如何检查 Angular 1.5 中是否存在组件 [英] How to check if a component exists in Angular 1.5

问题描述

http://embed.plnkr.co/oGlcQSOM2vFcDEKP7thV/

$injector.has('myMessageDirective') 返回 true，而 $injector.has('myMessageComponent') 不

$injector.has('myMessageDirective') returns true, while $injector.has('myMessageComponent') does not

是否有人为此苦苦挣扎或有解决方案?我担心"的是，由于指令检查，我的组件可能在未来的更新中找不到.

Is anyone struggling with this or has a solution? My "fear" is that my components might not be found in future updates because of the directive check.

跟进问题:检查 Angular 指令是否存在

推荐答案

归根结底，组件注册为指令，因此确实需要'Directive'后缀.

At the end of the day, a component is registered as a directive, so 'Directive' suffix is indeed needed.

检查$injector对象的'has'方法:

Check 'has' method of $injector object:

return {
  invoke: invoke,
  instantiate: instantiate,
  get: getService,
  annotate: createInjector.$$annotate,
  has: function(name) {
    return providerCache.hasOwnProperty(name + providerSuffix) || cache.hasOwnProperty(name);
  }
};

您可以调试它并看到所有组件(在缓存对象内)都注册为指令.没有组件"后缀.

You can debug it and see that all components (inside cache object) are registered as directives. There is no 'Component' suffix.

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