AngularJS – 跟著Google玩網頁！
今天馬老師要與大家分享的是一個前端開發的函式庫AngularJS，前面的文章中都有提到，因為近年來行動裝置的普及讓Javascript大為活躍，不過傳統的Javascript在相容性上、操作上都非常的不方便，所以才有了許許多多Javascript的函式庫與框架的誕生，例如：jQuery、KnockoutJS、GSAP、PaperJS…等，每個Javascript的函式庫和框架的大小、作用和目的都不盡相同，有的是為了特效；有的則是為了方便操作，那今天為何要跟大家分享AngularJS呢？因為…它是名牌！
為何說AngularJS是名牌呢？因為目前他是由Google來負責維護。初始版本是在2009年誕生的，比jQuery晚了三年，言下之意就會比jQuery好嗎？當然也不能這麼說，jQuery在目前還是一個非常火燙的前端開發函式庫，應該要說他們兩個在使用的架構和目的上會有所不同，這篇文章也來比較一下同樣的案例，在兩種語法上面撰寫的不同。
不過首先我們要知道基本的AngularJS開發方式，今天的案例我們利用JS Bin的線上開發網頁來說明，大家也可以到這個平台上來試著玩看看！如果需要利用AngularJS開發自己的網頁，也可以到AngularJS的官方網頁把JS下載到資料夾之後引用到網頁裡。
1. 首先點選Add library後選擇AngularJS Stable，這樣該平台就會加入AngularJS的函式庫進入頁面。
2. 在標籤中，加入ng-app的屬性，讓整份文件都可以使用AngularJS。
3. 接下來就可以在左手邊body標籤內開始輸入一些程式碼來測試，AngularJS在輸出方面有個基本的結構式「{{ }}」，大家輸入以下的程式碼來測試看看結果：
<!DOCTYPE html>
<html ng-app>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<p>{{ '馬老師雲端研究室' }}</p>
<p>35+62={{ 35+62 }}</p>
<p>NT{{ 62000 | currency }}</p>
</body>
</html>
可以看到輸出的結果應該是：（在JS Bin上面看AngularJS輸出結果）
馬老師雲端研究室 35+62=97 NT$62,000.00
同樣的如果我們要利用jQuery來完成這樣的頁面，程式碼就會變成：（在JS Bin上面看jQuery輸出結果）
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/numeral.js/1.4.5/numeral.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<p></p>
<p></p>
<p></p>
</body>
</html>
<script>
$("p:eq(0)").text('馬老師雲端研究室')
$("p:eq(1)").text('35+62=' + (35 + 62))
$("p:eq(2)").text('NT' + (numeral(62000).format('$ 0,0.00')))
</script>
請注意，為了要完成第三項貨幣型式的呈現，我們還必須去引用這個網站的jQuery Plugin才有辦法比較輕鬆的實現。從上面的案例可以看的出來jQuery是由HTML DOM來抓到對象，再針對對象做操作，而AngularJS不管顯示的效果為何，就是在需要有程式運算的地方出現，所以AngularJS也被稱為符合MVC結構的Javascript函式庫（MVC是一種寫程式的結構，全名是Model View Controller，大家可以上網Google就可以查到很多與MVC相關的資料），但如果你有進入官網，可以看到官網上他的標題是「AngularJS – Superheroic JavaScript MVW Framework」，翻譯成中文大概是「AngularJS是一個符合MV…Whatever什麼什麼隨便啦！的超級函式庫」，可以看出Google的惡搞功夫。
再來示範第二個案例，本案例利用購物行為來製作相關的頁面讓大家參考，程式碼如下：
<!DOCTYPE html>
<html ng-app>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body ng-init="stock=120;price=325;quantity=1;total=0">
<p>馬老師雲端研究室 滑鼠墊</p>
<p>剩餘：<span ng-model="stock">{{ stock-quantity }}</span>個</p>
<p>單價：<span ng-model="price">{{ price | currency:"NT$":0 }}</span>元</p>
<p>數量：<input type="number" min="0" max="{{ stock }}" ng-model="quantity"></p>
<p>總金額：<span ng-model="total">{{ price*quantity | currency:"NT$":0 }}</span></p>
</body>
</html>
輸出結果：（在JS Bin上面看AngularJS輸出結果）
在這個案例裡面有四個項目，分別是商品剩餘數量、單價、數量、總金額，使用者唯一可以改變的只有數量，但頁面中會自動運算剩餘數量和總金額，其中在語法body標籤中，加上了ng-init屬性，代表設定這幾個項目的預設值，stock（剩餘數量）120個、price（單價）325元、quantity（數量）1個，total（總金額）325元。接下來在span內的ng-model就是去綁定該定義項目，{{ }}則是顯示該項目或運算結果，另外貨幣格式的部分，也是用了一些設定讓貨幣在這個案例裡面顯示得更為接近台幣格式，另外還是用HTML5 input標籤的min和max來限制欄位內的值。 而這個案例如果轉換為jQuery的寫法，大概會是下面這樣子：（在JS Bin上面看jQuery輸出結果）
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/numeral.js/1.4.5/numeral.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<p>馬老師雲端研究室 滑鼠墊</p>
<p>剩餘：<span id="stock"></span>個</p>
<p>單價：<span id="price"></span>元</p>
<p>數量：<input type="number" min="0" ng-model="quantity" id="quantity"></p>
<p>總金額：<span id="total"></span>元</p>
</body>
</html>
<script>
var stock = 120;
var price = 325;
var quantity = 1;
var total = 325;
$("#stock").text(stock) $("#price").text('NT' + (numeral(price).format('$ 0,0'))) $("#quantity").val(quantity).attr(
"max", stock) $("#total").text('NT' + (numeral(total).format('$ 0,0'))) $("#quantity").change(function () {
quantity = $(this).val() newstock = stock - $(this).val() total = price * $(this).val() $("#stock").text(
newstock) $("#price").text('NT' + (numeral(price).format('$ 0,0'))) $("#total").text('NT' + (
numeral(total).format('$ 0,0')))
})
</script>
後記：以上兩個案例示範的是jQuery和AngularJS在撰寫頁面的不同，不過因為這篇文章原本就是要以AngularJS為主，所以挑的案例當然會是AngularJS比較佔優勢的內容，還是跟我常說的一樣，做不同的東西就要用不同的工具，用錯了工具不是做不到，但可能是會事倍功半的！另外文章中的程式碼，都是嵌入遠端的JS檔，所以也可以把整個程式碼複製到你熟悉的網頁開發軟體內，一樣會看到同樣的結果喔！
Although some would disagree and level to 鈥?0s bands like Led Zeppelin, no one can dispute that Iron Maiden and Judas Priest gave main rise to the style.
Whip up a raw tomato garnish by chopping a couple of chilled tomatoes and adding a shallot (a relative to the onion, only smaller and with a milder flavor).
You wish to get an idea of what’s out there and what the whole lot will value, particularly if you’ve got never purchased bath fixtures or have not finished so for many years.
There’s definately a lot to learn about this subject.
I love all the points you made.
My web page; reviews on lung clear pro
So, consumers have numerous freedom in regards to select and choose.
But within the eyes of many researchers, the important thing to finding a hair loss therapy is finding out its trigger.
This is the perfect webpage for anybody who wishes to understand this topic. You understand so much its almost tough to argue with you (not that I really will need to…HaHa). You certainly put a new spin on a subject that’s been written about for decades. Excellent stuff, just wonderful.
The Information Star Catalog (GSC), additionally recognized because the Hubble House Telescope, Guide Catalog (HSTGC), is a star catalog compiled to support the Hubble Space Telescope with focusing on off-axis stars.
I always spent my half an hour to read this webpage’s articles all the time along with a cup of coffee.
my blog post: what is genius wave
Nice post. I was checking continuously this blog and I am impressed!
Extremely helpful info specially the last part 🙂 I care for such information a lot.
I was looking for this certain info for a long time.
Thank you and best of luck.
Here is my web blog … free sugar pro drops
The dual-clutch automated operates by way of two clutches, that are controlled by the automotive’s laptop network and require no input from the driver.
I could not refrain from commenting. Perfectly written!
Here is my homepage … is zencortex a scam
Excellent blog you have here but I was curious about if you knew of any forums that cover the same topics
discussed here? I’d really love to be a part of community where I can get feed-back from other
knowledgeable individuals that share the same interest. If you have any suggestions, please let me know.
Many thanks!
Feel free to visit my page … is free sugar pro a scam
To participate within the Disney Lightsaber Construct experience, guests are required to make reservations in advance.
While on approach the tour guide will explain all the pieces about the deserts and the surrounding areas.
I’d like to thank you for the efforts you’ve put
in penning this blog. I am hoping to check out the same high-grade
blog posts from you later on as well. In truth, your creative writing abilities has encouraged me to get my own, personal site now 😉
My web-site: item681595570
You made some good points there. I checked on the net to learn more about the issue and found most people will go along with your views on this web site.
Introducing to you the most prestigious online entertainment address today. Visit now to experience now!
Introducing to you the most prestigious online entertainment address today. Visit now to experience now!
Oh my goodness! Incredible article dude! Thanks, However I am encountering issues with your RSS. I don’t understand why I cannot subscribe to it. Is there anyone else having identical RSS issues? Anyone who knows the solution will you kindly respond? Thanks.
Introducing to you the most prestigious online entertainment address today. Visit now to experience now!
Introducing to you the most prestigious online entertainment address today. Visit now to experience now!
Introducing to you the most prestigious online entertainment address today. Visit now to experience now!
Thanks a bunch for sharing this with all of us you really recognize what you’re talking approximately!
Bookmarked. Kindly additionally discuss with my website =).
We can have a hyperlink alternate arrangement between us
Take a look at my website :: fitspresso
The Minister of the Funds can’t appoint or dismiss both an assessor or a collector; the Minister of the Inside, not one of many departmental, district, or communal directors; the Minister of Justice, not one decide or public prosecutor.
May I just say what a comfort to uncover somebody who actually knows what they are talking about online. You definitely know how to bring an issue to light and make it important. More people have to look at this and understand this side of your story. I was surprised you aren’t more popular since you surely have the gift.
I go to see each day a few sites and websites to read posts, except this
webpage gives feature based posts.
Also visit my site – does testoprime work reddit
Pretty! This was an incredibly wonderful post. Many thanks for supplying these details.
When I originally left a comment I appear to have clicked the -Notify me when new comments are added- checkbox and from now on every time a comment is added I receive four emails with the same comment. Perhaps there is a way you can remove me from that service? Thanks a lot.
Hi there! This is my first visit to your blog! We are a collection of volunteers and starting
a new initiative in a community in the same niche. Your
blog provided us useful information to work on. You have done a outstanding job!
My website; leanbiome.com