I am trying to load drop down with alphabetic order. currently i used unique value pipe for the drop down. how i add another pipe for get alphabetic order..
<select class="form-control fix-dropdown" required
(change)="batchSorceList();"
[ngClass]="{'is-invalid':glheaderform.submitted && orgname.invalid}"
#orgname="ngModel" [(ngModel)]="orgNameModel.orgName"
name="orgName">
<option value="undefined" disabled="true">--Select--</option>
<option *ngFor="let bank of orgNameModel | unique ">{{bank.orgName}}</option>
</select>
As a best practice in Angular, you should not use OrderPipe
if you want to sort items based on names, use the pure javascript sort function as follows
sortBy(prop: string) {
return this.orgNameModel.sort((a, b) => a[prop] > b[prop] ? 1 : a[prop] === b[prop] ? 0 : -1);
}
and in your HTML,
<option *ngFor="let bank of of filterBy('orgName')"| unique ">{{bank.orgName}}</option>
使用orderBy
对选择框进行排序
<option *ngFor="let bank of orgNameModel | unique | orderBy : 'your column name' ">{{bank.orgName}}</option>
Implement a pipe like this with a sort function (See live here: https://stackblitz.com/edit/angular-d17atb )-
@Pipe({name: 'sortBy'})
export class SortByPipe implements PipeTransform {
transform(value: any[]) : any[] {
value.sort(function(a,b){
let alc = a.toLowerCase(),
blc = b.toLowerCase();
return alc > blc ? 1 : alc < blc ? -1 : 0;
});
console.log(value);
return value;
}
}
And the html will be like -
<li *ngFor="let value of list | sortBy">{{value}}</li>
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