AngularJS Phonecat example explanation

Foreword

I have read some information about AngularJS recently. There is an example of Phonecat on its official website which is very good. After looking at it for a while, I really can’t stand it. So I simply implemented it myself and looked at it from the inside when encountering problems. It’s also a good idea to look for answers. No matter how much you say or see, it’s better to do it yourself, so let’s get started.

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1. Layout

The layout is very simple. The sidebar of the homepage is an input box and a drop-down box, and the right side is a list. No major changes will be made to the homepage during implementation. Make some changes to the details page, try to simplify it, and consider adding a custom command (carousel image).

2. Architecture analysis

First think about the services you need to use.
Since what we are going to do is a single-page application, we need to serve $route and $location. Use service $resource to obtain resources. Use the service $filter to filter and sort the homepage data. To summarize:

1). The services $route and $location are responsible for routing management and jumps.
2). Service $resource is responsible for resource acquisition.
3). The service $filter is responsible for filtering and sorting data.

3. Home page and detail page view

1. Home page view

<div class="main">
  <div class="side">
    <p>
      <label>Search:</label>
      <input ng-model="filterKey" type="text" style="width:150px; ">
    </p>
    <p>
      <label>Sort by:</label>
      <select ng-model="sortKey">
        <option value="price">price</option>
        <option value="name" ng-selected="true">name</option>
      </select>
    </p>
  </div>
  <div class="content">
    <ul>
      <li ng-repeat="item in data" ng-click="$location.path(&#39;detail/&#39;+item.id)">
        <img ng-src={{item.img}}>
        <div>
          <h2>名字：{{item.name}}</h2>
          <p>性能：{{item.title}}</p>
          <p>价格：{{item.price | currency}}</p>         
        </div>
      </li>
    </ul>
  </div>
</div>

2. Details page view

<slide></slide>是一个自定义指令，实现轮播图的功能
 
<div class="detail">
  <slide links=&#39;links&#39; w=&#39;200&#39; h=&#39;200&#39;></slide>
  <div class="text">
    <h2>设备：{{data.name}}</h2>
    <p>性能：{{data.desc}}</p>
  </div>
</div>

4. Logical analysis

1. First, explain the information of the external resource infor.json. It is an array, each item of the array is a json object, containing the following fields:

{
    "id" : 1,
    "name" : "aaa",
    "title" : "bbb",
    "desc" : "ccc",
    "img" : "img/a.jpg",
    "price" : 100,
    "showList" : "[{"url":"img/b.jpg"},{"url":"img/c.jpg"}]"
}

2. Route management ($route)

m1.config(['$routeProvider',function($routeProvider){
 
  $routeProvider
    .when('/index',{
      templateUrl : 'template/index.html',
      controller : 'index'
    })
    .when('/detail/:str',{
      templateUrl : 'template/detail.html',
      controller : 'detail' 
    })
    .otherwise({
      redirectTo : '/index'
    });
 
}]);

When the shape is http://localhost/phonecat/phone.html#/index load index Template

When the shape is http://localhost/phonecat/phone.html#/detail/0, load the detail template

The default is http://localhost/phonecat/phone.html#/index

3. Home page (index ) Logical analysis

Home page resource loading:

var arr = [];
var objRe = $resource('infor.json'); 
$scope.data = arr = objRe.query(); //获得data数据后首页即可进行渲染

Filtering and sorting of home page data:

  $scope.$watch('filterKey',function(){ //监听输入框的数据变化，完成数据的筛选
    if($scope.filterKey){
      $scope.data = $filter('filter')(arr,$scope.filterKey);
    }else{
      $scope.data = arr;
    } 
  })
 
  $scope.$watch('sortKey',function(){  //监听select下拉框的数据变化，完成数据的排序
    if($scope.sortKey){
      $scope.data = $filter('orderBy')($scope.data,$scope.sortKey);
    }else{
      $scope.data = arr;
    }
  })
 
 
//这里有个需要注意的地方，我们用一个数组arr作为媒介，避免bug

Click on the list to jump to the details page:

$scope.$location = $location; //将$location挂载到$scope下，模板中便可使用$location提供的方法

Template As follows:

<li ng-repeat="item in data" ng-click="$location.path(&#39;detail/&#39;+item.id)">  --点击的时候将列表跳转到详情页

4. Logical analysis of details page

m1.controller('detail',['$scope','$resource','$location',function($scope,$resource,$location){
  var id = parseInt($location.path().substring(8));  //获取索引
  $resource('infor.json').query(function(data){
    $scope.data = data[id];
    $scope.links = eval($scope.data.showList);  //自定义指令需要用到此数据
  });
 
}]);
 
//注意：$resource.query()为异步操作。数据相关的逻辑需要在回调中完成，否则可能会出现数据undefined的情况。

5. Writing of custom specified slides

The custom specified function of AngularJS is very powerful, providing a way to achieve component-based development ideas. Let's simply implement a carousel component.

Usage example:

The template (slide.html) is as follows:

<div class="slide">
 <ul>
   <li ng-repeat="item in links">
     <img ng-src={{item.url}}>
   </li>
 </ul>
</div>

m1.directive('slide',function(){
  return {
    restrict : 'E',
    templateUrl : 'template/slide.html',
    replace : true,
    scope : {
      links : '=',
      w : '@',
      h : '@'
    },
    link : function(scope,element,attris){
      setTimeout(function(){
        var w = scope.links.length * scope.w;
        var h = scope.h;
        var iNow = 0;
 
        $(element).css({'width':scope.w,'height':h,'position':'relative','overflow':'hidden'})
        $(element).find('ul').css({'width':w,'height':h,'position':'absolute'});
        setTimeout(function(){
          $(element).find('li').css({'width':scope.w,'height':h,'float':'left'});
          $(element).find('img').css({'width':scope.w,'height':h});      
        },0);
 
        setInterval(function(){
          iNow++;
          $(element).find('ul').animate({'left':-iNow*scope.w},function(){
            if(iNow==scope.links.length-1){
              $(element).find('ul').css('left',0);
              iNow = 0; 
            } 
          });
        },1000)      
      },50)
 
    }
  } 
})

Conclusion

AngularJS provides us with many useful functions, such as routing management, data filtering, etc. More powerful functions require further exploration, and this article is only a good start.