AngularJS : Initializing isolated scope inside a directive -


i have created directive accepts attributes , initializes isolated scope these attributes. if attribute isn't specified, isolated scope should initialized calculated value.

i added link function inspects scope , initializes default values (if no value has been set using attributes). scope has been initialized, if set default value overwritten later framework.

a workaround use $timeout(...) , set afterwards, seems of hack.

function ($timeout) {   return {     scope: { msg1: '@', msg2: '@' },     template: '<div>{{msg1}} {{msg2}} {{msg3}}</div>',     link: function ($scope, $elt, $attr) {       var action = function() {         if (!$scope.msg2) $scope.msg1 = 'msg1';         if (!$scope.msg2) $scope.msg2 = 'msg2';         if (!$scope.msg3) $scope.msg3 = 'msg3';                       };       action();       //$timeout(action, 0);     }   }; });

i have prepared jsfiddle illustrate happening.

  • msg1 initialized via attribute , has correct value @ times.
  • msg2 not initialized via attribute, can set using attribute. value overwritten after link method has been called.
  • msg3 not initialized via attribute, , isn't possible. value set when constructing controller , works fine.

it seems angularjs creates scope , updates value after controller created , directive linked dom. can tell me recommended way this?

you have operate on attributes if want set defaults '@' type binding. read $compile

you can in compile function:

compile: function(element, attrs) {     if (!attrs.msg1) attrs.msg1 = 'msg1';     if (!attrs.msg2) attrs.msg2 = 'msg2'; }

http://jsfiddle.net/5kuqs/9/

or can use link function well.

link: function ($scope, $elt, attrs) {     var action = function() {         console.log('msg1:' + $scope.msg1 + ', msg2:' + $scope.msg2 + ', msg3: ' + $scope.msg3);         if (!attrs.msg1) attrs.msg1 = 'msg1';         if (!attrs.msg2) attrs.msg2 = 'msg2';         if (!attrs.msg3) attrs.msg3 = 'msg3';                     };     action(); }

http://jsfiddle.net/5kuqs/13/

the reason there binding attribute setup overrides changes scope variable. need modify attribute value being taken from.

@ or @attr - bind local scope property value of dom attribute. result string since dom attributes strings


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