如何复选框添加到asp.net下拉 | 如何复选框添加到asp

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问题描述

I am doing databinding to a dropdown and I want to allow multiple selection using a check box in side the drop down. How can I do that. thanks

解决方案

public class CheckBoxDropDownList :
    System.Web.UI.WebControls.WebControl,INamingContainer
{
    protected override void CreateChildControls()
    {
        base.CreateChildControls ();
        DropDownList ddl=new DropDownList();
        ListItem li=new ListItem("");
        ddl.Items.Add(li);
        ddl.Width =new Unit(100);
        ddl.Attributes.Add("onmousedown", "showdiv()");
        ddl.Attributes.Add("onclick", "showdiv()");
        ddl.Attributes.Add("ondragover", "hidediv()");
        ddl.Attributes.Add("onmouseout", "hidediv()");

        CheckBoxList cbl=new CheckBoxList();
        cbl.Width=new Unit(80);

        ListItem li1=new ListItem("ListItem1");
        ListItem li2=new ListItem("ListItem2");
        ListItem li3=new ListItem("ListItem3");

        cbl.Items.Add(li1);
        cbl.Items.Add(li2);
        cbl.Items.Add(li3);

        System.Web.UI.HtmlControls.HtmlGenericControl div=new 
            System.Web.UI.HtmlControls.HtmlGenericControl("div");
        div.ID="serverdiv";
        div.Controls.Add(cbl);
        div.Style.Add("BORDER-RIGHT", "black 1px solid");
        div.Style.Add("BORDER-TOP", "black 1px solid");
        div.Style.Add("BORDER-LEFT", "black 1px solid");
        div.Style.Add("BORDER-BOTTOM", "black 1px solid");
        div.Style.Add("VISIBILITY", "hidden");

        this.Controls.Add(ddl);
        this.Controls.Add(div);
    }
}

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