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如数据结构中的父子关系是通过 ID 和 ParentID 建立的,且存在一个根节点。就可以考虑使用树形列表控件的第一种构建方式,两个字段递归。
例如:
从图中我们可以看出,第一列为“ID”,第二列为“父ID”,并且存在一个根节点,也即图中的1001,它的父ID为空。
满足如示例中条件的数据即可使用两个字段递归的方式构建树形列表。
构建完成后的树形列表效果图如下:
单值效果:
多值效果:
接下来我们来看具体的构建步骤。
1. 首先我们创建树形字典数据集,如 select * from treeview1。
为了制作树形列表需要专门添加一个数据集,该数据集中包含了树形需要的数据结构。
注意
使用此种构建方式时,如使用Excel数据源,请注意在创建数据源时勾选转化空单元格为DBNull,这样控件构建树时才可以识别到根节点。
2. 添加报表参数,指定可用数据。
可用数据中的数据集就用我们专门创建的用于构建树形的数据集,数据字段我们选择最终需要返回的叶子节点,即“ID”;标签字段即显示到树形结构中的字段,我们选择“组织名称”,这样才会在树形列表中显示实际的名称而非ID号。
3. 进入查询面板设计界面,单击树形列表控件添加控件。
4. 绑定参数。
5. 选择构建方式。根据数据构成选择对应的构建方式,由于我们的字典数据集满足两个字段递归方式,所以这里选择两个字段递归。
6. 绑定字段,构建树形列表。
单击添加按钮添加空白字段并绑定树形所需的字段。自上而下,先绑定父节点,然后依次绑定子节点和叶子节点。
此时预览可见,树形列表核心已经构建成功。后续您还可以根据实际需要进行其他细节属性调整。
7. 其他属性设置。
接下来您可以在属性设置中进行其他的细节调整。
比如可以将呈现方式改为列表模式,并开启多选模式。
type=info
提示
使用列表模式显示时,为了显示较多的选项,此时需要手动将控件拉大。同时需要面板布局为控件预留足够的位置。
预览后,可见树形下拉列表以列表模式呈现,无需单击下拉按钮即可选择并且可以选择多个参数值。
属性大类 | 属性名 | 说明 |
---|---|---|
-- | 绑定 | 用于为控件绑定参数,选择重置即解绑定。 |
-- | 显示方式 | 用于设置控件的显示方式为下拉选择,还是直接选择。 默认为下拉框模式,需点击下拉按钮展开选项。 如选择列表模式,则无需下拉直接选择。但要控件位置足够大,才方便选择。需要设计时手动将控件拉大。 |
常规设置 | 构建方式 | 选择树形列表控件的核心构建方式。 根据不同的数据结构选择合适的构建方式。 |
绑定字段 | 绑定构建树形的字段,构建树形结构。 如需绑定多个字段,则必须自上而下依次绑定。 | |
标签 | 标题文本/显示位置 | 请参见控件通用属性。 |
绑定参数 | 默认值 | 设定控件默认值。 如果设定了默认值,首次预览报表则不需要用户选择,自动将默认值填充。 |
多选 | 选择“ 是 ”则表示下拉框为多选下拉框。 选择“ 否 ”则表示下拉框为单选下拉框。 | |
允许空白值 | 是否允许控件值为空白值。 | |
允许为空值 | 设置控件值是否为必输项。 | |
位置&大小 | 左、上、宽度、高度 | 请参见控件通用属性。 |