将值从指令传递给控制器 [英] Passing values from directive to controller

问题描述

以下是我的 html 模板:

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

下面是我的代码:

var app = angular.module('dr', []);app.controller("testCtrl", function($scope) {$scope.ctrlFn = 函数(参数){警报(参数)；}});app.directive('test', function() {返回 {限制:'E'，范围: {fromDirectiveFn: '&method'},链接:函数(范围，榆树，属性){//方式一scope.hello = "一些消息";scope.fromDirectiveFn(scope.hello);}}});<div ng-app="dr" ng-controller="testCtrl"><test color1="color1" data-method="ctrlFn(msg)"></test>

为什么我收到未定义"而不是一些消息"

下面是一个小提琴http://jsfiddle.net/j2K7N/27/

解决方案

您的代码几乎是正确的，但是您在这里遇到了几个问题:

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

在这里，您从控制器传递 ctrlFn() 函数，该函数接受一个未定义的参数 msg，这会导致带有未定义"文本的警报消息.我建议将 HTML 代码修改为:

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

请注意，我将 ctrlFn 作为变量而不是函数传递.

在您的指令代码中，我将范围绑定更改为 = 以确保 ctrlFn 将指向您的控制器函数.这也在指令的范围和控制器(父)范围之间建立了双向绑定.那么指令的整个 JS 代码将如下所示:

app.directive('test', function() {返回 {限制:'E'，范围: {fromDirectiveFn: '=method'},链接:函数(范围，榆树，属性){//方式一scope.hello = "一些消息";scope.fromDirectiveFn(scope.hello);}}});

只需将 & 替换为 =.工作叉:http://jsfiddle.net/L8masomq/

Below is my html template:

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

Below is my code:

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>

Why am i getting "undefined" instead of "some message"

Below is a fiddle http://jsfiddle.net/j2K7N/27/

解决方案

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

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

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>  

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

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);
        }
    }
});

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

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