AngularJS

Question

我有一个 AngularJS 指令，它使用 $http (ng.IHttpService) 从 api 调用数据没有问题。

我将 'click' 事件绑定到一个函数，并想在同一个 api 控制器上调用 POST 请求以将一些数据放入数据库中。

这是指令

import { Advert } from "../entities";

interface AdvertScope extends ng.IScope {
    advert: Advert;
}

export class AdvertDirective implements ng.IDirective {    
    restrict = 'EA';
    templateUrl = '/AngularViews/adverts.html';
    scope = {}

    constructor(private $http: ng.IHttpService) { }

    public link = (scope: AdvertScope, elem: JQuery, attributes: ng.IAttributes, ngModel: ng.INgModelController) => {
        this.$http.get<Advert>('/api/adverts/get-adverts')
            .then(response => {
                scope.advert = response.data;
            });

        elem.bind('click', function (e: any): void {
            var advertId = e.path[0].id;

            if (advertId != null && advertId != undefined) {
                var data = { advertId: advertId };

                // This is just a fire-and-forget post - no success/error handling   
                this.$http.post('/api/adverts/log-click', JSON.stringify(data));
            }
        });        
    }

    static factory(): ng.IDirectiveFactory {
        var directive = ($http: ng.IHttpService) => new AdvertDirective($http);
        directive.$inject = ['$http']
        return directive;
    }

}

问题是，当点击事件被点击时，错误：

Uncaught TypeError: Cannot read property 'post' of undefined

生成。

Answer 1

当你写'function''时，所以'this'指的是函数本身。您只需将 "function" 替换为 () =>{}，如下所示：

elem.bind('click',  (e: any): void=> {
    var advertId = e.path[0].id;

    if (advertId != null && advertId != undefined) {
        var data = { advertId: advertId };

        // This is just a fire-and-forget post - no success/error handling   
        this.$http.post('/api/adverts/log-click', JSON.stringify(data));
    }
});

AngularJS - 指令 - 调用 $http(POST) 的 onClick 函数 - $http 未定义？

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