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vb.net controls
group:how to add a warning to DeleteCommand of gridview?
vb.net controls:
On Mon, 29 May 2006 19:00:07 +0200, "Averell" <averell@iets.uk> wrote: >Hi, > >I made a gridview with VWD. The gridview has the Delete button set >(ShowDeleteButton="True" in the <asp:CommandField>). >It works perfect, but i would like to add a warning before the record is >deleted to prevent deleting a wrong record. >I did this in the code-behind file: >Protected Sub GridView1_RowDeleting(ByVal sender As Object, ByVal e As >System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles >GridView1.RowDeleting > Dim jv As String > jv = "<script language='javascript'>" _ > & " alert('beware!');" _ > & "if (! confirm('if you want to delete it, click on OK'));" _ > & " {window.location.href='mult.aspx'};" _ > & "</script>" > Response.Write(jv) >End Sub > >I see effectively the warning, but when i click on OK or on Cancel of the >Confirm, in both cases the record is deleted. >Is it possible to prevent that, and if yes, how? > >Thanks for any hints >Averell > > You need to return the results of confirm. Peter Kellner
Hi,
I made a gridview with VWD. The gridview has the Delete button set (ShowDeleteButton="True" in the <asp:CommandField>). It works perfect, but i would like to add a warning before the record is deleted to prevent deleting a wrong record. I did this in the code-behind file: Protected Sub GridView1_RowDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles GridView1.RowDeleting Dim jv As String jv = "<script language='javascript'>" _ & " alert('beware!');" _ & "if (! confirm('if you want to delete it, click on OK'));" _ & " {window.location.href='mult.aspx'};" _ & "</script>" Response.Write(jv) End Sub I see effectively the warning, but when i click on OK or on Cancel of the Confirm, in both cases the record is deleted. Is it possible to prevent that, and if yes, how? Thanks for any hints Averell
Peter, i made a function and returned the confirm result, but even clicking
on Cancel, the record is deleted ... I inserted an ALERT after the 'return false' and it's not executed. The Java code stops indeed, but not the VB code deleting the row. Is this the right way to proceed? thanks Protected Sub GridView1_RowDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles GridView1.RowDeleting Dim jv As String jv = "<script language='javascript'>" _ & "function check()" _ & "{" _ & " alert('let op');" _ & " var ok=confirm('if you want to delete it, click on OK');" _ & " if (!ok)" _ & " {" _ & " window.location.href='mult.aspx';" _ & " return false;" _ & " alert('this is not shown');" _ & "};" _ & "};" _ & "check();" _ & "</script>" Response.Write(jv) End Sub [quoted text, click to view] "PeterKellner" <pkellnernews@73rdstreet.com> wrote in message news:sdkm72lelrgl11njic1cp6sto563ib86dr@4ax.com... > On Mon, 29 May 2006 19:00:07 +0200, "Averell" <averell@iets.uk> wrote: > > >Hi, > > > >I made a gridview with VWD. The gridview has the Delete button set > >(ShowDeleteButton="True" in the <asp:CommandField>). > >It works perfect, but i would like to add a warning before the record is > >deleted to prevent deleting a wrong record. > >I did this in the code-behind file: > >Protected Sub GridView1_RowDeleting(ByVal sender As Object, ByVal e As > >System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles > >GridView1.RowDeleting > > Dim jv As String > > jv = "<script language='javascript'>" _ > > & " alert('beware!');" _ > > & "if (! confirm('if you want to delete it, click on OK'));" _ > > & " {window.location.href='mult.aspx'};" _ > > & "</script>" > > Response.Write(jv) > >End Sub > > > >I see effectively the warning, but when i click on OK or on Cancel of the > >Confirm, in both cases the record is deleted. > >Is it possible to prevent that, and if yes, how? > > > >Thanks for any hints > >Averell > > > > > > You need to return the results of confirm. > Peter Kellner > http://peterkellner.net
You should look the example at :
ms-help://MS.VSExpressCC.v80/MS.NETFramework.v20.en/dv_aspnetcon/html/2c688b1a-93a4-4dad-b82b-63974bdbb13e.htm Then you might paste the code of Page_Load into your Row_Deleting event handler. Don't forget to Cancel delete by default !!
"olrt" <olrt@ifrance.com> wrote in
news:1148980408.206982.11150@u72g2000cwu.googlegroups.com: [quoted text, click to view] > ms-help://MS.VSExpressCC.v80/MS.NETFramework.v20.en/dv_aspnetcon/html/2 > c688b1a-93a4-4dad-b82b-63974bdbb13e.htm Check out this site: http://www.codeproject.com/aspnet/NingLiangSimpleControl.asp Ning Liang packaged up some javascript into a web control that will return the results of it's confirm action in the request.form. You can trap the delete button event, call the msgbox1.confirm function and trap for the form variable in the load or prerender event since the msgbox1.confirm does a postback. --
With VWD 2005, I've the following message when I click to continue :
-----------------------------------------------------------------8<------------------------------------------------------- Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. -----------------------------------------------------------------8<-------------------------------------------------------
What Peter Kellner means is that you need to inject some clientside
javascript when you're creating your delete button and return the results of the Confirm. In this scenario the RowDeleting serverside event would not even fire if the user clicks Cancel because the delete click would be cancelled on the clientside. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/GridViewEx10.asp Do a search on the word 'OnClientClick' and you can see some specific code on delete confirmation. Regards, Andy
Hi, i'm a little confused with all those solutions. Meanwhile i did this and
i feel i'm close to the solution (??). The only thing i miss is how to pass the result of the function check() to VB. Thanks Dim jv As String jv = "function check()" _ & "{" _ & " alert('warning');" _ & " var ok=confirm(if you want to delete; click on OK');" _ & " if (!ok)" _ & " {" _ & " window.location.href='mult.aspx';" _ & " return false;" _ & "};" _ & "};" _ & "check();" Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "myscript", jv, True) dim x as string x= result of function check() : HOW TO DO THIS? if x="False" then e.cancel=True [quoted text, click to view] <CaffieneRush@gmail.com> wrote in message news:1149023245.227871.240380@y43g2000cwc.googlegroups.com... > What Peter Kellner means is that you need to inject some clientside > javascript when you're creating your delete button and return the > results of the Confirm. > In this scenario the RowDeleting serverside event would not even fire > if the user clicks Cancel because the delete click would be cancelled > on the clientside. > > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/GridViewEx10.asp > Do a search on the word 'OnClientClick' and you can see some specific > code on delete confirmation. > > Regards, > Andy >
ASP.NET20: Simple gridview ex. with del. confirm:
http://www.hellobasic.com/cgi-bin/forum/YaBB.pl?board=dotnet;action=display;num=1137191330 "Averell" <erb@ifgfets.uk> schreef in bericht news:eCgsy8HhGHA.4656@TK2MSFTNGP04.phx.gbl... [quoted text, click to view] > Hi, i'm a little confused with all those solutions. Meanwhile i did this > and > i feel i'm close to the solution (??). > The only thing i miss is how to pass the result of the function check() to > VB. > Thanks > > Dim jv As String > jv = "function check()" _ > & "{" _ > & " alert('warning');" _ > & " var ok=confirm(if you want to delete; click on OK');" _ > & " if (!ok)" _ > & " {" _ > & " window.location.href='mult.aspx';" _ > & " return false;" _ > & "};" _ > & "};" _ > & "check();" > > Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "myscript", jv, > True) > > dim x as string > x= result of function check() : HOW TO DO THIS? > if x="False" then e.cancel=True > > > <CaffieneRush@gmail.com> wrote in message > news:1149023245.227871.240380@y43g2000cwc.googlegroups.com... >> What Peter Kellner means is that you need to inject some clientside >> javascript when you're creating your delete button and return the >> results of the Confirm. >> In this scenario the RowDeleting serverside event would not even fire >> if the user clicks Cancel because the delete click would be cancelled >> on the clientside. >> >> > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/GridViewEx10.asp >> Do a search on the word 'OnClientClick' and you can see some specific >> code on delete confirmation. >> >> Regards, >> Andy >> > >
Edwin Knoppert a =E9crit : [quoted text, click to view] > ASP.NET20: Simple gridview ex. with del. confirm: > > http://www.hellobasic.com/cgi-bin/forum/YaBB.pl?board=3Ddotnet;action=3Dd= isplay;num=3D1137191330 >=20 Functional and simple. Thanks very much !
I finally see where the confusion comes from.
The return we are talking about is not a return to the serverside code but to the button's click event. So cancel will cancel the click event while a confirm will continue with the click which would then go onto trigger a postback to the server. Take a look at Edwin's code in this thread to see a complete example of this in action. My only suggestion is that the line below can be simplified within Default2.aspx.vb: If b IsNot Nothing Then b.Attributes.Add("onclick", "javascript:window.event.returnValue=confirm('Delete?');") to: If b IsNot Nothing Then b.OnClientClick = "return confirm('Delete?');" Regards, Andy ps. If you are still resistant to this simple solution then you can use javascript to write the value of your ok variable to a hidden field in the page and check this hidden field on the postback. [quoted text, click to view] Averell wrote:
> Hi, i'm a little confused with all those solutions. Meanwhile i did this and > i feel i'm close to the solution (??). > The only thing i miss is how to pass the result of the function check() to > VB. > Thanks > > Dim jv As String > jv = "function check()" _ > & "{" _ > & " alert('warning');" _ > & " var ok=confirm(if you want to delete; click on OK');" _ > & " if (!ok)" _ > & " {" _ > & " window.location.href='mult.aspx';" _ > & " return false;" _ > & "};" _ > & "};" _ > & "check();" > > Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "myscript", jv, > True) > > dim x as string > x= result of function check() : HOW TO DO THIS? > if x="False" then e.cancel=True > > > <CaffieneRush@gmail.com> wrote in message > news:1149023245.227871.240380@y43g2000cwc.googlegroups.com... > > What Peter Kellner means is that you need to inject some clientside > > javascript when you're creating your delete button and return the > > results of the Confirm. > > In this scenario the RowDeleting serverside event would not even fire > > if the user clicks Cancel because the delete click would be cancelled > > on the clientside. > > > > > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/GridViewEx10.asp > > Do a search on the word 'OnClientClick' and you can see some specific > > code on delete confirmation. > > > > Regards, > > Andy > >
Fair point about assuming javascript. It is better to be safe so code
below has be changed. If b IsNot Nothing Then b.OnClientClick = "javascript:return confirm('Delete?');" I don't understand how a postback could have occured after returning false to the control's OnClick event. The line below should cause the button to never postback to the server no matter how many time it is clicked. If b IsNot Nothing Then b.OnClientClick = "javascript:return false;" Regards, Andy [quoted text, click to view] Edwin Knoppert wrote:
> Btw, imo by removing "javascript:" from the line you assume that the browser > interpret's the code as javascript by default. > Maybe you better keep "javascript:" in at all times. > I have not investigated this but i assumed this. > > > > <CaffieneRush@gmail.com> schreef in bericht > news:1149102085.178478.127330@j55g2000cwa.googlegroups.com... > >I finally see where the confusion comes from. > > The return we are talking about is not a return to the serverside code > > but to the button's click event. So cancel will cancel the click event > > while a confirm will continue with the click which would then go onto > > trigger a postback to the server. > > > > Take a look at Edwin's code in this thread to see a complete example of > > this in action. > > My only suggestion is that the line below can be simplified within > > Default2.aspx.vb: > > If b IsNot Nothing Then b.Attributes.Add("onclick", > > "javascript:window.event.returnValue=confirm('Delete?');") > > > > to: > > If b IsNot Nothing Then b.OnClientClick = "return confirm('Delete?');" > > > > Regards, > > Andy > > > > ps. If you are still resistant to this simple solution then you can use > > javascript to write the value of your ok variable to a hidden field in > > the page and check this hidden field on the postback. > > > > Averell wrote: > >> Hi, i'm a little confused with all those solutions. Meanwhile i did this > >> and > >> i feel i'm close to the solution (??). > >> The only thing i miss is how to pass the result of the function check() > >> to > >> VB. > >> Thanks > >> > >> Dim jv As String > >> jv = "function check()" _ > >> & "{" _ > >> & " alert('warning');" _ > >> & " var ok=confirm(if you want to delete; click on OK');" _ > >> & " if (!ok)" _ > >> & " {" _ > >> & " window.location.href='mult.aspx';" _ > >> & " return false;" _ > >> & "};" _ > >> & "};" _ > >> & "check();" > >> > >> Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "myscript", jv, > >> True) > >> > >> dim x as string > >> x= result of function check() : HOW TO DO THIS? > >> if x="False" then e.cancel=True > >> > >> > >> <CaffieneRush@gmail.com> wrote in message > >> news:1149023245.227871.240380@y43g2000cwc.googlegroups.com... > >> > What Peter Kellner means is that you need to inject some clientside > >> > javascript when you're creating your delete button and return the > >> > results of the Confirm. > >> > In this scenario the RowDeleting serverside event would not even fire > >> > if the user clicks Cancel because the delete click would be cancelled > >> > on the clientside. > >> > > >> > > >> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/GridViewEx10.asp > >> > Do a search on the word 'OnClientClick' and you can see some specific > >> > code on delete confirmation. > >> > > >> > Regards, > >> > Andy > >> > > >
I never understood the differences myself.
For my code i was looking for a simple click-abort (on no, abort), that's all.. However afaik at that time the return statement itself was insufficient somehow and still produced a round-trip?? I forgot what exactly happend at that time, maybe someone can shed some light on these differences? Thanks, <CaffieneRush@gmail.com> schreef in bericht news:1149102085.178478.127330@j55g2000cwa.googlegroups.com... [quoted text, click to view] >I finally see where the confusion comes from. > The return we are talking about is not a return to the serverside code > but to the button's click event. So cancel will cancel the click event > while a confirm will continue with the click which would then go onto > trigger a postback to the server. > > Take a look at Edwin's code in this thread to see a complete example of > this in action. > My only suggestion is that the line below can be simplified within > Default2.aspx.vb: > If b IsNot Nothing Then b.Attributes.Add("onclick", > "javascript:window.event.returnValue=confirm('Delete?');") > > to: > If b IsNot Nothing Then b.OnClientClick = "return confirm('Delete?');" > > Regards, > Andy > > ps. If you are still resistant to this simple solution then you can use > javascript to write the value of your ok variable to a hidden field in > the page and check this hidden field on the postback. > > Averell wrote: >> Hi, i'm a little confused with all those solutions. Meanwhile i did this >> and >> i feel i'm close to the solution (??). >> The only thing i miss is how to pass the result of the function check() >> to >> VB. >> Thanks >> >> Dim jv As String >> jv = "function check()" _ >> & "{" _ >> & " alert('warning');" _ >> & " var ok=confirm(if you want to delete; click on OK');" _ >> & " if (!ok)" _ >> & " {" _ >> & " window.location.href='mult.aspx';" _ >> & " return false;" _ >> & "};" _ >> & "};" _ >> & "check();" >> >> Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "myscript", jv, >> True) >> >> dim x as string >> x= result of function check() : HOW TO DO THIS? >> if x="False" then e.cancel=True >> >> >> <CaffieneRush@gmail.com> wrote in message >> news:1149023245.227871.240380@y43g2000cwc.googlegroups.com... >> > What Peter Kellner means is that you need to inject some clientside >> > javascript when you're creating your delete button and return the >> > results of the Confirm. >> > In this scenario the RowDeleting serverside event would not even fire >> > if the user clicks Cancel because the delete click would be cancelled >> > on the clientside. >> > >> > >> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/GridViewEx10.asp >> > Do a search on the word 'OnClientClick' and you can see some specific >> > code on delete confirmation. >> > >> > Regards, >> > Andy >> > >
Btw, imo by removing "javascript:" from the line you assume that the browser
interpret's the code as javascript by default. Maybe you better keep "javascript:" in at all times. I have not investigated this but i assumed this. <CaffieneRush@gmail.com> schreef in bericht news:1149102085.178478.127330@j55g2000cwa.googlegroups.com... [quoted text, click to view] >I finally see where the confusion comes from. > The return we are talking about is not a return to the serverside code > but to the button's click event. So cancel will cancel the click event > while a confirm will continue with the click which would then go onto > trigger a postback to the server. > > Take a look at Edwin's code in this thread to see a complete example of > this in action. > My only suggestion is that the line below can be simplified within > Default2.aspx.vb: > If b IsNot Nothing Then b.Attributes.Add("onclick", > "javascript:window.event.returnValue=confirm('Delete?');") > > to: > If b IsNot Nothing Then b.OnClientClick = "return confirm('Delete?');" > > Regards, > Andy > > ps. If you are still resistant to this simple solution then you can use > javascript to write the value of your ok variable to a hidden field in > the page and check this hidden field on the postback. > > Averell wrote: >> Hi, i'm a little confused with all those solutions. Meanwhile i did this >> and >> i feel i'm close to the solution (??). >> The only thing i miss is how to pass the result of the function check() >> to >> VB. >> Thanks >> >> Dim jv As String >> jv = "function check()" _ >> & "{" _ >> & " alert('warning');" _ >> & " var ok=confirm(if you want to delete; click on OK');" _ >> & " if (!ok)" _ >> & " {" _ >> & " window.location.href='mult.aspx';" _ >> & " return false;" _ >> & "};" _ >> & "};" _ >> & "check();" >> >> Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "myscript", jv, >> True) >> >> dim x as string >> x= result of function check() : HOW TO DO THIS? >> if x="False" then e.cancel=True >> >> >> <CaffieneRush@gmail.com> wrote in message >> news:1149023245.227871.240380@y43g2000cwc.googlegroups.com... >> > What Peter Kellner means is that you need to inject some clientside >> > javascript when you're creating your delete button and return the >> > results of the Confirm. >> > In this scenario the RowDeleting serverside event would not even fire >> > if the user clicks Cancel because the delete click would be cancelled >> > on the clientside. >> > >> > >> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/GridViewEx10.asp >> > Do a search on the word 'OnClientClick' and you can see some specific >> > code on delete confirmation. >> > >> > Regards, >> > Andy >> > >
It was a long time ago and i had much to learn about js and asp.net.
I really don't know what happened and at this time i have no time to check this out unf.. I just polled if one had a similar experiance :) Thanks, <CaffieneRush@gmail.com> schreef in bericht news:1149116840.512829.32710@u72g2000cwu.googlegroups.com... [quoted text, click to view] > Fair point about assuming javascript. It is better to be safe so code > below has be changed. > If b IsNot Nothing Then b.OnClientClick = "javascript:return > confirm('Delete?');" > > I don't understand how a postback could have occured after returning > false to the control's OnClick event. > The line below should cause the button to never postback to the server > no matter how many time it is clicked. > If b IsNot Nothing Then b.OnClientClick = "javascript:return false;" > > Regards, > Andy > > Edwin Knoppert wrote: >> Btw, imo by removing "javascript:" from the line you assume that the >> browser >> interpret's the code as javascript by default. >> Maybe you better keep "javascript:" in at all times. >> I have not investigated this but i assumed this. >> >> >> >> <CaffieneRush@gmail.com> schreef in bericht >> news:1149102085.178478.127330@j55g2000cwa.googlegroups.com... >> >I finally see where the confusion comes from. >> > The return we are talking about is not a return to the serverside code >> > but to the button's click event. So cancel will cancel the click event >> > while a confirm will continue with the click which would then go onto >> > trigger a postback to the server. >> > >> > Take a look at Edwin's code in this thread to see a complete example of >> > this in action. >> > My only suggestion is that the line below can be simplified within >> > Default2.aspx.vb: >> > If b IsNot Nothing Then b.Attributes.Add("onclick", >> > "javascript:window.event.returnValue=confirm('Delete?');") >> > >> > to: >> > If b IsNot Nothing Then b.OnClientClick = "return confirm('Delete?');" >> > >> > Regards, >> > Andy >> > >> > ps. If you are still resistant to this simple solution then you can use >> > javascript to write the value of your ok variable to a hidden field in >> > the page and check this hidden field on the postback. >> > >> > Averell wrote: >> >> Hi, i'm a little confused with all those solutions. Meanwhile i did >> >> this >> >> and >> >> i feel i'm close to the solution (??). >> >> The only thing i miss is how to pass the result of the function >> >> check() >> >> to >> >> VB. >> >> Thanks >> >> >> >> Dim jv As String >> >> jv = "function check()" _ >> >> & "{" _ >> >> & " alert('warning');" _ >> >> & " var ok=confirm(if you want to delete; click on OK');" _ >> >> & " if (!ok)" _ >> >> & " {" _ >> >> & " window.location.href='mult.aspx';" _ >> >> & " return false;" _ >> >> & "};" _ >> >> & "};" _ >> >> & "check();" >> >> >> >> Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "myscript", >> >> jv, >> >> True) >> >> >> >> dim x as string >> >> x= result of function check() : HOW TO DO THIS? >> >> if x="False" then e.cancel=True >> >> >> >> >> >> <CaffieneRush@gmail.com> wrote in message >> >> news:1149023245.227871.240380@y43g2000cwc.googlegroups.com... >> >> > What Peter Kellner means is that you need to inject some clientside >> >> > javascript when you're creating your delete button and return the >> >> > results of the Confirm. >> >> > In this scenario the RowDeleting serverside event would not even >> >> > fire >> >> > if the user clicks Cancel because the delete click would be >> >> > cancelled >> >> > on the clientside. >> >> > >> >> > >> >> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/GridViewEx10.asp >> >> > Do a search on the word 'OnClientClick' and you can see some >> >> > specific >> >> > code on delete confirmation. >> >> > >> >> > Regards, >> >> > Andy >> >> > >> > >
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