[英]sql c# delete syntax for div id
嗨,我有一個與某些Java腳本綁定的刪除按鈕,如下所示:
<script type="text/javascript">
function confirm_delete()
{
if (confirm("Are you sure you want to delete this comment?")==true)
return true;
else
return false;
}
</script>
<p>
<asp:Button ID="btn" OnClientClick="if(confirm_delete()){/* post back*/}else{return false;};" OnClick="btnDelete_Click" runat="server" Text="delete"/>
在后面的代碼中,我有這個:
using (OdbcCommand cmd = new OdbcCommand("SELECT idWallPosting, wp.WallPostings, p.PicturePath FROM WallPosting wp LEFT JOIN User u ON u.UserID = wp.UserID LEFT JOIN Pictures p ON p.UserID = u.UserID WHERE wp.UserID=" + userId + " ORDER BY idWallPosting DESC", cn))
{
using (OdbcDataReader reader = cmd.ExecuteReader())
{
test1.Controls.Clear();
while (reader.Read())
{
System.Web.UI.HtmlControls.HtmlGenericControl div = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
div.Attributes["class"] = "test";
div.ID = String.Format("{0}", reader.GetString(0));
// the Div ID is set to my idWallPosting in my WallPosting Table
Image img = new Image();
img.ImageUrl = String.Format("{0}", reader.GetString(2));
img.AlternateText = "Test image";
div.Controls.Add(img);
div.Controls.Add(ParseControl(String.Format("   " + "{0}", reader.GetString(1))));
div.Attributes.Add("onclick", "return confirm_delete();");
div.Style["clear"] = "both";
test1.Controls.Add(div);
}
}
}
}
}
protected void btnDelete_Click(object sender, EventArgs e)
{
//serverside code if confirm was pressed to delete from WallPosting table based on Div ID.
}
我后面的代碼的第一部分是動態添加div並將id =添加到idWallPosting,我認為我應該這樣做,所以在刪除它們時,我要做的就是引用div.ID,但不確定如何添加字符串將div id轉換為字符串,以便將其傳遞給我的sql語法?
必須從html端而不是服務器端獲取,在執行時加載div時其輸出如下所示:
(螢火蟲)
<div id="ctl00_ContentPlaceHolder1_ContentPlaceHolder2_26"><div>
我如何剝離ct100 contentplaceholder等,以獲取最終編號(26),並將其作為字符串放置在我的刪除按鈕中?
編輯:(帕特里克)
protected void btnDelete_Click(object sender, EventArgs e)
{
idWallPosting = Div.ID;
//serverside code if confirm was pressed.
using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
{
cn.Open();
using (OdbcCommand cmd = new OdbcCommand("DELETE FROM WallPosting WHERE idWallPosting = "+idWallPosting+")", cn))
{
cmd.ExecuteNonQuery();
}
}
PopulateWallPosts(); //error here
}
編輯:
protected void btnDelete_Click(object sender, EventArgs e)
{
string id = "ctl00_ContentPlaceHolder1_ContentPlaceHolder2_26";
string[] idFragments = id.Split('_');
id = idFragments[idFragments.Length - 1];
//serverside code if confirm was pressed.
using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
{
cn.Open();
using (OdbcCommand cmd = new OdbcCommand("DELETE FROM WallPosting WHERE idWallPosting = " + id + ")", cn))
{
cmd.ExecuteNonQuery();
}
}
//PopulateWallPosts();
}
什么也沒做。
如果您將div作為控件發送回服務器端..這就是您要嘗試執行的操作(如果我錯了,請原諒我)
從外觀上看,您正在設置div,以便在單擊它們時...在刪除之前要求確認?
因此,每當您單擊div時,您都希望獲得回發信息?
只是把它扔在那里...但是使用jquery並進行ajax調用會更好。
更新資料
您可以使用隱藏控件...
<input id="tsIdValue" type="hidden" runat="server" />
然后在服務器端,您可以使用以下方法從隱藏控件中獲取值:
tsId = tsIdValue.value;
當您構建div並調用confirm_delete方法時,您可以執行以下操作:
div.Attributes.Add("onclick", "return confirm_delete(this.id);");
當您單擊div ...時,您想通過JavaScript將隱藏控件的值設置為div的ID。
function confirm_delete(id)
{
if (confirm("Are you sure you want to delete this comment?")==true)
tsIdValue.value = id;
return true;
else
return false;
}
您仍然需要使用__doPostBack()
調用來讓javascript導致發回郵件
因此,當單擊div時,您要刪除還是只單擊按鈕就刪除?
如果只是單擊按鈕,則可以使用CommandArgument傳遞您的ID。
如果是div,則再次需要將ID傳遞給您的Confirm_delete以獲取參考。
編輯:1
查看您的代碼和注釋,別無選擇,只能進行ajax回發,因為默認情況下,單擊div不會像asp.net按鈕那樣觸發回發。 而且您想執行div click的Button_Click事件,這也不正確。
盡管我認為刪除整個div並不是一個好主意。 如果用戶不小心單擊div並彈出消息,將非常煩人。
編輯2:
如果有幫助,請參考以下示例:
<div id="testdiv" runat="server">Hello world</div>
//Pass record id to your confirm_delete
int id = 10;
testdiv.Attributes.Add("onclick", "return confirm_delete(" + id.ToString() + ");");
//Updated confirm_delete function
<script type="text/javascript">
function confirm_delete(id){
if (confirm('Are you sure you want to delete?')) {
__doPostBack('DivClicked', id);
}
else {
return false;
}
}
</script>
//This goes in your Page_Load code-behind
if (Page.IsPostBack)
{
//It is a postback so check if it was by div click
string target = Request["__EVENTTARGET"];
if (target == "DivClicked")
{
string id = Request["__EVENTARGUMENT"];
//Call you delete function passing record id
Response.Write(id.ToString());
}
}
使用ASP.Net(.net 4.0之前的版本),它將自動在ID的開頭附加一些內容,以確保其唯一性。 簡而言之,您將無法完全擺脫這一點,但是您可以將ID的相關部分拆分出來,以便在sql查詢中使用。 我會這樣做:
//Note this is just for demonstration purposes you will need to actually get the Id of
//Id the control here
string id = "ctl00_ContentPlaceHolder1_ContentPlaceHolder2_26";
string[] idFragments = id.Split('_');
id = idFragments[idFragments.Length - 1];
這會在下划線字符上分割Id字符串,然后返回結果數組中的最后一個元素。 然后,您可以在SQL查詢中使用它。
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