达到最大长度时如何自动更改文本框的焦点 [英] how to automatically change focus of text box when reach to max length

问题描述

private void txtcnic1_TextChanged(object sender, EventArgs e)
       {
           if (txtcnic1.MaxLength == 5)
               txtcnic2.Focus();
       }

推荐答案

尝试类似的方法:

Try something like this:

if(txtcnic1.Text.Length == txtcnic1.MaxLength) {
   txtcnic2.Focus();
}

或者更通用一些，因此您可以将事件处理程序用于多个文本框:

Or somewhat more generic, so you can use the event handler for more than one textbox:

TextBox txtBox = (TextBox)this.ActiveControl;
if (txtBox.TextLength == txtBox.MaxLength) 
{
  this.SelectNextControl(this.ActiveControl, true, true, false, false);
}

祝你好运！

Good luck!

如下更新代码.

Hi,

Update your code as below.

private void txtcnic1_TextChanged(object sender, EventArgs e)
{
  if (txtcnic1.MaxLength == txtcnic1.Text.Length)
      txtcnic2.Focus();
}

然后在您的aspx页面中.

And in your aspx page.

<asp:textbox id="txtcnic1" runat="server" ontextchanged="txtcnic1_TextChanged" AutoPostBack="true"></asp:textbox>

请确保已将AutoPostBack属性设置为true.

Please make sure you have set AutoPostBack property to true.

嗨
试试这个

Hi
Try this

private void textBox1_TextChanged(object sender, EventArgs e)
     {
         if(textBox1.TextLength.Equals(textBox1.MaxLength))
             textBox2.Focus();
     }

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