模板和数据的基本运作流程如下:
用户请求应用起始页面
用户的浏览器向服务器发起一次http连接,然后加载index.html页面,这个页面包含了模板
angular被加载到页面中,等待页面加载完成,查找ng-app指令,用来定义模板的边界
angular遍历模板,查找指定和绑定关系,将触发一些列动作:注册监听器、执行一些DOM操作、从服务器获取初始化数据。最后,应用将会启动起来,并将模板转换成DOM视图
连接到服务器去加载需要展示给用户的其他数据
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一种使用{{}}形式,如{{greeting}} 第二种ng-bind="greeting"
使用第一种,未被渲染的页面可能会被用户看到,index页面建议使用第二种,其余的页面可以使用第一种
表单输入
<html ng-app>
<head>
<title>表单</title>
<script type="text/javascript" src="angular.min.js"></script>
<script type="text/javascript">
function StartUpController($scope) {
$scope.funding = {startingEstimate:0};
computeNeeded = function() {
$scope.funding.needed = $scope.funding.startingEstimate * 10;
};
$scope.$watch('funding.startingEstimate',computeNeeded); //watch model的变化
}
</script>
</head>
<body>
<form ng-controller="StartUpController">
Starting: <input ng-change="computeNeeded()" ng-model="funding.startingEstimate"> //change的时候调用函数
Recommendation: {{funding.needed}}
</form>
</body>
</html>
</div>
在某些情况下,我们不想一有变化就立刻做出动作,而是要进行等待。例如:
<html ng-app>
<head>
<title>表单</title>
<script type="text/javascript" src="angular.min.js"></script>
<script type="text/javascript">
function StartUpController($scope) {
$scope.funding = {startingEstimate:0};
computeNeeded = function() {
$scope.funding.needed = $scope.funding.startingEstimate * 10;
};
$scope.$watch('funding.startingEstimate',computeNeeded);//watch监视一个表达式,当这个表达式发生变化时就会调用一个回调函数
$scope.requestFunding = function() {
window.alert("Sorry,please get more customers first.")
};
}
</script>
</head>
<body>
<form ng-submit="requestFunding()" ng-controller="StartUpController"> //ng-submit
Starting: <input ng-change="computeNeeded()" ng-model="funding.startingEstimate">
Recommendation: {{funding.needed}}
<button>Fund my startup!</button>
</form>
</body>
</html>
</div>
非表单提交型的交互,以click为例
<html ng-app>
<head>
<title>表单</title>
<script type="text/javascript" src="angular.min.js"></script>
<script type="text/javascript">
function StartUpController($scope) {
$scope.funding = {startingEstimate:0};
computeNeeded = function() {
$scope.funding.needed = $scope.funding.startingEstimate * 10;
};
$scope.$watch('funding.startingEstimate',computeNeeded);
$scope.requestFunding = function() {
window.alert("Sorry,please get more customers first.")
};
$scope.reset = function() {
$scope.funding.startingEstimate = 0;
};
}
</script>
</head>
<body>
<form ng-controller="StartUpController">
Starting: <input ng-change="computeNeeded()" ng-model="funding.startingEstimate">
Recommendation: {{funding.needed}}
<button ng-click="requestFunding()">Fund my startup!</button>
<button ng-click="reset()">Reset</button>
</form>
</body>
</html>
</div>
列表、表格以及其他迭代型元素
ng-repeat会通过$index返回当前引用的元素序号。 示例代码如下:
<html ng-app>
<head>
<title>表单</title>
<script type="text/javascript" src="angular.min.js"></script>
<script type="text/javascript">
var students = [{name:'Mary',score:10},{name:'Jerry',score:20},{name:'Jack',score:30}]
function StudentListController($scope) {
$scope.students = students;
}
</script>
</head>
<body>
<table ng-controller="StudentListController">
<tr ng-repeat='student in students'>
<td>{{$index+1}}</td>