AngularJS: Link function does not get evaluated attribute value -


i expect function step evaluated , result passed right link function. but, when link function called has nothing in $scope.name variable. $args.checkstep empty also. is design?

html

<!doctype html> <html ng-app="app" lang="en"> <head>     <meta charset="utf-8">     <meta http-equiv="x-ua-compatible" content="ie=edge">     <meta name="viewport" content="width=device-width, initial-scale=1">     <title>angularjs link function doesn not evaluated paramter</title>     <link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" /> </head> <body>  <br> <br>  <div class="container">     <custom-include src="inc/homepage.html" prefix="homepage" suffix="" tag="release"></custom-include> </div>  <script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.8/angular.min.js"></script> <script src="app.js" type="text/javascript"></script>  </body> </html>

js

(function () {      var app = angular.module('app', []);      app.directive('custominclude', function () {         return {             restrict: 'e',             scope: {                 type: '@'             },             link: function ($scope, $elem, $attr) {                 var prefix = $attr.prefix || '',                     suffix = $attr.suffix || '';                 $scope.step = function (s) {                     console.log('step', prefix, s, suffix);                     return prefix + s + suffix;                 };             },             template: function (elem, attr) {                 return ` <h2>fusce lorem ante</h2> <ul>     <li check-step="{{step(1)}}">vestibulum efficitur</li>     <li check-step="{{step(2)}}">arcu vitae iaculis sodales</li>     <li check-step="{{step(3)}}">ligula ex interdum neque</li>     <li check-step="{{step(4)}}">ac iaculis felis lectus in purus.</li> </ul> `;             }         };     });      app.directive('checkstep', function () {         return {             restrict: 'a',             scope: {                 name: '@checkstep'             },             link: function ($scope, $elem, $attr) {                 console.log('link', $scope.name);             }         };     });  })();

---- update ----

why did following code works:

<li check-step="{{1+step(1)}}">vestibulum efficitur</li>

but doesn'nt:

<li check-step="{{step(1)}}">vestibulum efficitur</li>

?

jsbin plunker

the attribute value computed , put on isolate scope after invocation of link function. use $watch see eventual value:

app.directive('checkstep', function () {     return {         restrict: 'a',         scope: {             name: '@checkstep'         },         link: function ($scope, $elem, $attr) {             //console.log('link', $scope.name);             //use $watch             $scope.$watch("name", function(newvalue) {                 console.log('link', newvalue);             });         }     }; });

the demo on plnkr


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