typescript - 选择不正确

我正试着用打字机和杜兰德尔打交道。我试图让初学者示例使用Type Script，它适用于大多数方法和类。但是在下面的flickr类中，我在select方法中遇到了一个问题。调用此方法时，似乎这不是flickr类，而是选定的项。
有人能帮我弄清楚怎么回事吗？
其他方法如预期的那样工作。
谨致问候，
马尔维

///<reference path='../../Scripts/typings/requirejs/require.d.ts'/>
///<reference path='../../Scripts/typings/durandal/durandal.d.ts'/>
///<reference path='../../Scripts/typings/knockout/knockout.d.ts'/>

class Flickr
{
    app: App;
    http: Http;

    displayName = 'Flickr';
    images = ko.observableArray([]);

    constructor(app: App, http: Http)
    {
        this.app = app;
        this.http = http;
    }

    public activate() : any
    {
        //the router's activator calls this function and waits for it to complete before proceding
        if (this.images().length > 0)
        {
            return;
        }

        return this.http.jsonp('http://api.flickr.com/services/feeds/photos_public.gne', { tags: 'mount ranier', tagmode: 'any', format: 'json' }, 'jsoncallback').then((response)=>
        {
            this.images(response.items);
        });
    }
    public select(item : any) {
        //the app model allows easy display of modal dialogs by passing a view model
        //views are usually located by convention, but you an specify it as well with viewUrl
        item.viewUrl = 'views/detail';
        this.app.showModal(item);
    }
    public canDeactivate() : any
    {
        //the router's activator calls this function to see if it can leave the screen
        return this.app.showMessage('Are you sure you want to leave this page?', 'Navigate', ['Yes', 'No']);
    }
}

define(['durandal/http', 'durandal/app'], function (http, app)
{
    return new Flickr(app, http);
} );

编译成以下JavaScript：

var Flickr = (function () {
    function Flickr(app, http) {
        this.displayName = 'Flickr';
        this.images = ko.observableArray([]);
        this.app = app;
        this.http = http;
    }
    Flickr.prototype.activate = function () {
        var _this = this;
        if(this.images().length > 0) {
            return;
        }
        return this.http.jsonp('http://api.flickr.com/services/feeds/photos_public.gne', {
            tags: 'mount ranier',
            tagmode: 'any',
            format: 'json'
        }, 'jsoncallback').then(function (response) {
            _this.images(response.items);
        });
    };
    Flickr.prototype.select = function (item) {
        item.viewUrl = 'views/detail';
        this.app.showModal(item);
    };
    Flickr.prototype.canDeactivate = function () {
        return this.app.showMessage('Are you sure you want to leave this page?', 'Navigate', [
            'Yes',
            'No'
        ]);
    };
    return Flickr;
})();
define([
    'durandal/http',
    'durandal/app'
], function (http, app) {
    return new Flickr(app, http);
});
//@ sourceMappingURL=flickr.js.map

最佳答案

要使“this”引用视图模型，可以执行以下操作（假设flickr.html视图未被更改）：
更改标记的缩略图上的单击绑定

<a href="#" class="thumbnail" data-bind="click:$parent.select">

到

<a href="#" class="thumbnail" data-bind="click: function (item) { $parent.select(item); }">

因为您正在直接调用$parent对象（视图模型）上的select方法，所以视图模型将绑定到“this”。

关于typescript - 选择不正确，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/15597620/