每次刷新页面以显示标签并使按钮不可见的问题 [英] Problem to refresh the page everytime to show the label and to make buttons invisble

问题描述

我在gridview中显示了一个购物车..在这里，我显示了产品名称，数量，价格等.数量可以更新..

我也提供了删除功能，因此我们可以从购物车中删除产品.

当购物车变空时，我想隐藏gridview.我也想隐藏按钮..并显示标签...您的购物车中没有商品.."我的页面在ajax更新面板中..所有东西都工作正常..但是，如果我删除产品从gridview中显示的购物车中删除..该产品被删除..但是我必须刷新页面以显示具有值您的购物车中没有物品"的标签，并且不显示更新和下订单按钮..

这是我实现的代码.

i have a shpping cart showin in gridview.. where i have shown product name , quantity , price etc.. quantitiy can b updateable..

i have also give delete fuctionality so we can delete product from shopping cart..

when the cart become empty i want to hide gridview. i also want to hide button.. and show the lable... " your have not items in your shopping cart.." my page is in ajax update panel.. all the thing are working fine.. but if i delete the product from shopping cart shown in gridview.. the product get deleted.. but i have to refreash the page to show the label having value " you have no items in your cart" and to invisible the update and the place order button..

here is the code i implemented..

if (ShoppingCart.GetItems(User.Identity.Name).Count > 0)
       {
           btnupdatecart.Visible = true;
           btnplaceorder.Visible = true;
       }
             //ObjectDataSource1.DataBind();
       if (GridView1.Rows.Count == 0)
       {
           Labelinfo.Visible = true; // containing value your cart doesn't contain any item
           btnupdatecart.Visible = false;
           btnplaceorder.Visible = false;

       }
       else
       {
           Labelinfo.Visible = false;
       }

我该怎么办..我从购物车中删除了产品，因为它变空了.那么我就不需要刷新页面了.该页面会自动显示购物车中没有Itmes".

what i have to do.. that i delte th product from cart as it becomes empty. then i have no need to refresh the page. the page automatically shows the " you have no itmes in your cart"

推荐答案

您好，farooq，

如果您使用的是gridview，则设置其空数据字符串，以便当gridview中没有数据时，它将显示标签.

希望对您有帮助

谢谢&问候
斯里曼(Sriman)

Hi farooq,

I f you are using a gridview then set its empty data string so it will display the lable whenver there is no data in gridview.

I hope this helps

Thanks & regards
Sriman

如果您在网格视图行命令事件触发时在页面中使用Updatepanel，则该页面将完全呈现.

因此，请在
后的ur Page中添加此代码

Hi,
If ur using Updatepanel in the page when grid view row command event fire the page is mot fully rendered .

So add this code in ur Page after

<triggers>
<asp:postbacktrigger controlid="GridView1" xmlns:asp="#unknown" />  
</triggers>

并且当Grid没有任何数据时，请使用GridView1.DataSource = String.Empty;
对于标签控制，请编写类似
的代码

and when Grid doesn''t have any data Use GridView1.DataSource = String.Empty;
For Lable Control write Code Like

if(GridView1.DataSource == String.Empty || GridView1.DataSource == null)
{
   label1.Text = "Your Message";
} 

如果仍然有问题，请将网格和按钮放在面板中，并在需要时隐藏面板.

If Still u have problem Place the grid and buttons in a panel and Hide the Panel when needed.

您好 只需重新绑定网格，然后更新更新面板即可.

Hi Just rebind your grid and after that update the update panel.

this.UPDATEPANEL_ID.update();

UPDATEPANEL_ID是您的更新面板的ID.

希望它能起作用.
谢谢
费萨尔

UPDATEPANEL_ID is the id of your update panel.

Hope it works.
Thanks
Faisal

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