AngularJS自定义指令如何访问对象值？

Question

Here is my html code where i am calling directive

 <div  ng-repeat="feat in templateAttributes track by $index">
                <md-input-container flex="50"> 
                   <feat-directive feat="{{feat}}" />

                </md-input-container>

 </div> 

and below is custom directive code

sureApp.directive('featDirective', function () {
 alert("Hariom");
    return {

    restrict: 'E',
    template: '<span style="padding-right:20px"><label value="{{feat.Name}}">{{feat.Name}}</label></span>',
    link: function(scope, element, feat){

        if(feat.DataType === 'Boolean'){
            element.append('<input type="text" id="{{feat.Name}}" value="{{feat.Value}}" ng-model="feat.Value" />');
        }
        else if(feat.AllowedValues && feat.AllowedValues.length > 0){
            element.append('<select ng-model="feat.Value" ng-options="x for x in feat.AllowedValues.split(\',\')"></select>');
        }

        else if(feat.DataType == 'Integer'){
            element.append('<input type="text" id="{{feat.Name}}" value="{{feat.Value}}" ng-model="feat.Value" />');
        }
        else if(feat.DataType == 'String'){
            element.append('<input type="text" id="{{attr.feat.Name}}" value="{{attr.feat.Value}}" ng-model="attr.feat.Value" ng-minlength="attr.feat.MinLength" ng-maxlength="attr.feat.MaxLength" />');
        }
        else if(feat.DataType == 'IpAddress'){
            element.append('<input type="text" id="{{feat.Name}}" value="{{feat.Value}}" ng-model="feat.Value" />');
        }

  }
  };                

});

But when i am trying to get the value of feat.DataType i am getting undefined while I am getting below values when debugging the code.

$attr
:
Object
feat
:
"{"Name":"DisplayName","DataType":"String","Description":"Display Name","Mandatory":true,"Editable":true,"Extension":false,"MinLength":3,"MaxLength":100,"AllowedValues":"","Value":""}"
__proto__
:
Object

Then i change code little bit like this

  link: function(scope, element, attr) 

and tried used JSON parser

var feat1 = JSON.parse(attr.feat); 

After this change below code showing {{feat.Value}} in inputbox

<input type="text" id="{{feat.Name}}" value="{{feat.Value}}" ng-model="feat.Value" />

Answer 1

AngularJS directive creates it's own scope , you can access parent scope using scope isolation

AngularJS docs for directive

you can add scope property in return

return {
 restrict: 'E',
 scope: {
    feat: '=feat'
 }
 ...
}