聚合物铁-ajax POST 方法无效

Question

我正在学习 Polymer。我无法使用 <iron-ajax> 计算 "post" 的代码。我正在使用在线测试 API (https://reqres.in/)，我应该会收到状态代码为 200 的回复：

{"token": "QpwL5tke4Pnpja7X"}".

我找不到显示 POST 示例的教程。过去 24 小时我一直在网上搜索，但所有内容都是关于 GET 而不是 POST.

如果熟悉 <iron-ajax> 的人可以查看我的代码并帮助我让它工作或弄清楚如何编写正确的代码，这对像我这样的初学者会很有帮助。

我的代码是否符合 body 属性？

响应是200状态码还是令牌？

<!--
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The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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Code distributed by Google as part of the polymer project is also
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<link rel="import" href="../bower_components/polymer/polymer-element.html">
<link rel="import" href="shared-styles.html">
<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="../bower_components/iron-ajax/iron-ajax.html">

<dom-module id="my-view2">
  <!--test using this data: {
      "email": "peter@klaven",
      "password": "cityslicka"
  }-->
  <template>
    <iron-ajax>
        auto 
        method="post"
        url="https://reqres.in/api/login"
        handle-as="json"
        content-type="application/json"
        body =[{"email": "peter@klaven", "password": "cityslicka"}]
        on-response={{handleResponse}}

    </iron-ajax>

    <!--Handle response-->
    <p> response handling code goes here, how to show the response from the server here?</p>
    <p> It should show: {"token": "QpwL5tke4Pnpja7X"} </p>
    <div>
    <p> {{handleResponse}} </p>
    </div>
  </template>

  <script>
    class MyView2 extends Polymer.Element {
      static get is() { return 'my-view2'}; 

      static get proporties() {
        return {
          handleResponse: {
            type: Object,
            notify: true,
            readOnly: true 
          }
        };
      }
    }

    window.customElements.define(MyView2.is, MyView2);
  </script>
</dom-module>

Answer 1

您的 HTML 格式错误（可能是复制粘贴拼写错误？）。 iron-ajax 的属性应该像这样位于开始标记内：
```
<iron-ajax
  auto
  method="post"
  ...
>
</iron-ajax>
```
您可能打算将 handleResponse 属性绑定到 <iron-ajax>.lastResponse，其中包含对 AJAX 请求的响应。
```
<iron-ajax last-response={{handleResponse}} ...>
```
请注意，<p>{{handleResponse}}</p> 的绑定会将响应对象呈现为 [object Object]。如果你想看到响应内容，你必须使用 computed binding that returns a string (e.g., with JSON.stringify()) 像这样：
```
// <template>
<p>json(handleResponse)</p>

// <script>
class XFoo extends Polymer.Element {
  ...
  json(obj) {
    return JSON.stringify(obj);
  }
}
```
<iron-ajax>.body的属性值应该像这样单引号：
```
<iron-ajax body='[{"foo": "bar"}]'>
```

完整示例应如下所示：

<dom-module id="x-foo">
  <template>
    <iron-ajax
              auto
              method="post"
              url="//httpbin.org/post"
              body='[{"foo": "{{foo}}"}]'
              handle-as="json"
              content-type="application/json"
              last-response="{{lastResponse}}"
              >
    </iron-ajax>
    <pre>[[json(lastResponse)]]</pre>
  </template>
  <script>
    class XFoo extends Polymer.Element {
      static get is() { return 'x-foo'; }

      static get properties() {
        return {
          foo: {
            type: String,
            value: 'bar'
          }
        }
      }

      json(obj) {
        return JSON.stringify(obj, null, 2);
      }
    }
    customElements.define(XFoo.is, XFoo);
  </script>
</dom-module>

demo

聚合物铁-ajax POST 方法无效

Polymer iron-ajax POST method not working

polymer

polymer-2.x

iron-ajax