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Add onNavigate function to register event handlers #179

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Add onNavigate function to register event handlers #179

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21 changes: 18 additions & 3 deletions resources/script.js
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Expand Up @@ -6,6 +6,16 @@ function currentPosition() {
}


/**
* Register event handlers for slide navigation
*/
var onNavigateHandlers = [];
function onNavigate(fn) {
if (onNavigateHandlers.indexOf(fn) < 0) {
onNavigateHandlers.push(fn);
}
}

/**
* Navigates forward n pages
* If n is negative, we will navigate in reverse
Expand All @@ -23,9 +33,9 @@ function navigate(n) {
document.getElementById('slide-' + position).classList.add('hidden');
document.getElementById('slide-' + nextPosition).classList.remove('hidden');

updateProgress();
updateURL();
updateTabIndex();
for (var i = 0; i < onNavigateHandlers.length; i++) {
onNavigateHandlers[i](nextPosition, numSlides);
}
}


Expand Down Expand Up @@ -111,6 +121,11 @@ function toggleFullScreen() {
}

document.addEventListener('DOMContentLoaded', function () {

onNavigate(updateProgress);
onNavigate(updateURL);
onNavigate(updateTabIndex);

// Update the tabindex to prevent weird slide transitioning
updateTabIndex();

Expand Down