angularjs - How do I remove watchers created by a template which was added and removed dynamically using $compile? -


we have directive allows developers specify own template , data used scope bound template using $compile. template have angular expressions create watchers.

when element's content represented template , scope removed dom tree, how remove watchers created it?

this link proves watchers stay when dom represent removed tree.

clicking compile button first time compile angular template , attach dom tree. second time button clicked, empty element previous template added , add newly compiled template.

index.html

<!doctype html> <html ng-app="app">   <head>     <script data-require="jquery@1.7.2" data-semver="1.7.2" src="//cdnjs.cloudflare.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>     <script data-require="angular.js@1.2.6" data-semver="1.2.6" src="https://code.angularjs.org/1.2.6/angular.js"></script>     <link rel="stylesheet" href="style.css" />     <script src="smart-table-debug.js"></script>     <script src="script.js"></script>   </head>    <body ng-controller="controller">     <h1>compile demo</h1>      html compile<br/>     <textarea id="html" ng-model="html"></textarea>     <br/>      result<br/>     <div id="result"></div>     <br/>     <input type="button" value="compile" ng-click="compile()" />     <br/>     compile time: {{ compiletime }}<br/>     watchers count: {{ watcherscount }}<br/>     digest count: {{ digestcount }} <br/>     total time taken: {{ totaltime }} milliseconds <br/>   </body> </html>

script.js

function getallscopes( rootscope, allscopes ) {   if( !allscopes ) {     allscopes = [];   }   allscopes.push( rootscope );    for( var scope = rootscope.$$childhead; scope; scope = scope.$$nextsibling ) {     getallscopes( scope, allscopes );   }    return allscopes; }  angular.module( "app", [] ) .controller( "controller", ["$scope", "$compile", "$rootscope", "$timeout", function($scope, $compile, $rootscope, $timeout ){    var e = angular.element;    $scope.html = "<div>{{watcherscount}}</div>"   $scope.watcherscount = 0;   $scope.digestcount = 0;   $scope.compileclickstart = performance.now();   $scope.totaltime = 0;    /* because didn't gave watch expression 1st parameter functionn,    * function called @ every end of digest cycle.    * https://docs.angularjs.org/api/ng/type/$rootscope.scope#$digest    */   $rootscope.$watch(function() {     $scope.digestcount += 1;     $scope.totaltime = performance.now() - $scope.compileclickstart;   });    $scope.compile = function(){     $scope.digestcount = 0;     $scope.compileclickstart = performance.now();          var inserttarget = e('#result');         var targetscope = $scope.$new();          inserttarget.empty();         t0 = performance.now();         var expandedcontent = $compile($scope.html)(targetscope);         t1 = performance.now();         $scope.compiletime = (t1 - t0) + " milliseconds.";         inserttarget.append( expandedcontent );          $timeout( function() {             var allscopes = getallscopes($rootscope);             var allwatchers = [];             for( var = 0; < allscopes.length; i++ ) {               var scope = allscopes[i];               if( scope.$$watchers) {                 //allwatchers = allwatchers.concat( scope.$$watchers );               for( var j = 0; j < scope.$$watchers.length; j++ ) {               allwatchers.push({                             "scope" : scope,                             "watcher" : scope.$$watchers[j]                          });               }               }             }             console.log( allscopes );             $scope.watcherscount = allwatchers.length;         });   };  }]);

as mentioned tgh, watchers removed when dom , scope lives in destroyed. if isn't happening you, can reference element's scope , destroy scope manually, removing watchers.

irrelevant code omitted brevity.

var expandedcontent;  $scope.compile = function(){   // ...    var inserttarget = e('#result');   var targetscope = $scope.$new();    if (expandedcontent) {     expandedcontent.scope().$destroy();   }   inserttarget.empty();    expandedcontent = $compile($scope.html)(targetscope);   inserttarget.append( expandedcontent );    // ... }

if have have functionality in directive, it's cleaner when done in link function. listen when element removed dom , clean scope accordingly.

link: function (scope, element, attrs) {   element.on("$destroy", function () {     scope.$destroy();   }) }

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