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[英]angular.dart how to create a custom component programmatically and add to page?
[英]How to add a component programmatically in Angular.Dart?
我想基于从AJAX调用接收的一些信息动态构建组件树。
如何以编程方式从其他组件内部向DOM添加组件? 我有<outer-comp>
,我希望,基于一些逻辑,插入一个<inner-comp>
。 以下代码只是将元素<inner-comp></inner-comp>
插入到DOM中,而不是实际的<inner-comp>
表示。
@NgComponent(
selector: 'outer-comp',
templateUrl: 'view/outer_component.html',
cssUrl: 'view/outer_component.css',
publishAs: 'outer'
)
class AppComponent extends NgShadowRootAware {
void onShadowRoot(ShadowRoot shadowRoot) {
DivElement inner = shadowRoot.querySelector("#inner");
inner.appendHtml("<inner-comp></inner-comp>");
}
}
更新:我设法以下列方式正确渲染内部组件,但我仍然不确定这是否正确:
class AppComponent extends NgShadowRootAware {
Compiler compiler;
Injector injector;
AppComponent(this.compiler, this.injector);
void onShadowRoot(ShadowRoot shadowRoot) {
DivElement inner = shadowRoot.querySelector("#inner");
inner.appendHtml("<inner-comp></inner-comp>");
BlockFactory template = compiler(inner.nodes);
var block = template(injector);
inner.replaceWith(block.elements[0]);
}
}
AngularDart 0.9.9中的API已更改:
AngularDart 0.10.0引入了以下更改:
所以pavelgj的代码现在看起来像这样:
class AppComponent extends ShadowRootAware {
Compiler compiler;
Injector injector;
Scope scope;
DirectiveMap directives;
AppComponent(this.compiler, this.injector, this.scope, this.directives);
void onShadowRoot(ShadowRoot shadowRoot) {
DivElement inner = shadowRoot.querySelector("#inner");
inner.appendHtml("<inner-comp></inner-comp>");
ViewFactory template = compiler([inner], directives);
Scope childScope = scope.createChild(scope.context);
Injector childInjector =
injector.createChild([new Module()..bind(Scope, toValue: childScope)]);
template(childInjector, [inner]);
}
}
这将是块API的正确使用。
class AppComponent extends NgShadowRootAware {
Compiler compiler;
Injector injector;
Scope scope;
DirectiveMap directives;
AppComponent(this.compiler, this.injector, this.scope, this.directives);
void onShadowRoot(ShadowRoot shadowRoot) {
DivElement inner = shadowRoot.querySelector("#inner");
inner.appendHtml("<inner-comp></inner-comp>");
BlockFactory template = compiler([inner], directives);
Scope childScope = scope.$new();
Injector childInjector =
injector.createChild(new Module()..value(Scope, childScope));
template(childInjector, [inner]);
}
}
此外,如果您需要重新编译内部模板,请确保在之前的childScope
上执行childScope.$destroy()
。
由于Angular Dart库中的更改,上面的代码会对较长时间的工作进行采样。 特别是ViewFactory.call,它不再使用注入器,而是使用Scope和DirectiveInjector。 我已经尝试调整上面的内容而且非常接近。 组件显示但没有任何绑定被替换(例如,我看到{{cmp.value}}。
这是我正在使用的代码。 我认为这里的问题是DirectiveInjector是以null形式出现的。
void main() {
IBMModule module = new IBMModule();
AngularModule angularModule = new AngularModule();
Injector injector = applicationFactory()
.addModule(module)
.run();
AppComponent appComponent = injector.get(AppComponent);
appComponent.addElement("<brazos-input-string label='test'/>");
}
@Injectable()
class AppComponent {
NodeValidator validator;
Compiler _compiler;
DirectiveInjector _injector;
DirectiveMap _directiveMap;
NodeTreeSanitizer _nodeTreeSanitizer;
Scope _scope;
AppComponent(this._injector, this._compiler, this._directiveMap, this._scope, this._nodeTreeSanitizer) {
validator = new NodeValidatorBuilder.common()
..allowCustomElement("BRAZOS-INPUT-STRING")
..allowHtml5()
..allowTemplating();
}
void addElement(String elementHTML) {
DivElement container = querySelector("#container");
DivElement inner = new DivElement();
inner.setInnerHtml(elementHTML, validator: validator);
ViewFactory viewFactory = _compiler.call([inner], _directiveMap);
Scope childScope = _scope.createChild(new PrototypeMap(_scope.context));
if (_injector == null) {
print("injector is null");
}
View newView = viewFactory.call(childScope, _injector);
container.append(inner);
newView.nodes.forEach((node) => inner.append(node));
}
}
class IBMModule extends Module {
IBMModule() {
bind(BrazosInputStringComponent);
bind(BrazosTextAreaComponent);
bind(BrazosButtonComponent);
bind(ProcessDataProvider, toImplementation: ActivitiDataProvider);
bind(AppComponent);
}
}
我终于让它工作但不满意不得不添加一个计时器:
@Injectable()
class AppComponent{
NodeValidator validator;
Compiler _compiler;
DirectiveInjector _directiveInjector;
DirectiveMap _directiveMap;
NodeTreeSanitizer _nodeTreeSanitizer;
Injector _appInjector;
Scope _scope;
AppComponent(this._directiveInjector, this._compiler, this._directiveMap, this._nodeTreeSanitizer, this._appInjector, this._scope) {
validator = new MyValidator();
}
void addElement(String id, String elementHTML) {
DivElement container = querySelector(id);
DivElement inner = new DivElement();
container.append(inner);
Element element = new Element.html(elementHTML, validator: validator);
ViewFactory viewFactory = _compiler.call([element], _directiveMap);
if (_scope != null) {
Scope childScope = _scope.createProtoChild();
View newView = viewFactory.call(childScope, _directiveInjector);
newView.nodes.forEach((node) => inner.append(node));
Timer.run(() => childScope.apply());
} else {
print("scope is null");
}
}
}
编辑
包http://pub.dartlang.org/packages/bwu_angular包含这个装饰/指令为bwu-safe-html
------
我使用自定义指令
@NgDirective(
selector: '[my-bind-html]'
)
class MyBindHtmlDirective {
static dom.NodeValidator validator;
dom.Element _element;
Compiler _compiler;
Injector _injector;
DirectiveMap _directiveMap;
MyBindHtmlDirective(this._element, this._injector, this._compiler, this._directiveMap) {
validator = new dom.NodeValidatorBuilder.common()
..allowHtml5()
..allowImages();
}
@NgOneWay('my-bind-html')
set value(value) {
if(value == null) {
_element.nodes.clear();
return;
}
_element.setInnerHtml((value == null ? '' : value.toString()),
validator: validator);
if(value != null) {
_compiler(_element.childNodes, _directiveMap)(_injector, _element.childNodes);
}
}
}
它可以像
my-bind-html='ctrl.somehtml'
角度问题
我创建了一个问题,将此功能包含在Angulars ng-bind-html
https://github.com/angular/angular.dart/issues/742 (已拒绝)
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