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       
(Showing Draft Content)

单字段自动构建

功能概述

还有一种情况,有时数据结构中的父子关系是在同一个字段中的,依据不同的位数来表示该数据所在的父子层级。

此时就可以使用树形列表控件的第三种构建方式,单字段自动构建。

例如:

image2020-5-26_12-21-59.png

从图中我们可以看出,数据结构中用三位数字表示一层。101表示树结构的第一层,101101为该节点的子节点,也即树的第二层;101101101为第三层,101101101101为第四层。

此时我们就可以使用单字段自动构建的方式来构建树形列表。

构建完成后的树形列表效果图如下:

单值效果:

image2020-5-26_11-1-53.png

多值效果:

image2020-5-26_11-2-24.png

接下来我们来看具体的构建步骤。

构建步骤

1. 首先我们创建树形字典数据集,如 select * from treeview3。

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。

2. 添加报表参数,指定可用数据。

可用数据中的数据集使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,这里即“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”。

image

3. 进入查询面板设计界面,单击树形列表控件添加控件。

image


4. 绑定参数。

image2020-5-25_17-57-23.png


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单字段自动构建的要求,所以这里选择单字段自动构建

image2021-11-23_11-13-22.png


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。此种构建方式,绑定ID字段即可。

image2021-11-23_11-13-42.png


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。

image2020-5-26_13-53-50.png


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。

image

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,无需下拉即可选择并且可以选择多个参数值。

image2020-5-26_14-5-16.png

属性介绍

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

选择则表示下拉框为多选下拉框。

选择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