javascript 如何使用 Angularjs 检查模块中的指令或控制器是否可用
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How to check if a directive or controller is available in a module using Angularjs
提问by ritcoder
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，我想知道是否已加载某些特定指令。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.
我已经以某种方式实现了这一点。如果默认情况下可用，则寻找更好的方法。
Is this possible? If so, how do you do this?
这可能吗？如果是这样，你怎么做？
回答by Pian0_M4n
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('myServiceName')
To check if a directive exists, you must add a Directivesuffix after the directive name:
要检查指令是否存在，您必须Directive在指令名称后添加后缀：
$injector.has('myDirectiveNameDirective')
$injector.has('myDirectiveNameDirective')
回答by jlewkovich
I found some working code here
我在这里找到了一些工作代码
angular.service('ControllerChecker', ['$controller', function($controller) {
return {
exists: function(controllerName) {
if(typeof window[controllerName] == 'function') {
return true;
}
try {
$controller(controllerName);
return true;
} catch (error) {
return !(error instanceof TypeError);
}
}
};
}]);
JSFiddle: http://jsfiddle.net/fracz/HB7LU/6780/
JSFiddle：http: //jsfiddle.net/fracz/HB7LU/6780/
回答by sgarbesi
var controllers = [];
_.each(app._invokeQueue, function(value, index) {
if (value[0] !== '$controllerProvider') {
return;
}
controllers.push(value[2][0]);
});
if (controllers.indexOf('controller-i-want') === - 1) {
// controller is undefined
}
回答by ritcoder
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解决这个问题，该函数被调用来加载控制器和东西，这样我就可以知道每个指令何时加载。
