AngularJS中有关Directive的汇总

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

本篇通过几个例子对AngularJS中的Directive进行汇总。

例子1，单向绑定和双向绑定

<html ng-app="myApp">

  <head>

    <script src="angualr.js"></script>

    <script>

        (function(){

            var name = "myApp";

            requried = [];

            myApp = null;

            myApp = angualr.module(name, requires);

            myApp.controller("AppCtrl", functioin($scope){

                $scope.contacts = [

                    {firstname: "", lastname: "'},

                    ...

                ];

                $scope.addContact = function(){

                    $scope.contacts.push({firstname:"", lastname:"", isEnabled:true});

                }

                //切换视图

                $scope.viewFile = function(){

                     if($scope.viewState){

                        return "contact_list.html";

                     } else{

                        return "contact_table.html";

                     }

                }

                $scope.onPartialLoad = function(){

                    console.log($scope.viewFile() + " loaded");

                }

            })

        }());

    </script>

  </head>

  <body ng-controller="AppCtrl">

  </body>

</html>

==单向绑定

{{contacts.length}}

<div ng-bind="contacts.length"></div>

<div ng-bind-template="">the first name is {{contacts[0].firstname}}</div>

{{contacts[0].firstname}}

{{::contacts.length}} 只展示一次数组长度，当数组长度有改变，这里不变

{{ 2 + 3 }}

{{ Math.min(4, 2)}}

<button ng-click="addContact()">添加</button>

<div ng-non-bindable>this is {{hello }}</div> 这里的{{hello}}会显示出来

...

<tr ng-repeat="contact in contacts" ng-class="$odd ? 'odd':'even'">

    <td>{{$index + 1}}</td>

    <td>{{contact.firtname}}</td>

    <td>{{contact.lastname}}</td>

    <td>{{contact.isEnabled}}</td>

    <td>{{$first}}</td>

    <td>{{$last}}</td>

    <td>{{$middle}}</td>

</tr>

...

<ng-include src="'contact_table.html'"></ng-include>

//切换视图

<input type="checkbox" ng-model="viewState">切换视图

<ng-include src="viewFile()" onload="onPartialLoad()"></ng-include>

==使用Directive的几种方式

==双向绑定

例子2，ng-switch

<html ng-app="myApp">

    <head>

        angular.js

        <script>

            (function(){

                var name = "myApp[]",

                requires = [],

                myApp = null;

                myApp = angular.module(name, requires);

                myApp.controller("AppCtrl", function($scope){

                    $scope.data = {};

                });

            }());

        </script>

    </head>

    <body ng-controller="AppCtrl">

    </body>

</html>

页面部分

<div ng-repeat="channel in ['None', 'Tv', 'kitty']"  ng-cloak>

    <input type="radio" name ="leisure" value="{{channel}}" ng-model="data.whichChannel" ng-checked="$first" />{{channel}}

</div>

<div ng-switch on="data.whichChannel">

    <div ng-switch-default>this is none</div>

    <div ng-switch-when="Tv">this is tv</div>

    <div ng-switch-when="kitty">this is kitty</div>

</div>

以上，

● ng-checked 勾选
● ng-switch切换显示其中的内容
● 当点击Tv相关的这个RadioButton,把Tv这个值赋值给了data对象的whichChannel字段，whichChannel字段值得改变会告诉ng-swich所在的div，其子元素的ng-switch-when值如果和当前的whichChannel字段值匹配，就显示
● ng-cloak 避免绑定数据的时候页面闪烁

例子3，显示、隐藏、移除元素,ng-show, ng-hide, ng-if

$scope.toggleNewContact = false;

$scope.shwoNewContactForm = function(){

    $scope.toggleNewContact = true;

}

<button ng-click="showNewContactForm()">Add New Contact</button>

<form ng-show="toggleNewContact">

    <button ng-click="toggleNewContact = false">Cancel</button>

</form>

<tr ng-repeat="contact in contacts" ng-if="contact.isEnabled">

</tr>

例子4，勾选，只读，禁用，链接

$scope.checkMe = true;

$scope.url = "http://google.com";

$scope.imgSrc = "hi.jpeg";

//勾选

<input type="checkbox" ng-checked="{{checkME}}" /> check me

//禁用按钮

<button ng-disabled="{{checkMe}}">Click me</button>

//只读

<input type="text" value="he" ng-readonly="{{checkMe}}" />

//链接

<a href="{{url}}">go</a>

<a ng-href="{{url}}">go</a> 推荐使用

//图片

<img ng-src="{{imgSrc}}"/>

例子5，ng-style

<button ng-click="styles={'color':'red'}">set color</button>

<button ng-click="styles={'font-weight':'bold'}">bold</button>

<button ng-click="styles={'font-style':'italic'}>italic></button>

<p ng-style="styles">hello</p>

例子6，ng-class

.strike{
text-decoration:line-through;
}

.bold{
font-weight:bold;
}

.red{
color:red;
}

==把一个值赋值给ng-class

//文本框和controller中的style变量绑定起来
<input type="text" ng-model="style" />
<p ng-class="style">he</p>

==把一个对象赋值给ng-class

<input type="checkbox" ng-model="deleted" /> deleted
<input tyep="checkbox" ng-model="important" /> important
<input type="checkbox" ng-model="error"> error
<p ng-class="{strike:deleted, bold:important, red:error}">hello</p>

==把一个数组赋值给ng-class

//运用所有的class
<p ng-class="['strike','bold','red']">hi</p>

另外，

例子7，事件

ng-click, ng-mousedown, ng-mouseenter, ng-mouseleave, ng-mouseup

例子8，过滤

==对数组元素过滤

$scope.courses = [

    {name:"", category:"", timeline:20, price:25},

    ...

];

$scope.getTargetDate = function(days){

    var now = new Date();

    return now.setDate(now.getDate() + days);

}

<tr ng-repeat="course in courses">

    <td>{{$index + 1}}</td>

    <td>{{course.name | upplercase}}</td>

    <td>{{course.category | lowercase }}</td>

    <td>{{getTargetDate(course.timeline) | date: 'dd MMM yy' | uppercase }}</td>

    <td>{{course.price | currency: "¥" }}</td>

    <td>{{course | json}}</td>

</tr>

==对整个数组过滤

$scope.limitVal = 10;

$scope.lessThan25 = function(item){

    return item.price <;

}

{{courses.length}}

<button ng-click="limitVal = 5">5</button>

<button ng-click="limitVl = 10">10</button>

//<input type="text" ng-model="searchStr" />

//<input type="text" ng-model="name" />

//<input type="text" ng-model="category"/>

//<tr ng-repeat = "course in courses | limitTo: limitVal | filter: searchStr">

//<tr ng-repeat = "course in courses | limitTo: limitVal | filter: {name: name, category:category}">

//<tr ng-repeat = "course in courses | limitTo: limitVal | filter: lessThan25">

//<tr ng-repeat = "course in courses | limitTo: limitVal | orderBy: '-price'">

<tr ng-repeat = "course in courses | limitTo: limitVal | orderBy: ['name','-price']">

    <td>{{$index + 1}}</td>

    <td>{{course.name}}</td>

    <td>{{course.category}}</td>

    <td>{{course.timeline}}</td>

    <td>{{course.price}}</td>

</tr>