AngularJS – Tab 介紹篇
為了方便文章閱讀,本篇將Tab翻譯成頁籤
這個案例的複雜度會比較前面高一些,因為它不僅僅是使用我們一直提到的AngularJS,為了要製作頁面上面的一些互動效果,還加入了Bootstrape這個通常被用來當RWD的框架,不過也僅僅是套用了幾個類別,所以大家也不用太擔心,接下來我們先看一下這個案例最後希望要達成的效果頁面。
在看過了目標頁面後,我們先來了解一下需要怎麼樣架構我們的HTML,首先是CSS和Javascript的引入,分別是AngularJS、jQuery、Bootstrap CSS以及Javascript:
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script> <script src="https://code.jquery.com/jquery.min.js"></script> <link href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet" type="text/css" /> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
在HTML文件中,必須有項目清單標籤ul、li,而在ul標籤中需套用nav nav-pills這兩個css類別,這兩個類別是由Bootstrape的css所提供的,li標籤是包覆著超連結的a標籤,下圖案例是希望可以產生三個頁籤。
在a標籤中加入ng-click=”tab = 1″、ng-click=”tab = 2″、ng-click=”tab = 3″去設定當使用者按下連結後tab變數會隨著變化,另外為了方便觀察是否成功,在頁面上利用表達式將tab變數顯示出來。
若一切順利,在我們按下不同的頁籤連結時,畫面上應該會有數字上面的變化。
接下來開始製作點選頁籤後的內容頁面,同樣的內容頁面也應該有三個才對,在HTML中產生三個div,其中套用Bootstrape所提供的CSS panel類別,div的內容部分可依照需求置入。
在div中利用ng-show去判斷tab變數的值來切換顯示。
完成後,在我們點選不同的連結時,內容的部分也應該會隨著變動。
接下來我們在section標籤中設定ng-init=”tab=1″的屬性來決定tab變數的初始值。
接下來在li內新增ng-class的屬性,依tab變數的值來切換active的CSS屬性(該屬性由Bootstrape提供樣式),其中三個連續的等號是判斷該變數與值完全相同的意思。
這個動作的目的是希望當網友點選之後,可以如下圖所示,清楚的標示目前頁面上所顯示的是第幾個項目。
到目前為止,大概就完成了我們希望呈現的頁籤效果,大家可以透過JS Bin來測試看看到目前為止的程式碼。
<!DOCTYPE html> <html ng-app> <head> <meta name="description" content="AngularJS Tabs Example 1"> <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script> <script src="//code.jquery.com/jquery.min.js"></script> <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet" type="text/css" /> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script> <meta charset="utf-8"> <title>AngularJS Tabs Example 1</title> </head> <body> <section ng-init="tab=1"> <ul class="nav nav-pills"> <li ng-class="{ active: tab===1 }"> <a href="" ng-click="tab=1">滑鼠墊</a> </li> <li ng-class="{ active: tab===2 }"> <a href="" ng-click="tab=2">馬克杯</a> </li> <li ng-class="{ active: tab===3 }"> <a href="" ng-click="tab=3">杯墊</a> </li> </ul> <div class="panel" ng-show="tab===1"> <h4>馬老師雲端研究室 滑鼠墊</h4> <p>產品介紹...</p> </div> <div class="panel" ng-show="tab===2"> <h4>馬老師雲端研究室 馬克杯</h4> <p>產品介紹...</p> </div> <div class="panel" ng-show="tab===3"> <h4>馬老師雲端研究室 杯墊</h4> <p>產品介紹...</p> </div> </section> </body> </html>
在看完了上面的案例之後,我們可以觀察到程式邏輯判斷的部分都是直接撰寫在HTML頁面上,那如果我們要把邏輯判斷的部分從HTML拆開寫到Javascript檔又應該要如何處理呢?首先,不用說的當然是必須要有應用程式的建立以及控制器囉!下圖中我們開始新增控制器,並且在section標籤中,輸入ng-controller=”panelController as panel”的屬性,相信在看了前幾篇教學的同學們對於這樣的項目是再熟悉不過了!接下來在控制器中,決定tab變數的初始值,就可以把原來的ng-init屬性刪除了。
在ng-click後去執行控制器中的selectTab函數,並且針對該函數帶入不同的值,利用帶入的值來改變tab變數值。
在ng-click後去執行控制器中的isSelected函數,也帶出不同的值給函數,讓函數可以回傳tab===1或2、3這樣的內容給ng-show使用。
這樣一來我們邏輯判斷的部分就會和網頁內容有所區隔,大家也可以透過JS Bin來測試這樣的程式結構。
<!DOCTYPE html> <html ng-app="store"> <head> <meta name="description" content="AngularJS Tabs Example 2"> <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script> <script src="//code.jquery.com/jquery.min.js"></script> <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet" type="text/css" /> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script> <meta charset="utf-8"> <title>AngularJS Tabs Example 2</title> </head> <body> <section ng-controller="PanelController as panel"> <ul class="nav nav-pills"> <li ng-class="{ active: panel.isSelected(1) }"> <a href="" ng-click="panel.selectTab(1)">滑鼠墊</a> </li> <li ng-class="{ active: panel.isSelected(2) }"> <a href="" ng-click="panel.selectTab(2)">馬克杯</a> </li> <li ng-class="{ active: panel.isSelected(3) }"> <a href="" ng-click="panel.selectTab(3)">杯墊</a> </li> </ul> <div class="panel" ng-show="panel.isSelected(1)"> <h4>馬老師雲端研究室 滑鼠墊</h4> <p>產品介紹...</p> </div> <div class="panel" ng-show="panel.isSelected(2)"> <h4>馬老師雲端研究室 馬克杯</h4> <p>產品介紹...</p> </div> <div class="panel" ng-show="panel.isSelected(3)"> <h4>馬老師雲端研究室 杯墊</h4> <p>產品介紹...</p> </div> </section> </body> </html>
(function(){ var app = angular.module('store', []); app.controller('PanelController', function(){ this.tab = 1; this.selectTab = function(setTab){ this.tab = setTab; }; this.isSelected = function(checkTab){ return this.tab === checkTab; }; }); })();
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Carrie Underwood slated to perform at Trump’s inauguration
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Country music star Carrie Underwood is slated to perform “America the Beautiful” at President-elect Donald Trump’s inauguration, according to a copy of the program obtained by CNN and confirmed by a spokesperson for the inaugural committee.
“I love our country and am honored to have been asked to sing at the Inauguration and to be a small part of this historic event,” Underwood said in a statement to CNN. “I am humbled to answer the call at a time when we must all come together in the spirit of unity and looking to the future.”
The presidential oath of office will be administered by Supreme Court Chief Justice John Roberts with Justice Brett Kavanaugh expected to administer the oath of office to Vice President-elect JD Vance.
Trump’s inauguration as the 47th president of the United States will take place on January 20 at the US Capitol.
Underwood is a big get for Trump’s inauguration, considering Hollywood’s Trump blackout over the course of his political career.
In his first term and throughout the past three elections, Trump has struggled to garner support from major Hollywood stars. At the Republican National Convention last year, the two biggest stars onstage with Trump were musician Kid Rock and retired WWE wrestler Hulk Hogan – a far cry from a superstar at the height of their career, like Underwood.
The Grammy-winning artist is as high-profile as you can get in country music, not only with numerous platinum hits, but also with public-facing, mainstream business associations. Underwood is the face of Sunday Night Football and is set to make her debut this March as a judge on ABC’s “American Idol” – the singing competition show that catapulted her to fame when she won in 2005.
While many NFL fans will likely applaud Underwood for singing at the inauguration, any time a celebrity aligns themselves with Trump, they run the risk of alienating left-leaning fans and Hollywood allies.
Underwood has kept her politics under wraps over the course of her career. In her statement, she did not mention Trump by name and kept her focus on unifying the country – still, Underwood’s decision to publicly align with Trump is a big statement for any star, particularly one as private as the singer.
Historically, Hollywood has always been closely associated with the Democratic Party, but country stars have always been an outlier, leaning more conservative. In recent years, as new singers join the genre, country music has gotten to be more progressive. This past election cycle, country stars like Mickey Guyton and Maren Morris stood with Vice President Kamala Harris.
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A brief history of sunglasses, from Ancient Rome to Hollywood
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Sunglasses, or dark glasses, have always guarded against strong sunlight, but is there more to “shades” than we think?
The pupils of our eyes are delicate and react immediately to strong lights. Protecting them against light — even the brilliance reflected off snow — is important for everyone. Himalayan mountaineers wear goggles for this exact purpose.
Protection is partly the function of sunglasses. But dark or colored lens glasses have become fashion accessories and personal signature items. Think of the vast and famous collector of sunglasses Elton John, with his pink lensed heart-shaped extravaganzas and many others.
When did this interest in protecting the eyes begin, and at what point did dark glasses become a social statement as well as physical protection?
The Roman Emperor Nero is reported as holding polished gemstones to his eyes for sun protection as he watched fighting gladiators.
We know Canadian far north Copper Inuit and Alaskan Yupik wore snow goggles of many kinds made of antlers or whalebone and with tiny horizontal slits. Wearers looked through these and they were protected against the snow’s brilliant light when hunting. At the same time the very narrow eye holes helped them to focus on their prey.
In 12th-century China, judges wore sunglasses with smoked quartz lenses to hide their facial expressions — perhaps to retain their dignity or not convey emotions.
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