滚动条不占位置-CSDN博客

以Vue + Element Dialog为例用ResizeObserver监听容器高度变化当高度大于最大高度出现滚动条右边距减去滚动条的宽度反之恢复正常边距

<el-dialog>
  <div class="dialog_body" v-fix-scroll-bar="this">
    <slot />
  </div>
</el-dialog>

export default {
  data() {
    return {
      resizeObserver: null,
    }
  },

  methods: {
    setScrollBar() {
      this.resizeObserver = new ResizeObserver((entries) => {
        for (let entry of entries) {
          const cr = entry.contentRect;

          const el_dialog_body = entry.target.parentNode;
          const maxHeight = window.getComputedStyle(el_dialog_body).maxHeight;

          if (maxHeight && cr.height > parseInt(maxHeight)) {
            el_dialog_body.style.paddingRight = "20px";
          } else {
            el_dialog_body.style.paddingRight = "32px";
          }
        }
      });
    },
  },

  mounted() {
    this.setScrollBar();
  },

  directives: {
    fixScrollBar: {
      inserted: (el, binding) => {
        const _this = binding.value;
        _this.resizeObserver.observe(el);
      },
      unbind: (el, binding) => {
        const _this = binding.value;
        _this.resizeObserver.unobserve(el);
      },
    },
  },
}