put an attribute on an html tag using an * ngFor

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put an attribute on an html tag using an * ngFor



I'm doing an app using IONIC, but it's based on angular. I simply want that if one element is the last one:


(item==myArray.length?'navPop':'')



add the navPop attribute, otherwise do not add it. (in IONIC, navPop attribute is, when you click, it returns to a preview that is what I need).



I'm doing this, but I get errors:


this.myArray=[1,2,3,4];

<ion-slide *ngFor="let item of myArray" text-center item==myArray.length?'navPop':''>



I hope this result (if is my last element):


<ion-slide text-center></ion-slide>
<ion-slide text-center></ion-slide>
<ion-slide text-center></ion-slide>
//last element with navPop
<ion-slide text-center navPop></ion-slide>



how can I fix it, thanks?




3 Answers
3



You can use the attr binding, like so:


attr


<ion-slide *ngFor="let item of myArray" text-center [attr.navPop]="item==myArray.length ? '': null" >



You could also modify this to use the last property, as suggested by others


last



Use last


<ion-slide *ngFor="let item of myArray;let _last=last" text-center [attr.navPop]="_last" >



https://angular.io/api/common/NgForOf



index: number: The index of the current item in the iterable.
first: boolean: True when the item is the first item in the iterable.
last: boolean: True when the item is the last item in the iterable.
even: boolean: True when the item has an even index in the iterable.
odd: boolean: True when the item has an odd index in the iterable.


index: number: The index of the current item in the iterable.


first: boolean: True when the item is the first item in the iterable.


last: boolean: True when the item is the last item in the iterable.


even: boolean: True when the item has an even index in the iterable.


odd: boolean: True when the item has an odd index in the iterable.



You can do following. Angular provides a variable called last within ngFor.


last


ngFor


<ng-container *ngFor="let item of myArray; let isLast = last">
<ng-container *ngIf="!isLast">
<ion-slide text-center></ion-slide>
</ng-container>
<ng-container *ngIf="isLast">
<ion-slide text-center navPop></ion-slide>
</ng-container>
</ng-container>






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