javascript - What are the advantages/disadvantages to a declarative template? ViewModel approach? -


when talking declarative syntax in angularjs bring directives, , how can pass $scope properties down these directives processing, dom manipulation, data gathering , maybe various combination of those.

currently, i'm struggling convince team (let alone myself) declarative template right approach. doesn't mean using directives, how use directives.

the following controller/template pair shows example display element based on "model"/$scope's properties.

function maincontroller($scope) {     $scope.hasjquery = true;      $scope.hasproblems = true;      $scope.haslodash = false;      $scope.hasstuff = true; }  <div ng-controller="maincontroller">     <span ng-if="hasjquery && hasproblems && haslodash && hasstuff">tl;dr?</span> <div>

but other approach may this

function maincontroller2($scope) {     // get/retrieve $scope stuff...      // setup "viewmodel" data     $scope.hasjqueryandproblemsandlodashandstuff = $scope.hasjquery && $scope.hasproblems && $scope.haslodash && $scope.hasstuff;      $scope.hasjqueryandlodash = $scope.hasjquery && $scope.haslodash; }  <div ng-controller="maincontroller">     <span ng-if="hasjqueryandproblemsandlodashandstuff">...</span>     <span ng-class="hasjqueryandlodash ? 'blue' : ''"></span> </div>

the name exaggerated version of possibly such isready or hasall point show html require multiple ng-class attributes various logic rely on $scope properties.

i see first example being people go - except in cases logic gets complex. plus know angularjs mvw doesn't me out.

should add "viewmodel" (presentation logic) $scope in controller sometimes? time? never? , advantages/disadvantages of putting presentation logic controller/template?


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