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<!DOCTYPE html>
<html>
<head>
<title></title>
<!-- 2017-11-23 Thu 19:35 -->
<meta charset="utf-8" />
<meta htto-equiv="X-UA-Compatible" content="chrome=1" />
<meta name="generator" content="Org-mode with org-ioslide" />
<meta name="author" content="fatfingererr @ ClojureTW 十一月聚會" />
<!--<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0">-->
<!--<meta name="viewport" content="width=device-width, initial-scale=1.0">-->
<!--This one seems to work all the time, but really small on ipad-->
<!--<meta name="viewport" content="initial-scale=0.4">-->
<meta name="apple-mobile-web-app-capable" content="yes" />
<link rel="stylesheet" media="all" href="theme/css/default.css" />
<link rel="stylesheet" media="only screen and (max-device-width: 480px)" href="theme/css/phone.css" />
<link rel="stylesheet" media="all" href="theme/css/small-icon.css" />
<base target="_blank"> <!-- This amazingness opens all links in a new tab. -->
<script data-main="js/slides" src="js/require-1.0.8.min.js"></script>
<script src="js/jquery-1.7.1.min.js" type="text/javascript"></script>
<script src="js/mathjax/MathJax.js?config=TeX-AMS-MML_HTMLorMML,local/local" type="text/javascript"></script>
</head>
<body style="opacity: 0">
<slides class="layout-widescreen">
<slide class="title-slide segue nobackground">
<aside class="gdbar"><img src="images/clojurescript.png"></aside>
<!-- The content of this hgroup is replaced programmatically through the slide_config.json. -->
<hgroup class="auto-fadein">
<h1 data-config-title><!-- populated from slide_config.json --></h1>
<h2 data-config-subtitle><!-- populated from slide_config.json --></h2>
<p data-config-presenter><!-- populated from slide_config.json --></p>
</hgroup>
</slide>
<slide id="sec-" class=" segue dark quote nobackground" style="background-image: url(nil)">
<aside class="gdbar right bottom"><img src="images/clojurescript.png"></aside><hgroup class="">
<h2 class=" "><div id="outline-container-orgfbc8b81" class="outline-2">
<h2 id="orgfbc8b81">A Deeper Understanding of Domina Events</h2>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="flexbox vleft auto-fadein" id="text-">
<p>
</p>
</article>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-orgb2b7655" class="outline-3">
<h3 id="orgb2b7655">漸進增強策略 (Progressive Enhancement)</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>在第四章中我們提到一種網頁設計的策略，就是漸進增強</li>
</ul>
<ul>
<li>這種策略能避免瀏覽器的兼容性問題。</li>
</ul>
<ul>
<li>在漸進增強策略中，網頁應該提供兩種瀏覽方案：</li>
</ul>
<ul>
<li>1. 不支援 JS （或被停用）的基本使用者體驗</li>
</ul>
<ul>
<li>2. 支援 JS 與 Ajax 的完整使用者體驗</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-orgcc99d9f" class="outline-3">
<h3 id="orgcc99d9f">漸進增強策略 (Progressive Enhancement)</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>一般來說，我們應該首先支持基本使用者體驗</li>
</ul>
<ul>
<li>接著使網頁能支援 JS</li>
</ul>
<ul>
<li>最終引入 Ajax 達到提供完整使用者體驗的目的</li>
</ul>
<ul>
<li>接著我們會用 Tutorial 4 的 Login Form 舉例說明</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-orgcc39579" class="outline-3">
<h3 id="orgcc39579">使用漸進增強策略改善 Login Form</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>首先先來看 index.html :</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="html">
...
<div>
<label for="submit"></label>
<input type="submit" value="Login &rarr;" id="submit">
</div>
...</pre>
</div>
<ul>
<li>我們可以看到 input 的 type 是 submit</li>
</ul>
<ul>
<li>前面學過我們可以把 type 換成 button 但會要求 JS 的實現</li>
</ul>
<ul>
<li>會不符合漸進增強的策略</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org8deecf4" class="outline-3">
<h3 id="org8deecf4">使用 domina 的 listen!</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>這邊我們可以使用 domina 的 <code>listen!</code> 函數</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
;;; namespace declaration
(ns modern-cljs.login
(:require <b>[domina.core :refer [by-id value]]
[domina.events :refer [listen!]]</b>))</pre>
</div>
<ul>
<li>來根據我們在 submit 上面做了點擊後，執行帳號密碼的驗證</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
;;; init
(defn ^:export init []
(if (and js/document
(aget js/document "getElementById"))
<b>(listen! (by-id "submit") :click validate-form)</b>))</pre>
</div>
</article>
</slide>
</slide>
<slide id="sec-" class="fill white nobackground" style="background-image: url(images/listen-1.png)">
<hgroup class="">
<h2 class="white "><div id="outline-container-orgf3845d8" class="outline-3">
<h3 id="orgf3845d8"></h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org83577dd" class="outline-3">
<h3 id="org83577dd">使用 domina 的 listen!</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>雖然我們可以等待 sumbit 被 click 之後進行驗證</li>
</ul>
<ul>
<li>但是表單依舊會執行我們定義的行為，提交帳號密碼到伺服器端</li>
</ul>
<ul>
<li>但是帳號密碼如果是驗證無效的話，我們應該要擋下這個行為</li>
</ul>
<ul>
<li>因此我們要使用 <code>domina.events</code> 中的 <code>prevent-default</code> 幫忙處理這件事</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" class="fill white nobackground" style="background-image: url(images/prevent-default.png)">
<hgroup class="">
<h2 class="white "><div id="outline-container-org5b71253" class="outline-3">
<h3 id="org5b71253"></h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-orgbd75f27" class="outline-3">
<h3 id="orgbd75f27">使用 domina 的 listen!</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>先引入 <code>domina.events</code> ：</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(ns modern-cljs.login
(:require [domina.core :refer [by-id value]]
<b>[domina.events :refer [listen! prevent-default]]</b>))</pre>
</div>
<ul>
<li>就是說在 <code>validate-form</code> 擋下提交帳號密碼到伺服器端：</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(defn validate-form [e]
(if (or (empty? (value (by-id "email")))
(empty? (value (by-id "password"))))
(do
<b>(prevent-default e)</b>
(js/alert "Please, complete the form!"))
true))</pre>
</div>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org53dad2d" class="outline-3">
<h3 id="org53dad2d">使用 domina 的 listen!</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>如果仔細留意的話， <code>validate-form</code> 不會像原本的一樣回傳 <code>false</code></li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(defn validate-form [e]
(if (or (empty? (value (by-id "email")))
(empty? (value (by-id "password"))))
<b>(do
(prevent-default e)
(js/alert "Please, complete the form!"))</b> ;; return false?
true))</pre>
</div>
<ul>
<li>因為我們這邊已經用 <code>prevent-default</code> 擋下表單提交</li>
</ul>
<ul>
<li>因此就不需要回傳 <code>false</code> 來做進一步處理</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org641615e" class="outline-3">
<h3 id="org641615e">使用 domina 的 listen!</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>但是 <code>validate-form</code> 需要輸入參數，也就是事件 <code>e</code> 才能擋下提交：</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
<b>(defn validate-form [e]</b>
...
<b>(prevent-default e)</b>
(js/alert "Please, complete the form!"))
)</pre>
</div>
<ul>
<li>所以 <code>init</code> 函數需要做一個匿名函數放入事件參數</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(defn ^:export init []
(if (and js/document
(aget js/document "getElementById"))
(listen! (by-id "submit") :click <b>(fn [e] (validate-form e))</b>)))</pre>
</div>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org0c05c35" class="outline-3">
<h3 id="org0c05c35">輸入當下立即驗證</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>有一些網站在你輸入帳號密碼結束時，就能直接幫你做驗證</li>
</ul>
<ul>
<li>這樣能幫助使用者得到立即反饋，更好的輸入帳號和密碼</li>
</ul>
<ul>
<li>我們現在也可以來做一個，使用正則表達式驗證（regex validators）</li>
</ul>
<ul>
<li>分別來驗證 email 和 password</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" class="fill white nobackground" style="background-image: url(images/validate-email.png)">
<hgroup class="">
<h2 class="white "><div id="outline-container-orgd8df6ed" class="outline-3">
<h3 id="orgd8df6ed"></h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-orgb7e204d" class="outline-3">
<h3 id="orgb7e204d">輸入當下立即驗證</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>我們可以建立兩個帶有 <code>:dynamic</code> 的正則驗證的變數</li>
</ul>
<ul>
<li>當使用 <code>:dynamic</code> 時，我們就不需要傳遞正則表達式到底層的驗證函數</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
;;; 4 to 8, at least one numeric digit.
(def ^:dynamic *password-re*
#"^(?=.*\d).{4,8}$")
(def ^:dynamic *email-re*
#"^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$")</pre>
</div>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org760c212" class="outline-3">
<h3 id="org760c212">輸入當下立即驗證</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>接著我們新增一個監視用戶跳離 email 與 password 輸入欄位的功能</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(defn ^:export init []
(if (and js/document
(aget js/document "getElementById"))
(let [email (by-id "email")
password (by-id "password")]
...
<b>(listen! email :blur (fn [evt] (validate-email email)))
(listen! password :blur (fn [evt] (validate-password password)))</b>)))</pre>
</div>
<ul>
<li>其中 <code>validate-email</code> 和 <code>validate-password</code> 就是我接著要實現的正則表達式的驗證函數</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-orgb34f94d" class="outline-3">
<h3 id="orgb34f94d">輸入當下立即驗證</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>接著再來建立我們的即時驗證的函數</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(defn validate-email [email]
(destroy! (by-class "email"))
(if (not (re-matches *email-re* (value email)))
(do (prepend! (by-id "loginForm") (html [:div.help.email "Wrong email"]))
false) true))
...
(defn validate-password [password]
(destroy! (by-class "password"))
(if (not (re-matches *password-re* (value password)))
(do (append! (by-id "loginForm") (html [:div.help.password "Wrong password"]))
false) true))</pre>
</div>
</article>
</slide>
</slide>
</slide>
<slide id="sec-" class=" segue dark quote nobackground" style="background-image: url(nil)">
<aside class="gdbar right bottom"><img src="images/clojurescript.png"></aside><hgroup class="">
<h2 class=" "><div id="outline-container-org6ca0642" class="outline-2">
<h2 id="org6ca0642">HTML on Top, Clojure on the Bottom</h2>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="flexbox vleft auto-fadein" id="text-">
<p>
</p>
</article>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org028f250" class="outline-3">
<h3 id="org028f250">HTML5 的新功能</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>這邊會簡單介紹一些 HTML5 的新功能，我們先看 <code>index.html</code></li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="html">
<form action="login.php" method="post" id="loginForm">
...
<input type="email" name="email" id="email"
placeholder="email"
title="Type a well-formed email!"
pattern="^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$"
required>
...</pre>
</div>
<ul>
<li>你可以發現 <code>pattern</code> 在做的事情就是我們前面有做過的驗證</li>
</ul>
<ul>
<li>我們可以把它刪掉，用 <code>domina</code> 的做法完成這件事（後略）</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-orge3c0ea0" class="outline-3">
<h3 id="orge3c0ea0">伺服器端的漸進增強改善</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>我們一直沒有處理伺服器端如何應對表單提交</li>
</ul>
<ul>
<li>其中在 <code>core.clj</code> 應該對 routes 有定義，來處理表單提交的 POST</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojure">
(ns modern-cljs.core
(:require <b>[compojure.core :refer [defroutes GET POST]] ; <- add POST</b>
[compojure.route :refer [not-found files resources]]))
...
(defroutes handler
(GET "/" [] "Hello from Compojure!") ;; for testing only
(files "/" {:root "target"}) ;; to serve static resources
<b>(POST "/login" [email password] (authenticate-user email password)) ; <- add POST route</b>
(resources "/" {:root "target"}) ;; to serve anything else
(not-found "Page Not Found")) ;; page not found</pre>
</div>
</article>
</slide>
</slide>
<slide id="sec-" class="fill white nobackground" style="background-image: url(images/authenticate-user.png)">
<hgroup class="">
<h2 class="white "><div id="outline-container-orgbd1f1bb" class="outline-3">
<h3 id="orgbd1f1bb"></h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-orgff35480" class="outline-3">
<h3 id="orgff35480">伺服器端的漸進增強改善</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>同時我們也要再開一個新檔案 <code>login.clj</code> 做和 <code>login.cljs</code> 一樣的事</li>
</ul>
<ul>
<li>讓我們在伺服器端也能驗證帳號密碼，底下只舉例 <code>authenticate-user</code> 函數：</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(defn authenticate-user [email password]
(if (or (empty? email) (empty? password))
(str "Please complete the form")
(if (and (validate-email email)
(validate-password password))
(str email " and " password
" passed the formal validation, but you still have to be authenticated"))))</pre>
</div>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org6184f4a" class="outline-3">
<h3 id="org6184f4a">伺服器端的漸進增強改善</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>並且把函數新增到 <code>core.clj</code> 在伺服器端使用</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(ns modern-cljs.core
(:require [compojure.core :refer [defroutes GET POST]]
[compojure.route :refer [not-found files resources]]
<b>[modern-cljs.login :refer [authenticate-user]]</b>))
...</pre>
</div>
<ul>
<li>你會很明顯發現 <code>login.clj</code> 的程式碼和 <code>login.cljs</code> 重複</li>
</ul>
<ul>
<li>暫且先如此，後面會解決這個問題</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" class="fill white nobackground" style="background-image: url(images/clj-and-cljs.png)">
<hgroup class="">
<h2 class="white "><div id="outline-container-orgb6ef962" class="outline-3">
<h3 id="orgb6ef962"></h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
</article>
</slide>
</slide>
</slide>
<slide id="sec-" class=" segue dark quote nobackground" style="background-image: url(nil)">
<aside class="gdbar right bottom"><img src="images/clojurescript.png"></aside><hgroup class="">
<h2 class=" "><div id="outline-container-org7bc28a4" class="outline-2">
<h2 id="org7bc28a4">Don't Repeat Yourself</h2>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="flexbox vleft auto-fadein" id="text-">
<p>
Tutorial 12
</p>
</article>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org6b9c57d" class="outline-3">
<h3 id="org6b9c57d">DRY 原則</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>前一章我們討論到使用漸進增強策略進行開發</li>
</ul>
<ul>
<li>最後我們在客戶端和伺服器端都有重複的驗證函數，這樣不行</li>
</ul>
<ul>
<li>進一步我們要討論如何遵守 <a href="https://zh.wikipedia.org/zh-tw/%E4%B8%80%E6%AC%A1%E4%B8%94%E4%BB%85%E4%B8%80%E6%AC%A1">DRY（Don't Repeat Yourself）原則</a></li>
</ul>
<article class="flexbox vcenter">
<div class="figure">
<p><img src="images/dry-apply.png" alt="dry-apply.png" width="500px" />
</p>
</div>
</article>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org76380f7" class="outline-3">
<h3 id="org76380f7">DRY 原則：驗證問題</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>如果把 DRY 原則應用到現在程式碼重複的驗證流程，代表：</li>
</ul>
<ul>
<li>1. 首先得選擇一個驗證函式庫，能在伺服器端與客戶端驗證資料</li>
</ul>
<ul>
<li>2. 接著定義在伺服器端與客戶端都能驗證的驗證集</li>
</ul>
<ul>
<li>3. 最終，我們測試我們的驗證是正確的</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org0297d2c" class="outline-3">
<h3 id="org0297d2c">選擇驗證函式庫（Validator library）</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>如果你找 Clojure 的驗證函式庫會找到很多</li>
</ul>
<ul>
<li>但是如果在 2012 年找尋 ClojureScript 的驗證函式庫，則只會找到 <a href="https://github.com/cemerick/valip">Valip</a></li>
</ul>
<blockquote>
<p>
由於 Clojure 的蓬勃發展，現在（2017）已經有許多 cljs 的驗證函式庫
</p>
</blockquote>
<ul>
<li>Valip 是 <a href="https://github.com/weavejester/valip">原本的 Valip</a> 的 Fork ，但是也可以在 ClojueScript 中使用</li>
</ul>
<ul>
<li>在本 Tutorial 中 Valip 就足夠使用，後續就以此函式庫做講解</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org7f9dbbd" class="outline-3">
<h3 id="org7f9dbbd">Valip 函數庫：validate</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<ul>
<li>讓我們開始先研究 <code>Valip</code> 函式庫有什麼功能</li>
</ul>
<ul>
<li>先認識函數 <code>validate</code> ：</li>
</ul>
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(validate {:key-1 hvalue-1 :key-2 value-2 ... :key-n value-n}
[key-1 predicate-1 error-1]
[key-2 predicate-2 error-2]
...
[key-n predicate-n error-n])</pre>
</div>
<ul>
<li>讓我們直接看個範例</li>
</ul>
</article>
</slide>
</slide>
<slide id="sec-" >
<hgroup class="">
<h2 class=" "><div id="outline-container-org081ca57" class="outline-3">
<h3 id="org081ca57">Valip 函數庫：validate</h3>
</div>
</h2>
<h3></h3>
</hgroup>
<article class="" id="text-">
<div class="org-src-container">
<pre class="prettyprint" data-lang="clojurescript">
(validate {:email "[email protected]" :password "weak1"}
[:email present? "Email can't be empty"]
[:email email-address? "Invalid email format"]
[:password present? "Password can't be empty"]
[:password (matches *re-password*) "Invalid password format"])</pre>
</div>
<ul>
<li>在這之中我們驗證 <code>:email</code> 與 <code>:password</code></li>