telerik - Cannot read property 'length' of null: using `sender.set_selectedToggleStateIndex(val)` within a nested function that is used as a radprompt callback -

telerik - Cannot read property 'length' of null: using `sender.set_selectedToggleStateIndex(val)` within a nested function that is used as a radprompt callback -

i'm getting "typeerror: cannot read property 'length' of null" when calling sender.set_selectedtogglestateindex(val) within nested function used radprompt callback.

sender radbutton (buttontype = toggle; toggletype = customtoggle).

although may not relevant: radbutton initiated in radgrid via custom gridtemplatecolumn.

ontogglevaluechangingresulthandler = function (sender, e, args, result) { if ((result) ? result.isvalid : false) { homecoming true; } else { if (result.statuscode == 200) { radprompt(result.message, ontogglevaluechangingpromptcallbackfn, 400, 350, null, result.title || "prompt - override", false); } else { radalert(result.message || "internal error occurred!", 400, 350, result.title || "alert - error", null, null); } homecoming false; } function ontogglevaluechangingpromptcallbackfn(promptargs) { promptargs = promptargs || { "override": false, "note": "" }; if (promptargs.override && promptargs.note.length > 0) { args.override = promptargs.override; args.overridenote = promptargs.note; var result = paysheet.xhr.post(args._uri, args); result.isvalid = true; if ((result) ? result.isvalid : false) { // $find(sender.id).set_selectedtogglestateindex(args.newindex); sender.set_selectedtogglestateindex(args.newindex); } else { if (result.statuscode == 200) { radalert(result.message || "override request denied!", 400, 350, result.title || "alert - override denied", null, null); } else { radalert(result.message || "internal error occurred!", 400, 350, result.title || "alert - error", null, null); } } } else { // ensuring command retains same value; prompt async; } } }

this pattern seems work radcombobox , series of radtextboxes. additionally, eventargs seem more robust.

i suspect issue rooted in clientstate persistence , referencing: controlstates and/or viewstate beingness lossed.

if effort phone call sender.get_selectedtogglestate() or sender.get_selectedtogglestateindex() in promptcallbackfn, error stating this._functionality undefined. _functionality seems in regards controlstate.

note:

sender.get_clientstatefieldid() returns clientid properly, $find(sender.get_clientstatefieldid()) returns null.

sender.get_togglestatedata() returns info properly. sender.get_togglestates() returns null.

sender.get_parent() returns null.

the reply turned out to set autopostback = false of radbutton.

such minor oversight.

the postback went unnoticed me because of nature of these controls.

telerik