javascript 如果 responseType 是 arraybuffer，如何从 $http 读取 JSON 错误响应
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How to read JSON error response from $http if responseType is arraybuffer
提问by hansmaad
I load some binary data using
我使用加载一些二进制数据
$http.post(url, data, { responseType: "arraybuffer" }).success(
function (data) { /* */ });
In case of an error, the server responds with an error JSON object like
如果出现错误，服务器会响应一个错误 JSON 对象，例如
{ "message" : "something went wrong!" }
Is there any way to get the error response in a different type than a success response?
有什么方法可以获得与成功响应不同类型的错误响应？
$http.post(url, data, { responseType: "arraybuffer" })
.success(function (data) { /* */ })
.error(function (data) { /* how to access data.message ??? */ })
回答by smkanadl
Edit: As @Paul LeBeau points out, my answer assumes that the response is ASCII encoded.
编辑：正如@Paul LeBeau 指出的那样，我的回答假设响应是 ASCII 编码的。
Basically you just need to decode the ArrayBuffer into a string and use JSON.parse().
基本上你只需要将 ArrayBuffer 解码成一个字符串并使用 JSON.parse()。
var decodedString = String.fromCharCode.apply(null, new Uint8Array(data));
var obj = JSON.parse(decodedString);
var message = obj['message'];
I ran tests in IE11 & Chrome and this works just fine.
我在 IE11 和 Chrome 中进行了测试，效果很好。
回答by Paul LeBeau
@smkanadl's answer assumes that the response is ASCII. If your response is in another encoding, then that won't work.
@smkanadl 的回答假定响应是 ASCII。如果您的响应采用另一种编码，那么这将不起作用。
Modern browsers (eg. FF and Chrome, but not IE yet) now support the TextDecoderinterface that allows you to decode a string from an ArrayBuffer(via a DataView).
现代浏览器（例如 FF 和 Chrome，但尚不支持 IE）现在支持TextDecoder允许您从ArrayBuffer（通过 a DataView）解码字符串的接口。
if ('TextDecoder' in window) {
// Decode as UTF-8
var dataView = new DataView(data);
var decoder = new TextDecoder('utf8');
var response = JSON.parse(decoder.decode(dataView));
} else {
// Fallback decode as ASCII
var decodedString = String.fromCharCode.apply(null, new Uint8Array(data));
var response = JSON.parse(decodedString);
}
回答by Adeel Imran
Suppose in your service, you have a function you are using like, This is for Angular 2
假设在您的服务中，您有一个正在使用的功能，例如，这是用于 Angular 2
someFunc (params) {
let url = 'YOUR API LINK';
let headers = new Headers();
headers.append('Content-Type', 'application/json');
headers.append('Authorization','Bearer ******');
return this._http
.post(url, JSON.stringify(body), { headers: headers})
.map(res => res.json());
}
Make sure when you return it it is res.json() and not res.json. Hope it helps, to anyone having this issue
确保返回时它是 res.json() 而不是 res.json。希望对遇到此问题的人有所帮助
