angularjs - HTML text binding in view(with trustAsHtml) from JSON, having ng-Class does not evaluate properly -


i'm having header 2 solid div's 1 below other. when scroll page, i've included animation in controller hide bottom div. top div has couple of changes when scroll down page. i'm controlling smallheader.floatitright , smallheader.floatitleft in ng-class. can see ss_header.html(directive template) ordinary div has class smallheader.floatitrightworks while 'smallheader.floatitright' in ng-class binding json file not work properly. ideas or thoughts on this? in advance.

json file has key , corresponding value:

"headerhtmlcontent":"<p class=\"coupons-text\" data-ng-class=\"smallheader.floatitright\">{{clippedcoupons}} coupons clipped | savings:</p><p class=\"printable-text\">printable | <a href=\"#\" class=\"disable-text\" data-ng-class=\"smallheader.floatitleft\">direct2card</a></p></div>",

main html having directive: 

 <ss-header styles="smallheader" show="showheader" header="headerhtml"></ss-header>

directive.js: 

myapp.directive("ssheader", ['$compile', function($compile) {   return {     restrict: "e", //directive element      //replace: true, //replace custom tag     scope:{         show:'=show',         headerhtml: '=header',         smallheader: '=styles'     },      templateurl: 'common/header/ss_header.html',   } }]);

directive html template:

<!--binding json-->     <header data-ng-show="show" class="ss-header" data-ng-bind-html="headerhtml|convertashtml">     </header> <!--normal div ng-class works-->     <div data-ng-class="smallheader.floatitright">sample div show smallheader.floatitright works!!</div>

controller: 

angular.element($window).bind("scroll", function() {             var scrollpos = $(this).scrolltop();             if(scrollpos > previoustop){                $scope.fadeanimation = true;                $scope.smallheader = {                     floatitright: "fright",                     floatitleft: "fleft"                }             }             else                 $scope.fadeanimation = false;             previoustop = scrollpos;             $scope.$apply();                 });  var generalserv = new fetchservicedata($service.api.ss_resp);      generalserv.save().$promise.then(function(response){          $scope.headerhtml = $interpolate(response.en_us.sitelayout.headerhtmlcontent)($scope);      },function(err){         console.log('error in fetching service data')     });

styles.css

.fleft{float:left;} .fright{float:right;}  .coupons-text.fright{float:right;} .disable-text.fleft{float:left;}

ng-bind-html not work because got directives , interpolation in html. angulars ngbindhtml directive used plain html only. in ssheader directive need compile header string. trick.

angular.module('myapp', [])    .controller('mycontroller', ['$scope',      function($scope) {        $scope.showheader = true;        $scope.smallheader = {          'fleft': false,          'fright': false,        };        $scope.headerhtml = "<p class=\"coupons-text\" data-ng-class=\"styles\">{{clippedcoupons}} coupons clipped | savings:</p><p class=\"printable-text\">printable | <a href=\"#\" class=\"disable-text\" data-ng-class=\"styles\">direct2card</a></p></div>";      }    ])    .directive("ssheader", ['$compile', '$parse',      function($compile, $parse) {        return {          restrict: "e",          scope: {            show: '=',            header: '=',            styles: '='          },          templateurl: 'common/header/ss_header.html',          compile: function compile(telement, tattrs, transclude) {              return function postlink(scope, element, attrs, controller) {              var headerelement = element.find('header');              scope.$watch(attrs.header, function(html) {                headerelement.html(html);                $compile(headerelement.contents())(scope);              });              headerelement.html(scope.header);              $compile(headerelement.contents())(scope);            };          }        }      }    ]);
.fleft {    float: left;  }  .fright {    float: right;  }  .coupons-text.fright {    float: right;  }  .disable-text.fleft {    float: left;  }
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>  <div ng-app="myapp" ng-controller="mycontroller">    <label>float right <input type="checkbox" ng-model="smallheader.fright" /></label>    <label>float left <input type="checkbox" ng-model="smallheader.fleft" /></label>        <ss-header styles="smallheader" show="showheader" header="headerhtml"></ss-header>      <script type="text/ng-template" id="common/header/ss_header.html">      <div>        <header data-ng-show="show" class="ss-header">        </header>        <!--normal div ng-class works-->        <div data-ng-class="styles">sample div show smallheader.floatitright works!!</div>      </div>    </script>  </div>

update: try explain use of compile function & $compile service if can. before go further state in directive written in snippet above we not make use of compile method, have used link method directly.

use $compile service when:

in general use $compile service compile html fragment contains directives , angular stuff against given scope make "alive". place compiled html need be. in case compile html fragment against host directive scope available in link method (see postlink function) put inside header element using jqlite.

use compile method when:

the compile method preferred on link method whenever need manipulate directive's template dynamically before wiring happens. before becomes "alive". example of if wanted change default template depending on urltemplate directive attribute <my-directive template-url="/apath/my-cutom-template.html">


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