angular初步认识一
最近比较流行MVC前端框架开发，最近研究了一个框架AngularJS框架
不说那么多，先上例子，我是个代码控
<!DOCTYPE html>
<html lang="en" ng-app="myApp">
<head>
<meta charset="UTF-8">
<title>capter1-angular</title>
<link rel="stylesheet" href="../css/bootstrap.min.css">
<link rel="stylesheet" href="../css/bootstrap-theme.css">
<script src="../js/angular.min.js"></script>
<script type="text/javascript">
var model = {
user:"Lifeng",
items:[{
action:"Buy Flowers",done:false
},{
action:"Get Shoes",done:false
},{
action:"Collect Tickets",done:true
},{
action:"Call Joe",done:false
}]
}
var myApp = angular.module("myApp",[]);
myApp.controller("MyCtrl",function($scope){
$scope.todo = model;
})
</script>
</head>
<body ng-controller="MyCtrl">
<div class="page-header">
<h1>{{todo.user}}'s To Do List
<span class="label label-default">{{todo.items.length}}</span>
</h1>
</div>
<div class="panel">
<div class="input-group">
<input type="text" class="form-control"/>
<span class="input-group-btn">
<button class="btn bth-default">Add</button>
</span>
</div>
<table class="table table-striped">
<thead>
<tr>
<th>Description</th>
<th>Done</th>
<th> </th>
</tr>
</thead>
<tbody>
<tr ng-repeat="item in todo.items">
<td>{{item.action}}</td>
<td><input type="checkbox" ng-model="item.done" /></td>
<td>{{item.done}}</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>
看到几个比较特殊的点
1.html标签中多一个ng-app="myApp"
2.body标签中多一个ng-controller="MyCtrl"
3.tr标签中多了ng-repeat="item in todo.items"
4.{{}}是取值表达式
5.script里面多了一些angular.module 以及myApp.controller等方法
1.根据AngularJS的解释是,一个文档中只有一个ng-app的属性，可以说是文档的唯一标识，当angular发现这个标识的时候，下面的文档树都要经过angular编译
2.ng-controller的指令就是作为前端处理业务的controller层
3.作为一个前端或者后端，看到这个就会想到是一个for遍历集合
4.不用说了，就是取元素的值
5.这个两个方法数据绑定和处理的业务逻辑。
这里还提一点，$scope是一个全局变量，还有就是数据双向绑定，里面用到了一个ng-model指令，这个自己也在学习中，希望以后学习中能够知道他们的原理。
下面可以看到$scope是全局，在对象上增加一个方法，可以在html元素上 直接使用这个方法,看标题栏，还有几个事情没有做的计数
<!DOCTYPE html>
<html lang="en" ng-app="myApp">
<head>
<meta charset="UTF-8">
<title>angularJS学习</title>
<link rel="stylesheet" href="../css/bootstrap.min.css">
<link rel="stylesheet" href="../css/bootstrap-theme.css">
<script src="../js/angular.min.js"></script>
<script type="text/javascript">
var model = {
user:"Lifeng",
items:[{
action:"Buy Flowers",done:false
},{
action:"Get Shoes",done:false
},{
action:"Collect Tickets",done:true
},{
action:"Call Joe",done:false
}]
}
var myApp = angular.module("myApp",[]);
myApp.controller("MyCtrl",function($scope){
$scope.todo = model;
$scope.incompleteCount = function(){
var _count = 0;
angular.forEach($scope.todo.items,function(item){
if(!item.done){
_count++
}
});
return _count;
}
})
</script>
</head>
<body ng-controller="MyCtrl">
<div class="page-header">
<h1>{{todo.user}}'s To Do List
<span class="label label-default" ng-hide="incompleteCount() == 0">{{incompleteCount()}}</span>
</h1>
</div>
<div class="panel">
<div class="input-group">
<input type="text" class="form-control"/>
<span class="input-group-btn">
<button class="btn bth-default">Add</button>
</span>
</div>
<table class="table table-striped">
<thead>
<tr>
<th>Description</th>
<th>Done</th>
<th> </th>
</tr>
</thead>
<tbody>
<tr ng-repeat="item in todo.items">
<td>{{item.action}}</td>
<td><input type="checkbox" ng-model="item.done" /></td>
<td>{{item.done}}</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>
自定义过滤器和发送ajax请求,写了一下代码，感觉使用挺简单，过滤器接受一个参数，list是angularJS提供的集合数据
<!DOCTYPE html>
<html lang="en" ng-app="myApp">
<head>
<meta charset="UTF-8">
<title>angularJS自定义过滤器学习</title>
<link rel="stylesheet" href="../css/bootstrap.min.css">
<link rel="stylesheet" href="../css/bootstrap-theme.css">
<script src="../js/angular.min.js"></script>
<script type="text/javascript">
var model = {
user:"Lifeng"
}
var myApp = angular.module("myApp",[]);
myApp.run(function($http){
$http.get("/angular/todo.json").success(function(data){
model.items = data;
})
});
myApp.filter("checkedItems",function(){
return function(list,showComplete){
var resultArr = [];
angular.forEach(list,function(item){
if (!item.done || showComplete ) {
resultArr.push(item);
};
});
return resultArr;
}
});
myApp.controller("MyCtrl",function($scope){
$scope.todo = model;
$scope.incompleteCount = function(){
var _count = 0;
angular.forEach($scope.todo.items,function(item){
if(!item.done){
_count++
}
});
return _count;
}
})
</script>
</head>
<body ng-controller="MyCtrl">
<div class="page-header">
<h1>{{todo.user}}'s To Do List
<span class="label label-default" ng-hide="incompleteCount() == 0">{{incompleteCount()}}</span>
</h1>
</div>
<div class="panel">
<div class="input-group">
<input type="text" class="form-control"/>
<span class="input-group-btn">
<button class="btn bth-default">Add</button>
</span>
</div>
<table class="table table-striped">
<thead>
<tr>
<th>Description</th>
<th>Done</th>
<th> </th>
</tr>
</thead>
<tbody>
<!--普通的过滤器可以像下面那样 -->
<!--<tr ng-repeat="item in todo.items | filter:{done:false}} | orderBy:'action'"> -->
<!--自定义过滤器可以像下面那样 -->
<tr ng-repeat="item in todo.items | checkedItems:showComplete | orderBy:'action'">
<td>{{item.action}}</td>
<td><input type="checkbox" ng-model="item.done" /></td>
<td>{{item.done}}</td>
</tr>
</tbody>
</table>
<div class="checkbox-inline"><label><input type="checkbox" ng-model="showComplete" />Show Complete</label></div>
</div>
</body>
</html>
再来一个好玩一点的，就是点击按钮可以天添加数据到列表中
<!DOCTYPE html>
<html lang="en" ng-app="myApp">
<head>
<meta charset="UTF-8">
<title>angularJS数据绑定学习</title>
<link rel="stylesheet" href="../css/bootstrap.min.css">
<link rel="stylesheet" href="../css/bootstrap-theme.css">
<script src="../js/angular.min.js"></script>
<script type="text/javascript">
var model = {
user:"Lifeng"
}
var myApp = angular.module("myApp",[]);
myApp.run(function($http){
$http.get("/angular/todo.json").success(function(data){
model.items = data;
})
});
myApp.filter("checkedItems",function(){
return function(list,showComplete){
var resultArr = [];
angular.forEach(list,function(item){
if (!item.done || showComplete ) {
resultArr.push(item);
};
});
return resultArr;
}
});
myApp.controller("MyCtrl",function($scope){
$scope.todo = model;
$scope.incompleteCount = function(){
var _count = 0;
angular.forEach($scope.todo.items,function(item){
if(!item.done){
_count++
}
});
return _count;
}
$scope.addNewItem = function(actionText){
$scope.todo.items.push({"action":actionText,"done":false});
}
})
</script>
</head>
<body ng-controller="MyCtrl">
<div class="page-header">
<h1>{{todo.user}}'s To Do List
<span class="label label-default" ng-hide="incompleteCount() == 0">{{incompleteCount()}}</span>
</h1>
</div>
<div class="panel">
<div class="input-group">
<input type="text" class="form-control" ng-model="actionText"/>
<span class="input-group-btn">
<button class="btn bth-default" ng-click="addNewItem(actionText)">Add</button>
</span>
</div>
<table class="table table-striped">
<thead>
<tr>
<th>Description</th>
<th>Done</th>
<th> </th>
</tr>
</thead>
<tbody>
<tr ng-repeat="item in todo.items | checkedItems:showComplete | orderBy:'action'">
<td>{{item.action}}</td>
<td><input type="checkbox" ng-model="item.done" /></td>
<td>{{item.done}}</td>
</tr>
</tbody>
</table>
<div class="checkbox-inline"><label><input type="checkbox" ng-model="showComplete" />Show Complete</label></div>
</div>
</body>
</html>
