让我们说我有一个简单的角度指令,看起来像这样：
app.directive('setFocus',['$timeout',function($timeout) {
return {
restrict: 'AC',link: function(_scope,_element) {
$timeout(function() {
_element[0].focus();
},0);
}
};
}]);
如何使用Typescript编写它并在链接函数中获取$timeout访问？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]);
试试这种方式：
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());
这可能是你现在拥有它的方式的一个问题.因为指令工厂没有新建,所以它的构造函数将以此作为全局对象执行.这样你就不会有一个巨大的构造函数,并且可以用适当的类ey方式编写它.
如果您注入了许多依赖项而不是在工厂中重复参数,那么您也可以这样做：
var directive: ng.IDirectiveFactory =
(...args) => new (SetFocus.bind.apply(SetFocus,[null].concat(args)));
