Question

我有一个场景，我有类别和子类别的下拉列表。我想在前端添加相应子类别下的子类别。我已经完成了类别部分的同步。请帮我添加相应类别下的子类别。

请查看我到目前为止的代码： -

<div>
    <asp:TextBox ID="txtCategoryAdding" runat="server"></asp:TextBox>
    <asp:TextBox ID="txtDescription" runat="server" TextMode="MultiLine"></asp:TextBox><br />
    <br />
    <asp:Button ID="btnAdd" Text="Add Category" Width="100" runat="server" OnClick="btnAdd_Click" />
</div>

按钮点击代码以添加类别： -

protected void btnAdd_Click(object sender, EventArgs e)
{
    using (SqlConnection con = new SqlConnection())
    {
        string query;
        SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultSQLConnectionString"].ConnectionString);
        conn.Open();
        query = "Insert into Categories_For_Merchant values ('" + txtCategoryAdding.Text + "', '" + txtDescription.Text + "')";
        SqlCommand cmd = new SqlCommand(query, conn);
        cmd.ExecuteNonQuery();
        conn.Close();
        Response.Write("<script>alert('Category added succesfully');</script>");
        txtCategoryAdding.Text = "";
        txtDescription.Text = "";
    }
}

Answer 1

您可以在div中添加一个面板并将其隐藏，然后在插入类别按钮上单击即可显示它此面板应包含要提交的子类别控件。

Answer 2

在数据库中创建一个能够作为parent_id的字段，并记住categoryId和parentId是不同的字段所以你的桌子看起来像这样 categoryId categoryName parentId和其他。

在第一个文本框之前为parentCategory添加一个下拉列表。

  <div>
    <asp:DropDownList ID="ddl_parent" runat="server" Width="160px" ></asp:DropDownList>
    <asp:TextBox ID="txtCategoryAdding" runat="server"></asp:TextBox>
    <asp:TextBox ID="txtDescription" runat="server" TextMode="MultiLine"></asp:TextBox>
    <br />
    <asp:Button ID="btnAdd" Text="Add Category" Width="100" runat="server" OnClick="btnAdd_Click"
    />
 </div>


   on page_load event on .cs page

  protected void Page_Load(object sender, EventArgs e)
      {

       SqlConnection conn = new  SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultSQLConnectionString"].ConnectionString);
    conn.Open();  
        SqlDataAdapter ad1 = new SqlDataAdapter();
        ad1.SelectCommand = new SqlCommand("select categoryID,categoryName from  
                   Categories_For_Merchant where parent_id=0",conn);
        ds = new DataSet();
        ad1.Fill(ds,"parent_cat");


        ddl_parent.DataSource = ds.Tables["parent_cat"];
        ddl_parent.DataTextField = "categoryID";
        ddl_parent.DataValueField = "categoryName ";
        ddl_parent.DataBind();
        ddl_parent.Items.Insert(0, new ListItem("Select", "0"));
        conn.close();

}

提交按钮后

    protected void btnAdd_Click(object sender, EventArgs e)
  {
   using (SqlConnection con = new SqlConnection())
   {
    string query;
    SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultSQLConnectionString"].ConnectionString);
    conn.Open();
    query = "Insert into Categories_For_Merchant values (ddl_category.selectedItem.value,'" + txtCategoryAdding.Text + "', '" + txtDescription.Text + "')";
    SqlCommand cmd = new SqlCommand(query, conn);
    cmd.ExecuteNonQuery();
    conn.Close();
    Response.Write("<script>alert('Category added succesfully');</script>");
    txtCategoryAdding.Text = "";
    txtDescription.Text = "";
}

}

在代码后面的类别下添加子类别

2 个答案: