AngularJS service之select下拉菜单效果

本文实例为大家分享了service之select下拉菜单效果的具体代码，供大家参考，具体内容如下

<!-- $watch：持续监听数据上的变化，更新界面 -->
<!DOCTYPE html>
<html lang="en" ng-app="myApp" ng-controller="myCtrl">
 <head>
  <meta charset="utf-8">
  <script src="js/angular.js"></script>
 </head>
 <body>
  使用ng-options
  <select ng-model=names[0] ng-options="x for x in names">

  </select><br>

  使用ng-repeat
  <select>
   <option ng-repeat="x in names">{{x}}</option>
  </select><br><br>

   区别<br>
   ng-options更适合来做下拉菜单<br>
   为什么这么说？<br><br><br>
  <div style="color: red">使用ng-repeat操作数组</div><br>
  <select ng-model="selectedSite">
   <option ng-repeat="x in sites" value="{{x.url}}">{{x.site}}</option>

  </select><br>
  <h1>你选择的是: {{selectedSite}}</h1><br>

  <div style="color: red">使用ng-options操作数组</div><br>
  <select ng-model="selectedSite2" ng-options="x.site for x in sites">

  </select><br>
  <h1>你选择的是: {{selectedSite2.site}}</h1><br>
  <p>网址为: {{selectedSite2.url}}</p><br><br>
  看得出，ng-options操作的是对象 而ng-repeat操作的是字符串
  当选择值是一个对象时，我们就可以获取更多信息，应用也更灵活。<br><br><br><br>

  <div style="color: red">使用ng-options来操作对象</div>
  <select ng-model="selectedSite3" ng-options="x for (x, y) in sites2">
  </select><br>
  <h1>你选择的值是: {{selectedSite3}}</h1><br><br><br><br>

  <p>选择一辆车:</p><br>

  <select ng-model="selectedCar" ng-options="x for (x, y) in cars">
  </select><br>

  <h1>你选择的是: {{selectedCar.brand}}</h1><br>
  <h2>模型: {{selectedCar.model}}</h2><br>
  <h3>颜色: {{selectedCar.color}}</h3><br>

  <p>注意选中的值是一个对象。</p>

 </body>
 <script>
  var app = angular.module('myApp', []);
  app.controller('myCtrl', function($scope) {
   $scope.names = ["Google", "Runoob", "Taobao"];
   $scope.sites = [
      {site : "Google", url : "http://www.google.com"},
      {site : "Runoob", url : "http://www.runoob.com"},
      {site : "Taobao", url : "http://www.taobao.com"}
      ];
   $scope.sites2 = {
      site01 : "Google",
      site02 : "Runoob",
      site03 : "Taobao"
      };
   $scope.cars = {
      car01 : {brand : "Ford", model : "Mustang", color : "red"},
      car02 : {brand : "Fiat", model : "500", color : "white"},
      car03 : {brand : "Volvo", model : "XC90", color : "black"}
      }
  });
</script>
</html>

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