Textbox，TextChanged事件未触发 [英] Textbox,TextChanged event not firing

问题描述

请帮我这个，我有3个文本框，即txtLastname，txtFirstname和txtUsername我希望我的txtUsername在提供txtLastname和txtFirstname的数据后自动填充，格式应为txtLastname_txtFirstname（txtFirstname中的前两个字母），这里是我正在使用的代码：



aspx：

 <   asp：TextBox     ID   =  txtUsername    runat   =  server   宽度  =  250px  
   
                           ontextchanged   =  txtUsername_TextChanged    AutoPostBack   =  true >  <   / asp：TextBox  >  

cs文件：



< pre lang =cs> protected void txtUsername_TextChanged（ object sender，EventArgs e）
{
txtUsername.Text = txtLastName.Text + _ + txtFirstName.Text;
}

解决方案

它应如下所示：

< asp：textbox id =   txtFirstname runat =   server >  < /   asp：textbox  >  
 
< asp： textbox id =   txtLastname runat =   server autopostback =   true ontextchanged =   txtLastname_TextChanged >  < span class =code-keyword>< /   asp：textbox  >  
 
< asp：textbox id =   txtUsername  runat =   server width =    250px >  < /   asp：textbox  >  

  protected   void  txtLastname_TextChanged（ object  sender，EventArgs e）
 {
 txtUsername.Text = txtLastName.Text +   _ + txtFirstName.Text; 
} 

问候..：）

如果您希望在更改值时自动更改用户名的文本框对于 txtLastname，txtFirstname 而不是txtUsername，应为txtLastname，txtFirstname创建 ontextchanged 事件。



见下面代码：



ASPX代码：

 <   asp：TextBox     ID   =  txtLastname    runat   = 服务器   宽度  =  250px  
   
                           ontextchanged   =  txtName_TextChanged    AutoPostBack   =  true >  <   / asp：TextBox  >  
 
 <   asp：TextBox     ID   =  txtFirstname     runat   =  server   宽度  =  250px < span class =code-attribute> 
   
    < span class =code-attribute>                       ontextchanged   =  txtName_TextChanged    AutoPostBack   =  true >  <   / asp：TextBox  >  
 
 <   asp：TextBox     ID   =  txtUsername < span class =code-attribute>   runat   =  server   宽度  =   250px  
   
                           AutoPostBack   =  true >  <   / asp：TextBox  >  

CS代码：

  protected   void  txtName_TextChanged（ object  sender，EventArgs e）
 {
  this  .txtUsername.Text =  this  .txtLastname.Text +   _ + 此 .txtFirstname.Text; 
} 

试试这个：

将你的逻辑放在firstname和lastname文本框文本上。

Please help me with this, I have 3 textboxes namely txtLastname,txtFirstname and txtUsername I want my txtUsername to automatically be filled after supplying data for txtLastname and txtFirstname the format should be txtLastname_txtFirstname(The first two letters in txtFirstname), here's the code I'm using:

aspx:

<asp:TextBox ID="txtUsername" runat="server" Width="250px"

            ontextchanged="txtUsername_TextChanged" AutoPostBack="true"></asp:TextBox>

cs file:

protected void txtUsername_TextChanged(object sender, EventArgs e)
    {
        txtUsername.Text = txtLastName.Text + "_" + txtFirstName.Text;
    }

解决方案

It should be like follows:

<asp:textbox id="txtFirstname" runat="server" ></asp:textbox>

<asp:textbox id="txtLastname" runat="server" autopostback="true" ontextchanged="txtLastname_TextChanged" ></asp:textbox>

<asp:textbox id="txtUsername" runat="server" width="250px" ></asp:textbox>

protected void txtLastname_TextChanged(object sender, EventArgs e)
{
     txtUsername.Text = txtLastName.Text + "_" + txtFirstName.Text;
}

Regards..:)

If you want textbox for username to be changed automatically on changing the value of the txtLastname, txtFirstname than you should create ontextchanged event for txtLastname, txtFirstname instead of txtUsername.

See below code :

ASPX Code :

<asp:TextBox ID="txtLastname" runat="server" Width="250px"

            ontextchanged="txtName_TextChanged" AutoPostBack="true"></asp:TextBox>

    <asp:TextBox ID="txtFirstname" runat="server" Width="250px"

            ontextchanged="txtName_TextChanged" AutoPostBack="true"></asp:TextBox>

    <asp:TextBox ID="txtUsername" runat="server" Width="250px"

            AutoPostBack="true"></asp:TextBox>

CS Code :

protected void txtName_TextChanged(object sender, EventArgs e)
        {
            this.txtUsername.Text = this.txtLastname.Text + "_" + this.txtFirstname.Text;
        }

Try this :
put your logic on firstname and lastname textbox text changed.

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