ion-slide slideWillChange has already incremented the activeIndex

[johanlantz]

Bug Report

Ionic Info

cli packages: (/Users/yc00025/.nvm/versions/node/v8.7.0/lib/node_modules)

    @ionic/cli-utils  : 1.19.2
    ionic (Ionic CLI) : 3.20.0

local packages:

    @ionic/app-scripts : 3.1.11
    Ionic Framework    : ionic-angular 3.9.2

System:

    Node : v8.7.0
    npm  : 5.4.2
    OS   : macOS High Sierra

Misc:

    backend : pro

Describe the Bug
I have an ion-slides setup like this:

<ion-slides (ionSlideDidChange)="slideChanged()" (ionSlideWillChange)="slideWillChange()">

slideWillChange() {
   console.log(this.slides.getActiveIndex());
}

slideChanged($event) {
  console.log(this.slides.getActiveIndex());
}

Current Behavior
Both functions output the same activeIndex, i.e. the one we have already moved to.

Expected Behavior
imho, I would expect the slideWillChange() function to have activeIndex as the slide where we are before the transition and the slideChanged() function to output the activeIndex of the new slide once the transition is completed.

[ionitron-bot]

This issue has been automatically identified as an Ionic 3 issue. We recently moved Ionic 3 to its own repository. I am moving this issue to the repository for Ionic 3. Please track this issue over there.

If I've made a mistake, and if this issue is still relevant to Ionic 4, please let the Ionic Framework team know!

Thank you for using Ionic!

[ionitron-bot]

Issue moved to: ionic-team/ionic-v3#394