when converting, return an object with a status plus the result

dencoder.js

@@ -4,14 +4,20 @@
 			"id": "CHOOSE",
 			"name": "Please choose your conversion ...",
 			"convert": function(input) {
-				return "";
+				return {
+					"status": "OK",
+					"content": ""
+				};
 			}
 		},
 		{
 			"id": "base64encode",
 			"name": "Base64 encode",
 			"convert": function(input) {
-				return btoa(input);
+				return {
+					"status": "OK",
+					"content": btoa(input)
+				};
 			}
 		},
 		{
@@ -19,9 +25,15 @@
 			"name": "Base64 decode",
 			"convert": function(input) {
 				try {
-					return atob(input);
+					return {
+						"status": "OK",
+						"content": atob(input)
+					};
 				} catch (exception) {
-					return "Invalid base64 input string.";
+					return {
+						"status": "ERROR",
+						"content": "Invalid base64 input string."
+					};
 				}
 			}
 		},
@@ -29,7 +41,10 @@
 			"id": "encodeuri",
 			"name": "Encode URI",
 			"convert": function(input) {
-				return encodeURI(input).replace(/%5B/g, '[').replace(/%5D/g, ']');
+				return {
+					"status": "OK",
+					"content": encodeURI(input).replace(/%5B/g, '[').replace(/%5D/g, ']')
+				};
 			}
 		},
 		{
@@ -37,9 +52,15 @@
 			"name": "Decode URI",
 			"convert": function(input) {
 				try {
-					return decodeURI(input)
+					return {
+						"status": "OK",
+						"content": decodeURI(input)
+					};
 				} catch (exception) {
-					return "Invalid URI string.";
+					return {
+						"status": "ERROR",
+						"content": "Invalid URI input string."
+					};
 				}
 			}
 		},
@@ -47,9 +68,12 @@
 			"id": "encodeuricomponent",
 			"name": "Encode URI component",
 			"convert": function(input) {
-				return encodeURIComponent(input).replace(/[!'()*]/g, function(c) {
-					return '%' + c.charCodeAt(0).toString(16);
-				});
+				return {
+					"status": "OK",
+					"content": encodeURIComponent(input).replace(/[!'()*]/g, function(c) {
+							return '%' + c.charCodeAt(0).toString(16);
+						})
+				};
 			}
 		},
 		{
@@ -57,9 +81,15 @@
 			"name": "Decode URI component",
 			"convert": function(input) {
 				try {
-					return decodeURIComponent(input)
+					return {
+						"status": "OK",
+						"content": decodeURIComponent(input)
+					};
 				} catch (exception) {
-					return "Invalid URI component string.";
+					return {
+						"status": "ERROR",
+						"content": "Invalid URI component input string."
+					};
 				}
 			}
 		}
@@ -103,6 +133,8 @@
 		var appendNewOutput = false;
 		var input = $input.val();
 		var conversion = $select.find(":selected").attr("name");
+		var result;
+		var status;
 		var output;
 		var plugin;
 		if ($output.length == 0) {
@@ -110,17 +142,28 @@
 		}
 		plugin = getPluginById(conversion);
 		if (plugin !== null) {
-			output = plugin.convert(input);
+			result = plugin.convert(input);
+			output = result.content;
+			status = result.status
 		} else {
-			output = "internal error. Sorry.";
+			output = "Internal error. Sorry.";
+			status = "ERROR";
 		}
 		if (appendNewOutput) {
 			if (output !== "") {
 				$output = $(template.replace(/\{index\}/g, "" + outputIndex).replace(/\{content\}/g, output));
+				if (status === "ERROR") {
+					$output.find("textarea").addClass("error");
+				}
 				$("body").append($output);
 			}
 		} else {
 			$output.val(output);
+			if (status === "ERROR") {
+				$output.addClass("error");
+			} else {
+				$output.removeClass("error");
+			}
 			update($output);
 		}
 	}