如何隐藏asp.net中datalist中的particalr下拉列表 [英] How to hide a particualr drop down list in datalist in asp.net

问题描述

大家好，

我正在显示一些来自数据库的产品，用于在线购物。在数据列表的下拉列表中可用的库存。问题是我想要隐藏添加到购物车按钮并在库存可用时为0下拉库存。所以我尝试在项目数据绑定事件上执行此操作，但它要么隐藏所有ddl，要么隐藏所有ddls。

请给我一个解决方案。这是我的代码：

Hi all,
I am displaying some products from database for online shopping with their no. of stock available in drop down list in a datalist. The problem is I want to hide the add to cart button and drop down of stock if the stock available is 0. So I have tried doing it on item databound event but it either hides all the ddls or hides none.
Kindly give me a solution for it. here is my code:

DataTable dtResult = bl_NecklaceSets.fetching_products_NecklaceSets();
            if (dtResult.Rows.Count != 0)
            {

                for (int i_count = 0; i_count < dtResult.Rows.Count; i_count++)
                {
                    i_out_of_stock_value = Convert.ToInt32(dtResult.Rows[i_count]["Out_Of_stock"]);
                    if (i_out_of_stock_value == 1)
                    {
                        dtResult.Rows[i_count].SetField("Product_Name", (dtResult.Rows[i_count]["Product_Name"]).ToString() + " - Already Sold");
                        dtResult.AcceptChanges();
                        DropDownList ddlQuantity = ((DropDownList)(dtlst_Necklace_Sets.NamingContainer.FindControl("dd_quntity")));
                        string str_quantity = ddlQuantity.SelectedItem.Text.ToString();
                           ;
                        if (str_quantity == "0")
                        {
                            ddlQuantity.Visible = false;
                        }
                        else
                        {
                            ddlQuantity.Visible = true;
                        }

                        
                    }

上面显示的方法是页面加载而不是在数据库中。在数据绑定中，我这样做：

The method above shown is in page load not in databound. In data bound i have done it like this:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                DataTable dtResult = bl_NecklaceSets.fetching_products_NecklaceSets();
                for (int i_count = 0; i_count < dtResult.Rows.Count; i_count++)
               {
                    i_out_of_stock_value = Convert.ToInt32(dtResult.Rows[i_count]["Out_Of_stock"]);
                    if (i_out_of_stock_value == 1)
                    {
                        DropDownList ddlQuantity  = ((DropDownList)(e.Item.FindControl("dd_quntity"))) ;
                       string str_quantity = Convert.ToString(((DropDownList)(e.Item.FindControl("dd_quntity"))).SelectedItem.Text);
                       if (str_quantity == "0")
                        {
                            ddlQuantity.Visible = false;
                       }
                        else
                       {
                           ddlQuantity.Visible = true;
                      }

。

请帮忙！

.
Please help !

推荐答案

嗨Taresh，



您可以使用ItemDataBound事件更新特定项目。

Hi Taresh,

You can use ItemDataBound Event to update a particular item.

<asp:datalist id="" runat="server" onitemdatabound="DataListItemEventHandler" xmlns:asp="#unknown"> 
</asp:datalist>

proctected void OnRowDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
  DropDownList ddlQuantity  = ((DropDownList)(e.Item.FindControl("dd_quntity"))) ;
  //Find current value
  if (currValue.Equals("0"))
  {
      ddlQuantity.Visible = false;
  }
  else
  {
      ddlQuantity.Visible = true;
  }
}
}

嗨Taresh，



使用OnRowDataBound方法更新每一行。

Hi Taresh,

Use OnRowDataBound method to update each row.

proctected void OnRowDataBound(object sender, EventArg e)
{
  DropDownList ddlQuantity  = ((DropDownList)(e.Item.FindControl("dd_quntity"))) ;
  if (ddlQuantity.SelectedItem.Text.Equals("0"))
  {
      ddlQuantity.Visible = false;
  }
  else
  {
      ddlQuantity.Visible = true;
  }
}

希望这对你有帮助。

hope this will help you.

HI，我自己在数据绑定上解决了这个问题。我的数据主义者的事件。我只是做了一些条件并遍历了datalist的所有行..如果条件为真，那个特定行'的DDL隐藏其他保持正常。 ！



谢谢大家的帮助！

I solved this myself on databound event of my datalist. I just made some condition and iterated through all the rows of the datalist.. if the condition was true than that particular row''s DDL hides else stays normal. !

Thank u all for your help !

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