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Unified Diff: src/site/articles/trydart/examples/6-piratebadge_json/piratebadge.dart

Issue 35913002: Try Dart 1 hour experience first draft (Closed) Base URL: https://github.com/dart-lang/dartlang.org.git@master
Patch Set: rough draft ready for review (2nd try after errors) Created 7 years, 2 months ago
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Index: src/site/articles/trydart/examples/6-piratebadge_json/piratebadge.dart
diff --git a/src/site/articles/trydart/examples/6-piratebadge_json/piratebadge.dart b/src/site/articles/trydart/examples/6-piratebadge_json/piratebadge.dart
new file mode 100644
index 0000000000000000000000000000000000000000..356d14b972a17b9e3d55dcd87d83522398c9d851
--- /dev/null
+++ b/src/site/articles/trydart/examples/6-piratebadge_json/piratebadge.dart
@@ -0,0 +1,127 @@
+// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+
+// Demonstrates:
+// list, maps, random, strings, string interpolation, cascade, fat arrow,
+// named constructors.
+// optional parameters.
+// a class
+// getters, setters
+// httprequest, JSON
+// local storage
+// static class-level methods/fields
+// top-level variable and functions
+// typecasting with 'as'
+// futures
+// import, also with show
+
+import 'dart:html';
+import 'dart:math' show Random;
+import 'dart:convert' show JSON;
+import 'dart:async' show Future;
+
+final String TREASUREKEY = 'pirateName';
+
+SpanElement badgeNameElement;
+ButtonElement genButton;
+
+void main() {
+ InputElement inputField = query('#inputName')
+ ..onInput.listen(updateBadge);
+ genButton = query('#generateButton')
+ ..onClick.listen(generateBadge);
+
+ badgeNameElement = query('#badgeName');
+
+ PirateName.readyThePirates()
+ .then((_) {
+ inputField.disabled = false; //enable
+ genButton.disabled = false; //enable
+ badgeName = pirateNameFromStorage;
+ })
+ .catchError((arrr) {
+ print('Error initializing pirate names: $arrr');
+ badgeNameElement.text = 'Arrr! No names.';
+ });
+}
+
+void updateBadge(Event e) {
+ String inputName = (e.target as InputElement).value;
+
+ badgeName = new PirateName(firstName: inputName);
+ if (inputName.trim().isEmpty) {
+ genButton..disabled = false
+ ..text = 'Generate badge';
+ } else {
+ genButton..disabled = true
+ ..text = 'Arrr! Remove the text!';
+ }
+}
+
+void generateBadge(Event e) {
+ badgeName = new PirateName();
+}
+
+set badgeName(PirateName newName) {
+ badgeNameElement.text = newName.pirateName;
+ window.localStorage[TREASUREKEY] = newName.toJsonString();
+}
+
+PirateName get pirateNameFromStorage {
+ String storedName = window.localStorage[TREASUREKEY];
+ if (storedName != null) {
+ return new PirateName.fromJSON(storedName);
+ } else {
+ return null;
+ }
+}
+
+class PirateName {
+
+ static final Random indexGen = new Random();
+
+ static List<String> names = [];
+ static List<String> appellations = [];
+
+ String _firstName;
+ String _appellation;
+
+ PirateName({String firstName, String appellation}) {
+ if (firstName == null) {
+ _firstName = names[indexGen.nextInt(names.length)];
+ } else {
+ _firstName = firstName;
+ }
+ if (appellation == null) {
+ _appellation = appellations[indexGen.nextInt(appellations.length)];
+ } else {
+ _appellation = appellation;
+ }
+ }
+
+ PirateName.fromJSON(String jsonString) {
+ Map storedName = JSON.decode(jsonString);
+ _firstName = storedName['f'];
+ _appellation = storedName['a'];
+ }
+
+ String toString() => pirateName;
+
+ String toJsonString() => '{ "f": "$_firstName", "a": "$_appellation" } ';
+
+ String get pirateName => '$_firstName the $_appellation';
+
+ static Future readyThePirates() {
+ String path = 'piratenames.json';
+ return HttpRequest.getString(path)
+ .then(_parsePirateNamesFromJSON);
+ }
+
+ static _parsePirateNamesFromJSON(String jsonString) {
+ Map pirateNames = JSON.decode(jsonString);
+ names = pirateNames['names'];
+ appellations = pirateNames['appellations'];
+ }
+}

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