[英]Wrap a character in a span element on key press with renderer2 Angular
我有一個 contenteditable div,它在用戶按下“@”時觸發一個事件。 它的作用是將按下的@ 字母包裹在相同位置的自定義元素中。
這是代碼
<div contenteditable="true" role="textarea" (keydown.@)= "onWrap()">
</div>
onWrap() {
setTimeout(() => {
const caretPosition = window.getSelection().getRangeAt(0);
const range = document.createRange();
range.setStart(caretPosition.commonAncestorContainer, caretPosition.startOffset - 1);
range.setEnd(caretPosition.commonAncestorContainer, caretPosition.endOffset );
const previousNode = (range.cloneContents().lastChild as HTMLElement);
const newWrap = this.renderer.createElement('my-custom-component');
//range.surroundContents(newWrap );
}, 10);
}
所以在@press 之后,可編輯的文本必須變成
<div contenteditable="true" role="textarea">
this is my editable content and i want to insert here <my-custom-component>@</my-custom-component> and the rest of the text
</div>
我想要轉換<my-custom-component>
如評論中所述,您可以利用ComponentRendererFactory
並動態創建和附加組件。 您需要的是注入所需的服務。 解析組件工廠需要Injector
, ApplicationRef
是將組件附加到DOM
constructor(
private injector: Injector,
private cfr: ComponentFactoryResolver,
private applicationRef: ApplicationRef
)
定義一個虛擬組件:
@Component({
selector: "app-wrapper",
styleUrls: ["./wrapper.component.css"],
template: `
<span style="background-color:aqua">
x:
{{ innerText }}
</span>
`
})
export class WrapperComponent {
innerText: string;
}
動態創建組件
const wrap = this.renderer.createElement("wrapper-container"); // this can be anything but it is required
const factory = this.cfr.resolveComponentFactory<WrapperComponent>(WrapperComponent);
const cmp = factory.create(this.injector, [], wrap); // attach your component into host element : `wrapper-container`
this.applicationRef.attachView(cmp.hostView); // attach component into DOM
const contents = range.extractContents(); // extract contents
cmp.instance.innerText = contents.textContent; // set components text
range.insertNode(wrap); // insert everything into range.
這是 Stackblitz 示例。
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