add HTML entity de- and encoding

dencode.js

@@ -92,6 +92,41 @@
 					};
 				}
 			}
+		},
+		{
+			"id": "encodehtmlentities",
+			"name": "Encode HTML entities",
+			"convert": function (input) {
+				return {
+					"status": "OK",
+					"content": input
+						.replace(/\&/g, "&")
+						.replace(/\</g, "&lt;")
+						.replace(/\>/g, "&gt;")
+						.replace(/\"/g, "&quot;")
+				};
+			}
+		},
+		{
+			"id": "decodehtmlentities",
+			"name": "Decode HTML entities",
+			"convert": function (input) {
+				try {
+					return {
+						"status": "OK",
+						"content": input
+							.replace(/\&quot\;/g, "\"")
+							.replace(/\&gt\;/g, ">")
+							.replace(/\&lt\;/g, "<")
+							.replace(/\&amp\;/g, "&")
+					};
+				} catch (exception) {
+					return {
+						"status": "ERROR",
+						"content": "Invalid HTML entity string."
+					};
+				}
+			}
 		}
 	];
 
@@ -151,7 +186,7 @@
 		}
 		if (appendNewOutput) {
 			if (output !== "") {
-				$output = $(template.replace(/\{index\}/g, "" + outputIndex).replace(/\{content\}/g, output));
+				$output = $(template.replace(/\{index\}/g, "" + outputIndex).replace(/\{content\}/g, output.replace(/\&/g, "&amp;")));
 				if (status === "ERROR") {
 					$output.find("textarea").addClass("error");
 				}