FineUI模拟树下拉列表

模拟树的下拉列表

很多时候，我们希望在下拉列表中显示简单树状的层次结构，在菜单设置、机构设置等场景下这个需求尤为突出。也是基于项目需求的考虑，FineUI增加了模拟树的下拉列表的功能，显示效果如下所示：

注意，这里不仅包含了树状的层次结构，而且包含了可选择项和不可选择项。下面就来看看如何实现这个示例：

   1:  <ext:DropDownList Label="DropDownList" AutoPostBack="false" Required="true" EnableSimulateTree="true"

   2:          ShowRedStar="true" runat="server" ID="ddlBox">

   3:  </ext:DropDownList>

   1:  public class JQueryFeature

   2:  {

   3:      private string _id;

   4:      public string Id

   5:      {

   6:          get { return _id; }

   7:          set { _id = value; }

   8:      }

   9:      

  10:      private string _name;

  11:      public string Name

  12:      {

  13:          get { return _name; }

  14:          set { _name = value; }

  15:      }

  16:   

  17:      private int _level;

  18:      public int Level

  19:      {

  20:          get { return _level; }

  21:          set { _level = value; }

  22:      }

  23:   

  24:      private bool _enableSelect;

  25:      public bool EnableSelect

  26:      {

  27:          get { return _enableSelect; }

  28:          set { _enableSelect = value; }

  29:      }

  30:   

  31:      public JQueryFeature(string id, string name, int level, bool enableSelect)

  32:      {

  33:          _id = id;

  34:          _name = name;

  35:          _level = level;

  36:          _enableSelect = enableSelect;

  37:      }

  38:  }

  39:   

  40:  protected void Page_Load(object sender, EventArgs e)

  41:  {

  42:      if (!IsPostBack)

  43:      {

  44:          List<JQueryFeature> myList = new List<JQueryFeature>();

  45:          myList.Add(new JQueryFeature("0", "jQuery", 0, false));

  46:          myList.Add(new JQueryFeature("1", "核心", 1, false));

  47:          myList.Add(new JQueryFeature("2", "选择符", 1, false));

  48:          myList.Add(new JQueryFeature("3", "基本选择符", 2, true));

  49:          myList.Add(new JQueryFeature("4", "内容选择符", 2, true));

  50:          myList.Add(new JQueryFeature("5", "属性选择符", 2, true));

  51:          myList.Add(new JQueryFeature("6", "筛选", 1, false));

  52:          myList.Add(new JQueryFeature("7", "过滤", 2, true));

  53:          myList.Add(new JQueryFeature("8", "查找", 2, true));

  54:          myList.Add(new JQueryFeature("9", "事件", 1, false));

  55:          myList.Add(new JQueryFeature("10", "页面载入", 2, true));

  56:          myList.Add(new JQueryFeature("11", "事件处理", 2, true));

  57:          myList.Add(new JQueryFeature("12", "事件委托", 2, true));

  58:   

  59:          ddlBox.DataTextField = "Name";

  60:          ddlBox.DataValueField = "Id";

  61:          ddlBox.DataSimulateTreeLevelField = "Level";

  62:          ddlBox.DataEnableSelectField = "EnableSelect";

  63:          ddlBox.DataSource = myList;

  64:          ddlBox.DataBind();

  65:   

  66:          ddlBox.SelectedValue = "3";

  67:      }

  68:  }

除了正常数据绑定中常见的DataTextField、DataValueField、DataSource、DataEnableSelectField属性外，还多了另外一个属性：

1. DataSimulateTreeLevelField：模拟树显示时指示所在层次的数据字段。

开发人员只需要简单地多计算一个字段，剩下页面上的渲染工作就全部交给FineUI完成了，是不是很方便。