Bootstrap 3

bs-tooltip-button.js

import {inject, customAttribute} from 'aurelia-framework'

@inject(Element)
@customAttribute('bs-tooltip')
export class BsTooltip {
    constructor(element){
        this.element = element
    }

    valueChanged(newVal, oldVal) {
        $(this.element)
            .attr('data-original-title', newVal)
            .tooltip('fixTitle')
    }

}

view-model.js

        this.email = 'super@gm'
        window.setInterval(()=>{this.email = (this.email == 'super@gm' ? 'nonsense@gm' : 'super@gm')}, 2000)

view.slim

require from='../bs-tooltip-attribute.js'

span bs-tooltip.bind='email' Hello world