javascript - ng-bind-html blank the page when binding data change -

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i trying achieve quora's read on feature when expanded more content displayed.

i using ng-bind-html binding html page p element. 

<p ng-show="viewmodel.level==0" ng-bind-html="viewmodel.content0 | sanitize"> <p ng-show="viewmodel.level==1" ng-bind-html="viewmodel.content1 | sanitize">

the expanding works fine, when collapse level 1 0 (more content less), html page went blank stuck there until click or drag page.

how avoid ?

i answer accident.

what need notification list size has changed:

$scope.$broadcast('scroll.resize');

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