How to access wrapped variables in a directive? - angularjs

Question

I have an object which consists of multiple arrays:
$scope.myArrays = {
array1: ['Pizza', 'Spaghetti'],
array2: ['Lasagne', 'Schnitzel']
};
Moreover, I have a custom directive to which I want to pass this object myArrays and bind those arrays to scope variables:
<my-directive my-data="myArrays"></my-directive>
myApp.directive('myDirective', function() {
return {
restrict: 'E',
scope: {
arrayOne: '=myData.array1',
arrayTwo: '=myData.array2'
},
link: function(scope, elem) {
// get access to scope.array1 and scope.array2
}
};
});
All together in a fiddle for you to play around!
Is there a way to bind the arrays directly or do I need to bind arrays: '=myArrays' and access them like arrays.array1?

Answer 1

Binding has to be one to one, you cannot do that. Yes, you will have to access the arrays inside your directive.
myApp.directive('myDirective', function() {
return {
restrict: 'E',
scope: {
myData: '='
},
link: function(scope, elem) {
scope.arrayOne = scope.myData.array1;
scope.arrayTwo = scope.myData.array2;
}
};
});
You can directly access scope.myData.array1 and scope.myDate.array2 inside the directive template if you dont have to process these arrays in the link function and get rid of it.

Answer 2

You could do this by just assigning them to scope fields:
myApp.directive('myDirective', function() {
return {
restrict: 'E',
scope: {
myData: '='
},
link: function(scope, elem) {
scope.arrayOne = myData.array1;
scope.arrayTwo = myData.array2;
}
};
});
However, I would recommeend to just bind the object and to get rid of the link-function. That way the directives code is a lot shorter, more readable, less "black magic" happens and the references inside the directive are more expressive:
myApp.directive('myDirective', function() {
return {
restrict: 'E',
scope: {
myData: '='
}
};
});
Then you can just reference it inside the directive with myData.array1. Replace the '=' with '=someName' to reference it with someName.array1

Answer 3

your HTML should be :
<my-directive arrayone="myData.array1" arraytwo="myData.array2"></my-directive>
and your directive :
myApp.directive('myDirective', function() {
return {
restrict: 'E',
scope: {
arrayOne: '=arrayone',
arrayTwo: '=arraytwo'
},
link:function(scope){
console.log('arrayOne :',scope.arrayOne);
console.log('arrayTwo :',scope.arrayTwo);
},
controller: function($scope) {
console.log('arrayOne :',$scope.arrayOne);
console.log('arrayTwo :',$scope.arrayTwo);
}
};
});

Answer 4

Demo
HTML-Partial:
<div ng-controller="MyCtrl">
<my-directive my-data="myArrays" array-one="myArrays.array1" array-two="myArrays.array2">
</my-directive>
</div>
Script:
angular.module('myApp', [])
.directive('myDirective', function() {
return {
restrict: 'E',
scope: {
arrayOne: '=',
arrayTwo: '='
},
link: function(scope, elem) {
// get access to scope.array1 and scope.array2
//console.log(scope.array1)
console.log(scope.arrayOne);
console.log(scope.arrayTwo);
}
};
})
.controller('MyCtrl', function($scope) {
$scope.myArrays = {
array1: ['Pizza', 'Spaghetti'],
array2: ['Lasagne', 'Schnitzel']
};
});