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這篇文章主要介紹了angular的scopel指令如何使用的相關知識,內容詳細易懂,操作簡單快捷,具有一定借鑒價值,相信大家閱讀完這篇angular的scopel指令如何使用文章都會有所收獲,下面我們一起來看看吧。
使用代碼如下:
<!DOCTYPEhtml><htmllang="en"><head>
<metacharset="UTF-8">
<title>Document</title>
<style>
.primary{background:red;
}</style></head><bodyng-app="myApp">
<divng-controller="mainCtrl">
<my-btn></my-btn>
</div>
<scriptsrc="node_modules/angular/angular.min.js"></script>
<script>
varmyApp=angular.module('myApp',[]);
myApp.controller('mainCtrl',['$scope',function($scope){
$scope.myClass='primary';
}]);
myApp.directive('myBtn',function(){return{
template:'<inputtype="button"value="按鈕"class="{{myClass}}">'
}
});</script></body></html>
1.png
使用自定義指令像上面一樣的確不錯,但是如果你想要對每一個指令渲染出來的按鈕定制化,則好像不可以,比如下面我們創建一堆這個自定義指令,他們長得一模一樣:
<!DOCTYPEhtml><htmllang="en"><head>
<metacharset="UTF-8">
<title>Document</title>
<style>
.primary{background:red;
}</style></head><bodyng-app="myApp">
<divng-controller="mainCtrl">
<my-btn></my-btn>
<my-btn></my-btn>
<my-btn></my-btn>
<my-btn></my-btn>
</div>
<scriptsrc="node_modules/angular/angular.min.js"></script>
<script>
varmyApp=angular.module('myApp',[]);
myApp.controller('mainCtrl',['$scope',function($scope){
$scope.myClass='primary';
}]);
myApp.directive('myBtn',function(){return{
template:'<inputtype="button"value="按鈕"class="{{myClass}}">'
}
});</script></body></html>
2.png
一種思路是把這幾個自定義的指令按鈕放到不同的控制器里面,然后控制器里通過$scope上下文傳遞不同的值:
<!DOCTYPEhtml><html><head>
<metacharset="UTF-8">
<title>Document</title>
<style>
.primary{background:red;
}.success{background:green;
}.default{background:gray;
}</style></head><bodyng-app="myApp">
<divng-controller="aCtrl">
<my-btn></my-btn>
</div>
<divng-controller="bCtrl">
<my-btn></my-btn>
</div>
<divng-controller="cCtrl">
<my-btn></my-btn>
</div>
<scriptsrc="node_modules/angular/angular.min.js"></script>
<script>
varmyApp=angular.module('myApp',[]);
myApp.controller('aCtrl',['$scope',function($scope){
$scope.myClass='primary';
}]);
myApp.controller('bCtrl',['$scope',function($scope){
$scope.myClass='success';
}]);
myApp.controller('cCtrl',['$scope',function($scope){
$scope.myClass='default';
}]);
myApp.directive('myBtn',function(){return{
template:'<inputtype="button"value="按鈕"class="{{myClass}}">'
}
});</script></body></html>
3.png
這樣寫太麻煩了,所以我們的angular為我們的自定義指令提供了一個配置項叫scope,所以,我們可以如下這樣寫:
<!DOCTYPEhtml><htmllang="en"><head>
<metacharset="UTF-8">
<title>Document</title>
<style>
.primary{background:red;
}.success{background:green;
}.default{background:gray;
}</style></head><bodyng-app="myApp">
<divng-controller="Controller">
<my-btnb="className1"></my-btn>
<my-btnb="className2"></my-btn>
<my-btnb="className3"></my-btn>
</div>
<scriptsrc="node_modules/angular/angular.min.js"></script>
<script>
varmyApp=angular.module('myApp',[]);
myApp
.controller('Controller',['$scope',function($scope){
$scope.className1='primary';
$scope.className2='success';
$scope.className3='default';
}])
.directive('myBtn',function(){return{
scope:{
a:'=b'
},
template:'<inputtype="button"value="按鈕"class="{{a}}">'
}
});</script></body></html>
要看懂上面的只要注意兩點:
這里的獨立作用域里面的a代表的是template里面的模型a
=b代表的是要angular去尋找視圖里面的當前指令的屬性b
屬性b的值需要去外部作用域里面去尋找
如果你想在指令作用域里綁定的模型的名字和外部使用的時候的屬性名一樣,可以省寫成如下:
<!DOCTYPEhtml><htmllang="en"><head>
<metacharset="UTF-8">
<title>Document</title>
<style>
.primary{background:red;
}.success{background:green;
}.default{background:gray;
}</style></head><bodyng-app="myApp">
<divng-controller="Controller">
<my-btna="className1"></my-btn>
<my-btna="className2"></my-btn>
<my-btna="className3"></my-btn>
</div>
<scriptsrc="node_modules/angular/angular.min.js"></script>
<script>
varmyApp=angular.module('myApp',[]);
myApp
.controller('Controller',['$scope',function($scope){
$scope.className1='primary';
$scope.className2='success';
$scope.className3='default';
}])
.directive('myBtn',function(){return{
scope:{
a:'='
},
template:'<inputtype="button"value="按鈕"class="{{a}}">'
}
});</script></body></html>
當然,上面的=號是雙向數據綁定:
<!DOCTYPEhtml><htmllang="en"><head>
<metacharset="UTF-8">
<title>Document</title>
<style>
.primary{background:red;
}.success{background:green;
}.default{background:gray;
}</style></head><bodyng-app="myApp">
<divng-controller="Controller">
<my-btna="abc"></my-btn>
</div>
<scriptsrc="node_modules/angular/angular.min.js"></script>
<script>
varmyApp=angular.module('myApp',[]);
myApp
.controller('Controller',['$scope',function($scope){
$scope.abc='我是初始內容';
}])
.directive('myBtn',function(){return{
scope:{
a:'='
},
template:'<inputtype="text"ng-model="a"><span>{{a}}</span>'
}
});</script></body></html>
如果只是想單向的數據通信,可以用@符號:
<!DOCTYPEhtml><htmllang="en"><head>
<metacharset="UTF-8">
<title>Document</title>
<style>
.primary{background:red;
}.success{background:red;
}.default{background:red;
}</style></head><bodyng-app="myApp">
<divng-controller="Controller">
<my-btna="primary"></my-btn>
</div>
<scriptsrc="node_modules/angular/angular.min.js"></script>
<script>
varmyApp=angular.module('myApp',[]);
myApp
.controller('Controller',['$scope',function($scope){
$scope.mm='primary';
}])
.directive('myBtn',function(){return{
scope:{
a:'@'
},
template:'<inputtype="button"value="按鈕"class="{{a}}">'
}
});</script></body></html>
如果想用ng-class,也是可以的:
<!DOCTYPEhtml><htmllang="en"><head>
<metacharset="UTF-8">
<title>Document</title>
<style>
.primary{background:red;
}.success{background:red;
}.default{background:red;
}</style></head><bodyng-app="myApp">
<divng-controller="Controller">
<my-btna="primary"></my-btn>
</div>
<scriptsrc="node_modules/angular/angular.min.js"></script>
<script>
varmyApp=angular.module('myApp',[]);
myApp
.controller('Controller',['$scope',function($scope){
$scope.mm=true;
}])
.directive('myBtn',function(){return{
scope:{
a:'@'
},
template:'<inputtype="button"value="按鈕"ng-class="{primary:a}">'
}
});</script></body></html>
最后,還有一個scope可以設置是引用外部作用域的方法
<!DOCTYPEhtml><htmllang="en"><head>
<metacharset="UTF-8">
<title>Document</title>
<style>
.primary{background:red;
}.success{background:red;
}.default{background:red;
}</style></head><bodyng-app="myApp">
<divng-controller="Controller">
<my-btnfn2="fn()"></my-btn>
</div>
<scriptsrc="node_modules/angular/angular.min.js"></script>
<script>
varmyApp=angular.module('myApp',[]);
myApp
.controller('Controller',['$scope',function($scope){
$scope.fn=function(){
alert(11);
}
}])
.directive('myBtn',function(){return{
scope:{
fn1:'&fn2'
},
template:'<inputtype="button"value="按鈕"ng-click="fn1()">'
}
});</script></body></html>
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