承诺与铁阿贾克斯的回应

Question

我怎么能写出一个响应来自铁阿贾克斯的承诺.

<iron-ajax id="listItems" method="GET" content-type="application/json" handle-as="json" last-response="{{items}}" on-error="handleErrorResponse"></iron-ajax>

this.data =  {
    get: function(sort, page, pageSize) {
            return new Promise(function(resolve, reject) {
                // Execute iron-ajax.
                //...
                // resolve(iron-ajax's response);
            });
        }
    }
};

Answer 1

你正在寻找listItem.generateRequest(),因为它返回了铁-ajax伴随的铁请求对象,而这反过来提供了一个名为的承诺request.completes.

https://www.webcomponents.org/element/PolymerElements/iron-ajax/iron-ajax#method-generateRequest

https://www.webcomponents.org/element/PolymerElements/iron-ajax/iron-request#property-completes

我修改了下面的代码示例:

<iron-ajax id="listItems" method="GET" content-type="application/json" handle-as="json" last-response="{{items}}" on-error="handleErrorResponse"></iron-ajax>

this.data =  {
    get: function(sort, page, pageSize) {
            return this.$.listItems.generateRequest().completes;
        }
    }
};

受到/sf/answers/2659682371/上更复杂的例子的启发.感谢@akivajgordon.