我昨晚问了这个问题,但写得不是很好,所以我要再问一遍.我正在使用ASP.NET和c#创建一个简单的计算器作为我的代码.我目前正在尝试测试并确保我的代码背后是用户输入的文本框中输入的值.我输入一个if语句,如果它传递给它的字符串为空,则为文本框分配值mehhh.我的文本框显示mehhh所以我知道它是一个空字符串,但我不知道为什么？这里是该网站的链接... http://scort323.csweb.kutztown.edu/Calc.aspx 下面是我的页面部分代码的代码:
public partial class Assign2_Calc : System.Web.UI.Page
{
protected void ButtonEqual_Click(object sender, EventArgs e)
{
string inputStr = inputBox.Text;
if (inputStr == string.Empty)
{
inputBox.Text = "mehhhhhh";
}
else
{
inputBox.Text = inputStr; //result.ToString();
}
}
}
下面是我的.aspx页面:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Calc.aspx.cs"
Inherits="Assign2_Calc" Debug="true" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<link href="CalculatorStyle.css" rel="stylesheet" type="text/css" />
<script>
var maxInputLength = 20;
function checkButtonClick(clickedValue) {
var buttonValue = clickedValue;
var inputStr = document.getElementById('inputBox').value;
if (buttonValue == '<--') {
if (inputStr.length >= 1) {
document.getElementById('inputBox').value = inputStr.substring(0, inputStr.length - 1);
}
}
else if (buttonValue == 'C') {
document.getElementById('inputBox').value = "";
}
else {
if (inputStr.length < maxInputLength) {
document.getElementById('inputBox').value = inputStr + buttonValue;
}
else {
//document.getElementById('msg').innerHTML = "Maxmum length is " + maxInputLength;
}
}
return false;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<div id="main" class="main">
<div id="content" class="content">
<h3 id="h3">Simple Calculator</h3>
<div id="calculatorDiv">
<table cellpadding="0" cellspacing="0">
<tr>
<td colspan="4">
<asp:TextBox runat="server" CssClass="inputBox" ReadOnly="true" ViewStateMode="Enabled" ID="inputBox"></asp:TextBox>
</td>
</tr>
<tr>
<td colspan="4">
<br />
</td>
</tr>
<tr>
<td>
<asp:Button ID="ButtonNum7" runat="server" Text="7" CssClass="CalcButtons" OnClientClick="return checkButtonClick(7)" />
</td>
<td>
<asp:Button ID="ButtonNum8" runat="server" Text="8" CssClass="CalcButtons" OnClientClick="return checkButtonClick(8)" />
</td>
<td>
<asp:Button ID="ButtonNum9" runat="server" Text="9" CssClass="CalcButtons" OnClientClick="return checkButtonClick(9)" />
</td>
<td>
<asp:Button ID="ButtonDivide" runat="server" Text="/" CssClass="CalcButtons" OnClientClick="return checkButtonClick('/')" />
</td>
</tr>
<tr>
<td>
<asp:Button ID="ButtonNum4" runat="server" Text="4" CssClass="CalcButtons" OnClientClick="return checkButtonClick(4)" />
</td>
<td>
<asp:Button ID="ButtonNum5" runat="server" Text="5" CssClass="CalcButtons" OnClientClick="return checkButtonClick(5)" />
</td>
<td>
<asp:Button ID="ButtonNum6" runat="server" Text="6" CssClass="CalcButtons" OnClientClick="return checkButtonClick(6)" />
</td>
<td>
<asp:Button ID="ButtonMultiply" runat="server" Text="*" CssClass="CalcButtons" OnClientClick="return checkButtonClick('*')" />
</td>
</tr>
<tr>
<td>
<asp:Button ID="Button1" runat="server" Text="1" CssClass="CalcButtons" OnClientClick="return checkButtonClick(1)" />
</td>
<td>
<asp:Button ID="Button2" runat="server" Text="2" CssClass="CalcButtons" OnClientClick="return checkButtonClick(2)" />
</td>
<td>
<asp:Button ID="Button3" runat="server" Text="3" CssClass="CalcButtons" OnClientClick="return checkButtonClick(3)" />
</td>
<td>
<asp:Button ID="ButtonSubtract" runat="server" Text="-" CssClass="CalcButtons" OnClientClick="return checkButtonClick('-')" />
</td>
</tr>
<tr>
<td>
<asp:Button ID="ButtonDackspace" runat="server" Text="<--" CssClass="CalcButtons" OnClientClick="return checkButtonClick('<--')" />
</td>
<td>
<asp:Button ID="ButtonNum0" runat="server" Text="0" CssClass="CalcButtons" OnClientClick="return checkButtonClick(0)" />
</td>
<td>
<asp:Button ID="ButtonClear" runat="server" Text="C" CssClass="CalcButtons" OnClientClick="return checkButtonClick('C')" />
</td>
<td>
<asp:Button ID="ButtonAdd" runat="server" Text="+" CssClass="CalcButtons" OnClientClick="return checkButtonClick('+')" />
</td>
</tr>
<tr>
<td colspan="4">
<asp:Button ID="ButtonEqual" runat="server" Text="=" CssClass="CalcButtonEqual" OnClick="ButtonEqual_Click" />
</td>
</tr>
</table>
</div>
</div>
</div>
</div>
</form>
</body>
</html>
查看您的网页来源,我发现您有disabled文本框.如果控件是disabled无法编辑的,则在提交表单时会排除其内容.因此,不是禁用(disable完全删除属性),而是将文本框设置为readonly(readonly = 'true').