AJAX

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2023-12-01

AngularJS 提供 $http 控件，该控件用作从服务器读取数据的服务。服务器进行数据库调用以获取所需的记录。 AngularJS需要JSON格式的数据。数据准备好后，可以使用$ http以下列方式从服务器获取数据 -

function studentController($scope,$https:) {
   var url = "data.txt";
   $https:.get(url).success( function(response) {
      $scope.students = response; 
   });
}

这里，文件data.txt包含学生记录。 $ http服务进行ajax调用并设置对其属性学生的响应。学生模型可用于在HTML中绘制表格。

例子 (Examples)

data.txt

[
   {
      "Name" : "Mahesh Parashar",
      "RollNo" : 101,
      "Percentage" : "80%"
   },
   {
      "Name" : "Dinkar Kad",
      "RollNo" : 201,
      "Percentage" : "70%"
   },
   {
      "Name" : "Robert",
      "RollNo" : 191,
      "Percentage" : "75%"
   },
   {
      "Name" : "Julian Joe",
      "RollNo" : 111,
      "Percentage" : "77%"
   }
]

testAngularJS.htm

<html>
   <head>
      <title>Angular JS Includes</title>
      <style>
         table, th , td {
            border: 1px solid grey;
            border-collapse: collapse;
            padding: 5px;
         }
         table tr:nth-child(odd) {
            background-color: #f2f2f2;
         }
         table tr:nth-child(even) {
            background-color: #ffffff;
         }
      </style>
   </head>
   <body>
      <h2>AngularJS Sample Application</h2>
      <div ng-app = "" ng-controller = "studentController">
         <table>
            <tr>
               <th>Name</th>
               <th>Roll No</th>
               <th>Percentage</th>
            </tr>
            <tr ng-repeat = "student in students">
               <td>{{ student.Name }}</td>
               <td>{{ student.RollNo }}</td>
               <td>{{ student.Percentage }}</td>
            </tr>
         </table>
      </div>
      <script>
         function studentController($scope,$http) {
            var url = "/data.txt";
            $http.get(url).then( function(response) {
               $scope.students = response.data;
            });
         }
      </script>
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js">
      </script>
   </body>
</html>