购物中数量加减如何控制在正整数范围内
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所有回答(2)
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点击减少按钮时，获取一次值进行判断，如果等于0值不变，大于零就减1
能给代码提示一下吗？我虽然也知道思路，但是代码一直写不对
@杨杨昵: 把你的代码贴出来我看看哪里不对
@车窗外徘徊:
protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
{
if (e.CommandName.Length > 0 && e.CommandName == "reduce" )
{
int index = e.Item.ItemIndex;
TextBox textbox3 = (TextBox)DataList1.Items[0].FindControl("textbox3");
TextBox textbox4 = (TextBox)DataList1.Items[0].FindControl("textbox4");
Button button6 = (Button)DataList1.Items[0].FindControl("button6");
Connstrclass connstrclass = new Connstrclass();
SqlConnection conn = connstrclass.GetConnection();
string sql1 = "select Cart_Num=@p2 from tb_ShoppingCart where Goods_Id=@p1";
SqlCommand cmd1 = new SqlCommand(sql1, conn);
SqlParameter[] paras1 ={
new SqlParameter("@p2",textbox3 .Text ),
new SqlParameter("@p1",DataList1.DataKeys[e.Item .ItemIndex ].ToString ()),
};
conn.Open();
int result1 = ConnDBHelper.ExecuteCommand(sql1, paras1);
if (textbox3.Text.Trim () == "1")
{
button6.Enabled = false;
DataList1.DataBind();
}
else
{
string sql = "update tb_ShoppingCart set Cart_Num=Cart_Num-1 from tb_ShoppingCart where Goods_Id=@p1";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlParameter[] paras ={ new SqlParameter("@p1",DataList1.DataKeys[e.Item .ItemIndex ].ToString ()),
};
int result = ConnDBHelper.ExecuteCommand(sql, paras);
conn.Close();
DataList1.DataBind();
}
}
这部分是减数量的代码，有个问题是如果购物车中有两件商品，只能减第一件，点击第二件商品的减数量button，就不行了，麻烦帮我看看，谢谢了
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当点击的时候，获取textbox的值，判断如果小于等于0的时候，按钮不能点击或者点击还是0即可
代码怎么写啊？我在datalist中做数量加减，需要控制每一行都能加减，我写了代码只有第一行能加减而且控制在了1以上，其他的不行，怎么办啊？
protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
{
if (e.CommandName.Length > 0 && e.CommandName == "reduce" )
{
int index = e.Item.ItemIndex;
TextBox textbox3 = (TextBox)DataList1.Items[0].FindControl("textbox3");
TextBox textbox4 = (TextBox)DataList1.Items[0].FindControl("textbox4");
Button button6 = (Button)DataList1.Items[0].FindControl("button6");
Connstrclass connstrclass = new Connstrclass();
SqlConnection conn = connstrclass.GetConnection();
string sql1 = "select Cart_Num=@p2 from tb_ShoppingCart where Goods_Id=@p1";
SqlCommand cmd1 = new SqlCommand(sql1, conn);
SqlParameter[] paras1 ={
new SqlParameter("@p2",textbox3 .Text ),
new SqlParameter("@p1",DataList1.DataKeys[e.Item .ItemIndex ].ToString ()),
};
conn.Open();
int result1 = ConnDBHelper.ExecuteCommand(sql1, paras1);
if (textbox3.Text.Trim () == "1")
{
button6.Enabled = false;
DataList1.DataBind();
}
else
{
string sql = "update tb_ShoppingCart set Cart_Num=Cart_Num-1 from tb_ShoppingCart where Goods_Id=@p1";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlParameter[] paras ={ new SqlParameter("@p1",DataList1.DataKeys[e.Item .ItemIndex ].ToString ()),
};
int result = ConnDBHelper.ExecuteCommand(sql, paras);
conn.Close();
DataList1.DataBind();
}
}
减数量部分代码是这样的，帮我看看哪里有问题，谢谢了
@杨杨昵: 这玩意看代码没用，思想就那样，
1.前端得到值判断~~
2.后端得到值在进行判断以下~~~
