Question

我试图从不同的文本框中添加不同的数字，一旦将值输入到每个文本框中，总和值将显示在显示总值的标签中。例如。 textbox1 + textbox 2要在label1中显示的值。在C＃中。请问我该如何解决这个问题？感谢

Answer 1

这是一个使用两个文本框的非常简单的方法。假设您已正确连接事件处理程序，这应该适合您。肯定有更优雅的方法，但这应该让你开始。

private void textBox1_TextChanged(object sender, TextChangedEventArgs e)
{
    SumAndDisplay();
}

private void textBox2_TextChanged(object sender, TextChangedEventArgs e)
{
    SumAndDisplay();
}

private void SumAndDisplay()
{
    int a;
    int b;
    if (Int32.TryParse(textBox1.Text, out a) && Int32.TryParse(textBox2.Text, out b))
    {
        label1.Content = (a + b).ToString();
    }
}

Answer 2

你去..请检查。请注意，您还可以使用jQuery进行dom元素访问过程。

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="JavaScript.aspx.cs" Inherits="WebTest.JavaScript" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>

    <script language="javascript" type="text/javascript">

        function CalculateTotal() {
            var total = 0;

            for (var e = 0; e < form1.elements.length; e++) {
                var el = form1.elements[e];
                if (el.type == 'text') {
                    if (el.value != "")
                        total += parseInt(el.value);
                }
            }

            document.getElementById("lb").innerText = "Total is: " + total;
        }

        function ValidChar(e, objSrc, validchars) {
            var key, keychar;
            key = window.event.keyCode;
            if (key == null) return true;

            keychar = String.fromCharCode(key);
            keychar = keychar.toLowerCase();
            validchars = validchars.toLowerCase();

            if (validchars.indexOf(keychar) != -1)
                return true;

            if (key == null || key == 0 || key == 8 || key == 9 || key == 13 || key == 27)
                return true;

            return false;
        }

    </script>

</head>
<body>
    <form id="form1" runat="server">
    <table border="0" cellpadding="0" cellspacing="0">
        <tr>
            <td>
                <asp:TextBox ID="txt01" runat="server" onfocusout="CalculateTotal();" onkeypress="return ValidChar(event,this,'0123456789')"></asp:TextBox>
            </td>
        </tr>
         <tr>
            <td>
                <asp:TextBox ID="txt02" runat="server" onfocusout="CalculateTotal();" onkeypress="return ValidChar(event,this,'0123456789')"></asp:TextBox>
            </td>
        </tr>
         <tr>
            <td>
                <asp:TextBox ID="txt03" runat="server" onfocusout="CalculateTotal();" onkeypress="return ValidChar(event,this,'0123456789')"></asp:TextBox>
            </td>
        </tr>
         <tr>
            <td>
                <asp:TextBox ID="txt04" runat="server" onfocusout="CalculateTotal();" onkeypress="return ValidChar(event,this,'0123456789')"></asp:TextBox>
            </td>
        </tr>
         <tr>
            <td>
                <asp:Label ID="lb" runat="server"></asp:Label>
            </td>
        </tr>
    </table>
    </form>
</body>
</html>

如何在各种文本框中添加数字以及标签中显示的总和

2 个答案: