将值从指令传递给控制器

问题描述：

下面是我的html模板：

Below is my html template:

<div ng-app="dr" ng-controller="testCtrl">
    <test color1="color1" data-method="ctrlFn(msg)"></test>    
</div>

以下是我的代码：

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

app.controller("testCtrl", function($scope) {
    $scope.ctrlFn = function(arg) {        
        alert(arg);
    }

});
app.directive('test', function() {
    return {
        restrict: 'E',
        scope: {
            fromDirectiveFn: '&method'
        },
        link: function(scope, elm, attrs) {
            //Way One
            scope.hello = "some message";
            scope.fromDirectiveFn(scope.hello);
        }
    }
});

<div ng-app="dr" ng-controller="testCtrl">
    <test color1="color1" data-method="ctrlFn(msg)"></test>    
</div>

为什么我会未定义而非某些人消息

以下是小提琴
http： //jsfiddle.net/j2K7N/27/

答

您的代码几乎是正确的，但是您有几个问题这里：

Your code is almost correct, however you had several issues here:

<test color1="color1" data-method="ctrlFn(msg)"></test>

在这里传递 ctrlFn（）函数来自您的控制器，它带有一个未定义的参数 msg ，这会导致警报消息带有未定义文本。我建议将HTML代码修改为：

Here you pass the ctrlFn() function from your controller, which takes one undefined argument msg, that causes the alert message with "undefined" text. I suggest to modify the HTML code to this:

<test color1="color1" data-method="ctrlFn"></test>

请注意，我将 ctrlFn 作为变量，而不是函数。

Note that I pass the ctrlFn as a variable, not function.

在你的指令代码中，我将范围绑定更改为 = 以确保 ctrlFn 将指向您的控制器功能。这也在指令的作用域和控制器（父）作用域之间建立了双向绑定。然后该指令的整个JS代码将如下所示：

In your directive code, I changed the scope binding to = to make sure that the ctrlFn will point to your controller function. This also sets up a two-way binding between the directive's scope and the controller (parent) scope. Then the whole JS code of the directive will look like this:

app.directive('test', function() {
    return {
        restrict: 'E',
        scope: {
            fromDirectiveFn: '=method'
        },
        link: function(scope, elm, attrs) {
            //Way One
            scope.hello = "some message";
            scope.fromDirectiveFn(scope.hello);
        }
    }
});

只需将& 替换为 = 。工作分叉： http://jsfiddle.net/L8masomq/

Just replacing the & to =. Working fork: http://jsfiddle.net/L8masomq/

将值从指令传递给控制器

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