blocks|key|4448238|text|基本上，你不能直接从parent访问变量。您可以通过事件来执行此操作。组件的输出属性负责此操作。我建议你读一下https://angular.io/docs/ts/latest/guide/template-syntax.html#input-and-output-properties|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4448239|entityMap|0|LINK|mutability|MUTABLE|url|https://angular.io/docs/ts/latest/guide/template-syntax.html#input-and-output-properties^0|1J|2G|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Basically you can't access variables from parent directly. You do this by events. Component's output property is responsible for this. I would suggest reading <a href="https://angular.io/docs/ts/latest/guide/template-syntax.html#input-and-output-properties" rel="nofollow">https://angular.io/docs/ts/latest/guide/template-syntax.html#input-and-output-properties</a>

blocks|key|4448271|text|像NgModel对NgForm做的小把戏怎么样？您必须将您的父级注册为提供者，然后在子级的构造函数中加载您的父级。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4448272|这样一来，你就不必给所有的孩子都装上[sharedList]了。|offset|length|style|CODE|4448273|//+Parent.ts
export+var+parentProvider+=+{
++++provide:+Parent,
++++useExisting:+forwardRef(function+()+{+return+Parent;+})
};

@Component({
++++moduleId:+module.id,
++++selector:+'parent',
++++template:+'<div><ng-content></ng-content></div>',
++++providers:+[parentProvider]
})
export+class+Parent+{
++++@Input()
++++public+sharedList+=+[];
}

//+Child.ts
@Component({
++++moduleId:+module.id,
++++selector:+'child',
++++template:+'<div>child</div>'
})
export+class+Child+{
++++constructor(private+parent:+Parent)+{
++++++++parent.sharedList.push('Me.');
++++}
}|code-block|syntax|javascript|4448274|然后你的HTML|4448275|<parent+[sharedList]="myArray">
++++<child></child>
++++<child></child>
</parent>|4448276|您可以在Angular文档中找到有关该主题的更多信息：https://angular.io/guide/dependency-injection-in-action#find-a-parent-component-by-injection|4448277|entityMap|0|LINK|mutability|MUTABLE|url|https://angular.io/guide/dependency-injection-in-action#find-a-parent-component-by-injection^0|0|I|C|0|0|0|0|R|2K|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|16|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|17|8|@]|9|@$D|18|E|19|1|1A]]|A|$]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

What about a little trickery like NgModel does with NgForm? You have to register your parent as a provider, then load your parent in the constructor of the child.

That way, you don't have to put <code>[sharedList]</code> on all your children.

<pre><code>// Parent.ts
export var parentProvider = {
 provide: Parent,
 useExisting: forwardRef(function () { return Parent; })
};

@Component({
 moduleId: module.id,
 selector: 'parent',
 template: '&lt;div&gt;&lt;ng-content&gt;&lt;/ng-content&gt;&lt;/div&gt;',
 providers: [parentProvider]
})
export class Parent {
 @Input()
 public sharedList = [];
}

// Child.ts
@Component({
 moduleId: module.id,
 selector: 'child',
 template: '&lt;div&gt;child&lt;/div&gt;'
})
export class Child {
 constructor(private parent: Parent) {
 parent.sharedList.push('Me.');
 }
}
</code></pre>

Then your HTML

<pre><code>&lt;parent [sharedList]="myArray"&gt;
 &lt;child&gt;&lt;/child&gt;
 &lt;child&gt;&lt;/child&gt;
&lt;/parent&gt;
</code></pre>

You can find more information on the subject in the Angular documentation: <a href="https://angular.io/guide/dependency-injection-in-action#find-a-parent-component-by-injection" rel="noreferrer">https://angular.io/guide/dependency-injection-in-action#find-a-parent-component-by-injection</a>

blocks|key|4448315|text|您可以在父组件声明中执行此操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4448316|get+self():+ParenComponentClass+{
++++++++return+this;
++++}|code-block|syntax|javascript|4448317|在子组件中，包含ParenComponentClass导入后，声明：|4448318|private+_parent:+ParenComponentClass+;
@Input()+set+parent(value:+ParenComponentClass+)+{
++++this._parent+=+value;
}

get+parent():+ParenComponentClass+{
++++return+this._parent;
}|4448319|然后，您可以在父级的模板中执行以下操作|4448320|<childselector+[parent]="self"></childselector>|4448321|现在，您可以使用以下命令从子进程访问父进程的公共属性和方法|4448322|this.parent|4448323|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

You can do this
In the parent component declare:

<pre><code>get self(): ParenComponentClass {
 return this;
 }
</code></pre>

In the child component,after include the import of ParenComponentClass, declare:

<pre><code>private _parent: ParenComponentClass ;
@Input() set parent(value: ParenComponentClass ) {
 this._parent = value;
}

get parent(): ParenComponentClass {
 return this._parent;
}
</code></pre>

Then in the template of the parent you can do

<pre><code>&lt;childselector [parent]="self"&gt;&lt;/childselector&gt;
</code></pre>

Now from the child you can access public properties and methods of parent using

<pre><code>this.parent
</code></pre>

I have a variable in the parent component that might be changed by child, parent will be using this variable in the view and thus has to propagate changes.

<pre><code>import {Component, View} from 'angular2/core';

@Component({selector: 'parent'})
@View({
 directives: [Child],
 template: `&lt;childcomp&gt;&lt;/childcomp&gt;`
})
class Parent {
 public sharedList = new Array();
 constructor() {
 }
}


@Component({selector: 'child'})
@View({template: `...`})
class Child {
 constructor() {
 //access 'sharedList' from parent and set values
 sharedList.push("1");
 sharedList.push("2");
 sharedList.push("3");
 sharedList.push("4");
 }
}
</code></pre>

Angular2: child component access parent class variable/function

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在父组件中有一个变量，它可能会被子组件更改，父组件将在视图中使用该变量，因此必须传播更改。import {Component, View} from 'angular2/core';@Component({selector: 'parent'})@View({    directives: [Child],    t...

问Angular2:子组件访问父类变量/函数
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