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angular初步认识一
发布时间：2023/11/27
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angular初步认识一
小编觉得挺不错的,现在分享给大家,帮大家做个参考.
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>
转载于:https://www.cnblogs.com/kevinlifeng/p/5192899.html
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