angularjs - 使用 typescript 注入(inject)对 angularjs 指令的依赖

Question

假设我有一个简单的 Angular 指令，如下所示:

app.directive('setFocus', ['$timeout', function($timeout) {
return {
    restrict: 'AC',
    link: function(_scope, _element) {
        $timeout(function() {
            _element[0].focus();
        }, 0);
    }
};
}]);

我如何使用 Typescript 编写此代码并在链接函数中获取可访问的 $timeout？我的例子看起来像这样:

/// <reference path="../../reference.ts"/>

class SetFocus{
    constructor() {
        var directive: ng.IDirective = {};
        directive.restrict = 'EA';
        directive.scope = { };        
        directive.link= function ($scope, $element, $attrs) {
        // How can I access $timeout here?

        }
        return directive;
    }
}

directives.directive('setFocus', [SetFocus]);

这可能是一个愚蠢的例子，但这是我想要开始工作的原则，即在 Angular 链接函数中使用注入(inject)的依赖项。

Answer 1

试试这个方法:

class SetFocus implements ng.IDirective {
    //Directive settings
    restrict :string = 'EA';
    scope : any= {};
    //Take timeout argument in the constructor
    constructor(private $timeout: ng.ITimeoutService) {
    }

    link: ng.IDirectiveLinkFn = ($scope: ng.IScope, $element: ng.IAugmentedJQuery, $attrs: ng.IAttributes) => {
          //refer to the timeout
          this.$timeout(function() {
            $element[0].focus();
         }, 0);
    }
    //Expose a static func so that it can be used to register directive.
    static factory(): ng.IDirectiveFactory {
       //Create factory function which when invoked with dependencies by
       //angular will return newed up instance passing the timeout argument
        var directive: ng.IDirectiveFactory = 
              ($timeout:ng.ITimeoutService) => new SetFocus($timeout);
        //directive's injection list
        directive.$inject = ["$timeout"];
        return directive;
    }
}

directives.directive('setFocus', SetFocus.factory());

这可能是您现在使用它的方式有问题。因为指令工厂没有更新，所以它的构造函数将以 this 作为全局对象执行。这样，您最终也不会拥有庞大的构造函数，并且可以以适当的类ey 方式编写它。

如果您注入(inject)了许多依赖项而不是在工厂中重复参数，您也可以这样做:

  var directive: ng.IDirectiveFactory =
            (...args) => new (SetFocus.bind.apply(SetFocus, [null].concat(args)));