Question

嘿伙计们我正在尝试从远程服务器获取数据并使用react-native

返回alertbox

这是我提取的代码

_onPressButtonPOST: function(){
    fetch("http://www.example.com/endpoint", {
    method: "POST",
    body: JSON.stringify({
      key: "value",
    })
  })
  .then((response) => response.json())
  .then((responseData) => {
    Alert.alert(
              "POST Response",
              "Response Body -> " + JSON.stringify(responseData.body)
          )
  })
  .done();
  },

这是我想从我的端点获取的内容。

{
  "_shards": {
    "total": 1,
    "successful": 1,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 1,
    "hits": [
      {
        "_index": "service",
        "_type": "service",
        "_id": "ac8c5edd-1aad-406f-b476-012c6e940c1a",
        "_score": 1,
        "_source": {
          "service_owner_id": "2",
          "service_name": "miamia",
          "service_email": "mk@gmail.com",
          "service_contact_name": "mukesh",
          "service_landline_number": "12345",
          "service_mobile_number": "1234567890",
          "service_address": "vdvml",
          "service_listingType": 1,
          "service_avg_rating": 3.5,
          "sarvice_ratingcount": 10,
          "service_serviceType": 1,
          "service_working_hour": [
            ""
          ],
          "service_subcat_ids": "2,3",
          "service_description": "hi I am mukesh kumar ",
          "service_id": "ac8c5edd-1aad-406f-b476-012c6e940c1a",
          "service_logo_url": "",
          "service_gallery_url": "",
          "service_location": {
            "lat": 19.34,
            "lon": 72.845
          },
          "service_subcategory": "CAT GER ",
          "service_review": []
        }
      }
    ]
  },
  "took": 2,
  "timed_out": false
}

但是在alertbox中它显示未定义可能是什么问题？任何人都可以帮忙吗？提前谢谢。

Answer 1

嘿，伙计们，我发现了这个错误并成功使用了API，感谢https://www.thepolyglotdeveloper.com/2015/09/make-http-requests-in-ios-with-react-native/ 我刚刚用responseData替换了responseData.body，因为我的服务器端代码中没有包含任何主体，所以它返回undefined

这是我的示例代码

.then((response) => response.json())
  .then((responseData) => {
    Alert.alert(
              "POST Response",
              "Response Body -> " + JSON.stringify(responseData)
          )
  })
  .done();

欢迎任何疑问和疑问。

Answer 2

通常另一个原因是，在PHP端点代码中，他们尝试使用$ _POST，$ _GET或$ _REQUEST来获取发送的参数。

在这种情况下，代替Json，在获取操作中使用FormData作为正文值。

一个例子

        var FormDataToPost = new FormData();
        FormDataToPost.append('userId', 12);

        fetch(url, { 
                method: 'POST',
                headers: {
                    'Accept': 'application/json',
                    'Content-Type': 'application/json' 
                    },
                body: FormDataToPost
            })
            .then((response) => response.json())
            .then((responseData) => { do something })
            .catch((error) => {
                    alert(error);
             })
            .done();

如何从react-native中的API获取数据

2 个答案: