如何隐藏或单击编辑按钮时，基于另外两个文本框的条件禁用单选按钮列表和文本框 [英] How to hide or disable radiobuttonlist and textbox based on condition of another two textboxes when edit button is clicked

问题描述

我有顺序文本框和单选按钮列表和编辑按钮，一个FormView如下：

I have a formview with textboxes and radiobuttonlist and edit button in the order as follows

 <asp:textbox id="tb1" runat="server" text='<%# Bind("DATE_1", "{0:d}") %>' />
 <asp:calendarextender id="tb1_CalendarExtender" runat="server" targetcontrolid="tb1" />

 <asp:textbox id="tb2" runat="server" text='<%# Bind("DATE_2", "{0:d}") %>' />
 <asp:calendarextender id="tb2_CalendarExtender" runat="server" targetcontrolid="tb2" />

 <asp:button id="EditButton" runat="server" causesvalidation="False" commandname="Edit" text="Edit" enabled='<%# CanEdit(Eval("DATE_1"), Eval("DATE_2")) %>' OnClick="EditButton_Click" />

 <asp:radiobuttonlist id="rbl1" runat="server" repeatdirection="Horizontal" text='<%# Bind("DIAG_LL_APPROVAL") %>'>
      <asp:ListItem>Approved</asp:ListItem>
      <asp:ListItem>Rejected</asp:ListItem>
      <asp:ListItem Selected="True">None</asp:ListItem>
 </asp:radiobuttonlist>
 <asp:textbox id="tb3" runat="server" text='<%# Bind("COMMENTS") %>' maxlength="1000"/>                                 

需要隐藏或关闭 RBL1 和 TB3 如果 TB1 或 TB2 没有任何价值（即空）当编辑按钮被点击。

Need to hide or disable rbl1 and tb3 if tb1 or tb2 doesn't have any value (i.e null) when edit button is clicked.

protected void EditButton_Click(object sender, EventArgs e)
    {
        TextBox t1 = FormViewName.FindControl("tb1") as TextBox;
        TextBox t2 = FormViewName.FindControl("tb2") as TextBox;
        RadioButtonList rbl = FormViewName.FindControl("rbl1") as RadioButtonList;
        TextBox t3 = FormViewName.FindControl("tb3") as TextBox;

        //if ("".Equals(tdcd) || "".Equals(tdrcd))
        if (!string.IsNullOrEmpty(t1.Text) && !string.IsNullOrEmpty(t2.Text))
        {
            FormViewName.FindControl("rbl1").Visible = true;
            FormViewName.FindControl("tb3").Visible = true;
        }
        else
        {
            FormViewName.FindControl("rbl1").Visible = false;
            FormViewName.FindControl("tb3").Visible = false;
        }
    }                                                                             

错误：Oject引用不设置到对象的实例

Error: Oject reference not set to an instance of an object

推荐答案

试试这个：
在编辑按钮点击事件：

Try this one: On Edit button click event:

if (string.IsNullOrEmpty(tb1.Text) && string.IsNullOrEmpty(tb2.Text))
        {
            rbl1.Visible = false;
            tb3.Visible = false;
        }

修改

TextBox txt = (TextBox)FormView1.FindControl("tb1");

TextBox txt1 = (TextBox)FormView1.FindControl("tb2");

TextBox tb3= (TextBox)FormView1.FindControl("tb3");

 RadioButtonList rb1= (RadioButtonList)FormView1.FindControl("rbl1");


    if (string.IsNullOrEmpty(txt.Text) && string.IsNullOrEmpty(txt1.Text))
            {
                rb1.Visible = false;
                tb3.Visible = false;
            }
          else

              {
                rb1.Visible = true;
                tb3.Visible = true;
}

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