如何使用Ionic 4动态添加带有Google Places的文本字段 [英] how to add a text field with google places dynamically using ionic 4
问题描述
我想在我的项目中使用google-place-api autoComplete,但这给了我一个错误:
I'm tying to use google-place-api autoComplete in my project, but it gives me an error:
TypeError: Cannot read property 'getInputElement' of undefined
.html
<section
[formGroupName]="i"
*ngFor="let tech of form.controls.stations.controls; let i = index">
<ion-item-group>
<ion-item-divider color="light">Station #{{ i + 1 }}</ion-item-divider>
<ion-item>
<ion-label position="floating">Technology name:</ion-label>
<ion-input
#autoStation
type="text"
maxlength="50"
formControlName="name"></ion-input>
</ion-item>
<!-- Allow generated input field to be removed -->
<ion-button
(click)="removeInputField(i)"
*ngIf="form.controls.technologies.length > 1"
class="ion-no-padding ion-float-right" shape="round" fill="clear">
<ion-icon slot="start" name="close"></ion-icon>Remove</ion-button>
</ion-item-group>
</section>
<div>
<!-- Allow new input field to be generated/added -->
<ion-button
(click)="addNewInputField()"
class="ion-no-padding ion-float-left" shape="round" fill="clear">
<ion-icon slot="start" name="add"></ion-icon> Add a new technology</ion-button>
</div>
.ts
@ViewChild('autoStation', {static: true}) autoStation: any;
ngAfterViewInit(): void {
this.autoStation.getInputElement().then((input:HTMLInputElement)=>{
var autocompl = new google.maps.places.Autocomplete(input, {
//somee code
});
}
});
addNewInputField() : void {
const control = this.form.controls.technologies as FormArray;
control.push(this.initTechnologyFields());
}
removeInputField(i : number) : void {
const control = this.form.controls.technologies as FormArray;
control.removeAt(i);
}
PS: 当我删除循环时,它可以工作,但是当我再次添加它时,它给出了上面的错误. 有什么建议吗?
PS: when I remove the fro loop it works, but when I add it again it gives the error above. any suggestions please ?
我添加了一些图片来说明这个问题,当您尝试输入城市google place api时,当我单击按钮添加新图片时,您看到的第一张图片是我制作的第二张UI.城市,生成了文本字段,但Google Places api不起作用,这就是问题所在.
I added some pictures to have a raugh idea about the problem, the first pic you see the UI which I made the second one When when Tried to typing a city google places api is working but when I click the button to add new city the text field is generated but the google places api doesnt work, this is the problem.
推荐答案
您正在模板代码中使用* ngFor指令,这意味着您无法使用ViewChild来获取特定的离子输入组分(因为通过* ngFor您将得到其中的n个).您需要采用ViewChildren,捕获autoStation元素的列表,然后确定需要使用的元素:
You are using *ngFor directive in your template code and that means you can't use ViewChild to get particular ion-input component (since via *ngFor you will get n-amount of those). You need to adopt ViewChildren, capture the list of autoStation elements, then figure which one you need to work with:
import { ViewChildren, QueryList } from '@angular/core';
@ViewChildren('autoStation') autoStationList:QueryList<any>;
ngAfterViewInit(){
console.log(this.autoStationList);
}
已更新: 由于您有多个输入元素(由于* ngFor复制),因此您需要遍历每个元素并在特定的"autoStation"上执行操作:
Updated: Since you have several input elements (due to *ngFor replication), you need to run through each element and perform your action on particular 'autoStation':
ngAfterViewInit() {
this.autoStationList.forEach( autoStation => {
autoStation.getInputElement().then((input:HTMLInputElement)=>{
let autocompl = new google.maps.places.Autocomplete(input, {
//some code
});
}
})
};
我刚刚在VSCODE中尝试了此示例:
I just tried this example in my VSCODE:
模板:
<ion-header>
<ion-toolbar>
<ion-title>
query list example
</ion-title>
</ion-toolbar>
</ion-header>
<ion-content>
<ion-list lines="none">
<section *ngFor="let tech of list; let i = index">
<ion-item-group>
<ion-item-divider color="light">Station #{{ i + 1 }}</ion-item-divider>
<ion-item>
<ion-label position="floating">Technology name:</ion-label>
<ion-input #autoStation type="text" maxlength="50"></ion-input>
</ion-item>
</ion-item-group>
</section>
</ion-list>
</ion-content>
ts:
import { Component, ViewChildren, QueryList } from '@angular/core';
@Component({
selector: 'app-tab1',
templateUrl: 'tab1.page.html',
styleUrls: ['tab1.page.scss']
})
export class Tab1Page {
@ViewChildren('autoStation') autoStationList:QueryList<any>;
list = [];
constructor() {
this.list = [0,1,2,3,4,5]
}
ngAfterViewInit() {
this.autoStationList.forEach( autoStation => {
autoStation.getInputElement().then((input:HTMLInputElement) => {
console.log(input)
//let autocompl = new google.maps.places.Autocomplete(input, {
//some code
//});
})
})
};
}
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