How to use it in angularJS?

This article mainly introduces some related information about the usage of angularJS. Friends who need it can refer to it

AngularJS

Event instructions:

ng-click/dblclick
ng-mousedown/up
ng-mouseenter/leave
ng-mousemove/over/out
ng-keydown/up/press
ng-focus/blur
ng-submit

Same as ng-click, both bind events to the dom

It should be noted that using event objects Sometimes, you need to pass in $event in commands such as ng-click, such as:

<button ng-click="clickFn($event)" class="btn btn-danger">aa</button>

Form command

ng-change

When the value changes Sometimes it will be useful

Some tags with value can only be used if they can be ng-model

Must be used with ng-model

Can do data verification

ng-disabled 控制元素是否可用
ng-readonly
ng-checked

Control whether the checkbox is selected

Only setting this can only control whether it is selected through data

Set ng- The model can control the data through it

The difference between disabled and readonly

Form elements can be disabled by setting the disabled or readonly attributes , after disabled is set, the user cannot use it, and the form will not submit the field. readonly

is only disabled by the user, that is, the user cannot operate, but the form will still be submitted

Countdown to rush purchase small case

$interval service is equivalent to setInterval, which can automatically perform dirty data inspection

If you want to clear it, you need to assign a value and then $interval.cancel (timer)

ng-show is displayed as true. false hide

ng-hide is true to hide. false display

ng-if is the same as ng-show, except that if it is not displayed, the node is not in the dom document

var app = angular.module("myapp",[])
app.controller("myController",function ($scope,$interval) {
$scope.num=1
$scope.canBuy = false
$scope.time = 5
  var timer = $interval(function () {
   $scope.time--;
   if($scope.time<=0){
    $scope.canBuy=true
    $interval.cancel(timer)     
   }
  },1000)
 })

ng-bind related

ng-bind has a problem. After adding it, you cannot add other things after the data variable. This tag can only display this piece of data, but not others. For example

{{name}}---111
用ng-bind-template就好
ng-bind-template="{{name}}---111"

There is another problem, the tag cannot be parsed

It’s okay, use ng-bind-html

ng-bind-html="<h1 id="name">{{name}}---111</h1>"

This will not work, this is before 1.3, it will be bigger after 1.3 During the change, in order to streamline angular.js, we removed this thing. We had to use a plug-in (module)

and we had to put "ngSanitize" in angular.module

Then you need to hang the label to be displayed on a variable, and then set it to ng-bind-html

$scope.text= "<h1 id="scope-name">"+$scope.name+"---111</h1>"
ng-bind-html=&#39;&#39;text“
ng-non-bindable

This command can prevent the expression from being parsed

<h3 id="name">{{name}}</h3>

ng -include

You can introduce an html code snippet, and you also need variables to be defined. You can also write expressions in the code snippet.

$scope.text='html/a.html';
ng-include='text'

Pay attention, because it is actually ajax inside Requested, so it needs to be in a server environment

ng-model-options='{updateOn:'blur'}'

During the display process of bound data, the node will be operated internally, and the performance is not good. You can configure it like this, and update the data displayed in the view at a certain moment. ok

AngularJS

ng-controller

You can use object-oriented thinking to write controller

<p ng-controller="myController as myFun"> 
{{name}}<br>
{{myFun.age}}<br>
{{myFun.sex}}
</p>
myapp.controller("myController",["$scope",myFun])
function myFun($scope){
 $scope.name=&#39;allen&#39;;
 this.sex=&#39;male&#39;
}
myFun.prototype.age="18"

Let’s talk about services. Services are actually already A lot has been said.

In angularJS, services are used to interact with data through certain functions

$http service

#

$http({
 url:"http://datainfo.duapp.com/shopdata/getclass.php",
 method:"get",
 params:{}
}).success(function(data){
 $scope.dataList=data;
}).error(function(error){
 console.log(error)
})

method represents the delivery method get, post

url data interface

params The submitted data is equivalent to $.ajax data: {}

success Success callback

error Error callback

Here we will talk about JSONP technology

JSONP is a cross-border solution A common way of domain problems

Cross-domain problems: Because the browser has a same-origin policy, cross-domain problems will occur when data is exchanged between different domains

Same origin policy: Data interaction can only occur under the same protocol, same domain name, and same port

Principle of JSONP: You can use the src attribute of the script tag (which will use a callback function to receive data) Not affected by the same origin policy, you can request data from different domains and receive data by setting the callback function

JSONP is Cross-domain method of combining front-end and back-end: Because the front-end requests the data and needs to use it in the callback function, the back-end has to put the data back into the callback function.

Does JSONP belong to AJAX? Ajax refers to the technology of asynchronous data interaction by using the xmlhttprequest object. JSONP is obtained by relying on the scriptsrc attribute. It does not belong to ajax.

What are the disadvantages of JSONP? What should I pay attention to when using it?

Cross-domain post processing is not allowed. It should be noted that script tags and callback functions should be dynamically created for each request and destroyed after data acquisition is completed.

If the method is jsonp, you can use jsonp to make cross-domain requests, but be careful to write the value of callback after the url as JSON_CALLBACK

Baidu search small example

The reference here is angular-sanitize.js

var app = angular.module("myapp",['ngSanitize'])
app.controller("myController",function ($scope,$http) {
  $http({   url:"http://datainfo.duapp.com/shopdata/getclass.php",
   method:"post",
   params:{a:1}
  }).success(function (results) {
   $scope.dataList = results
  }).error(function (error) {
   console.log(error)
  })
 })
 app.controller("yourController",function ($scope,$http) {
  $scope.search = function () {
   $http({    url:"https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su",
    method:"jsonp",
    params:{
     wd:$scope.wd,
     cb:'JSON_CALLBACK'
    }
   }).success(function (results) {
    $scope.dataList = results.s
   })
  }
 })

$location service

console.log($location.absUrl())//输出绝对地址
console.log($location.host())//输出域名
console.log($location.port())//输出端口
console.log($location.protocol())//协议
$location.path("aaa")//在路由中控制切换页面
console.log($location.path()) // #/aaa

$log service

Multiple console output modes

$log.info("info");
$log.warn("warn");
$log.error("error");
$log.log("log");

angularJs service provider configuration

例如

myapp.config(["$interpolateProvider",function($interpolateProvider){
 $interpolateProvider.startSymbol("!!");
 $interpolateProvider.endSymbol("!!");
}])

angular就不认识{{}}了，开始变成！！！！

自定义服务 三种

1.factory

myapp.factory('serviceName',function(){
  return ....
})

可以return 字符串、数组、函数、对象（使用最多，最和逻辑）

引入方法和angualr自带的前面加$的服务完全一样，使用方法取决于return出来的是什么东西，自定义服务的服务名还是别加$了

eq:返回一个 两个数之间的随机数的服务

myapp.factory("myService",function(){
 return {
  getRandom:function(a,b){
   return Math.random()*(b-a)+a;
  }
 }
})

自定义的服务可以依赖注入其他服务

myapp.factory('myHttpService',['$http',function($http){
   return {
     $http({
       url:......
     })      
     }
}])

eq:下一个自定义的http服务

myapp.factory("myHttpService",["$http",function($http){
  return {
    http:function(url,sfn,efn){
      $http({
        url:url,
        method:"get"
      }).success(sfn).error(efn)
    }
  }
}])
myHttpService.http("http://datainfo.duapp.com/shopdata/getclass.php",function(data){
  console.log(data)
},function(data){
  console.log(data)
})

2.provider

可以通过去自定义一个服务供应商去定义一个服务，写法有区别，服务功能性的东西需要嵌套一层返回

myapp. provider ('myHttpService',['$http',function($http){
   return {
     $get:function(){
     return:{//这里才是输出
     } 
     }
}])

外面return出来的是这个服务的供应商，供应商的$get方法里返回的才是供我们使用的部分，可以通过更改供应商的部分参数来控制服务的功能，

eq：还是返回一个范围内的随机数，但是通过配置供应商的一个值来控制服务返回的是整数还是小数

myapp.provider("myService",function(){
  return {
    isInt:true,
    $get:function(){
      var that=this;
      return {
        getRandom:function(a,b){
          var num=Math.random()*(b-a+1)+a;
          if(that.isInt){
            return Math.floor(num);
          }else{
            return(num)
          }
        }
      }
    }
  }
})
myapp.config(["myServiceProvider",function(myServiceProvider){
  myServiceProvider.isInt=false;
}])

通过这种方法创建的服务是可以配置供应商的

3.service

通过这种方法创建出来的只能是对象
最简单的创建方式，自带返回，支持面向对象的写法

myapp.service("myService",function(){
    this.getRandom=function(a,b){
      return Math.random()*(b-a)+a;
    }
})

myapp.service("myService",aaa)
function aaa(){
  this.getRandom=function(a,b){
    return Math.random()*(b-a)+a;
  }
}

多个控制器间数据的共享

实现多个控制器数据共享的方法有这样三种，

第一种比较简单，就是把数据放到父作用域上，就都可以访问了

第二种就是在控制器里通过$$prevSibling找到兄弟作用域，然后使用数据，需要注意的是，如果是初始数据类型的话就不能做数据双向绑定了

第三种是定义服务，把需要共享的数据做成服务，这样就都可以用了

<body>

  <p class="container">
    <p ng-controller="firstController">
      <input type="text" class="form-control" ng-model="name">
      <input type="text" class="form-control" ng-model="data.name">
      <input type="text" class="form-control" ng-model="Data.name">
      <p>
        first-name:{{name}}<br>
        first-data-name:{{data.name}}<br>
        first-Data-name:{{Data.name}}
      </p>

    </p>
    <p ng-controller="secondController">
      <p>
        second-name:{{name}}<br>
        second-data-name:{{data.name}}<br>
        second-Data-name:{{Data.name}}
      </p>
    </p>
  </p>
</body>
<script src="../Base/angular.min.js"></script>
<script>
  var app=angular.module("myapp",[]);
  app.factory("Data",function () {
    return {
      name:&#39;lily&#39;
    }
  })
  app.controller("firstController",function ($scope,Data) {
    $scope.name="allen";
    $scope.data={
      name:&#39;tom&#39;
    }
    $scope.Data=Data;
  })
  app.controller("secondController",function ($scope,Data) {
    $scope.name=$scope.$$prevSibling.name;
    $scope.data=$scope.$$prevSibling.data;
    $scope.Data=Data;
  })
</script>

自定义模块

所有的模块都有服务，ng-app这个模块理由￥scope什么的服务，

咱们自己也可以写一个模块，然后里面可以去写服务

这样就可以把某些服务写在某个自定义的模块里，实现重复调用

例如把随机数的例子写在一个自定义的模块里

var myModule=angular.module("myModule",[]);
myModule.service("myService",function(){
  this.ran=function(a,b){
   return Math.random()*(a+b)-a;
  }
})
var myapp=angular.module("myapp",["myModule"]);
myapp.controller("myController",["$scope","$log","myService",function($scope,$log,myService){
 $log.log(myService.ran(5,10))
}])

其实像angualr.sanitize.js就是一个自定义模块

上面是我整理给大家的，希望今后会对大家有帮助。

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