47 lines
1.9 KiB
TypeScript
47 lines
1.9 KiB
TypeScript
module Typertext.Transport {
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import HttpMethod = Typertext.Http.HttpMethod;
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import HttpUrl = Typertext.Http.HttpUrl
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import HttpPostData = Typertext.Http.HttpPostData;
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import HttpResponseHandler = Typertext.Http.HttpResponseHandler;
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export class TransportChooser {
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/**
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*
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* @param {HttpMethod} method
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* @param {HttpUrl} request
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* @param {HttpPostData} postData
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* @param {HttpResponseHandler} callback
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* @returns {GenericTransport}
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*/
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static Transport(method:HttpMethod, request:HttpUrl, postData:HttpPostData, callback:HttpResponseHandler):GenericTransport {
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//Prepare to test if we are in IE
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var ieTestDiv = document.createElement("div");
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ieTestDiv.innerHTML = "<!--[if lte IE 7]><i></i><![endif]-->";
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if (ieTestDiv.getElementsByTagName("i").length === 1) {
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//There is currently no supported transport for IE lte 7
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throw {};
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}
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//Now test how we should proceed normally
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ieTestDiv.innerHTML = "<!--[if lte IE 9]><i></i><![endif]-->";
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var ieLte9 = (ieTestDiv.getElementsByTagName("i").length === 1);
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var origin = HttpUrl.FromUrl(window.location.href);
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//If this is a CORS request in a modern browser
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if (!origin.CrossOriginCheck(origin) || !ieLte9) {
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//Just use a standard XHR request
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return new XHR(method, request, postData, callback);
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}
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//Otherwise if we aren't cross protocol
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if (origin.GetProtocol() === request.GetProtocol()) {
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//Use IE's silly XDomainRequest
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return new XDR(method, request, postData, callback);
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}
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//Otherwise there is no supported transport
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throw {};
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}
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}
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} |