The content of this article is about the basic introduction to angularjs. It has a certain reference value. Now I share it with you. Friends in need can refer to it.
Key points:
Front-end JS framework: It encapsulates the use of JS to develop front-end repetitive functions, extends HTML, and is mainly used for page operation and display.
Core: MVC, modularization, two-way data binding, dependency injection, semantic tags, expressions, etc. [Recommended related video tutorials: angularjs video tutorial]
Two-way data binding
Introducing related js files
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<!--引入Angularjs-->
<script type="text/javascript" src="../js/angular.min.js" ></script>
</head>
<body>
<!--匿名应用模块-->
<p ng-app="">
<input ng-model="username" name="username"/>
<input ng-model="username"/>
<p>{{username}}</p>
<p ng-bind="username"></p>
</p>
</body>
</html>Copy after login
|
##ng-app=””Anonymous application module, generally write a name to facilitate subsequent initialization
ng-model: Automatically bind the value of the
form element to the Angularjs internal variable.
ng-bind: The function is equivalent to expression, but the usage is different. Generally used to bind non-form elements and display variables.
The difference between ng-bind and {{}}: the former will replace all the contents of the tag's sub-tags with the contents of the variable, while the latter just displays the contents of the variable at the current position.
Based on modularized MVC (MVVM)
View: mainly refers to HTML static page data tags, mainly used for display.
Model: Mainly only fills in some data of the view and logical processing. For example, json, variable
control: some js code, write logic. Mainly to get the model, populate the view, get data from the view, and populate the model.
Conversion between m and vm:
For example, variables:
var username=”XiaoQi”;
$scope.username=username;
Copy after login
The variables of vm are actually bound to the properties in the global variable $scope.
On the page: {{username}}
Note: $scope cannot be added to Angularjs variables on the page.
If the variable is changed by internal js such as timer, then by default Angularjs cannot implement two-way data binding display, and $.digest needs to be used to force notification (refresh)
Example of initializing content when the page is opened:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<!--引入Angularjs-->
<script type="text/javascript" src="../js/angular.min.js" ></script>
</head>
<body>
<!--<p ng-app="myApp" ng-controller="myCtrl" ng-init="username='Jack'">-->
<p ng-app="myApp" ng-controller="myCtrl">
<input ng-model="username"/>
<p>{{username}}</p>
</p>
<!--控制器-->
<script type="text/javascript">
//初始化应用模块
//参数1：应用模块的名字
//参数2：使用扩展模块，这里没有
var myApp=angular.module("myApp",[]);
//初始化控制器：认为控制器绑定了一堆js
//参数1：控制器的名字
//参数2：js函数
myApp.controller("myCtrl",["$scope",function ($scope) {
//初始化变量
$scope.username="XiaoQi";
//可以写任何的js
}]);
</script>
</body>
</html>Copy after login
|
##Note:
If you define named application modules and controllers, you must use js initialize it!
Dependency Injection DI
##Button Event Binding
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<!--引入Angularjs-->
<script type="text/javascript" src="../js/angular.min.js" ></script>
</head>
<body>
<!--视图-->
<p ng-app="myApp" ng-controller="myCtrl">
<input ng-model="username"/>
<input type="button" value="清空数据1" ng-click="clearMsg()"/>
<input type="button" value="清空数据2" ng-click="username=''"/>
<p>Hello {{username}}</p>
</p>
<!--控制器-->
<script type="text/javascript">
//初始化应用模块
var myApp=angular.module("myApp",[]);
//初始化控制器
myApp.controller("myCtrl",["$scope",function($scope){
//初始化一个angularjs的事件
$scope.clearMsg=function(){
//清空数据
$scope.username="";
};
}]);
</script>
</body>
</html>Copy after login
| ## Repeat traversal
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<!--引入Angularjs-->
<script type="text/javascript" src="../js/angular.min.js" ></script>
</head>
<body>
<!--视图-->
<p ng-app="myApp" ng-controller="myCtrl">
<table border="1">
<tr>
<th>序号</th>
<th>商品编号</th>
<th>商品名称</th>
<th>商品价格</th>
</tr>
<tr ng-repeat="product in products">
<td>{{$index+1}}</td>
<td>{{product.id}}</td>
<td>{{product.name}}</td>
<td>{{product.price}}</td>
</tr>
</table>
</p>
<!--控制器-->
<script type="text/javascript">
angular.module("myApp",[])
.controller("myCtrl",["$scope",function($scope){
//json数组
$scope.products=[
{"id":1001,"name":"电视机","price":998},
{"id":1002,"name":"洗衣机","price":988898}
];
}])
</script>
</body>
</html>Copy after login
| product: Just write it, the temporary angularjs object during each traversal, here refers to each json object.
Routing mechanism
Before: include contains pages, which only reuse pages, but the reused pages are also refreshed as a whole.
Through angularjs routing, partial refresh can be achieved, and repeated head and tail can be realized without refreshing. And multi-view single page effect.
Underlying implementation: realized through # (anchor) in html.
Official example:
Writing: url # Sub-path (to be displayed in the middle) 
Introduce the routing module:
<!--引入路由模块-->
<script type="text/javascript" src="../js/angular-route.min.js" ></script>Copy after login
|
##<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<!--引入Angularjs-->
<script type="text/javascript" src="../js/angular.min.js" ></script>
<!--引入路由模块-->
<script type="text/javascript" src="../js/angular-route.min.js" ></script>
</head>
<body>
<p ng-app="myApp">
<p>===========我是头<br />
<a href="#/">首页</a>
<a href="#/computer">电脑分类</a>
<a href="#/money">财务管理</a>
</p>
<!--路由中的包含的页面的显示，只能有一个元素-->
<p ng-view></p>
<p>==========我是脚</p>
</p>
<!--控制器-->
<script type="text/javascript">
angular.module("myApp",['ngRoute'])
//angularjs的配置，在配置中配置路由内容
.config(['$routeProvider', function($routeProvider){
$routeProvider
//template中支持html标签
.when('/',{template:'这是<h1>首页页面</h1>'})
//.when('/computer',{template:'这是电脑分类页面'})
.when('/computer',{templateUrl:'computer.html'})
.when('/money',{template:'这是财务页面'})
//如果都匹配不上，则跳转到一个页面
.otherwise({redirectTo:'/'});
}]);
</script>
</body>
</html>Copy after login
| ng-view: used to display the content of routing results
when: the result of judgment statement
template:html, supports html tags
templateUrl: Support loading additional pages
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