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Some usages of angularJS

小云云

Dec 12, 2017 am 10:33 AM

angularjs javascript

AngularJS is an excellent front-end JS framework that has been used in many Google products. AngularJS has many features, the most core of which are: MVC, modularization, automated two-way data binding, semantic tags, dependency injection, etc. This article mainly introduces some relevant information about the usage of angularJS. Friends who need it can refer to it. I hope it can help everyone.

AngularJS

##Event directive:

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

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Like ng-click, they are bound events to the dom

It should be noted that when using the event object, you need to include instructions such as ng-click Pass in $event, such as:

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

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##Form command

ng-change

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It will be useful when the value changes

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

Must be used with ng-model

can be used for data verification##

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

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Control Whether the checkbox is selected

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

Set ng-model and you 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, users cannot use it. And the form will not submit this field, readonly

is only disabled by the user, that is to say, 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 check dirty data.

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)
 })

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ng-bind related

There is a problem with ng-bind. After adding it, you cannot add anything else after the data variable. This tag can only Displaying this data, other data will not work, such as

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

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There is another problem, the tag cannot be parsed

It’s okay, use ng-bind -html

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

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This is not okay. This is before 1.3. During the major overhaul after 1.3, in order to streamline angular.js, this thing was given to After getting it out, you have to use a plug-in (module)

You also have to put "ngSanitize" in angular.module

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

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

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This directive can prevent the expression from parsing

<h3 ng-non-bindable>{{name}}</h3>

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ng-include

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

$scope.text=&#39;html/a.html&#39;;
ng-include=&#39;text&#39;

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Note that because the internal request is ajax, it requires a server environment

ng-model-options=&#39;{updateOn:&#39;blur&#39;}&#39;

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

AngularJS

ng-controller

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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"

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Let’s talk about service. Service has actually said a lot.

In angularJS, services are used to process data through certain functions

$http service

Interaction

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

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method represents the delivery method get, post

url data interface

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

success success callback

error error callback

Here we will talk about JSONP technology

JSONP is a common way to solve cross-domain problems

Cross-domain problem: Because the browser has a same-origin policy, when different domains Cross-domain problems will occur when data are exchanged between them.

Same-origin policy: Data interaction can only be carried out under the same protocol, same domain name, and same port.

Principle of JSONP: Yes The src attribute of the script tag (which uses a callback function to receive data) is not affected by the same-origin policy. You can request data from different domains and receive it by setting the callback function

Data

JSONP is a cross-domain method that combines 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

JSONP属于AJAX吗？ajax是指通过使用xmlhttprequest对象进行异步数据交互的技术，jsonp是依靠scriptsrc属性来获取的，不属于ajax

JSONP有什么缺点，使用的时候需要注意什么？

不能post跨域处理，需要注意的是：每次请求应该动态的创建script标签和回调函数，数据获取完成后销毁。

如果method是jsonp的话，就可以用jsonp去跨域请求，但是注意要在url后写关于callback的值为JSON_CALLBACK

百度搜索小例子

这里引用的是 angular-sanitize.js

var app = angular.module("myapp",[&#39;ngSanitize&#39;])
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:&#39;JSON_CALLBACK&#39;
    }
   }).success(function (results) {
    $scope.dataList = results.s
   })
  }
 })

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$location服务

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

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$log 服务

多种控制台输出模式

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

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angularJs对服务供应商配置

例如

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

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angular就不认识{{}}了，开始变成！！！！

自定义服务三种

1.factory

myapp.factory(&#39;serviceName&#39;,function(){
  return ....
})

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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;
  }
 }
})

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自定义的服务可以依赖注入其他服务

myapp.factory(&#39;myHttpService&#39;,[&#39;$http&#39;,function($http){
   return {
     $http({
       url:......
     })      
     }
}])

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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)
})

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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 (&#39;myHttpService&#39;,[&#39;$http&#39;,function($http){
   return {
     $get:function(){
     return:{//这里才是输出
     } 
     }
}])

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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;
}])

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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;
  }
}

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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>

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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))
}])

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其实像angualr.sanitize.js就是一个自定义模块

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