TS 文件
import { Component, ViewChild } from '@angular/core';
/**
* @title Basic select
*/
@Component({
selector: 'select-overview-example',
templateUrl: 'select-overview-example.html',
styleUrls: ['select-overview-example.css'],
})
export class SelectOverviewExample {
resData = {
"data": ["Pune", "Mumbai", "Pimpari", "Nagpur", "Hydrabad", "Assam", "Karnataka", "Bihar", "Maharashtra", "Delhi", "Srinagar", "Shimla", "Goa", "Rajasthan", "MP", "Aandhra-Pradesh"]
}
selectOne : string ='';
selectTwo='';
selectThree='';
selectFour='';
one='';
@ViewChild('select2') _select2: any
firstSelections: string = '';
// setFirstValues(form) {
// this.firstSelections = form.value.select1
// if (this._select2.value) {
// const secondSelectionsValues = this._select2.value.slice();
// for (var i = secondSelectionsValues.length - 1; i >= 0; i--) {
// if (this.firstSelections.includes(secondSelectionsValues[i])) {
// secondSelectionsValues.splice(i, 1)
// this._select2.writeValue(secondSelectionsValues);
// }
// }
// }
// }
onChanged(){
this.resData.data.forEach(ele =>{
if(ele == this.selectOne)
this.selectTwo !== this.selectOne;
})
}
}
HTML
<form #myForm="ngForm">
<div class="col-md-4">
<mat-form-field >
<mat-select [(ngModel)]="selectOne" name="selectOne" (selectionChange)="onChanged()">
<mat-option *ngFor="let time1 of resData.data" value="time1" >{{time1}}</mat-option>
</mat-select>
</mat-form-field>
</div>
<div class="col-md-4">
<mat-form-field >
<mat-select [(ngModel)]="selectTwo" name="selectTwo" (selectionChange)="onChanged()">
<mat-option *ngFor="let time2 of resData.data" value="time2" >{{time2}}</mat-option>
</mat-select>
</mat-form-field>
</div>
<div class="col-md-4">
<mat-form-field>
<mat-select [(ngModel)]="selectThree" name="selectThree">
<mat-option *ngFor="let time3 of resData.data" value="time3" >{{time3}}</mat-option>
</mat-select>
</mat-form-field>
</div>
<div class="col-md-4">
<mat-form-field>
<mat-select [(ngModel)]="selectFour" name="selectFour">
<mat-option *ngFor="let time4 of resData.data" value="time4" >{{time4}}</mat-option>
</mat-select>
</mat-form-field>
</div>
<form>
说明:当我选择“第一个”下拉列表时,该值在下拉列表“二”、“三”和“四”中被禁用!对于每一个下降,我都必须有一个独特的值(value)。每个下拉列表中的值不应该相同! 是否有使用 (selectionchange) 或 (ngModelChange) 事件? 提前致谢
这是我的 stackblitz - https://stackblitz.com/edit/on-change-selection?file=app%2Fselect-overview-example.html
最佳答案
在 HTML 中::
<form #myForm="ngForm">
<div class="col-md-4">
<mat-form-field >
<mat-select [(ngModel)]="selectOne" name="selectOne" (selectionChange)="onChanged(selectOne)">
<mat-option *ngFor="let time1 of resData.data" [value]="time1" >{{time1}}</mat-option>
</mat-select>
</mat-form-field>
</div>
<div class="col-md-4">
<mat-form-field >
<mat-select [(ngModel)]="selectTwo" name="selectTwo" (selectionChange)="onChanged(selectTwo)">
<mat-option *ngFor="let time2 of resData.data" [value]="time2" >{{time2}}</mat-option>
</mat-select>
</mat-form-field>
</div>
<div class="col-md-4">
<mat-form-field>
<mat-select [(ngModel)]="selectThree" name="selectThree">
<mat-option *ngFor="let time3 of resData.data" [value]="time3" >{{time3}}</mat-option>
</mat-select>
</mat-form-field>
</div>
<div class="col-md-4">
<mat-form-field>
<mat-select [(ngModel)]="selectFour" name="selectFour">
<mat-option *ngFor="let time4 of resData.data" [value]="time4" >{{time4}}</mat-option>
</mat-select>
</mat-form-field>
</div>
<form>
在 TS 中发生更改事件::
onChanged(event){
console.log(this.resData.data[0]);
this.resData.data = this.resData.data.filter(ele => ele !== event);
console.log(this.resData);
}
希望这对您有用!
关于angular - 禁用选定的下拉选项 Angular 2?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54091701/