I have integrated the Tooltip for Angular (ng2-tooltip-directive) into my application to display tooltips.
Given the code below, how can I ensure that tooltips are hidden whenever the title is undefined?
//HTML
<div tooltip="{{title}}"></div>
//TS
export class Component {
title: string = undefined
}
It's worth noting that in this scenario, the tooltip appears with no text.
Furthermore, an interactive example demonstrating this issue can be found here.
<span [tooltip]="errorMessage" [display]="showTooltip" content-type="template" placement="right" show-delay="100" hide-delay="500">
Using the display attribute in ng2 tooltip allows you to control the visibility of the tooltip. In this example, a boolean variable showTooltip is used as the value for the display attribute.
Implement conditional rendering with *ngIf
<ng-container *ngIf="title">
<div tooltip="{{title}}"></div>
<ng-container>
<ng-container *ngIf="title == null">
<div></div>
<ng-container>
After numerous attempts, I experimented with concealing the tooltip based on a condition in ng2-tooltip-directive. Unfortunately, this functionality is only available in the Pro version which offers element selection and additional features.
Alternatively, there are several excellent tooltip libraries accessible for Angular material design.
Note: It is not advisable to use
*ngIf title and tooltip=""If you are utilizing bootstrap in your project, consider using ngbTooltip:
npm module
@ng-bootstrap/ng-bootstrap
app.module.ts
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
imports: [
....
NgbModule,
....
]
.html
<ng-template #TooltipContent>
<div>This file belongs to <b>
{{file.owner.name}}</b>
</div>
</ng-template>
<div *ngFor="let file of files">
.....
<div [ngbTooltip]="file.owner.name ? TooltipContent : ''">
.....
.....
</div>
.....
.....
</div>
In the illustrated example above, the tooltip will only be displayed if the file has an owner.
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