pics/public/js/photonav.js

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1.7 KiB
JavaScript
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function enableKeyDownNavigation() {
document.addEventListener("keydown", function (event) {
if (event.keyCode == 37) {
var target = document.getElementById("previous_photo").href;
if (target) {
event.preventDefault();
document.location.href = target;
}
}
else if (event.keyCode == 39) {
var target = document.getElementById("next_photo").href;
if (target) {
event.preventDefault();
document.location.href = target;
}
}
}, false);
}
function disableKeyDownPropagation(obj) {
for (var x = 0; x < obj.length; x++) {
obj[x].addEventListener("keydown", function (event) {
if (event.keyCode == 37 || event.keyCode == 39) {
event.stopPropagation();
}
});
}
}
function enableTouchNavigation() {
var x_down = null;
var y_down = null;
document.addEventListener('touchstart', function(event) {
x_down = event.touches[0].clientX;
y_down = event.touches[0].clientY;
}, false);
document.addEventListener('touchmove', function(event) {
if (!x_down || !y_down) {
return;
}
var x_diff = x_down - event.touches[0].clientX;
var y_diff = y_down - event.touches[0].clientY;
if (Math.abs(y_diff) > 50) {
return;
}
if (Math.abs(x_diff) > Math.abs(y_diff)) {
if (x_diff > 0) {
var target = document.getElementById("previous_photo").href;
if (target) {
event.preventDefault();
document.location.href = target;
}
} else {
var target = document.getElementById("next_photo").href;
if (target) {
event.preventDefault();
document.location.href = target;
}
}
}
}, false);
}
enableKeyDownNavigation();
enableTouchNavigation();
disableKeyDownPropagation(document.getElementsByTagName("textarea"));
disableKeyDownPropagation(document.getElementsByTagName("input"));