s take a look at the renderings first:

Code:

  class Category extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      currentIndex: 0
    }
    this.setCurrentIndex = this.setCurrentIndex.bind(this)
  }
  setCurrentIndex(event) {
    this.setState({
      currentIndex: parseInt(event.currentTarget.getAttribute('index'), 10)
    })
  }
  render() {
    let categoryArr = ['产品调整', '接口流量', '负载均衡', '第三方软件调整',
              '安全加固', '性能控制', '日志查询', '业务分析'];
    let itemList = [];
    for(let i = 0; i < categoryArr.length; i++) {
      itemList.push(<li key={i}
               className={this.state.currentIndex === i ? &#39;active&#39; : &#39;&#39;}
               index={i} onClick={this.setCurrentIndex}
             >{categoryArr[i]}</li>);
    }
    return <ul className="category">{itemList}</ul>
  }
}

css part

   .category {
      padding-left: 0;
      &:after {
        content: '';
        display: block;
        clear: both;
      }
      li {
        float: left;
        width: 23%;
        height: 40px;
        margin-right: 10px;
        margin-bottom: 10px;
        border: 1px solid $border-color;
        list-style: none;
        color: $font-color;
        line-height: 40px;
        text-align: center;
        font-size: 14px;
        cursor: pointer;
        &.active {
          border-color: #079ACD;
        }
     }

Isn’t it very simple. It is to add an index flag to the element when generating these li, and then when clicked, use event.currentTarget.getAttribute('index') to take out the index, then set the value of currentIndex, and then write css The active style is done.

The above is the entire content of this article. I hope it will be helpful to everyone's study. For more related content, please pay attention to the PHP Chinese website!

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