knockout.js How to access $index in handler function

Question

As I understand, $index is available inside a foreach: binding, giving the index of the object... I have a click: binding e.g. c

Answer 1

It is easier with ES6 code. In my html I have an array of pages

In the view controller class I have the gotoPage method. The first parameter will be the $index of the foreach. Very simple.

class ViewModel {
    constructor() {
        this.requestedPage = ko.observable(0);
        this.pages = ko.observableArray([0,1,2,3]);
    }

    async run() {
        this.message("Running");
    }

    gotoPage(pageRequested, event) {
        this.requestedPage(pageRequested);
        this.run();
    }
}