Rank: Advanced Member
Groups: Member
Joined: 4/14/2008
Posts: 33
Points: 99
Location: Cali Colombia
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Hello, can someone tell me how to use the control Treeview in a page .aspx ?.It is generating an error rendering:
[NullReferenceException: Object reference not set to an instance of an object.]
CSSFriendly.Helpers.HeadContainsLinkHref(Page page, String href) +48
CSSFriendly.Helpers.RegisterEmbeddedCSS(String css, Type type, Page page) +74
CSSFriendly.TreeViewAdapter.RegisterScripts() +84
CSSFriendly.TreeViewAdapter.OnInit(EventArgs e) +119
System.Web.UI.Control.InitRecursive(Control namingContainer) +8705966
System.Web.UI.Control.InitRecursive(Control namingContainer) +210
System.Web.UI.Control.InitRecursive(Control namingContainer) +210
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +378
thank you very much.
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Rank: Administration
Groups: Administration
, Member
Joined: 10/7/2008
Posts: 505
Points: 1,515
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There seems to be a bug in the CSSFriendlyAdapters project (an old project to clean up asp.net html output). http://www.asp.net/cssadapters/http://cssfriendly.codeplex.com/http://code.google.com/p/aspnetcontroladapters/Not all controls had adapters. Custom adapters were added by contribs. As a fix: \Cuyahoga.Web\App_Browsers\CSSFriendlyAdapters.browser Comment out the entry for the TreeViewAdapter that is causing you the error. Code:
< !-- < adapter controlType="System.Web.UI.WebControls.TreeView" adapterType="CSSFriendly.TreeViewAdapter" / > -- >
This should make things work again.
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Rank: Administration
Groups: Administration
, Member
Joined: 10/7/2008
Posts: 505
Points: 1,515
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The TreeViewAdadpter tries to register javascripts directly to the page head: Code:// TreeViewAdapter.js
Helpers.RegisterClientScript("CSSFriendly.JavaScript.TreeViewAdapter.js", type, this.Page); This throws a null reference error as Cuyahoga registers css and js to the template. So css friendly adapters that require js can not be used. I have never used the TreeView control with Cuyahoga and as such never had this error. It is good to know about it though.
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