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May 26, 2014 09:51
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Backbone.sync = function(method, model, options) { | |
var type = methodMap[method]; | |
// Default options, unless specified. | |
_.defaults(options || (options = {}), { | |
emulateHTTP: Backbone.emulateHTTP, | |
emulateJSON: Backbone.emulateJSON | |
}); | |
// Default JSON-request options. | |
var params = {type: type, dataType: 'json'}; | |
// Ensure that we have a URL. | |
if (!options.url) { | |
params.url = _.result(model, 'url') || urlError(); | |
} | |
// Ensure that we have the appropriate request data. | |
if (options.data == null && model && (method === 'create' || method === 'update' || method === 'patch')) { | |
params.contentType = 'application/json'; | |
params.data = JSON.stringify(options.attrs || model.toJSON(options)); | |
} | |
// For older servers, emulate JSON by encoding the request into an HTML-form. | |
if (options.emulateJSON) { | |
params.contentType = 'application/x-www-form-urlencoded'; | |
params.data = params.data ? {model: params.data} : {}; | |
} | |
// For older servers, emulate HTTP by mimicking the HTTP method with `_method` | |
// And an `X-HTTP-Method-Override` header. | |
if (options.emulateHTTP && (type === 'PUT' || type === 'DELETE' || type === 'PATCH')) { | |
params.type = 'POST'; | |
if (options.emulateJSON) params.data._method = type; | |
var beforeSend = options.beforeSend; | |
options.beforeSend = function(xhr) { | |
xhr.setRequestHeader('X-HTTP-Method-Override', type); | |
if (beforeSend) return beforeSend.apply(this, arguments); | |
}; | |
} | |
// Don't process data on a non-GET request. | |
if (params.type !== 'GET' && !options.emulateJSON) { | |
params.processData = false; | |
} | |
// If we're sending a `PATCH` request, and we're in an old Internet Explorer | |
// that still has ActiveX enabled by default, override jQuery to use that | |
// for XHR instead. Remove this line when jQuery supports `PATCH` on IE8. | |
if (params.type === 'PATCH' && noXhrPatch) { | |
params.xhr = function() { | |
return new ActiveXObject("Microsoft.XMLHTTP"); | |
}; | |
} | |
// Make the request, allowing the user to override any Ajax options. | |
var xhr = options.xhr = Backbone.ajax(_.extend(params, options)); | |
model.trigger('request', model, xhr, options); | |
return xhr; | |
}; | |
var noXhrPatch = | |
typeof window !== 'undefined' && !!window.ActiveXObject && | |
!(window.XMLHttpRequest && (new XMLHttpRequest).dispatchEvent); | |
// Map from CRUD to HTTP for our default `Backbone.sync` implementation. | |
var methodMap = { | |
'create': 'POST', | |
'update': 'PUT', | |
'patch': 'PATCH', | |
'delete': 'DELETE', | |
'read': 'GET' | |
}; | |
// Set the default implementation of `Backbone.ajax` to proxy through to `$`. | |
// Override this if you'd like to use a different library. | |
Backbone.ajax = function() { | |
return Backbone.$.ajax.apply(Backbone.$, arguments); | |
}; |
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