I am using radfileexplorer (35 version telerik dll) through a custom provider.I have used some client side functions (eg :onCreatenewfolder,onMovedirectory..etc) to perform foldername,length validation folder's existance checking etc..While doing these,
if any validation is failed , i set args.setCancel(true),return false; statements ;even though server side provider methods (eg: CreateDirectory,MoveDirecory ) firing automatically based on the desired actions.How to prevent these event firing?.Please help me by sending exact code.
Regards,
Praveen.
11 Answers, 1 is accepted
To prevent firing a server-side functionality you need to cancel the corresponding client-side event (as you have tried). In order to correctly cancel client-side event you need to call set_cancel(true) (not args.setCancel(true)) method in the event handler.
Could you please correct this error and see if the execution is canceled properly?
Regards,
Dobromir
the Telerik team
Rank 1
Are your examples in http://www.telerik.com/help/aspnet-ajax/fileexplorer-client-side-events.html incorrect? They show using args.set_cancel(true);
When would we use args.set_cancel(true) and when just set_cancel(true)?
Rank 1
This gets a javascript Undefined error...
The args.set_cancel(true) doesnt get this Undefined error - but doesnt cancel the postback... Any ideas?
I'm trying to do some javascript validation in OnClientCreateNewFolder. If validation fails (like a folder with that name exists... or invalid characters) , I dont want to create the folder. I dont want the client script to continue on..
Please accept my apologies for not being clear enough in my previous post.
The correct way to prevent execution of a client-side event (that is cancelable) is to call set_cancel() method of the arguments object, e.g.:
args.set_cancel(true)Regarding the issue that you experience, I am not quite sure I understand the exact case. Creating a new folder does not trigger a postback. Do you have custom implementation of this functionality? If so, could you please provide a sample page demonstrating the issue so we can investigate it further?
All the best,
Dobromir
the Telerik team
Rank 1
Hello Team,
Its urgent ...we are uisng current version of telerik controls..and i want to firing the server side event when cleint side validation fails.
I have used eventArgs.set_cancel(true);,but it says undefined error.
could you please tell me fast.
I am afraid that the exact scenario you want to achieve is not clear for me. Can you elaborate a bit on:
- which are the exact server-side events you are trying to prevent and
- which are the exact client-side events you are to canceling?
Regards,
Vessy
Telerik by Progress
Rank 1
Hi Vessy
I am trying to prevent event. But args.set_cancel(false); it gives an error "set_cancel" is not a function.
can you tell me fast?
Can you, please, elaborate a bit on the scenario in which the issue occurs?
- Which event are you trying to cancel?
- Can you verify that the args object is defined in the event handler parameters?
- Can you verify that the event itself is cancelable?
It will be really helpful if you send us a sample setup (including the control declaration and the event handler) so we can see what is causing the issue.
Regards,
Vessy
Progress Telerik
Rank 1
this is my javascript function
function Validatebutton(sender, eventArgs) {
debugger
try {
eventArgs.set_cancel = false;
var SelectUser = $telerik.findControl(document.documentElement, "drpMarketinguser");
var Startdate = $telerik.findControl(document.documentElement, "Dpstartdate");
var ChkMarketing = $telerik.findControl(document.documentElement, "ChkMarketingcredit");
var dropdown = document.getElementsByClassName("classdrpMarketinguser");
var datepicker = document.getElementsByClassName("classDpstartdate");
SelectUser = SelectUser._selectedText;
ChkMarketing = ChkMarketing._checked;
Startdate = Startdate._dateInput._displayText;
if (ChkMarketing) {
if (SelectUser == "" && Startdate == "Select Start Date") {
dropdown[0].style.backgroundColor = "red";
datepicker[0].style.backgroundColor = "red";
ChkMarketing._checked = false;
//radalert("Please Select User and Enter Start Date",500,200,"Alert");
eventArgs.set_cancel=true;
}
else if (SelectUser == "") {
dropdown[0].style.backgroundColor = "red";
//radalert("Please Select User", 400, 200, "Alert");
ChkMarketing._checked = false;
eventArgs.set_cancel=true;
}
else if (Startdate == "Select Start Date") {
datepicker[0].style.backgroundColor = "red";
// radalert("Please Enter Start Date", 400, 200, "Alert");
ChkMarketing._checked = false;
eventArgs.set_cancel=true;
}
}
}
catch (err) {
var msg = err.message;
eventArgs.set_cancel=true;
}
}
and this is my button event
<telerik:RadButton RenderMode="Lightweight" ID="ApplyButton" runat="server" ButtonType="SkinnedButton" Text="Apply" ToolTip="Apply" BackColor="DodgerBlue" ForeColor="White" OnClick="ApplyButton_Click" CommandName="StayWindow" OnClientClicked="Validatebutton"/>
I want to cancel serverside event if client side validation is failed.
The OnClientClicked event of RadButton is triggered after the click and cannot be canceled:
https://docs.telerik.com/devtools/aspnet-ajax/controls/button/client-side-programming/events/onclientclicked
In order to prevent be able to prevent the click of a button, you have to assign a handler to its OnClientClicking event, which can be canceled:
https://docs.telerik.com/devtools/aspnet-ajax/controls/button/client-side-programming/events/onclientclicking
For example:
<telerik:RadButton RenderMode="Lightweight" ID="ApplyButton" runat="server" ButtonType="SkinnedButton" Text="Apply" ToolTip="Apply" BackColor="DodgerBlue" ForeColor="White" OnClick="ApplyButton_Click" CommandName="StayWindow" OnClientClicking="Validatebutton" /><script> function Validatebutton(sender, eventArgs) { eventArgs.set_cancel(true); }</script>Regards,
Vessy
Progress Telerik
Rank 1