我正在使用ngroute创建一个角度单页应用程序。想要移至基于组件的版本。
问题是孤立的范围。我需要访问主控制器道具和方法。尝试使用绑定,但行不通。我找不到这个问题。该应用程序不使用组件就可以正常工作。当我尝试将主页视图更改为崩溃的组件时。这些是代码的主要部分:
框架
<html ng-app="angularModule" >
<body ng-controller="angularController as angCtrl" >
<div ng-show="angCtrl.user.isLoggedIn" >Sign Out</div>
<div ng-hide="angCtrl.user.isLoggedIn" cd-visible="angCtrl.showSignIn">Sign In</div>
<div id="contentLayer" class="contentLayer" ng-view ></div>
主页模板
<h1 class="pageLabel" >HomePage</h1>
<blockquote>This can be anything. No bindings.</blockquote>
angularController
var app = angular.module ('angularModule', ['ngRoute'] );
app.directive ('cdVisible',
function () {
return function (scope, element, attr) {
scope.$watch (attr.cdVisible,
function (visible) {
element.css ('visibility', visible ? 'visible' : 'hidden');
}
);
};
}
);
app.config ( [ '$locationProvider', '$routeProvider',
function config ($locationProvider, $routeProvider) {
$locationProvider.hashPrefix ('!');
$routeProvider
.when ('/sign-in', {
templateUrl: '/ng-sign-in',
controller: signInController
})
... more routes
.when ('/home', {
template: '<home-page showSignIn="angCtrl.showSignIn" menuSelect="angCtrl.menuSelect" ></home-page>'
})
.otherwise ('/home');
}
]);
function homePageController () {
this.menuSelect ('Devices'); // this statement has no effect on angularController.menuSelection chrome shows it as an anonymous function
this.showSignIn = false; // this bombs: Expression 'undefined' in attribute 'showSignIn' used with directive 'homepage' is non-assignable!
}
app.component ('homePage', {
templateUrl: '/ng-homepage',
controller: homePageController,
bindings: {
menuSelect: '&',
showSignIn: '='
}
});
app.controller ('angularController', [ '$http', '$window', '$location',
function ($http, $window, $location) {
var self = this;
this.user = {
"isLoggedIn": false
};
this.showSignIn = true;
this.menuSelection = "";
this.errorMessage = "";
this.menuSelect =
function (selection) {
self.menuSelection = selection;
};
this.setUserData =
function (userData) {
self.user = userData;
};
this.setShowSignIn =
function (show) {
self.showSignIn = show;
};
this.menuSelect ('');
this.getUserData(); // I removed this for this post
}
]);
我在引发异常的位置添加了评论。主页控制器试图更新AngularController的模型。第一个对第二次抛出异常无济于事。我究竟做错了什么?
首先, showSignIn
是原始的,因此,角将其处理与执行showSignIn="7+2"
完全相同的方式。如果您需要在组件内修改该值,则应将对象与showSignIn
属性一起使用。
现在menuSelect
有点艰难,也许Chrome Console显示了
function (locals) {
return parentGet(scope, locals);
}
这是因为您只是将对angCtrl.menuSelect
的引用传递给组件。
为了从homePageController
内部执行menuSelect
函数(在HTML中):
<home-page menu-select="angCtrl.menuSelect(myMsg)"></home-page>
,然后在组件的控制器中这样称呼:
this.menuSelect({ myMsg:"Devices" })
HTML中的(myMsg)
是呼叫Angular返回此引用的呼吁,然后在执行中,我们通过参数{ myMsg:"Devices" }
以匹配我们刚才所做的参数。您可以检查此答案,以说明它更详细。
在阅读答案的过程中 - 最初编码的库库。
您的建议都起作用。谢谢。没有组件,我使用原型继承来访问父范围中的属性和方法。由于JavaScript原型继承的性质,修改父范围中标量的唯一方法是在父范围上调用Setter方法。显然,这里有类似的东西。有关JavaScript中原型继承的更多信息。
这是概念验证练习。我想测试我从组件中更新父范围中属性和对象的能力,并在父范围内执行方法。此示例以父范围更新标量2种不同的方式:
- 将其粘在对象中,绑定到对象,然后使用该对象从组件中使用该对象进行引用,例如使用logindata.showsignin boolean
- 在父范围内构建一个设置器方法并将其绑定到该方法,并从组件中调用setter,就像使用菜单选择一样(实际上无非是菜单选择的设置器)
并在此过程中演示调用功能。
最终工作代码是:(主页模板不更改)
框架
<html ng-app="angularModule" >
<body ng-controller="angularController as angCtrl" >
<div ng-show="angCtrl.user.isLoggedIn" >Sign Out</div>
<div ng-hide="angCtrl.user.isLoggedIn" cd-visible="angCtrl.loginData.showSignIn">Sign In</div>
<div id="contentLayer" class="contentLayer" ng-view ></div>
angularController
var app = angular.module ('angularModule', ['ngRoute'] );
app.directive ('cdVisible',
function () {
return function (scope, element, attr) {
scope.$watch (attr.cdVisible,
function (visible) {
element.css ('visibility', visible ? 'visible' : 'hidden');
}
);
};
}
);
app.config ( [ '$locationProvider', '$routeProvider',
function config ($locationProvider, $routeProvider) {
$locationProvider.hashPrefix ('!');
$routeProvider
.when ('/sign-in', {
templateUrl: '/ng-sign-in',
controller: signInController
})
... more routes
.when ('/home', {
template: '<home-page login-data="angCtrl.loginData" menu-select="angCtrl.menuSelect(mySelection)" ></home-page>'
})
.otherwise ('/home');
}
]);
function homePageController () {
this.menuSelect ( { mySelection: 'Overview' });
this.loginData.showSignIn = true;
}
app.component ('homePage', {
templateUrl: '/ng-homepage',
controller: homePageController,
restrict: 'E',
bindings: {
menuSelect: '&',
loginData: '='
}
});
app.controller ('angularController', [ '$http', '$window', '$location',
function ($http, $window, $location) {
var self = this;
this.user = {
"isLoggedIn": false
};
this.loginData = {
"showSignIn": false
};
this.menuSelection = "";
this.errorMessage = "";
this.menuSelect =
function (selection) {
self.menuSelection = selection;
};
this.setUserData =
function (userData) {
self.user = userData;
};
this.setShowSignIn =
function (show) {
self.showSignIn = show;
};
this.menuSelect ('');
this.getUserData(); // I removed this for this post
}
]);