Question

我有以下代码：

（some.aspx.cs）

        if(Page.IsPostBack)
        {
        bool apple2 = false;
        bool pizza2 = false;
        bool orange2 = false;
        if (apple.Checked)
            apple2 = true;
        if (pizza.Checked)
            pizza2 = true;
        if (orange.Checked)
            orange2 = true;
        }

（some.aspx）

     <tr>
     <td>Food:</td>
     <td>Apple <input type="checkbox" name="food" id="apple" value="apple" runat="server" />Pizza <input type="checkbox" name="food" id="pizza" value="pizza" runat="server" />Orange <input type="checkbox" name="food" id="orange" value="orange" runat="server" /></td>
 </tr>

现在，我将布尔变量发送到SQL数据库。问题仅出在未选中框中。我的意思是，当你检查一些复选框时，它会将其发送为真（这是正确的）但是当我取消选中它时它保持不变（真实）。

增加：为什么太少？这是一个查询......这里没什么特别的

string q = string.Format(@"UPDATE tblUsers SET ......., apple='{8}', orange='{9}' WHERE id='{10}'", ...., apple2, orange2, id);
lib.sql_query(q); // using my sql library...

数据类型是位....我也尝试使用字符串...但没有成功

P.S。 - 我也尝试过Request.Form [“apple”]，取消选中工作......但不幸的是检查没有...当我选中复选框时它会抛出一个错误：

Conversion failed when converting the varchar value 'on' to data type bit.

有人？

Answer 1

所以经过很长时间的组合和其他东西它起作用...没有任何javascripts和隐藏的领域... 那是.cs代码

        bool apple2 = (Request.Form["apple"] == "on") ? true : false;
        bool orange2 = (Request.Form["orange"] == "on") ? true : false;
        bool pizza2 = (Request.Form["pizza"] == "on") ? true : false;

Answer 2

发布表单时未提交未选中的复选框。你必须写一个解决方法。

一种方法是使用隐藏字段通过复选框的javascript填充。

Answer 3

首先，我会在开头整理你的代码，if语句是不必要的：

if (Page.IsPostback)
{
    bool appleSelected = apple.Checked;
    bool pizzaSelected = pizza.Checked;
    bool orangeSelected = orange.Checked;
}

您是否尝试使用CheckBox类而不是输入？

<asp:CheckBox id="apple" value="apple" runat="server" Checked="True|False" />
<asp:CheckBox id="pizza" value="pizza" runat="server" Checked="True|False" />
<asp:CheckBox id="orange" value="orange" runat="server" Checked="True|False" />

Answer 4

它应该工作，因为数据类型是位...至少当你将bool传递给存储过程时。

由于您的代码中有SQL更新语句，请尝试将bool转换为0或1。

Int16 iApple = (apple2) ? 1 : 0;
Int16 iOrange = (orange2) ? 1 : 0;
string query = string.Format(@"UPDATE tblUsers SET ......., apple='{8}', orange='{9}'    WHERE id='{10}'", ...., iApple, iOrange, id);
lib.sql_query(q);

Answer 5

using System.Data.SqlClient;
using System.Data;

public partial class _Default : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection("Data Source=RND3 " + "\\" + " SQLEXPRESS;Initial Catalog=SSSolutionFiles;Integrated Security=True");
    public void displaygrid()
    {
        SqlDataAdapter da = new SqlDataAdapter("select * from userfile", con);
        DataSet ds = new DataSet();
        da.Fill(ds, "p");
        GridView1.DataSource = ds.Tables["p"];
        GridView1.DataBind();
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        //Label1.Text = txtUserName.Text + "<br>" + txtPassword.Text + "<br>" + txtConfirmPassword.Text + "<br>" + txtConfirmationNumber.Text;
        displaygrid();
        if (!IsPostBack)
            BindDropDownListData();
    }

    public void BindDropDownListData()
    {
        //SqlConnection con = new SqlConnection("Data Source=RND3 " + "\\" + " SQLEXPRESS;Initial Catalog=SSSolutionFiles;Integrated Security=True");
        //SqlConnection mySqlConnection = new SqlConnection();
        {
            try
            {
                con.Open();
                SqlCommand mySqlCommand = new SqlCommand("Select username from userfile ", con);
                SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(mySqlCommand);
                DataSet myDataSet = new DataSet();
                mySqlDataAdapter.Fill(myDataSet);
                //DropDownList1.DataSource = myDataSet;
                //DropDownList1.DataTextField = "username";
                //DropDownList1.DataValueField = "username";
                //DropDownList1.DataBind();
                CheckBoxList1.DataSource = myDataSet;
                CheckBoxList1.DataTextField = "username";
                CheckBoxList1.DataValueField = "username";
                CheckBoxList1.DataBind();
            }
            catch (Exception ex)
            {
                Label1.Text = ex.Message;
            }
            finally
            {
                con.Close();
            }
        }
    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        SqlCommand cmd = new SqlCommand("insert into userfile values('" + txtUserName.Text + "','" + txtPassword.Text + "','" + txtConfirmPassword.Text + "','" + txtConfirmationNumber.Text + "')", con);
        con.Open();
        cmd.ExecuteScalar();
        displaygrid();
        BindDropDownListData();
    }
    protected void btnUpdate_Click(object sender, EventArgs e)
    {
        SqlCommand cmd = new SqlCommand("update userfile set confirmnumber='" + txtConfirmationNumber.Text + "', password='" + txtPassword.Text + "',confirmpassword='" + txtConfirmPassword.Text + "' where username='" + txtUserName.Text + "' ", con);
        con.Open();
        cmd.ExecuteScalar();
        displaygrid();
    }
    protected void btnDelete_Click(object sender, EventArgs e)
    {
        SqlCommand cmd = new SqlCommand("delete from userfile where username='" + txtUserName.Text + "' ", con);
        con.Open();
        cmd.ExecuteScalar();
        displaygrid();
        BindDropDownListData();
    }
    protected void btnClear_Click(object sender, EventArgs e)
    {
        txtConfirmationNumber.Text = "";
        txtUserName.Text = "";
        txtConfirmPassword.Text = "";
        txtPassword.Text = "";
    }
    protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
    {
        if (CheckBox1.Checked == true)
        {
            foreach (ListItem checkboxitems in CheckBoxList1.Items)
            {
                checkboxitems.Selected = true;
            }
        }
        else if (CheckBox1.Checked == false)
        {
            foreach (ListItem listItem in CheckBoxList1.Items)
            {
                listItem.Selected = false;
            }
        }
    }
}

Answer 6

使用runat =＆＃34; server＆＃34;来获取输入字段的选中值实际上更准确。

string isAppleChecked = apple.Attributes [＆＃34; checked＆＃34;]！= null ＆安培;＆安培; apple.Attributes [＆＃34;已检查＆＃34;] ==＆＃34;已检查＆＃34; ？＆＃34; {TRUE}＆＃34; ：＆＃34; {false}＆＃34;;

检查是否选中了复选框 - ASP.NET

6 个答案: