Angular 2 ng bootstrap typehead传递附加参数 [英] Angular 2 ng bootstrap typehead pass additional parameter
问题描述
如何将表单数组索引传递给ng-bootstrap标头中的getCities函数,包括当前输入文本.考虑 3 是表单数组索引.
How to pass form array index to getCities function in ng-bootstrap typehead including current input text. Consider 3 is form array index.
address.component.html
<input name="city" type="text" id="city" formControlName="city" [ngbTypeahead]="getCities">
address.component.ts
getCities = (text$: Observable<string>) =>
text$
.debounceTime(300)
.distinctUntilChanged()
.switchMap(query =>
query.length < 2 ? [] : this.apiService.getCities(query).catch(() => {
return Observable.of([]);
});)
推荐答案
听起来您需要将其他参数传递给ngbTypeahead函数(无论是索引参数还是其他参数).
It sounds like you are needing to pass an additional parameter to the ngbTypeahead function (be it an index parameter or otherwise).
文档( https://ng-bootstrap.github.io /#/components/typeahead/api )不提供传递参数,您可以实现工厂"方法,该方法返回带有传入的索引(或其他任何参数)参数的适当函数.
While the documentation ( https://ng-bootstrap.github.io/#/components/typeahead/api ) does not provide for passing parameters, you can implement a "factory" method that returns an appropriate function with the index (or whatever) parameter passed in.
address.component.html
<input name="city"
type="text"
id="city"
formControlName="city"
[ngbTypeahead]="searchFunctionFactory($index)" >
address.component.ts
//A function that returns a "search" function for our ngbTypeahead w/ "preloaded" parameters
public searchFunctionFactory($index: any): (text: Observable<string>) => Observable<any[]> {
//Create a function that considers the specified $index parameter value
let getCities = (text$: Observable<string>) =>
text$
.debounceTime(300)
.distinctUntilChanged()
.switchMap( query => {
//some logic involving $index here
//...
//query.length < 2 ? [] : this.apiService.getCities(query).catch(() => {
//return Observable.of([]);
});
//Return that "custom" function, which will in turn be called by the ngbTypescript component
return getCities;
}
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