495 lines
13 KiB
JavaScript
495 lines
13 KiB
JavaScript
/**
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* Request组件, modern版, 支持IE9+,chrome,FF
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* @authors yutent (yutent@doui.cc)
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* @date 2016-11-27 13:08:40
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*
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*/
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'use strict'
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import 'promise/index'
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import Format from './lib/format'
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var _request = function(url, protocol) {
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this.transport = true
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protocol = (protocol + '').trim().toUpperCase()
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this.xhr = Xhr()
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this.defer = Promise.defer()
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this.opt = {
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url: (url + '').trim(),
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type: protocol || 'GET',
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form: '',
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data: {},
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headers: {},
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timeoutID: 0,
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uuid: Math.random()
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.toString(16)
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.substr(2)
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}
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},
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_requestp = _request.prototype,
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toS = Object.prototype.toString,
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win = window,
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doc = win.document,
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encode = encodeURIComponent,
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decode = decodeURIComponent,
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noop = function(e, res) {
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this.defer.resolve(res)
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}
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// -----------------------------
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// 本地协议判断正则
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var rlocalProtocol = /^(?:about|app|app-storage|.+-extension|file|res|widget):$/
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var isLocal = false
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try {
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isLocal = rlocalProtocol.test(location.ptyperotocol)
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} catch (e) {}
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var rheaders = /^(.*?):[ \t]*([^\r\n]*)\r?$/gm
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// ----------------- 一些兼容性预处理 --------------------
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win.Xhr = function() {
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return new XMLHttpRequest()
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}
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var supportCors = 'withCredentials' in Xhr()
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// ---------------------------------------------------------
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// -------------------- request 模块开始 --------------------
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// ---------------------------------------------------------
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var requestConvert = {
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text: function(val) {
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return val
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},
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xml: function(val, xml) {
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return xml !== undefined ? xml : Format.parseXML(val)
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},
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html: function(val) {
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return Format.parseHTML(val)
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},
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json: function(val) {
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return JSON.parse(val)
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},
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script: function(val) {
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return Format.parseJS(val)
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},
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jsonp: function(name) {
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var json = request.cache[name]
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delete request.cache[name]
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return json
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}
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}
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var requestExtend = {
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formData: function() {
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if (this.opt.form) {
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var data = Format.parseForm(this.opt.form)
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Format.merge(this.opt.data, data)
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}
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var form = new FormData()
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for (var i in this.opt.data) {
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var el = this.opt.data[i]
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if (Array.isArray(el)) {
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el.forEach(function(it) {
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form.append(i + '[]', it)
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})
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} else {
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form.append(i, this.opt.data[i])
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}
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}
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return form
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},
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jsonp: function(jsonpcallback) {
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win[jsonpcallback] = function(val) {
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delete win[jsonpcallback]
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request.cache[jsonpcallback] = val
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}
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},
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dispatch: function(self) {
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if (!this.transport) return this.defer.reject('Request pending...')
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var _this = this,
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result = {
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response: {
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url: this.opt.url,
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headers: { 'content-type': '' }
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},
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request: {
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url: this.opt.url,
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headers: _this.opt.headers
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},
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status: self === null ? 504 : 200,
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statusText: self === null ? 'Connected timeout' : 'ok',
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text: '',
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body: '',
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error: null
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}
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//状态为4,既已成功, 则清除超时
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clearTimeout(_this.opt.timeoutID)
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if (typeof this.transport === 'object' && this.opt.type === 'JSONP') {
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//移除script
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// this.transport.parentNode.removeChild(this.transport);
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//超时返回
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if (self !== null) {
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var exec =
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!this.transport.readyState ||
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this.transport.readyState === 'loaded' ||
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this.transport.readyState === 'complete'
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if (exec) {
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result.body = requestConvert.jsonp(this.opt.data.callback)
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result.text = JSON.stringify(result.body)
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}
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}
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this.callback(result.error, result)
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} else {
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//成功的回调
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var isSucc = self
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? (self.status >= 200 && self.status < 300) || self.status === 304
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: false,
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headers = (self && self.getAllResponseHeaders().split('\n')) || []
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//处理返回的Header
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headers.forEach(function(it, i) {
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it = it.trim()
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if (it) {
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it = it.split(':')
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result.response.headers[it.shift().toLowerCase()] = it
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.join(':')
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.trim()
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}
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})
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if (isSucc) {
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result.status = self.status
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if (result.status === 204) {
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result.statusText = 'no content'
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} else if (result.status === 304) {
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result.statusText = 'not modified'
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}
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} else {
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result.status = self === null ? 504 : self.status || 500
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result.statusText =
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self === null
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? 'Connected timeout'
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: self.statusText || 'Internal Server Error'
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result.error = Format.merge(new Error(result.statusText), {
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status: result.status
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})
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}
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try {
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//处理返回的数据
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var dataType = result.response.headers['content-type'].match(
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/json|xml|script|html/i
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) || ['text']
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dataType = dataType[0].toLowerCase()
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result.text = (self && (self.responseText || self.responseXML)) || ''
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result.body = requestConvert[dataType](
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result.text,
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self && self.responseXML
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)
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} catch (err) {
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result.error = err
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result.statusText = 'parse error'
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}
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_this.callback(result.error, result)
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}
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delete _this.defer
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delete _this.transport
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delete _this.opt
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delete _this.xhr
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}
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}
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// 设置表单类型, 支持2种, form/json
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_requestp.type = function(t) {
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if (this.opt.formType === 'form-data') return this
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this.opt.formType = t || 'form'
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if (t === 'form' || this.opt.type === 'GET')
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this.set('content-type', 'application/x-www-form-urlencoded; charset=UTF-8')
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else this.set('content-type', 'application/json; charset=UTF-8')
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return this
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}
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//设置头信息
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_requestp.set = function(k, val) {
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if (!this.transport) return
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if (typeof k === 'object') {
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for (var i in k) {
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i = i.toLowerCase()
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this.opt.headers[i] = k[i]
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}
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} else if (typeof k === 'string') {
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if (arguments.length < 2) throw new Error('2 arguments required')
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// 全转小写,避免重复写入
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k = k.toLowerCase()
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if (val === undefined) delete this.opt.headers[k]
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else this.opt.headers[k] = val
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} else {
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throw new Error(
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'arguments must be string/object, but [' + typeof k + '] given'
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)
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}
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return this
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}
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//设置请求参数
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_requestp.send = function(k, val) {
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if (!this.transport) return
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// 1. send方法可以多次调用, 但必须保证格式一致
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// 2. 2次圴提交纯字符串也会抛出异常
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if (typeof k === 'object') {
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if (this.opt.data && typeof this.opt.data === 'string')
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throw new Error('param can not be string and object at the same time')
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if (!this.opt.data) this.opt.data = {}
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Format.merge(this.opt.data, k)
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} else {
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if (typeof k === 'string') {
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if (arguments.length === 1) {
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if (this.opt.data) throw new Error('invalid param in function send')
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this.opt.data = k
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} else {
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if (this.opt.data && typeof this.opt.data === 'string')
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throw new Error('param can not be string and object at the same time')
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if (!this.opt.data) this.opt.data = {}
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this.opt.data[k] = val
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}
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} else {
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throw new Error(
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'argument of send must be string/object, but [' + typeof k + '] given'
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)
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}
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}
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return this
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}
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//该方法用于 form-data类型的post请求的参数设置
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_requestp.field = function(k, val) {
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if (!this.transport) return this
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// 此类型优先级最高
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this.opt.formType = 'form-data'
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this.opt.type = 'POST'
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if (!this.opt.data || (this.opt.data && typeof this.opt.data !== 'object'))
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this.opt.data = {}
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if (arguments.length === 1 && typeof k === 'object') {
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Format.merge(this.opt.data, k)
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} else if (arguments.length === 2) {
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this.opt.data[k] = val
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} else {
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throw new TypeError(
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'argument must be an object, but ' + typeof k + ' given'
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)
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}
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return this
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}
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//设置缓存
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_requestp.cache = function(t) {
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if (!this.transport) return
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if (this.opt.type === 'GET') this.opt.cache = !!t
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return this
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}
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//取消网络请求
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_requestp.abort = function() {
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delete this.transport
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if (!this.opt.form) this.xhr.abort()
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return this
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}
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//超时设置, 单位毫秒
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_requestp.timeout = function(time) {
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if (typeof time !== 'number' || time < 1) return this
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this.opt.timeout = time
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return this
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}
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_requestp.form = function(form) {
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if (typeof form === 'object' && form.nodeName === 'FORM') {
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this.opt.type = 'POST'
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this.opt.form = form
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}
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return this
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}
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var originAnchor = doc.createElement('a')
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originAnchor.href = location.href
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_requestp.end = function(callback) {
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var _this = this
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// 回调已执行, 或已取消, 则直接返回, 防止重复执行
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if (!this.transport) return this
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if (!this.opt.url) throw new Error('Invalid request url')
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Format.merge(this, requestExtend)
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this.callback = callback || noop.bind(this)
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// 1. url规范化
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this.opt.url = this.opt.url
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.replace(/#.*$/, '')
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.replace(/^\/\//, location.protocol + '//')
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// 2. 处理跨域
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if (typeof this.opt.crossDomain !== 'boolean') {
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var anchor = doc.createElement('a')
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try {
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anchor.href = this.opt.url
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// IE7及以下浏览器 '1'[0]的结果是 undefined
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// IE7下需要获取绝对路径
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var absUrl = !'1'[0] ? anchor.getAttribute('href', 4) : anchor.href
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anchor.href = absUrl
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anchor.async = true
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this.opt.crossDomain =
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originAnchor.protocol !== anchor.protocol ||
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originAnchor.host !== anchor.host
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} catch (e) {
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this.opt.crossDomain = true
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}
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}
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// 2.1 进一步处理跨域配置
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if (this.opt.type === 'JSONP') {
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//如果没有跨域，自动转回xhr GET
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if (!this.opt.crossDomain) {
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this.opt.type = 'GET'
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} else {
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this.opt.data['callback'] =
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this.opt.data['callback'] || 'jsonp' + request.cid++
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this.jsonp(this.opt.data['callback']) //创建临时处理方法
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}
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}
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// 2.2 如果不是跨域请求，则自动加上一条header信息，用以标识这是ajax请求
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if (!this.opt.crossDomain) {
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this.set('X-Requested-With', 'XMLHttpRequest')
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} else {
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supportCors && (this.xhr.withCredentials = true)
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}
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// 3. data转字符串
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this.opt.param = Format.param(this.opt.data)
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// 4. 设置Content-Type类型, 默认x-www-form-urlencoded
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if (!this.opt.formType) this.type('form')
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// 5.处理GET请求
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this.opt.hasContent = this.opt.type === 'POST' //是否为post请求
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if (!this.opt.hasContent) {
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//GET请求直接把参数拼接到url上
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if (this.opt.param) {
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this.opt.url += (/\?/.test(this.opt.url) ? '&' : '?') + this.opt.param
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}
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//加随机值,避免缓存
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if (this.opt.cache === false)
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this.opt.url +=
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(/\?/.test(this.opt.url) ? '&' : '?') + '_=' + Math.random()
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} else {
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if (this.opt.formType === 'form-data') {
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delete this.opt.headers['content-type']
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this.opt.param = this.formData()
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} else if (this.opt.formType !== 'form') {
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this.opt.param = JSON.stringify(this.opt.data)
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}
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}
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//jsonp
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if (this.opt.type === 'JSONP') {
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this.transport = doc.createElement('script')
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this.transport.onerror = this.transport.onload = function() {
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_this.dispatch(_this.transport)
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}
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this.transport.src = this.opt.url
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doc.head.insertBefore(this.transport, doc.head.firstChild)
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//6. 超时处理
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if (this.opt.timeout && this.opt.timeout > 0) {
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this.opt.timeoutID = setTimeout(function() {
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_this.transport.onerror = _this.transport.onload = null
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_this.dispatch(null)
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}, this.opt.timeout)
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}
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} else {
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this.xhr.onreadystatechange = function(ev) {
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if (_this.opt.timeout && _this.opt.timeout > 0) {
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_this.opt['time' + this.readyState] = ev.timeStamp
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if (this.readyState === 4) {
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_this.opt.isTimeout =
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_this.opt.time4 - _this.opt.time1 > _this.opt.timeout
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}
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}
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if (this.readyState !== 4) {
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return
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}
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_this.dispatch(_this.opt.isTimeout ? null : _this.xhr)
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}
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// 6. 初始化xhr提交
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this.xhr.open(this.opt.type, this.opt.url, true)
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// 7. 设置头信息
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for (var i in this.opt.headers) {
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if (this.opt.headers[i]) this.xhr.setRequestHeader(i, this.opt.headers[i])
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}
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// 8. 发起网络请求
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_this.xhr.send(_this.opt.param)
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//超时处理
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if (this.opt.timeout && this.opt.timeout > 0) {
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this.xhr.timeout = this.opt.timeout
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}
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}
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return this.defer.promise
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}
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// ---------------------- end ------------------------
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if (!win.request) {
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win.request = {
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get: function(url) {
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if (!url) throw new Error('argument url is required')
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return new _request(url, 'GET')
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},
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post: function(url) {
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if (!url) throw new Error('argument url is required')
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return new _request(url, 'POST')
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},
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cache: {},
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cid: 0,
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version: '1.1.0-light'
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}
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Anot.ui.request = request.version
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}
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export default request
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JavaScript
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CSS
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