AngularJS指令不起作用的基本问题
我有以下html:AngularJS指令不起作用的基本问题,angularjs,angularjs-directive,angularjs-scope,Angularjs,Angularjs Directive,Angularjs Scope,我有以下html: <!doctype html> <html lang="en" ng-app="myApp"> <head> <meta charset="utf-8"> <title>My AngularJS App</title> <link rel="stylesheet" href="css/app.css"/> </head> <body> <
<!doctype html>
<html lang="en" ng-app="myApp">
<head>
<meta charset="utf-8">
<title>My AngularJS App</title>
<link rel="stylesheet" href="css/app.css"/>
</head>
<body>
<div ng-controller="myCtrl">
<cmp>
<enhanced-textarea ng-model="name"></enhanced-textarea>
<h3>{{name}}</h3>
<notice></notice>
</cmp>
</div>
<script src="lib/angular/angular.js"></script>
<script src="js/directives.js"></script>
<script src="js/controllers.js"></script>
<script src="js/app.js"></script>
</body>
</html>
'use strict';
angular.module('myApp', [
'myApp.directives',
'myApp.controllers'
]);
'use strict';
angular.module('myApp.controllers', [])
.controller('myCtrl', ['$scope', function($scope) {
$scope.name = 'test';
}]);
'use strict';
angular.module('myApp.directives', [])
.directive('cmp', function () {
return {
restrict: 'E',
controller: 'cmpCtrl',
replace: true,
transclude: true,
scope: {
name: '='
},
template: '<div ng-transclude></div>'
};
})
.controller('cmpCtrl', ['$scope', '$element', '$attrs' , function ($scope, $element, $attrs) {
$scope.$parent.$watch('name', function (newVal) {
if (newVal) {
$scope.$parent.updatedSize = newVal.length;
console.log(newVal.length);
}
}, true);
}])
.directive('enhancedTextarea', function () {
return {
restrict: 'E',
replace: true,
transclude: true,
template: '<textarea ng-transclude></textarea>'
};
})
.directive('notice', function () {
return {
restrict: 'E',
require: '^cmp',
replace: true,
scope: {
updatedSize: '='
},
template: '<div>{{size}}</div>',
link: function ($scope, $element, $attrs, cmpCtrl) {
console.log(cmpCtrl);
$scope.$parent.$watch('updatedSize', function (newVal) {
if (newVal) {
$scope.size = newVal;
}
}, true);
}
};
});
这里是controllers.js:
<!doctype html>
<html lang="en" ng-app="myApp">
<head>
<meta charset="utf-8">
<title>My AngularJS App</title>
<link rel="stylesheet" href="css/app.css"/>
</head>
<body>
<div ng-controller="myCtrl">
<cmp>
<enhanced-textarea ng-model="name"></enhanced-textarea>
<h3>{{name}}</h3>
<notice></notice>
</cmp>
</div>
<script src="lib/angular/angular.js"></script>
<script src="js/directives.js"></script>
<script src="js/controllers.js"></script>
<script src="js/app.js"></script>
</body>
</html>
'use strict';
angular.module('myApp', [
'myApp.directives',
'myApp.controllers'
]);
'use strict';
angular.module('myApp.controllers', [])
.controller('myCtrl', ['$scope', function($scope) {
$scope.name = 'test';
}]);
'use strict';
angular.module('myApp.directives', [])
.directive('cmp', function () {
return {
restrict: 'E',
controller: 'cmpCtrl',
replace: true,
transclude: true,
scope: {
name: '='
},
template: '<div ng-transclude></div>'
};
})
.controller('cmpCtrl', ['$scope', '$element', '$attrs' , function ($scope, $element, $attrs) {
$scope.$parent.$watch('name', function (newVal) {
if (newVal) {
$scope.$parent.updatedSize = newVal.length;
console.log(newVal.length);
}
}, true);
}])
.directive('enhancedTextarea', function () {
return {
restrict: 'E',
replace: true,
transclude: true,
template: '<textarea ng-transclude></textarea>'
};
})
.directive('notice', function () {
return {
restrict: 'E',
require: '^cmp',
replace: true,
scope: {
updatedSize: '='
},
template: '<div>{{size}}</div>',
link: function ($scope, $element, $attrs, cmpCtrl) {
console.log(cmpCtrl);
$scope.$parent.$watch('updatedSize', function (newVal) {
if (newVal) {
$scope.size = newVal;
}
}, true);
}
};
});
最后,directions.js:
<!doctype html>
<html lang="en" ng-app="myApp">
<head>
<meta charset="utf-8">
<title>My AngularJS App</title>
<link rel="stylesheet" href="css/app.css"/>
</head>
<body>
<div ng-controller="myCtrl">
<cmp>
<enhanced-textarea ng-model="name"></enhanced-textarea>
<h3>{{name}}</h3>
<notice></notice>
</cmp>
</div>
<script src="lib/angular/angular.js"></script>
<script src="js/directives.js"></script>
<script src="js/controllers.js"></script>
<script src="js/app.js"></script>
</body>
</html>
'use strict';
angular.module('myApp', [
'myApp.directives',
'myApp.controllers'
]);
'use strict';
angular.module('myApp.controllers', [])
.controller('myCtrl', ['$scope', function($scope) {
$scope.name = 'test';
}]);
'use strict';
angular.module('myApp.directives', [])
.directive('cmp', function () {
return {
restrict: 'E',
controller: 'cmpCtrl',
replace: true,
transclude: true,
scope: {
name: '='
},
template: '<div ng-transclude></div>'
};
})
.controller('cmpCtrl', ['$scope', '$element', '$attrs' , function ($scope, $element, $attrs) {
$scope.$parent.$watch('name', function (newVal) {
if (newVal) {
$scope.$parent.updatedSize = newVal.length;
console.log(newVal.length);
}
}, true);
}])
.directive('enhancedTextarea', function () {
return {
restrict: 'E',
replace: true,
transclude: true,
template: '<textarea ng-transclude></textarea>'
};
})
.directive('notice', function () {
return {
restrict: 'E',
require: '^cmp',
replace: true,
scope: {
updatedSize: '='
},
template: '<div>{{size}}</div>',
link: function ($scope, $element, $attrs, cmpCtrl) {
console.log(cmpCtrl);
$scope.$parent.$watch('updatedSize', function (newVal) {
if (newVal) {
$scope.size = newVal;
}
}, true);
}
};
});
“严格使用”;
angular.module('myApp.directives',[])
.指令('cmp',函数(){
返回{
限制:'E',
控制器:“cmpCtrl”,
替换:正确,
是的,
范围:{
名称:'='
},
模板:“”
};
})
.controller('cmpCtrl',['$scope','$element','$attrs',函数($scope,$element,$attrs){
$scope.$parent.$watch('name',函数(newVal){
if(newVal){
$scope.$parent.updatedSize=newVal.length;
console.log(newVal.length);
}
},对);
}])
.指令('enhancedTextarea',函数(){
返回{
限制:'E',
替换:正确,
是的,
模板:“”
};
})
.指令('通知',功能(){
返回{
限制:'E',
要求:“^cmp”,
替换:正确,
范围:{
updatedSize:“=”
},
模板:“{size}}”,
链接:函数($scope、$element、$attrs、cmpCtrl){
控制台日志(cmpCtrl);
$scope.$parent.$watch('updatedSize',函数(newVal){
if(newVal){
$scope.size=newVal;
}
},对);
}
};
});
我知道我的代码是臃肿的,但我正在修剪它。请容忍我
我不明白为什么通知
元素中的大小
模型属性没有更新…
完整应用程序位于github上问题在于作用域继承,您的
enhancedTextarea
指令“作用域继承了控制器的名称
属性,因为它是未定义的。但是,一旦您更改了textarea值,它的属性就被创建了,,之后您所更改的内容将更改该指令的scope属性
看看这个
当您在不更改文本区域的情况下检查控制台时,将不会看到作用域的name
属性。键入内容时,将创建属性,该属性将覆盖父对象的作用域名称属性
当您像这样更改代码时,它会起作用:
<enhanced-textarea ng-model="name"></enhanced-textarea>
<cmp>
<h3>{{name}}</h3>
<notice></notice>
</cmp>
{{name}}
为了创建松散耦合的代码,我建议您不要在指令中依赖$scope.$parent
。您应该尝试使用指令绑定与父属性绑定