Refactor for clarity.

Author: carbonwallet

js/blockchain.js

@@ -0,0 +1,50 @@
+// Here we hold all the interactions with the blockchain.
+var BLOCKCHAIN = new function () {
+  
+  this.retrieveBalance = function(address, callback) {
+    url = 'http://blockchain.info/q/addressbalance/';
+    this.tx_fetch(url + address, callback);
+  }
+  
+  this.getUnspentOutputs = function(address, callback) {
+
+      var url = 'http://blockchain.info/unspent?address=' + address;
+
+      this.tx_fetch(url, callback);
+  }
+  
+  this.sendTX = function(tx, callback) {
+
+      url = 'http://blockchain.info/pushtx';
+      postdata = 'tx=' + tx;
+      if (url != null && url != "") {
+          this.tx_fetch(url, callback, callback, postdata);
+      }
+  }
+  
+  // Some cross-domain magic (to bypass Access-Control-Allow-Origin)
+  this.tx_fetch = function(url, onSuccess, onError, postdata) {
+      var useYQL = true;
+
+      if (useYQL) {
+          var q = 'select * from html where url="'+url+'"';
+          if (postdata) {
+              q = 'use "http://brainwallet.github.com/js/htmlpost.xml" as htmlpost; ';
+              q += 'select * from htmlpost where url="' + url + '" ';
+              q += 'and postdata="' + postdata + '" and xpath="//p"';
+          }
+          url = 'https://query.yahooapis.com/v1/public/yql?q=' + encodeURIComponent(q);
+      }
+
+      $.ajax({
+          url: url,
+          success: function(res) {
+              onSuccess(useYQL ? $(res).find('results').text() : res.responseText);
+          },
+          error:function (xhr, opt, err) {
+              if (onError)
+                  onError(err);
+          }
+      });
+  }
+}