vue实现下拉框点击其他区域关闭

1.实现效果

下拉框-vue.gif

2.实现原理

• mounted：初始化页面完成后，再对html的dom节点进行一些需要的操作组件
• 添加点击事件监听document.addEventListener，假设点击区域不再该区域上，关闭弹框

3.实现代码

<template>
  <div>
    <div>
      <div class="flex-row">
        <div
          class="hd_sel flex-row j_b"
          @click="show_month = !show_month"
          ref="s1"
        >
          <div>{{ current_month }}</div>
          <div
            class="arrow"
            :class="{ top: show_month, bot: !show_month }"
          ></div>
        </div>
      </div>
      <div class="hd_e">
        <div v-show="show_month" class="drop_hd">
          <div
            class="drop_hd_item"
            v-for="(item, index) in month_list"
            :class="{ drop_hd_ative: current_month == item.name }"
            :key="index"
            @click="choseItem(item, index)"
          >
            {{ item.name }}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import DropSelet from "./components/dropSelet.vue";
export default {
  name: "dropItem",
  components: {
    DropSelet,
  },

  data() {
    return {
      current_month: "All",
      show_month: false,
      month_list: [
        {
          name: "All",
        },
        {
          name: "2022-1",
        },
        {
          name: "2022-2",
        },
      ],
    };
  },
  mounted() {
    document.addEventListener(
      "click",
      (e) => {
        let s1 = this.$refs.s1;
        if (!s1.contains(e.target)) {
          this.show_month = false;
        }
      },
      true
    );
  },
  methods: {
    choseItem(e) {
      this.current_month = e.name;
      this.show_month = false;
    },
  },
};
</script>

<style lang="less" scoped>
.drop_hd_ative {
  background-color: pink;
  color: #fff !important;
}

.drop_hd_item {
  line-height: 30px;
  color: #333;
}

.drop_hd {
  position: absolute;
  width: 200px;
  min-height: 30px;
  box-sizing: border-box;
  padding: 10px;
  background: #fff;
  left: 0;
  top: 3px;
  border-radius: 5px;
  z-index: 99;
  box-shadow: 5px 5px 5px #ccc;
  cursor: pointer;
}

.hd_e {
  position: relative;
}
.hd_sel {
  margin-top: 50px;
  min-width: 200px;
  height: 32px;
  background: rgba(243, 243, 243);
  border-radius: 8px;
  box-sizing: border-box;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 500;
  position: relative;
  cursor: pointer;
}
.arrow {
  border-width: 6px;
  border-bottom: 0;
  border-color: #fff transparent transparent transparent;
  border-style: solid;
  width: 0;
  height: 0;
  transition: transform 0.3s;
  margin-left: 10px;
  &.bot {
    transform: rotate(0deg);
  }
  &.top {
    transform: rotate(-180deg);
  }
}
</style>

 document.addEventListener(
  "click",
   (e) => {
     if (!this.$el.contains(e.target)) {
       this.show = false;
     }
   },
   true
 );
 或者
document.addEventListener(
 "click",
  (e) => {
    let s1 = this.$refs.s1;
    if (!s1.contains(e.target)) {
      this.show_month = false;
    }
  },
  true
);

4.完整代码，关注公众号 苏苏的bug，更多vue相关，尽在苏苏的码云如果对你有帮助，欢迎你的star+订阅！