[Solved] Using ScriptRegistrar in Master and Content Pages

[aozora]

Hi,
I need to register a group of common script in my Site.master, and also a specific script for one of my view, but it result in the error "You cannot call render more than once".
How can I do to use your extesions in both masterpages and views?

[Kazi Manzur Rashid]

Hi aozora,

Please make sure:

1. Site.master has the ScriptRegistrar at the bottom of the page, usually before the body tag.
2. The ScriptRegistrar of Site.master will only have Render(). For example:

 <% Html.Telerik().ScriptRegistrar()  
    .Scripts(script => script.GetGroup(  
            "myGroup",  
            group => group.Add("file1.js")  
            .Add("file2")  
            .Combined(true)  
          )  
     )  
   .Render(); %>

3. Ensure that Content page does not have any Render() :

 <% Html.Telerik().ScriptRegistrar()  
    .Scripts(script => script.AddGroup(  
            "myGroup",  
            group => group.Add("file3.js")  
            .Add("file4")
          )  
     ) %>

4. You have registered the HttpHandler in web.config as shown in the help.

As you can see content page is responsible for adding the group and the master page is getting the same group for adding the shared files.

Best wishes,

Kazi Manzur Rashid

the Telerik team

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[aozora]

Great! That's works. Thanks a lot!

[Marco Teodoro]

hello i'm trying to use the script register in master and on a user control but i'm getting this error:

You cannot call render more than once.

this is my code on masterpage
<%Html.Telerik().ScriptRegistrar().Scripts(script =>
      script.GetGroup("sg",
                group => group.Add("~/Scripts/2010.1.309/jquery-1.4.2.min.js")
                             .Add("~/Scripts/jquery/jquery.bgiframe-2.1.1.js")
                             .Add("~/Scripts/jquery/jquery.toJSON.js")
                             .Add("~/Scripts/jquery/ui/jquery.ui.core.js")
                             .Add("~/Scripts/jquery/jquery.corner.js")
                             .Add("~/Scripts/jquery/jquery.timers-1.2.js")
                             .Add("~/Scripts/jquery/idle-timer.js")
                             .Add("~/Scripts/jquery/jquery.center.js")
                             .Add("~/Scripts/jquery/jquery.gradient.js")
                             .Add("~/Scripts/jquery/jquery.checkboxtree.js")
                             .Add("~/Scripts/jquery/jquery.simpletip-1.3.1.min.js")
                             .Add("~/Scripts/jquery/ui/jquery.ui.widget.js")
                             .Add("~/Scripts/jquery/ui/jquery.ui.mouse.js")
                             .Add("~/Scripts/jquery/ui/jquery.ui.draggable.js")
                             .Add("~/Scripts/jquery/ui/jquery.ui.position.js")
                             .Add("~/Scripts/jquery/ui/jquery.ui.resizable.js")
                             .Add("~/Scripts/jquery/ui/jquery.ui.dialog.js")
                             .Add("~/Scripts/jquery/ui/jquery.effects.core.js")
                             .Add("~/Scripts/jquery/ui/jquery.effects.explode.js")
                             .Add("~/Scripts/jquery/ui/jquery.effects.fold.js")
                             .Add("~/Scripts/jquery/ui/jquery.ui.accordion.js")
                        .Combined(true)
                            )
                         )
                         .Globalization(true)
                         .Render();%>

and this is the code on user control

<%= Html.Telerik().ScriptRegistrar()  
    .Scripts(script => script.AddGroup(  
            "sg",  
            group => group.Add("~/Scripts/2010.1.309/jquery-1.4.2.min.js")
          )  
     ) %>

what i'm doing wrong?

best regards

[Atanas Korchev]

Hi Marco Teodoro,

As the exception name suggests the ScriptRegistar should not be rendered more than once. The <%= %> block calls the Render() method behind the curtain to output the HTML of the ScriptRegistrar. To avoid this exception simply change this code:

<%= Html.Telerik().ScriptRegistrar()  
    .Scripts(script => script.AddGroup(  
            "sg",  
            group => group.Add("~/Scripts/2010.1.309/jquery-1.4.2.min.js")
          )  
     ) %>

to:
<% Html.Telerik().ScriptRegistrar()  
    .Scripts(script => script.AddGroup(  
            "sg",  
            group => group.Add("~/Scripts/2010.1.309/jquery-1.4.2.min.js")
          )  
     ) %>

The rule of thumb is that <%= %> expects a single statement which returns object while <% %> is for executing arbitrary code which does not return any result. This is the reason why <% %> requires the explicit call of Render() while <%= %> does not.

Regards,
Atanas Korchev
the Telerik team

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