Added a list of Prebid Server adapters (prebid#817)

* Added an autogenerated list of Prebid Server adapters.

* Clarified what is in this bidder list.

* More elegant javascript.

* Added some more error handling, in case the server responded badly.

Author: dbemiller

assets/js/prebid-server-api.js

@@ -0,0 +1,26 @@
+var pbs = function() {
+  function getJSON(url, onSuccess, onFailure) {
+    req = new XMLHttpRequest();
+    req.onreadystatechange = function() {
+      if (req.readyState === 4) {
+        if (req.status === 200) {
+          try {
+            onSuccess(JSON.parse(req.responseText));
+          } catch (e) {
+            onFailure(req.status, e.message)
+          }
+        } else {
+          onFailure(req.status, req.responseText);
+        }
+      }
+    }
+    req.open("GET", url);
+    req.send();
+  }
+
+  return {
+    // Calls onSuccess() with a list of Prebid Server bidders, like ["appnexus", "adform", "adtelligent", ...],
+    // or onFailure with the HTTP status & response text if the call failed.
+    fetchBidders: getJSON.bind(null, "https://prebid.adnxs.com/pbs/v1/info/bidders")
+  }
+}()

dev-docs/get-started-with-prebid-server.md

@@ -7,18 +7,18 @@ top_nav_section: dev_docs
 nav_section: prebid-server
 ---
 
+<script type="text/javascript" src="{{site.baseurl}}/assets/js/prebid-server-api.js"></script>
 <div class="bs-docs-section" markdown="1">
 
 # Get Started with Prebid Server
 {:.no_toc}
 
-This page has instructions for adding Prebid Server to Prebid.js.
+Prebid Server improves your page's performance by running the header bidding auction on a server.
+This will improve your page's load time, which should improve your users' experience.
 
-For many publishers, client-side header bidding is a balancing act between the inclusion of demand partners and impact to the page.
+The following adapters are supported by the latest tagged version of Prebid Server:
 
-Using Prebid Server, you can move demand partners server-side, eliminating most of the latency impact that comes with adding more partners.
-
-This should help you make more money without sacrificing user experience.
+<ul id="prebid-server-bidder-list"></ul>
 
 {: .alert.alert-success :}
 **Prebid Server is open source!**
@@ -170,3 +170,23 @@ var adUnit1 = {
 + [Add a Bidder Adapter to Prebid Server]({{site.baseurl}}/dev-docs/add-a-prebid-server-adapter.html)
 
 </div>
+<script type="text/javascript" async>
+(function() {
+    function onSuccess(bidders) {
+        bidders.sort();
+        var list = document.getElementById("prebid-server-bidder-list");
+        for (var i = 0; i < bidders.length; i++) {
+            var thisElement = document.createElement("li")
+            thisElement.innerHTML = bidders[i]
+            list.appendChild(thisElement)
+        }
+    }
+    function onError(status, err) {
+        var list = document.getElementById("prebid-server-bidder-list");
+        var err = document.createElement("span")
+        err.innerHTML = "Failed to fetch Prebid Server adapters. HTTP status: " + status + ". error: " + err;
+        list.parentNode.replaceChild(list, err)
+    }
+    pbs.fetchBidders(onSuccess, onError);
+})()
+</script>