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* ajax 请求方法，使用方式与 jQuery, Zepto 类似，对 jQuery, Zepto 无依赖
* @method io/ajax
* @see [ajax](https://github.com/ForbesLindesay/ajax)
* @example
* var $ajax = require('@spore-ui/kit/packages/io/ajax');
* document.domain = 'qq.com';
* $ajax({
* url: 'http://a.qq.com/form',
* data: [{
* n1: 'v1',
* n2: 'v2'
* }],
* success: function (rs) {
* console.info(rs);
* }
* });
*/
var type = require('../obj/type')
var jsonpID = 0,
key,
name,
rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
scriptTypeRE = /^(?:text|application)\/javascript/i,
xmlTypeRE = /^(?:text|application)\/xml/i,
jsonType = 'application/json',
htmlType = 'text/html',
blankRE = /^\s*$/
var ajax = module.exports = function(options){
var settings = extend({}, options || {})
for (key in ajax.settings) if (settings[key] === undefined) settings[key] = ajax.settings[key]
ajaxStart(settings)
Eif (!settings.crossDomain) settings.crossDomain = /^([\w-]+:)?\/\/([^\/]+)/.test(settings.url) &&
RegExp.$2 != window.location.host
var dataType = settings.dataType, hasPlaceholder = /=\?/.test(settings.url)
if (dataType == 'jsonp' || hasPlaceholder) {
Eif (!hasPlaceholder) settings.url = appendQuery(settings.url, 'callback=?')
return ajax.JSONP(settings)
}
Iif (!settings.url) settings.url = window.location.toString()
serializeData(settings)
var mime = settings.accepts[dataType],
baseHeaders = { },
protocol = /^([\w-]+:)\/\//.test(settings.url) ? RegExp.$1 : window.location.protocol,
xhr = ajax.settings.xhr(), abortTimeout
Iif (!settings.crossDomain) baseHeaders['X-Requested-With'] = 'XMLHttpRequest'
if (mime) {
baseHeaders['Accept'] = mime
Iif (mime.indexOf(',') > -1) mime = mime.split(',', 2)[0]
xhr.overrideMimeType && xhr.overrideMimeType(mime)
}
Iif (settings.contentType || (settings.data && settings.type.toUpperCase() != 'GET'))
baseHeaders['Content-Type'] = (settings.contentType || 'application/x-www-form-urlencoded')
settings.headers = extend(baseHeaders, settings.headers || {})
xhr.onreadystatechange = function(){
if (xhr.readyState == 4) {
clearTimeout(abortTimeout)
var result, error = false
if ((xhr.status >= 200 && xhr.status < 300) || xhr.status == 304 || (xhr.status == 0 && protocol == 'file:')) {
dataType = dataType || mimeToDataType(xhr.getResponseHeader('content-type'))
result = xhr.responseText
try {
Iif (dataType == 'script') (1,eval)(result)
else Iif (dataType == 'xml') result = xhr.responseXML
else if (dataType == 'json') result = blankRE.test(result) ? null : JSON.parse(result)
} catch (e) { error = e }
Iif (error) ajaxError(error, 'parsererror', xhr, settings)
else ajaxSuccess(result, xhr, settings)
} else {
ajaxError(null, 'error', xhr, settings)
}
}
}
var async = 'async' in settings ? settings.async : true
xhr.open(settings.type, settings.url, async)
for (name in settings.headers) xhr.setRequestHeader(name, settings.headers[name])
Iif (ajaxBeforeSend(xhr, settings) === false) {
xhr.abort()
return false
}
if (settings.timeout > 0) abortTimeout = setTimeout(function(){
xhr.onreadystatechange = empty
xhr.abort()
ajaxError(null, 'timeout', xhr, settings)
}, settings.timeout)
// avoid sending empty string (#319)
xhr.send(settings.data ? settings.data : null)
return xhr
}
// trigger a custom event and return false if it was cancelled
function triggerAndReturn(context, eventName, data) {
//todo: Fire off some events
//var event = $.Event(eventName)
//$(context).trigger(event, data)
return true;//!event.defaultPrevented
}
// trigger an Ajax "global" event
function triggerGlobal(settings, context, eventName, data) {
Eif (settings.global) return triggerAndReturn(context || document, eventName, data)
}
// Number of active Ajax requests
ajax.active = 0
function ajaxStart(settings) {
Eif (settings.global && ajax.active++ === 0) triggerGlobal(settings, null, 'ajaxStart')
}
function ajaxStop(settings) {
if (settings.global && !(--ajax.active)) triggerGlobal(settings, null, 'ajaxStop')
}
// triggers an extra global event "ajaxBeforeSend" that's like "ajaxSend" but cancelable
function ajaxBeforeSend(xhr, settings) {
var context = settings.context
Iif (settings.beforeSend.call(context, xhr, settings) === false ||
triggerGlobal(settings, context, 'ajaxBeforeSend', [xhr, settings]) === false)
return false
triggerGlobal(settings, context, 'ajaxSend', [xhr, settings])
}
function ajaxSuccess(data, xhr, settings) {
var context = settings.context, status = 'success'
settings.success.call(context, data, status, xhr)
triggerGlobal(settings, context, 'ajaxSuccess', [xhr, settings, data])
ajaxComplete(status, xhr, settings)
}
// type: "timeout", "error", "abort", "parsererror"
function ajaxError(error, type, xhr, settings) {
var context = settings.context
settings.error.call(context, xhr, type, error)
triggerGlobal(settings, context, 'ajaxError', [xhr, settings, error])
ajaxComplete(type, xhr, settings)
}
// status: "success", "notmodified", "error", "timeout", "abort", "parsererror"
function ajaxComplete(status, xhr, settings) {
var context = settings.context
settings.complete.call(context, xhr, status)
triggerGlobal(settings, context, 'ajaxComplete', [xhr, settings])
ajaxStop(settings)
}
// Empty function, used as default callback
function empty() {}
ajax.JSONP = function(options){
Iif (!('type' in options)) return ajax(options)
var callbackName = 'jsonp' + (++jsonpID),
script = document.createElement('script'),
abort = function(){
//todo: remove script
//$(script).remove()
Eif (callbackName in window) window[callbackName] = empty
ajaxComplete('abort', xhr, options)
},
xhr = { abort: abort }, abortTimeout,
head = document.getElementsByTagName("head")[0]
|| document.documentElement
Eif (options.error) script.onerror = function() {
xhr.abort()
options.error()
}
window[callbackName] = function(data){
clearTimeout(abortTimeout)
//todo: remove script
//$(script).remove()
delete window[callbackName]
ajaxSuccess(data, xhr, options)
}
serializeData(options)
script.src = options.url.replace(/=\?/, '=' + callbackName)
// Use insertBefore instead of appendChild to circumvent an IE6 bug.
// This arises when a base node is used (see jQuery bugs #2709 and #4378).
head.insertBefore(script, head.firstChild);
Eif (options.timeout > 0) abortTimeout = setTimeout(function(){
xhr.abort()
ajaxComplete('timeout', xhr, options)
}, options.timeout)
return xhr
}
ajax.settings = {
// Default type of request
type: 'GET',
// Callback that is executed before request
beforeSend: empty,
// Callback that is executed if the request succeeds
success: empty,
// Callback that is executed the the server drops error
error: empty,
// Callback that is executed on request complete (both: error and success)
complete: empty,
// The context for the callbacks
context: null,
// Whether to trigger "global" Ajax events
global: true,
// Transport
xhr: function () {
return new window.XMLHttpRequest()
},
// MIME types mapping
accepts: {
script: 'text/javascript, application/javascript',
json: jsonType,
xml: 'application/xml, text/xml',
html: htmlType,
text: 'text/plain'
},
// Whether the request is to another domain
crossDomain: false,
// Default timeout
timeout: 0
}
function mimeToDataType(mime) {
return mime && ( mime == htmlType ? 'html' :
mime == jsonType ? 'json' :
scriptTypeRE.test(mime) ? 'script' :
xmlTypeRE.test(mime) && 'xml' ) || 'text'
}
function appendQuery(url, query) {
return (url + '&' + query).replace(/[&?]{1,2}/, '?')
}
// serialize payload and append it to the URL for GET requests
function serializeData(options) {
if (type(options.data) === 'object') options.data = param(options.data)
if (options.data && (!options.type || options.type.toUpperCase() == 'GET'))
options.url = appendQuery(options.url, options.data)
}
ajax.get = function(url, success){ return ajax({ url: url, success: success }) }
ajax.post = function(url, data, success, dataType){
if (type(data) === 'function') dataType = dataType || success, success = data, data = null
return ajax({ type: 'POST', url: url, data: data, success: success, dataType: dataType })
}
ajax.getJSON = function(url, success){
return ajax({ url: url, success: success, dataType: 'json' })
}
var escape = encodeURIComponent
function serialize(params, obj, traditional, scope){
var array = type(obj) === 'array';
for (var key in obj) {
var value = obj[key];
Iif (scope) key = traditional ? scope : scope + '[' + (array ? '' : key) + ']'
// handle data in serializeArray() format
Iif (!scope && array) params.add(value.name, value.value)
// recurse into nested objects
else Iif (traditional ? (type(value) === 'array') : (type(value) === 'object'))
serialize(params, value, traditional, key)
else params.add(key, value)
}
}
function param(obj, traditional){
var params = []
params.add = function(k, v){ this.push(escape(k) + '=' + escape(v)) }
serialize(params, obj, traditional)
return params.join('&').replace('%20', '+')
}
function extend(target) {
var slice = Array.prototype.slice;
slice.call(arguments, 1).forEach(function(source) {
for (key in source)
Eif (source[key] !== undefined)
target[key] = source[key]
})
return target
}
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