vue-uiv/src/utils/httpUtils.js

Bootstrap 3 components implemented by Vue 2.

import {isFunction, isExist} from './objectUtils'

export function getRequest (url) {
  let request = new window.XMLHttpRequest()
  let data = {}
  let p = {
    then: (fn1, fn2) => p.done(fn1).fail(fn2),
    catch: (fn) => p.fail(fn),
    always: (fn) => p.done(fn).fail(fn)
  }
  let statuses = ['done', 'fail']
  statuses.forEach(name => {
    data[name] = []
    p[name] = (fn) => {
      if (fn instanceof Function) data[name].push(fn)
      return p
    }
  })
  p.done(JSON.parse)
  request.onreadystatechange = () => {
    if (request.readyState === 4) {
      let e = {status: request.status}
      if (request.status === 200) {
        let response = request.responseText
        for (let i in data.done) {
          if (data.done.hasOwnProperty(i) && isFunction(data.done[i])) {
            let value = data.done[i](response)
            if (isExist(value)) {
              response = value
            }
          }
        }
      } else {
        data.fail.forEach(fail => fail(e))
      }
    }
  }
  request.open('GET', url)
  request.setRequestHeader('Accept', 'application/json')
  request.send()
  return p
}