Add an option to set a timeout for XHR requests (#95)

Closes #24.

README.md

@@ -392,6 +392,10 @@ Useful to debug page layout differences.
 
 When set to true, clicking on a link that point the current url trigger a full page reload.
 
+##### `timeout` (Integer, default to 0)
+
+The timeout in milliseconds for the XHR requests. Set to 0 to disable the timeout.
+
 ### Events
 
 Pjax fires a number of events regardless of how its invoked.

index.js

@@ -158,6 +158,7 @@ Pjax.prototype = {
     trigger(document, "pjax:send", options);
 
     // Do the request
+    options.requestOptions.timeout = this.options.timeout
     this.doRequest(href, options.requestOptions, function(html) {
       // Fail if unable to load HTML via AJAX
       if (html === false) {

lib/proto/parse-options.js

@@ -23,6 +23,7 @@ module.exports = function(options){
   this.options.scrollTo = (typeof this.options.scrollTo === 'undefined') ? 0 : this.options.scrollTo;
   this.options.cacheBust = (typeof this.options.cacheBust === 'undefined') ? true : this.options.cacheBust
   this.options.debug = this.options.debug || false
+  this.options.timeout = this.options.timeout || 0
 
   // we can’t replace body.outerHTML or head.outerHTML
   // it create a bug where new body or new head are created in the dom
@@ -37,4 +38,4 @@ module.exports = function(options){
   if (typeof options.analytics !== "function") {
     options.analytics = function() {}
   }
-}
+}

lib/request.js

@@ -15,12 +15,17 @@ module.exports = function(location, options, callback) {
     }
   }
 
+  request.ontimeout = function() {
+    callback(null, request)
+  }
+
   // Add a timestamp as part of the query string if cache busting is enabled
   if (this.options.cacheBust) {
     location += (!/[?&]/.test(location) ? "?" : "&") + new Date().getTime()
   }
 
   request.open(requestMethod.toUpperCase(), location, true)
+  request.timeout = options.timeout
   request.setRequestHeader("X-Requested-With", "XMLHttpRequest")
   request.setRequestHeader("X-PJAX", "true")