Let’s talk about how to implement province and city shuttle boxes in Ant Design Vue

This article will take you through how to use Ant Design Vue to implement provincial and city shuttle boxes. I hope it will be helpful to you!

Tree shuttle box

The official tree shuttle box is as follows, with the tree structure on the left and the list on the right.

Essentially, there are two sets of data sources. tree uses a tree data source, and transfer uses a list data source to convert multi-dimensional tree data The source is converted to one-dimensional, which is list data.

For specific usage, you can view the official documentation of the shuttle box with search box (https://antdv.com/components/transfer-cn/)

City shuttle box

Reasons for transforming the shuttle box:

• targetKeysOnly city data is required, not province data

• In the source shuttle box, the child node and the parent node have no associated selection relationship and need to be processed. After all, the provincial and municipal levels need to be linked.

• The target shuttle box must also be supported. Tree structure

Main implementation function points:

• Tree structure data processing: keyword filtering; selected data disabled state;

• Realize the association between parent node and node selection

• On the right side of the shuttle box, only city data is displayed, and province data is not displayed

• Selected city data: returned with provincial information, meeting the interface requirements, that is, returning a tree structure

The essence of the transformation: based on The second transformation of transfer is mainly about data processing. The components are basically unchanged.

Component parameters and events

Custom parameters: consider the parameters exposed to the outside world. The role of parameters, attributes, etc. Custom events: Consider exposed callback events

// 自定义参数
export default {
  props: {
    dataSource: {
      // 数据源
      type: Array,
      default: () => [],
    },
    targetKey: {
      // 右侧框数据的 key 集合
      type: Array,
      default: () => [],
    },
  },
};

// handleChange回调函数：treeData-左侧树结构数据，toArray-右侧树结构数据，targetKeys-选中城市key集合
this.$emit("handleChange", this.treeData, toArray, this.targetKeys);

Shuttle box processing

Data source processing

• Shuttle box Data processing (transferDataSource): Convert multi-dimensional data to one-dimensional data

• Tree data processing (treeData): Data source filtering processing, data prohibition operation processing

// 数据源示例
const dataSource = [
  {
    pid: "0",
    key: "1000",
    label: "黑龙江省",
    title: "黑龙江省",
    children: [
      {
        pid: "1000",
        key: "1028",
        label: "大兴安岭地区",
        title: "大兴安岭地区",
      },
    ],
  },
];

// ant-transfer穿梭框数据源
transferDataSource() {
  // 穿梭框数据源
  let transferDataSource = [];
  // 穿梭框数据转换，多维转为一维
  function flatten(list = []) {
    list.forEach((item) => {
      transferDataSource.push(item);
      // 子数据处理
      if (item.children && item.children.length) {
        flatten(item.children);
      }
    });
  }
  if (this.dataSource && this.dataSource.length) {
    flatten(JSON.parse(JSON.stringify(this.dataSource)));
  }
  return transferDataSource;
}

// ant-tree树数据源
treeData() {
  // 树形控件数据源
  const validate = (node, map) => {
    // 数据过滤处理 includes
    return node.title.includes(this.keyword);
  };
  const result = filterTree(
    this.dataSource,
    this.targetKeys,
    validate,
    this.keyword
  );
  return result;
}

// 树形结构数据过滤
const filterTree = (tree = [], targetKeys = [], validate = () => {}) => {
  if (!tree.length) {
    return [];
  }
  const result = [];
  for (let item of tree) {
    if (item.children && item.children.length) {
      let node = {
        ...item,
        children: [],
        disabled: targetKeys.includes(item.key), // 禁用属性
      };
      // 子级处理
      for (let o of item.children) {
        if (!validate.apply(null, [o, targetKeys])) continue;
        node.children.push({ ...o, disabled: targetKeys.includes(o.key) });
      }
      if (node.children.length) {
        result.push(node);
      }
    }
  }
  return result;
};

Shuttle box event processing

• change event, callback data (handleTransferChange)

• search search event ( handleTransferSearch)

// 穿梭框：change事件
handleTransferChange(targetKeys, direction, moveKeys) {
  // 过滤：避免头部操作栏“全选”将省级key选中至右边
  this.targetKeys = targetKeys.filter((o) => !this.pidKeys.includes(o));
  // 选中城市数据：带省级信息返回，满足接口要求
  const validate = (node, map) => {
    return map.includes(node.key) && node.title.includes(this.keyword);
  };
  let toArray = filterTree(this.dataSource, this.targetKeys, validate);
  // handleChange回调函数：treeData-左侧树结构数据，toArray-右侧树结构数据，targetKeys-选中城市key集合
  this.$emit("handleChange", this.treeData, toArray, this.targetKeys);
},

// 穿梭框：搜索事件
handleTransferSearch(dir, value) {
  if (dir === "left") {
    this.keyword = value;
  }
},

Tree event

• change event, handles the linkage relationship between parent node and child node (handleTreeChecked)

• expand event: tree expansion and contraction (handleTreeExpanded)

// 树形控件：change事件
handleTreeChecked(keys, e, checkedKeys, itemSelect, itemSelectAll) {
  const {
    eventKey,
    checked,
    dataRef: { children },
  } = e.node;
  if (this.pidKeys && this.pidKeys.includes(eventKey)) {
    // 父节点选中：将所有子节点也选中
    let childKeys = children ? children.map((item) => item.key) : [];
    if (childKeys.length) itemSelectAll(childKeys, !checked);
  }
  itemSelect(eventKey, !isChecked(checkedKeys, eventKey)); // 子节点选中
},
// 树形控件：expand事件
handleTreeExpanded(expandedKeys) {
  this.expandedKeys = expandedKeys;
},

Clear event

Re When opening, you need to restore the component state, such as the scroll bar position, search box keywords, etc.

handleReset() {
  this.keyword = "";
  this.$nextTick(() => {
    // 搜索框关键字清除
    const ele = this.$refs.singleTreeTransfer.$el.getElementsByClassName(
      "anticon-close-circle"
    );
    if (ele && ele.length) {
      ele[0] && ele[0].click();
      ele[1] && ele[1].click();
    }
    // 滚动条回到顶部
    if (this.$el.querySelector(".mcd-tree")) {
      this.$el.querySelector(".mcd-tree").scrollTop = 0;
    }
    // 展开数据还原
    this.expandedKeys = [];
  });
}

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