element/examples/docs/en-US/tree.md

<script>
  const data = [{
    label: 'Level one 1',
    children: [{
      label: 'Level two 1-1',
      children: [{
        label: 'Level three 1-1-1'
      }]
    }]
  }, {
    label: 'Level one 2',
    children: [{
      label: 'Level two 2-1',
      children: [{
        label: 'Level three 2-1-1'
      }]
    }, {
      label: 'Level two 2-2',
      children: [{
        label: 'Level three 2-2-1'
      }]
    }]
  }, {
    label: 'Level one 3',
    children: [{
      label: 'Level two 3-1',
      children: [{
        label: 'Level three 3-1-1'
      }]
    }, {
      label: 'Level two 3-2',
      children: [{
        label: 'Level three 3-2-1'
      }]
    }]
  }];

  const regions = [{
    'name': 'region1'
  }, {
    'name': 'region2'
  }];

  let count = 1;

  const props = {
    label: 'name',
    children: 'zones'
  };

  var defaultProps = {
    children: 'children',
    label: 'label'
  };

  export default {
    methods: {
      handleCheckChange(data, checked, indeterminate) {
        console.log(data, checked, indeterminate);
      },
      handleNodeClick(data) {
        console.log(data);
      },
      loadNode(node, resolve) {
        if (node.level === 0) {
          return resolve([{ name: 'Root1' }, { name: 'Root2' }]);
        }
        if (node.level > 3) return resolve([]);
        var hasChild;
        if (node.data.name === 'region1') {
          hasChild = true;
        } else if (node.data.name === 'region2') {
          hasChild = false;          
        } else {
          hasChild = Math.random() > 0.5;
        }
    
        setTimeout(function() {
          let data;
          if (hasChild) {
            data = [{
              name: 'zone' + count++
            }, {
              name: 'zone' + count++
            }];
          } else {
            data = [];
          }
    
          resolve(data);
        }, 500);
      }
    },
    
    data() {
      return {
        data,
        regions,
        defaultProps,
        props
      };
    }
  };
</script>

## Tree 

Display a set of data with hierarchies.

### Basic usage

Basic tree structure.

::: demo
```html
<el-tree :data="data" :props="defaultProps" @node-click="handleNodeClick"></el-tree>

<script>
  export default {
    data() {
      return {
        data: [{
          label: 'Level one 1',
          children: [{
            label: 'Level two 1-1',
            children: [{
              label: 'Level three 1-1-1'
            }]
          }]
        }, {
          label: 'Level one 2',
          children: [{
            label: 'Level two 2-1',
            children: [{
              label: 'Level three 2-1-1'
            }]
          }, {
            label: 'Level two 2-2',
            children: [{
              label: 'Level three 2-2-1'
            }]
          }]
        }, {
          label: 'Level one 3',
          children: [{
            label: 'Level two 3-1',
            children: [{
              label: 'Level three 3-1-1'
            }]
          }, {
            label: 'Level two 3-2',
            children: [{
              label: 'Level three 3-2-1'
            }]
          }]
        }],
        defaultProps: {
          children: 'children',
          label: 'label'
        }
      };
    },
    methods: {
      handleNodeClick(data) {
        console.log(data);
      }
    }
  };
</script>
```
:::

### Selectable

Used for node selection. In the following example, data for each layer is acquired after being clicked. If there is no child data, the expanding icon will disappear.

::: demo
```html
<el-tree
  :data="regions"
  :props="props"
  :load="loadNode"
  lazy
  show-checkbox
  @check-change="handleCheckChange">
</el-tree>

<script>
  export default {
    data() {
      return {
        regions: [{
          'name': 'region1'
        }, {
          'name': 'region2'
        }],
        props: {
          label: 'name',
          children: 'zones'
        },
        count: 1
      };
    },
    methods: {
      handleCheckChange(data, checked, indeterminate) {
        console.log(data, checked, indeterminate);
      },
      handleNodeClick(data) {
        console.log(data);
      },
      loadNode(node, resolve) {
        if (node.level === 0) {
          return resolve([{ name: 'Root1' }, { name: 'Root2' }]);
        }
        if (node.level > 3) return resolve([]);

        var hasChild;
        if (node.data.name === 'region1') {
          hasChild = true;
        } else if (node.data.name === 'region2') {
          hasChild = false;
        } else {
          hasChild = Math.random() > 0.5;
        }

        setTimeout(() => {
          var data;
          if (hasChild) {
            data = [{
              name: 'zone' + this.count++
            }, {
              name: 'zone' + this.count++
            }];
          } else {
            data = [];
          }

          resolve(data);
        }, 500);
      }
    }
  };
</script>
```
:::

### Accordion

Only one node among the same level can be expanded at one time.

::: demo
```html
<el-tree :data="data" :props="defaultProps" accordion @node-click="handleNodeClick"></el-tree>

<script>
  export default {
    data() {
      return {
        data: [{
          label: 'Level one 1',
          children: [{
            label: 'Level two 1-1',
            children: [{
              label: 'Level three 1-1-1'
            }]
          }]
        }, {
          label: 'Level one 2',
          children: [{
            label: 'Level two 2-1',
            children: [{
              label: 'Level three 2-1-1'
            }]
          }, {
            label: 'Level two 2-2',
            children: [{
              label: 'Level three 2-2-1'
            }]
          }]
        }, {
          label: 'Level one 3',
          children: [{
            label: 'Level two 3-1',
            children: [{
              label: 'Level three 3-1-1'
            }]
          }, {
            label: 'Level two 3-2',
            children: [{
              label: 'Level three 3-2-1'
            }]
          }]
        }],
        defaultProps: {
          children: 'children',
          label: 'label'
        }
      };
    },
    methods: {
      handleNodeClick(data) {
        console.log(data);
      }
    }
  };
</script>
```
:::

### Attributes
| Attribute             | Description                              | Type                        | Accepted Values | Default |
| --------------------- | ---------------------------------------- | --------------------------- | --------------- | ------- |
| data                  | tree data                                | array                       | —               | —       |
| empty-text            | text displayed when data is void         | string                      | —               | —       |
| node-key              | unique identity key name for nodes, its value should be unique across the whole tree | string                      | —               | —       |
| props                 | configuration options, see the following table | object                      | —               | —       |
| load                  | method for loading subtree data          | function(node, resolve)     | —               | —       |
| render-content        | render function for tree node            | Function(h, { node }        | —               | —       |
| highlight-current     | whether current node is highlighted      | boolean                     | —               | false   |
| current-node-key      | key of current node, a set only prop     | string, number              | —               | —       |
| default-expand-all    | whether to expand all nodes by default   | boolean                     | —               | false   |
| expand-on-click-node  | whether to expand or collapse node when clicking on the node, if false, then expand or collapse node only when clicking on the arrow icon. | —                           | true            |         |
| auto-expand-parent    | whether to expand father node when a child node is expanded | boolean                     | —               | true    |
| default-expanded-keys | array of keys of initially expanded nodes | array                       | —               | —       |
| show-checkbox         | whether node is selectable               | boolean                     | —               | false   |
| check-strictly        | whether checked state of a node not affects its father and child nodes when `show-checkbox` is `true` | boolean                     | —               | false   |
| default-checked-keys  | array of keys of initially checked nodes | array                       | —               | —       |
| filter-node-method    | this function will be executed on each node when use filter method. if return `false`, tree node will be hidden. | Function(value, data, node) | —               | —       |
| accordion             | whether only one node among the same level can be expanded at one time | boolean                     | —               | false   |

### props
| Attribute | Description                              | Type   | Accepted Values | Default |
| --------- | ---------------------------------------- | ------ | --------------- | ------- |
| label     | specify which key of node object is used as the node's label | string | —               | —       |
| children  | specify which key of node object is used as the node's subtree | string | —               | —       |

### Method
`Tree` has the following method, which returns the currently selected array of nodes.
| Method          | Description                              | Parameters                               |
| --------------- | ---------------------------------------- | ---------------------------------------- |
| filter          | filter all tree nodes, filtered nodes will be hidden | Accept a parameter which will be used as first parameter for filter-node-method |
| getCheckedNodes | If the node can be selected (`show-checkbox` is `true`), it returns the currently selected array of nodes | Accept a boolean type parameter whose default value is `false`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. |
| setCheckedNodes | set certain nodes to be checked, only works when `node-key` is assigned | an array of nodes to be checked          |
| getCheckedKeys  | If the node can be selected (`show-checkbox` is `true`), it returns the currently selected array of node's keys | (leafOnly) Accept a boolean type parameter whose default value is `true`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. |
| setCheckedKeys  | set certain nodes to be checked, only works when `node-key` is assigned | (keys, leafOnly) Accept two parameters: 1. an array of node's keys to be checked 2. a boolean type parameter whose default value is `true`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. |
| setChecked      | set node to be checked or not, only works when `node-key` is assigned | (key/data, checked, deep) Accept three parameters: 1. node's key or data to be checked 2. a boolean typed parameter indicating checked or not. 3. a boolean typed parameter indicating deep or not. |

### Events
| Event Name     | Description                              | Parameters                               |
| -------------- | ---------------------------------------- | ---------------------------------------- |
| node-click     | triggers when a node is clicked          | three parameters: node object corresponding to the node clicked, `node` property of TreeNode, TreeNode itself |
| check-change   | triggers when the selected state of the node changes | three parameters: node object corresponding to the node whose selected state is changed, whether the node is selected, whether node's subtree has selected nodes |
| current-change | triggers when current node changes       | two parameters: node object corresponding to the current node, `node` property of TreeNode |
| node-open      | triggers when current node open          | three parameters: node object corresponding to the node opened, `node` property of TreeNode, TreeNode itself |
| node-close     | triggers when current node close         | three parameters: node object corresponding to the node closed, `node` property of TreeNode, TreeNode itself |