check javascriptEnabled status in the page

 * checks javascriptEnabled status, before `evaluating` JS
 * fixes #841

@@ -432,6 +432,19 @@ Casper.prototype.checkStarted = function checkStarted() {
 };
 
 /**
+ * Checks if executing JavaScript in the Page is enabled.
+ *
+ * @return Boolean
+ */
+Casper.prototype.javascriptEnabled = function javascriptEnabled() {
+    "use strict";
+    if (this.options.pageSettings.javascriptEnabled === false) {
+        return false;
+    }
+    return true;
+};
+
+/**
  * Clears the current page execution environment context. Useful to avoid
  * having previously loaded DOM contents being still active (refs #34).
  *
@@ -690,6 +703,10 @@ Casper.prototype.echo = function echo(text, style, pad) {
 Casper.prototype.evaluate = function evaluate(fn, context) {
     "use strict";
     this.checkStarted();
+    // check whether javascript is enabled !!
+    if (!this.javascriptEnabled()) {
+        throw new CasperError("evaluate() requires javascript to be enabled");
+    }
     // preliminary checks
     if (!utils.isFunction(fn) && !utils.isString(fn)) { // phantomjs allows functions defs as string
         throw new CasperError("evaluate() only accepts functions or strings");
@@ -980,9 +997,13 @@ Casper.prototype.getCurrentUrl = function getCurrentUrl() {
     "use strict";
     this.checkStarted();
     try {
+        if (!this.javascriptEnabled()) {
+            return this.page.url;
+        } else {
             return utils.decodeUrl(this.evaluate(function _evaluate() {
                 return document.location.href;
             }));
+        }
     } catch (e) {
         // most likely the current page object has been "deleted" (think closed popup)
         if (/deleted QObject/.test(e.message))

@@ -110,3 +110,22 @@ casper.test.begin("evaluate() returns a value which can be altered", 1, function
         test.done();
     });
 });
+
+// https://github.com/n1k0/casperjs/issues/841
+casper.test.begin("evaluate() with js disabled, throws error", 1, function(test) {
+    casper.options.pageSettings.javascriptEnabled = false;
+    casper.start().then(function() {
+        function getListResult() {
+            return this.evaluate(function() {
+                return [{a: 1}, {b: 2}];
+        });
+        }
+        test.assertThrows(getListResult, undefined,
+            "Casper.evaluate() raises an error if JavaScript is disabled in the page");
+    });
+
+    casper.run(function() {
+        test.done();
+        casper.options.pageSettings.javascriptEnabled = true;
+    });
+});
\ No newline at end of file

@@ -51,6 +51,26 @@ casper.test.begin('open() GET casing tests', 2, {
     }
 });
 
+casper.test.begin('open() (JS disabled) tests', 3, {
+    setUp: setUp,
+    tearDown: tearDown,
+    test: function(test) {
+        casper.options.pageSettings.javascriptEnabled = false;
+        casper.open('tests/site/alert.html').then(function() {
+            test.pass("Casper.open() can open and load a location using GET, with JS disabled");
+            test.assertEquals(usedSettings, {
+                method: "get"
+            }, "Casper.open() used the expected GET settings");
+            test.assertHttpStatus(200, "Response Code is 200");
+        });
+
+        casper.run(function() {
+            test.done();
+            casper.options.pageSettings.javascriptEnabled = true;
+        });
+    }
+});
+
 casper.test.begin('open() POST tests', 2, {
     setUp: setUp,
     tearDown: tearDown,

@@ -23,3 +23,17 @@ casper.test.begin('urls tests', 6, function(test) {
         test.done();
     });
 });
+
+// https://github.com/n1k0/casperjs/issues/841
+casper.test.begin('url tests with javascript disabled', 1, function(test) {
+    casper.options.pageSettings.javascriptEnabled = false;
+    casper.start('tests/site/urls.html');
+    casper.then(function() {
+        test.assertMatch(this.getCurrentUrl(), /urls\.html$/,
+            'Casper.getCurrentUrl() can work, with javascript disabled');
+    });
+    casper.run(function() {
+        test.done();
+        casper.options.pageSettings.javascriptEnabled = true;
+    });
+});