Getting this message: this._loadingPanelsToHide.length is null or not an object

[Alex]

Hello all,

We have an application that uses Telerik controls which works perfectly, however  every time we change to another option page before the previous one has been fully uploaded, we got this message (this is done from menu options):

this._loadingPanelsToHide.length is null or not an object

and when we accept to debug it, it points to this line:
$create(Telerik.Web.UI.RadAjaxManager, {"_updatePanels":"","ajaxSettings":[{InitControlID : "pnImportBatch",UpdatedControls : [{ControlID:"pnImportBatch",PanelID:"rlpImportBatch"}]}],"clientEvents":{OnRequestStart:"",OnResponseEnd:""},"defaultLoadingPanelID":"","enableAJAX":true,"enableHistory":false,"links":[],"styles":[],"uniqueID":"ramImportBatch","updatePanelsRenderMode":0}, null, null, $get("ramImportBatch"));

How can we prevent this error message to appear ?

Regards

[Alex]

Any idea ?

[Sebastian]

Hello Alex,

It seems that the array of loading panels is not fully initialized in this particular case and causes the error generation. To avoid it, you may consider disabling the grid until the asynchronous request on paging operation finishes execution. Examine the help articles linked below for more details on the suggested approach:

http://www.telerik.com/help/aspnet-ajax/ajxdisablecontrolsduringajax.html
http://www.telerik.com/help/aspnet-ajax/grdenabledconventions.html

Best regards,
Sebastian
the Telerik team

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