如何隐藏和显示表单的字段 [英] how to hide and show fields of the form

问题描述

我有一个asp表单，其中我有几个控件，有一个下拉值，我想显示和隐藏以下字段基于从下拉列表中选择的值，问题是没有一个值对我想显示或隐藏字段，有两个以上的值asp代码是

i have a asp form ,in which i have few controls,there is a drop down value ,i want to show and hide followings fields base on the value selected from the drop down,problem is there is not one value against i want to show or hide the fields ,there are more then two values asp code is

<label class="col-sm-2 control-label">
               EmployeeStatus: <span class="symbol required"></span>
           </label>
           <div class="col-sm-3">
               <asp:DropDownList CssClass="form-control" ID="ddlEmpStatus" runat="server" OnSelectedIndexChanged="ddlEmpStatus_SelectedIndexChanged" AutoPostBack="true" />
               <asp:RegularExpressionValidator runat="server" ID="revddlEmpStatus" ControlToValidate="ddlEmpStatus" Required="required" Display="Dynamic"></asp:RegularExpressionValidator>
           </div>

后面的代码是

code behind is

protected void ddlEmpStatus_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (ddlEmpStatus.SelectedValue == "Absent")
            {
                ddlDutyType.Visible = false;
                ddlEmployeeShift.Visible = false;
                txtEndDate.Visible = false;
                txtHasWirles.Visible = false;

            }
            else 
            {
                txtStartDate.Visible = true;
                txtEndDate.Visible = true;
                ddlDutyType.Visible = true;
                ddlEmployeeShift.Visible = true;
            
            }

        }

i希望将这些字段展示给LEAVE，SHORTLEAVE，LONGLEAVE，并隐藏在Absent，SpecialDuty etc

i want show these field against LEAVE,SHORTLEAVE,LONGLEAVE,and hide upon Absent ,SpecialDuty etc

推荐答案

更改条件如下

change the condition as below

string[] visibleItems = new []{"LEAVE","SHORTLEAVE","LONGLEAVE"};

var selectedvalue =ddlEmpStatus.SelectedValue.ToUpper();
if(visibleItems.Contains(selectedvalue))
{
  //"show"
}else
{
   //"hide"
}

但是，除了硬编码隐藏和可见项目之外，您还可以在员工状态表中使用另一列来保留此隐藏/可见值。然后你可以将它的value属性和显示属性绑定到你想要显示的文本列。

But rather than hard code those hide and visible items you can have another column in employee status table to keep this hide/visible value. then you can bind the value property for that and display property to text column you want to display.

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