檢查是否選中了復選框 - ASP.NET

Question

我有以下代碼：

（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>

現在，我將布爾變量發送到SQL數據庫。 問題只出現在未經檢查的方框中。 我的意思是，當你檢查一些復選框時，它會將其發送為真（這是正確的）但是當我取消選中它時它保持不變（真實）。

另外：為什么太少？ 這是一個查詢...這里沒什么特別的

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...

數據類型是位....我也嘗試使用字符串...但沒有成功

PS - 我也嘗試過Request.Form [“apple”]，取消選中工作......但遺憾的是檢查沒有...當我選中復選框時它會拋出一個錯誤：

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

有人？

Answer 1

所以經過很長一段時間的組合和其他東西它工作...沒有任何javascripts和隱藏的字段...這是.cs代碼

        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

發布表單時，不會提交未選中的復選框。 你必須寫一個解決方法。

一種方法是通過復選框的javascript填充隱藏字段。

Answer 3

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 4

實際上，使用runat =“server”獲取輸入字段的選中值更准確。

string isAppleChecked = apple.Attributes [“checked”]！= null && apple.Attributes [“checked”] ==“checked”？ “{真假}”;

Answer 5

首先，我會在開頭整理你的代碼，if語句是不必要的：

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

您是否嘗試過使用CheckBox類而不是輸入？

<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 6

它應該工作，因為數據類型是位...至少當你將bool傳遞給存儲過程時。

由於您的代碼中包含SQL更新語句，請嘗試將bool轉換為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);