Asp.net中的CheckBox控件（c＃）

Question

Code:

   <asp:CheckBox ID="CheckBox1" runat="server" 
    oncheckedchanged="CheckBox1_CheckedChanged" />

c#

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{

}

I added checkbox to my form.

When Checkbox checked, some information(TextBox, Label etc.) should be appear right under the checkbox.

How can i do this?

Answer 1

Don't forget autopostback = true

<asp:CheckBox ID="CheckBox1" runat="server" oncheckedchanged="CheckBox1_CheckedChanged" AutoPostBack="true" />
<asp:Panel runat="server" ID="panel1"></asp:Panel>

-

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
    panel1.Controls.Add(new Label { Text = "Text goes here" });
}

This allows you to add any control you want.

Answer 2

Just add TextBox, Label etc. controls and make them invisible. Then in the CheckBox1_CheckedChanged function make them visible. This is done by setting the bool Visible property

<asp:CheckBox ID="CheckBox1" runat="server" oncheckedchanged="CheckBox1_CheckedChanged" />
<asp:TextBox ID="textBox" runat="server" Visible=false />

and

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
    textBox.Visible = true;
}

Answer 3

Add a new literal control under your checkbox tags,

<asp:Literal id="lblMsg" runat="server"/>

then in your CheckBox1_CheckedChanged event to this:

lblMsg.Text = "Checked";

and yes set the AutoPostBack property of your checkbox to true

Answer 4

I would suggest doing this using javascript. Your users won't have to "postback" and the feeling on the application will be better, and you will reduce the server charge.

Using jQuery, you can use something like this:

<script language="javascript" type="text/javascript">
 $(document).ready(function(){
      $("#chk").onclick(function() {
          $("#content").toggle();
      });
  });
</script>
<input type="Checkbox" id="chk"/>
<div id="content" style="display:none">
       <asp:TextBox runat="Server" id="oneOfYourControls" />
</div>

jQuery is not mandatory... you can use standard simple getElementById() .

The only drawback, is that you cannot dynamically build the content, but in most case it's a not actually a matter

Answer 5

In Checked Changed Event write your code like this:

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
     Label1.Text = "Text";
}