Created
September 17, 2014 23:18
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| m.request = function(xhrOptions) { | |
| var deferred = m.deferred() | |
| var serialize = xhrOptions.serialize = xhrOptions.serialize || JSON.stringify | |
| var deserialize = xhrOptions.deserialize = xhrOptions.deserialize || JSON.parse | |
| var extract = xhrOptions.extract || function(xhr) { | |
| return xhr.responseText.length === 0 && deserialize === JSON.parse ? null : xhr.responseText | |
| } | |
| xhrOptions.onload = xhrOptions.onerror = function(e) { | |
| e = e || event | |
| var unwrap = (e.type == "load" ? xhrOptions.unwrapSuccess : xhrOptions.unwrapError) || identity | |
| try { | |
| var response = unwrap(deserialize(extract(e.target, xhrOptions))) | |
| if (e.type == "load") { | |
| if (type.call(response) == "[object Array]" && xhrOptions.type) { | |
| for (var i = 0; i < response.length; i++) response[i] = new xhrOptions.type(response[i]) | |
| } | |
| else if (xhrOptions.type) response = new xhrOptions.type(response) | |
| deferred.resolve(response); | |
| } | |
| else deferred.reject(response); | |
| } | |
| catch (e) { | |
| // Any exception in the onerror/onload is not part of the promise, so it should still throw to the caller | |
| if (e instanceof SyntaxError) throw new SyntaxError("Could not parse HTTP response. See http://lhorie.github.io/mithril/mithril.request.html#using-variable-data-formats") | |
| else throw e | |
| } | |
| finally { | |
| // I'm assuming you always want there to be an endcomputation so I'm sticking in this finally. | |
| if (xhrOptions.background !== true) m.endComputation() | |
| } | |
| } | |
| // Put a try/catch around anything that can potentially throw on function execution. | |
| try { | |
| if (xhrOptions.background !== true) m.startComputation() | |
| xhrOptions.url = parameterizeUrl(xhrOptions.url, xhrOptions.data) | |
| xhrOptions = bindData(xhrOptions, xhrOptions.data, serialize) | |
| ajax(xhrOptions) | |
| } | |
| catch (e) { | |
| // An exception in the promise's body should call the first rejection handler | |
| deferred.reject(e); | |
| } | |
| return deferred.promise | |
| } |
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