AngularJS指令隔离作用域和父作用域

Question

I'm trying to implement a recursive directive and it seems like to get it to work nicely I need to define an isolate scope as well as have access to the parent scope. Basically I want my directive to have access to variables set as attributes on the directive itself, but i also want to be able to access variables and methods set in the controller's scope. Is there a way to combine the two? I've tried with transclude but i suppose i'm not entirely sure if i've used it properly. Here is a fiddle example of my problem, where i'd like each 'child' in the directive to be able to call the function sayHi() : http://jsfiddle.net/n8dPm/655/

Answer 1

You have to pass the sayHi function to your directive. Directives create their own scope, So sayHi function is not part of your directive scope, the way to allow it is by creating a new prop an pass it.

HTML

<div ng-app="myapp">
    <div ng-controller="TreeCtrl">
        <tree family="treeFamily"
          say-hi="sayHi(name)"
         ngTransclude></tree>
    </div>
</div>

JS

var module = angular.module('myapp', []);

module.controller("TreeCtrl", function($scope) {
    $scope.treeFamily = {
        name : "Parent",
        children: [{
            name : "Child1",
            children: [{
                name : "Grandchild1",
                children: []
            },{
                name : "Grandchild2",
                children: []
            }]
        }, {
            name: "Child2",
            children: []
        }]
    };
    $scope.sayHi = function(name){
        alert(name+' says hello!')
    }
});

module.directive("tree", function($compile) {
    return {
        restrict: "E",
        scope: {
            family: '=',
          sayHi : '&'
         },
        transclude: true,
        template: 
            '<p>{{ family.name }}</p>'+
            '<ul>' + 
                '<li ng-repeat="child in family.children">' + 
                    '<tree family="child" say-hi="sayHi(name)"></tree>' +
                    '<button ng-click="sayHi({name : child.name})">Say Hi</button>' +
                '</li>' +
            '</ul>',
        compile: function(tElement, tAttr) {
            var contents = tElement.contents().remove();
            var compiledContents;
            return function(scope, iElement, iAttr) {
                if(!compiledContents) {
                    compiledContents = $compile(contents);
                }
                compiledContents(scope, function(clone, scope) {
                         iElement.append(clone); 
                });
            };
        }
    };
});