Vue中实现动态右键菜单的示例代码

<template>
  <div v-if="visible">
    <a-menu class="contextmenu" :style="style" @click="handleClick">
      <a-menu-item v-for="item in list" :key="item.key">
        <span>{{ item.text }}</span>
      </a-menu-item>
    </a-menu>
  </div>
</template>

<script>
export default {
  name: "ContextMenu",
  props: {
    visible: {
      type: Boolean,
      default: false,
    },
    list: {
      type: Array,
      required: true,
      default: () => [],
    },
  },
  data() {
    return {
      left: 0,
      top: 0,
      target: null,
    };
  },
  computed: {
    style() {
      return {
        left: this.left + "px",
        top: this.top + "px",
      };
    },
  },
  created() {
    const clickHandler = () => this.closeMenu();
    const contextMenuHandler = (e) => {
      e.preventDefault();
      this.setPosition(e);
    };
    window.addEventListener("click", clickHandler);
    window.addEventListener("contextmenu", contextMenuHandler);
    this.$emit("hook:beforeDestroy", () => {
      window.removeEventListener("click", clickHandler);
      window.removeEventListener("contextmenu", contextMenuHandler);
    });
  },
  methods: {
    closeMenu() {
      this.$emit("update:visible", false);
    },
    setPosition(e) {
      // 获取菜单的宽高
      const menu = document.querySelector(".contextmenu");
      const menuHeight = menu.offsetHeight;
      // 获取窗口的可视高度
      const windowHeight = window.innerHeight;

      this.left = e.clientX;

      // 计算菜单的上边位置
      if (e.clientY + menuHeight > windowHeight) {
        const top = e.clientY - menuHeight;
        if (top < 0) {
          this.top = 0; // 确保菜单不会超出顶部
        } else {
          // 如果菜单的底部超出了窗口的底部
          this.top = top;
        }
      } else {
        // 如果菜单的底部没有超出窗口的底部
        this.top = e.clientY;
      }

      this.target = e.target;
    },
    handleClick({ key }) {
      const _component = this.list.filter((item) => item.key === key)[0]
        .component;
      if (_component) {
        this.$emit("contextMenuClick", _component, key);
      }
      this.closeMenu();
    },
  },
};
</script>

setPosition(e) {
  // 获取菜单的宽高
  const menu = document.querySelector(".contextmenu");
  const menuHeight = menu.offsetHeight;
  // 获取窗口的可视高度
  const windowHeight = window.innerHeight;

  this.left = e.clientX;

  // 计算菜单的上边位置
  if (e.clientY + menuHeight > windowHeight) {
    const top = e.clientY - menuHeight;
    if (top < 0) {
      this.top = 0; // 确保菜单不会超出顶部
    } else {
      // 如果菜单的底部超出了窗口的底部
      this.top = top;
    }
  } else {
    // 如果菜单的底部没有超出窗口的底部
    this.top = e.clientY;
  }

  this.target = e.target;
}

created() {
  const clickHandler = () => this.closeMenu();
  const contextMenuHandler = (e) => {
    this.setPosition(e);
  };
  window.addEventListener("click", clickHandler);
  window.addEventListener("contextmenu", contextMenuHandler);
  this.$emit("hook:beforeDestroy", () => {
    window.removeEventListener("click", clickHandler);
    window.removeEventListener("contextmenu", contextMenuHandler);
  });
}

<style lang="scss" scoped>
.contextmenu {
  position: fixed;
  z-index: 1000;
  border-radius: 4px;
  border: 1px lightgrey solid;
  box-shadow: 4px 4px 10px lightgrey !important;
}
</style>