控件显示问题

Question

怎样在客户端完DropdownList选择0的时候之显示TextBox，选择1的时候之显示TextBox1

Answer 1

<select onchange="FF3(this);"><option selected>请选择</option>
<option value="0">0</option>
<option value="1">1</option></select>
<input  type="text"  id="txt0" style="DISPLAY:none"/>
<input  type="text"  id="txt1" style="DISPLAY:none"/>function FF3(c) {                 document.getElementById('txt0').style.display = 'none';
                 document.getElementById('txt1').style.display = 'none';
                 if (c.value == '0') {
                     document.getElementById('txt0').style.display = '';
                 }
                 if (c.value =='1') {
                     document.getElementById('txt1').style.display = '';
                 }
             }

Answer 2

protected void ddlPost_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (ddlPost.SelectedValue==0)
            {
                TextBox1.Visible = true;
            }
            if (ddlPost.SelectedValue==1)
            {
                TextBox2.Visible = true;
            }
        }

Answer 3

设置DropdownList1的AutoPostBack=trueprivate void DropdownList1_SelectedIndexChanged(object sender, System.EventArgs e) 
{ 
if(DropdownList1.SelectedItem.Value == "0")
{
TextBox.Visible = true;
TextBox1.Visible = false;
}
else if(DropdownList1.SelectedItem.Value == "1")
{
TextBox.Visible = false;
TextBox1.Visible = true;
}
}