如何使用Angularjs检查模块中的指令或控制器是否可用

In angularjs, given a module, how do you check if a directive/controller exists given a module.

在angularjs中，给定一个模块，如何检查给定模块的指令/控制器是否存在。

I have a module and I want to know if some particular directives have been loaded. Below is some sample code:

我有一个模块，我想知道是否加载了一些特定的指令。下面是一些示例代码:

var module = angular.module('myModule');
//check if controller exists
if (module.hasController('my.first.controller')){
   //do something
}
if (module.hasDirective('my.first.directive')){
   //do something
}

I have implemented this in a way. Looking for a better way of doing it if it is available by default.

我以某种方式实现了这一点。寻找一种更好的方法，如果它是默认可用的。

Is this possible? If so, how do you do this?

这是可能的吗?如果是的话，你怎么做呢?

4 个解决方案

#1

Use this code to check if a service exists.

使用此代码检查服务是否存在。

$injector.has('myServiceName')

injector.has美元(“myServiceName”)

To check if a directive exists, you must add a Directive suffix after the directive name:

要检查指令是否存在，您必须在指令名之后添加一个指令后缀:

$injector.has('myDirectiveNameDirective')

injector.has美元(“myDirectiveNameDirective”)

#2

I found some working code here

我在这里找到了一些工作代码

angular.service('ControllerChecker', ['$controller', function($controller) {
    return {
        exists: function(controllerName) {
            if(typeof window[controllerName] == 'function') {
                return true;
            }
            try {
                $controller(controllerName);
                return true;
            } catch (error) {
                return !(error instanceof TypeError);
            }
        }
    };
}]);

JSFiddle: http://jsfiddle.net/fracz/HB7LU/6780/

JSFiddle:http://jsfiddle.net/fracz/HB7LU/6780/

#3

    var controllers = [];

    _.each(app._invokeQueue, function(value, index) {
        if (value[0] !== '$controllerProvider') {
            return;
        }

        controllers.push(value[2][0]);
    });

    if (controllers.indexOf('controller-i-want') === - 1) {
        // controller is undefined
    }

#4

-3

Solved the problem by writing a wrapper function that is called to load the controllers and stuff and at such I'm able to tell when each directive is loaded.

通过编写一个包装函数来加载控制器之类的东西来解决这个问题，这样我就可以知道何时加载每个指令。

#1