【sgTree】自定义组件：加载el-tree树节点整棵树数据，实现增删改操作。

特性?

1. 可以自定义主键、配置选项
2. 支持预定义节点图标：folder文件夹|normal普通样式
3. 多个提示文本可以自定义
4. 支持动态接口增删改节点
5. 可以自定义根节点id
6. 可以设置最多允许添加的层级深度
7. 支持拖拽排序，排序过程还可以针对拖拽的节点深度进行自定义限制
8. 支持隐藏一级节点（根节点）复选框?
9. 支持屏蔽一级节点（根节点）勾选?

sgTree源码?

<template>
  <div :class="$options.name">
    <div class="tree-header" v-if="!(readonly || readonly === '')">
      <div class="sg-left">
        <template v-if="uploadData">
          <el-tooltip
            popper-class="sg-el-tooltip"
            :enterable="false"
            effect="dark"
            :content="`支持拖拽到树上传文件`"
            placement="top-start"
          >
            <el-button
              type="text"
              icon="el-icon-upload"
              size="mini"
              @click="(d) => $refs.sgUpload.triggerUploadFile()"
            >
              批量导入
            </el-button>
          </el-tooltip>
          <el-button type="text" icon="el-icon-download" size="mini" @click="downloadTpl">
            下载模板
          </el-button>
        </template>
      </div>
      <div class="sg-right">
        <el-button type="text" size="mini" @click.stop="addRoot"
          >{{ (data.text || {}).addRootButtonText || `添加根节点`
          }}<i class="el-icon-circle-plus-outline"></i
        ></el-button>
      </div>
    </div>
    <div class="tree-container">
      <el-tree
        :class="
          hideRootNodeCheckbox === '' || hideRootNodeCheckbox
            ? 'hideRootNodeCheckbox'
            : ''
        "
        ref="tree"
        :data="treeData"
        :node-key="mainKey"
        :props="
          data.props || {
            label: 'label', //指定节点标签为节点对象的某个属性值
            children: 'children', //指定子树为节点对象的某个属性值
            disabled: 'leaf', //指定节点选择框是否禁用为节点对象的某个属性值
            isLeaf: 'leaf', //指定节点是否为叶子节点，仅在指定了 lazy 属性的情况下生效
          }
        "
        :icon-class="`${data.iconType}-tree-node`"
        :indent="data.indent || 10"
        @current-change="current_change"
        @node-click="nodeClick"
        highlight-current
        @node-drag-start="nodeDragStart"
        @node-drag-enter="nodeDragEnter"
        @node-drag-leave="nodeDragLeave"
        @node-drag-over="nodeDragOver"
        @node-drag-end="nodeDragEnd"
        @node-drop="nodeDrop"
        :draggable="draggable === '' || draggable"
        :allow-drop="allowDrop"
        :allow-drag="allowDrag"
        :show-checkbox="showCheckbox"
        :default-checked-keys="defaultCheckedKeys"
        @check-change="handleCheckChange"
      >
        <el-popover
          popper-class="tree-el-popover"
          placement="right"
          trigger="hover"
          title=""
          content=""
          :disabled="readonly || readonly === ''"
          slot-scope="{ node, data }"
        >
          <span class="right">
            <el-button
              title="添加"
              type="text"
              size=""
              icon="el-icon-circle-plus-outline"
              @click.stop="addNode(node, data)"
              v-if="showAddButton(node)"
              >添加</el-button
            >
            <el-button
              title="删除"
              type="text"
              size=""
              icon="el-icon-remove-outline"
              @click.stop="remove(node, data)"
              >删除</el-button
            >
          </span>
          <div slot="reference" class="node-label">
            <div class="left" :title="node.label">
              {{ node.label }}
            </div>
          </div>
        </el-popover>
      </el-tree>

      <!-- 上传组件 -->
      <sgUpload
        :disabledWhenShowSels="['.v-modal']"
        :drag="uploadData ? dragUpload : false"
        ref="sgUpload"
        :data="uploadData"
        @uploadSuccess="uploadSuccess"
        @uploadError="uploadError"
        @importError="importError"
        @showLoading="showLoading"
        @hideLoading="hideLoading"
        hideUploadTray
      />
    </div>
  </div>
</template>

<script>
import sgUpload from "@/vue/components/admin/sgUpload";
export default {
  name: "sgTree",
  components: {
    sgUpload,
  },
  data() {
    return {
      // 动态树：增删改_________________________________________________________
      rootNode: null, //根节点
      rootResolve: null, //根节点
      focusNodeId: null, //聚焦高亮新添加ID
      mainKey: "id", //默认主键
      defaultRootId: "root", //默认根节点ID就是root
      maxAddLevel: null, // 最多允许添加的层级
      dragUpload: true, //在拖拽节点过程中控制上传组件能否拖拽上传
      // _________________________________________________________
    };
  },
  props: [
    "treeData",
    "data",
    "readonly",
    "draggable", //是否开启拖拽节点功能
    "uploadData",
    /* 例子 uploadData: {
            accept: '.xls,.xlsx',
            actionUrl: `${this.$d.API_ROOT_URL}/core/resource/upload`,
        }, */
    "allowNodeDrag",
    "allowNodeDrop",
    "showCheckbox", //节点是否可被选择
    "hideRootNodeCheckbox", //隐藏一级节点复选框?
    "disabledRootNode", //屏蔽一级节点勾选?
    "defaultCheckedKeys", //默认勾选的节点的 key 的数组
  ],

  watch: {
    data: {
      /* 
      data.iconType= 节点图标：
      folder  文件夹
      normal  普通样式
      plus    加减符号样式
      */
      handler(d) {
        d.nodeKey && (this.mainKey = d.nodeKey); //主键
        d.rootId && (this.defaultRootId = d.rootId); //根节点ID
        d.maxAddLevel && (this.maxAddLevel = d.maxAddLevel); // 最多允许添加的层级
      },
      deep: true,
      immediate: true,
    },
  },
  methods: {
    showLoading(file) {
      this.$emit(`showLoading`, file);
    },
    hideLoading(file) {
      this.$emit(`hideLoading`, file);
    },
    // 取消选中
    unCheckAll(d) {
      this.$refs.tree.setCheckedKeys([]);
      this.handleCheckChange([], []);
    },
    handleCheckChange(data, checked, indeterminate) {
      this.$emit(`checkChange`, {
        checkedNodes: this.$refs.tree.getCheckedNodes(),
        checkedLeafOnlyNodes: this.$refs.tree.getCheckedNodes(true, false), //(leafOnly, includeHalfChecked) 接收两个 boolean 类型的参数，1. 是否只是叶子节点，默认值为 false 2. 是否包含半选节点，默认值为 false【注意：懒加载树形不管用！必须要明确叶子节点展开后面没有子节点了才能识别！】
        data,
        checked,
        indeterminate,
      });
    },
    // 拖拽----------------------------------------
    nodeDragStart(node, ev) {
      this.dragUpload = false;
      this.$emit(`nodeDragStart`, node, ev);
    },
    nodeDragEnter(draggingNode, dropNode, ev) {
      this.$emit(`nodeDragEnter`, draggingNode, dropNode, ev);
    },
    nodeDragLeave(draggingNode, dropNode, ev) {
      this.$emit(`nodeDragLeave`, draggingNode, dropNode, ev);
    },
    nodeDragOver(draggingNode, dropNode, ev) {
      this.$emit(`nodeDragOver`, draggingNode, dropNode, ev);
    },
    nodeDragEnd(draggingNode, dropNode, dropType, ev) {
      // dropType有'before'、'after'、'inner'和'none'4种情况
      this.dragUpload = true;
      this.$emit(`nodeDragEnd`, draggingNode, dropNode, dropType, ev);
    },
    nodeDrop(draggingNode, dropNode, dropType, ev) {
      // dropType有'before'、'after'、'inner'和'none'4种情况
      this.$emit(`nodeDrop`, draggingNode, dropNode, dropType, ev);
    },
    allowDrop(draggingNode, dropNode, dropType) {
      // 拖拽时判定目标节点能否被放置。dropType 参数有三种情况：'prev'、'inner' 和 'next'，分别表示放置在目标节点前、插入至目标节点和放置在目标节点后（注意：很奇葩上面node开头的绑定方法dropType有before、after、inner和none4种情况）
      return this.allowNodeDrop
        ? this.allowNodeDrop(draggingNode, dropNode, dropType)
        : true;
    },
    allowDrag(draggingNode) {
      return this.allowNodeDrag ? this.allowNodeDrag(draggingNode) : true;
    },
    // ----------------------------------------
    showAddButton(node) {
      if (this.maxAddLevel) {
        return node.level < this.maxAddLevel; // 最多允许添加的层级
      } else return true;
    },
    downloadTpl(d) {
      this.$emit(`downloadTpl`);
    },
    uploadSuccess(d, f) {
      this.$emit(`uploadSuccess`, d, f);
    },
    uploadError(d, f) {
      this.$emit(`uploadError`, d, f);
    },
    importError(d, f) {
      this.$emit(`importError`, d, f);
    },
    // 聚焦到某一个节点
    focusNode(id) {
      if (!id) return;
      this.$nextTick(() => {
        this.$refs.tree.setCurrentKey(id); //高亮显示某个节点
        this.$emit(`currentChange`, this.$refs.tree.getCurrentNode());
        this.$nextTick(() => {
          let dom = document.querySelector(`.el-tree-node.is-current`);
          dom &&
            dom.scrollIntoView({
              behavior: "smooth",
              block: "nearest",
              inline: "nearest",
            }); //缓慢滚动
        });
      });
    },
    // 添加根节点
    addRoot() {
      this.addNode(this.$refs.tree.root, { [this.mainKey]: this.defaultRootId });
    },
    // 通过id展开指定节点（通常是用于外部调用）
    expandNodeById(id) {
      let node = this.$refs.tree.getNode(id);
      node.expand();
    },
    //通过id勾选节点
    setCheckedKeys(ids) {
      this.$refs.tree.setCheckedKeys(ids);
    },
    // 添加节点
    addNode(node, data) {
      let resolve = (d) => {
        if (data.ID === this.defaultRootId) {
          this.treeData.unshift(d);
        } else {
          data.children || this.$set(data, "children", []);
          data.children.push(d);
        }
        node.expand();
      };
      let reject = (d) => {
        this.rootLoading = false;
        node.loading = false;
        this.$message.error(d.msg); //添加节点失败
      };
      this.$emit(`addNode`, { node, data, resolve, reject });
    },
    // 删除节点
    remove(node, data) {
      this.$confirm(
        (this.data.text || {}).removeConfirmTip ||
          `此操作将永久删除该节点及其下面的节点，是否继续？`,
        (this.data.text || {}).removeConfirmTitle || `提示`,
        {
          dangerouslyUseHTMLString: true,
          confirmButtonText: `确定`,
          cancelButtonText: `取消`,
          type: "warning",
        }
      )
        .then(() => {
          this.removeNodeData(node, data);
        })
        .catch(() => {});
    },
    // 删除节点数据（通过接口向后台删除数据）
    removeNodeData(node, data) {
      node.loading = true; //出现加载动画
      let resolve = (d) => {
        node.loading = false;
        this.$message.success(`删除成功`);

        // 从父节点异步删除子节点
        const parent = node.parent;
        const children = parent.data.children || parent.data;
        const index = children.findIndex((d) => d[this.mainKey] === data[this.mainKey]);
        children.splice(index, 1);

        // 从显示界面删除节点（有bug，只是删除了树节点的Virtual DOM，实际数据还在）
        /* let childNodes = node.parent.childNodes; childNodes.splice( childNodes.findIndex((d) => d.data[this.mainKey] === data[this.mainKey]), 1 ); */
      };
      let reject = (d) => {
        this.rootLoading = false;
        node.loading = false;
        this.$message.error(d.msg); //删除失败
      };
      this.$emit(`removeNode`, { node, data, resolve, reject });
    },
    // 当前选中节点变化时触发的事件
    current_change(d) {
      this.$emit(`currentChange`, d);
    },
    //点击节点
    nodeClick(d) {
      this.focusNodeId = null;
      this.$emit(`nodeClick`, d);
    },
  },
};
</script>

<style lang="scss" scoped>
@import "~@/css/sg";

.sgTree {
  $treeHeaderHeight: 30px;
  width: 100%;
  height: 100%;
  display: flex;
  flex-wrap: nowrap;
  flex-direction: column;
  white-space: nowrap;
  flex-shrink: 0;
  flex-grow: 1;
  position: relative;

  .tree-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: $treeHeaderHeight;

    & > .sg-left {
    }

    & > .sg-right {
    }
  }

  .tree-container {
    position: relative;
    overflow: auto;
    box-sizing: border-box;
    height: calc(100% - #{$treeHeaderHeight});
    flex-shrink: 0;
    flex-grow: 1;
    user-select: none;
    @include scrollbarHover();
    /* >>> .tree-container .el-tree .el-tree-node__content {
      cursor: pointer;
    } */
    >>> .el-tree--highlight-current .el-tree-node.is-current > .el-tree-node__content {
      background-color: #409eff22; // 高亮当前选中节点背景
    }

    >>> .el-tree {
      * {
        transition: none;
      }

      .el-tree-node__children {
        min-width: max-content; //这样才会出现水平滚动条
      }

      .normal-tree-node,
      .plus-tree-node,
      .folder-tree-node {
        & + label:not(.el-checkbox) {
          /*单行省略号*/
          overflow: hidden;
          white-space: nowrap;
          text-overflow: ellipsis;
        }

        flex-shrink: 0;
        display: block;
        padding: 0 !important;
        margin: 0;
        width: 20px;
        height: 20px;
        margin-right: 5px;
        background: transparent url("~@/../static/img/fileType/folder/folder.svg")
          no-repeat center / contain;

        margin-left: 20px;

        & ~ span:not(.el-icon-loading) {
          width: 100%;

          .node-label {
            height: 40px;
            display: flex;
            align-items: center;
          }
        }

        &.expanded {
          flex-shrink: 0;
          transform: rotate(0deg);
          background-image: url("~@/../static/img/fileType/folder/folder-open.svg");
        }
        &.is-leaf {
          background-image: none;
        }
      }

      .normal-tree-node {
        margin-left: 10px;
        background-image: url("~@/../static/img/fileType/folder/arrow-right.svg");

        &.expanded {
          transform: rotate(90deg);
          background-image: url("~@/../static/img/fileType/folder/arrow-right.svg");
        }

        &.is-leaf {
          background-image: none;
        }
      }
      .plus-tree-node {
        margin-left: 10px;
        background-image: url("~@/../static/img/fileType/folder/plus.svg");

        &.expanded {
          background-image: url("~@/../static/img/fileType/folder/minus.svg");
        }
        &.is-leaf {
          background-image: none;
        }
      }

      // 隐藏一级节点的复选框
      &.hideRootNodeCheckbox > div > .el-tree-node__content .el-checkbox {
        display: none;
      }
    }
  }
}

.tree-el-popover {
  .el-button {
    padding-top: 0;
    padding-bottom: 0;
  }
}
</style>

?应用

<template>
  <div :class="$options.name">
    <sgTree
      v-loading="loading"
      :key="$route.query.BMID + sgTree_fresh"
      :treeData="treeData"
      :data="treeConfigData"
      @currentChange="currentChange"
      @addNode="addNode"
      @removeNode="removeNode"
      :uploadData="{
        name: `file`,
        accept: '.xls,.xlsx',
        actionUrl: `${$d.API_ROOT_URL}/core/column/importColumn`, //批量导入树结构接口
        actionData: {
          BMID: $global.getBMID(),
          PID: `root`,
          sgLog: `强哥请求来源：${$options.name}导入栏目xls`,
        },
      }"
      @uploadSuccess="uploadSuccess"
      @uploadError="uploadError"
      @importError="importError"
      @downloadTpl="downloadTpl"
      draggable
      :allowNodeDrop="allowNodeDrop"
      @nodeDragEnd="nodeDragEnd"
    />
  </div>
</template>

<script>
import sgTree from "@/vue/components/admin/sgTree";
export default {
  name: "sgBody",
  components: {
    sgTree,
  },
  data() {
    return {
      sgTree_fresh: false,
      autoId: 0, //自增编号
      treeConfigData: {
        nodeKey: `ID`, //主键
        props: { label: "MC", isLeaf: "leaf" }, //配置选项
        iconType: "plus", //节点图标：folder文件夹|normal普通样式|plus加减符号样式
        text: {
          addRootButtonText: "添加根目录", //添加根节点按钮文本
          removeConfirmTitle: "警告！！！", //删除节点提示标题
          removeConfirmTip: "此操作将永久删除该节点及其下面的子节点，是否继续？", //删除节点提示内容
        },
      },
      treeData: [],
      loading: false,
    };
  },
  created() {
    this.initTreeData();
  },
  methods: {
    //初始化数据
    initTreeData({ d } = {}) {
      this.$global.获取整棵树的数据({
        cb: (d) => {
          this.treeData = d;
        },
      });
    },
    // 拖拽节点相关方法----------------------------------------
    allowNodeDrop(draggingNode, dropNode, dropType) {
      // 只允许拖拽同级别前后排序
      let isPrevOrNext = dropType === "prev" || dropType === "next";
      // 同在第一级根节点下
      let isSameRootLevel =
        draggingNode.level === dropNode.level && draggingNode.level === 1;
      // 同在一个节点（非根节点）下
      let isSameChildLevel =
        draggingNode.parent &&
        dropNode.parent &&
        draggingNode.parent.data &&
        dropNode.parent.data &&
        draggingNode.parent.data.ID === dropNode.parent.data.ID;
      return isPrevOrNext && (isSameRootLevel || isSameChildLevel);
    },
    nodeDragEnd(draggingNode, dropNode, dropType, ev) {
      // 只允许拖拽同级别前后排序
      let isBeforeOrAfter = dropType === "before" || dropType === "after";
      if (isBeforeOrAfter) {
        /* console.log("被拖拽的节点", draggingNode.data.MC, draggingNode.data.PXZ); console.log("停靠的节点", dropNode.data.MC, dropNode.data.PXZ); */
        let theSameLevelDatas = (dropNode.parent.childNodes || []).map((v) => v.data); // 获取同一级节点数据
        theSameLevelDatas.forEach((v, i) => (v.PXZ = i)); //重新排序
        // console.log("拖拽排序", theSameLevelDatas); //这里需要调用后台接口
        let IDS = theSameLevelDatas.map((v) => v.ID); //排序后的ID顺序数组
        let data = {
          IDS,
          sgLog: `强哥请求来源：${this.$options.name}更改同一层级树节点排序值`,
        };
        this.$d.修改节点排序({
          data,
          r: {
            s: (d) => {
              // console.log("【成功】", d);
            },
          },
        });
      }
    },
    // ----------------------------------------
    // 获取当前聚焦节点的数据
    currentChange(d) {
      console.log(``, d);
    },
    // 添加节点
    addNode({ data, resolve }) {
      this.$d.新增节点({
        data: {
          MC: `新增节点名称(${++this.autoId})`,
        },
        doing: {
          l: { show: () => (this.loading = true), close: () => (this.loading = false) },
          s: (d) => resolve(d),
          f: (d) => reject(d), //删除失败
        },
      });
    },
    // 删除节点
    removeNode({ node, data, resolve, reject }) {
      this.$d.删除节点({
        data: { ID: data.ID },
        doing: {
          s: (d) => resolve(d),
          f: (d) => reject(d), //删除失败
        },
      });
    },
    updateList(d) {},
    uploadSuccess(d, f) {
      this.sgTree_fresh = !this.sgTree_fresh;
    },
    uploadError(d, f) {
      this.$message.error(d.msg);
    },
    // 导入失败
    importError(d, f) {},
    // 下载导入模板
    downloadTpl(d) {},
  },
};
</script>

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