// https://github.com/ElemeFE/element/blob/dev/packages/upload/src/ajax.js
|
|
function getError(action, option, xhr) {
|
const msg = `fail to post ${action} ${xhr.status}'`;
|
const err = new Error(msg);
|
err.status = xhr.status;
|
err.method = 'post';
|
err.url = action;
|
return err;
|
}
|
|
function getBody(xhr) {
|
const text = xhr.responseText || xhr.response;
|
if (!text) {
|
return text;
|
}
|
|
try {
|
return JSON.parse(text);
|
} catch (e) {
|
return text;
|
}
|
}
|
|
export default function upload(option) {
|
if (typeof XMLHttpRequest === 'undefined') {
|
return;
|
}
|
|
const xhr = new XMLHttpRequest();
|
const action = option.action;
|
|
if (xhr.upload) {
|
xhr.upload.onprogress = function progress(e) {
|
if (e.total > 0) {
|
e.percent = e.loaded / e.total * 100;
|
}
|
option.onProgress(e);
|
};
|
}
|
|
const formData = new FormData();
|
|
if (option.data) {
|
Object.keys(option.data).map(key => {
|
formData.append(key, option.data[key]);
|
});
|
}
|
|
formData.append(option.filename, option.file);
|
|
xhr.onerror = function error(e) {
|
option.onError(e);
|
};
|
|
xhr.onload = function onload() {
|
if (xhr.status < 200 || xhr.status >= 300) {
|
return option.onError(getError(action, option, xhr), getBody(xhr));
|
}
|
|
option.onSuccess(getBody(xhr));
|
};
|
|
xhr.open('post', action, true);
|
|
if (option.withCredentials && 'withCredentials' in xhr) {
|
xhr.withCredentials = true;
|
}
|
|
const headers = option.headers || {};
|
|
// if (headers['X-Requested-With'] !== null) {
|
// xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
|
// }
|
|
for (let item in headers) {
|
if (headers.hasOwnProperty(item) && headers[item] !== null) {
|
xhr.setRequestHeader(item, headers[item]);
|
}
|
}
|
xhr.send(formData);
|
}
|
