<select [(ngModel)]="yearSelected" id="year" (click)="filterYear()">
<option value="" disabled selected>Year</option>
<option *ngFor="let y of yearsUnique" [value]="y">{{y}}</option>
</select>
<select [(ngModel)]="facultySelected" id="faculty" (click)="filterFaculty()">
<option value="" disabled selected>Faculty</option>
<option *ngFor="let f of facultiesUnique" [value]="f">{{f}}</option>
</select>
用户选择年份后,在我的 TypeScript 类中,我更新了包含同一年院系的 facultiesUnique 列表(在初始加载时它加载了所有院系):
filterYear() {
setTimeout(() => {
console.log("this.yearSelected " + this.yearSelected);
this.filterList = this.courseList.filter((course: CourseModel) =>
(course.Year.toString().indexOf(this.yearSelected.toString()) !== -1));
this.facultiesUnique = this.courseList.filter((course: CourseModel) =>
(course.Year.toString().indexOf(this.yearSelected.toString()) !== -1));
this.facultiesUnique = this.courseList.map(data => data.Faculty);
}, 500);
}
但是,它不会用相关列表更新下拉列表。 有任何想法吗? 谢谢
最佳答案
您可以使用 (change)="filterYear($event.target.value)"
代替 (click)="filterYear()"
。
我已经在 Stackblitz 上创建了一个演示
component.html
<select [(ngModel)]="yearSelected" (change)="filterYear($event.target.value)">
<option value="" disabled selected>Year</option>
<option *ngFor="let y of yearsUnique" [value]="y">{{y}}</option>
</select>
<select [(ngModel)]="facultySelected" (change)="filterFaculty($event.target.value)">
<option value="" disabled selected>Faculty</option>
<option *ngFor="let f of facultiesUnique" [value]="f.name">{{f.name}}</option>
</select>
component.ts
get facultiesUnique() {
return this.dummyData.filter(items => {
return items.year == this.yearSelected
})
}
关于选择选项中的 Angular 4 更新列表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51877990/