js: fix newslash.js to support IE/Edge

diff --git a/src/newslash_web/public/js/newslash.js b/src/newslash_web/public/js/newslash.js
index dd479d5..ec76931 100644 (file)
--- a/src/newslash_web/public/js/newslash.js
+++ b/src/newslash_web/public/js/newslash.js
@@ -50,13 +50,27 @@ function _initNewslash() {
       req.responseType = "json";
       req.onreadystatechange = function onReadyStateChange () {
         if (req.readyState == XMLHttpRequest.DONE) {
+          // hack for IE/Edge support (req.responseType == "json" is not supported)
+          var respType = req.responseType;
+          var resp = req.response;
+
+          if (respType === "") {
+            try {
+              resp = JSON.parse(req.response);
+              respType = "json";
+            } catch(e) {
+              console.log("Newslash.post: cannot parse JSON");
+            }
+          }
+
           // request done
-          if (req.status == 200 && req.responseType == "json") {
-            return resolve(req.response);
+          if (req.status == 200 && respType == "json") {
+            return resolve(resp);
           }
+
           // request failed
-          if (req.responseType == "json") {
-            return reject(req.response);
+          if (respType == "json") {
+            return reject(resp);
           }
           return reject(req);
         }
@@ -82,17 +96,31 @@ function _initNewslash() {
       req.responseType = "json";
       req.onreadystatechange = () => {
         if (req.readyState == XMLHttpRequest.DONE) {
+          // hack for IE/Edge support (req.responseType == "json" is not supported)
+          var respType = req.responseType;
+          var resp = req.response;
+
+          if (respType === "") {
+            try {
+              resp = JSON.parse(req.response);
+              respType = "json";
+            } catch(e) {
+              console.log("Newslash.post: cannot parse JSON");
+            }
+          }
+
           // request done
-          if (req.status == 200 && req.responseType == "json") {
-            return resolve(req.response);
+          if (req.status == 200 && respType == "json") {
+            return resolve(resp);
           }
+          
           // request failed
-          if (req.responseType == "json") {
-            if (req.response && req.response.reason == "invalid_csrf_token") {
+          if (respType == "json") {
+            if (resp && resp.reason == "invalid_csrf_token") {
               if (retryCount >= 3) {
                 return reject({error: 1, reason: "exceeded retry count"});
               }
-              var newToken = req.response.csrf_token;
+              var newToken = resp.csrf_token;
               if (newToken) {
                 data.csrf_token = newToken;
                 // retry with new token
@@ -100,7 +128,7 @@ function _initNewslash() {
                 return 1;
               }
             }
-            return reject(req.response);
+            return reject(resp);
           }
           return reject(req);
         }