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Lead by view port #243

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Lead by view port #243

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30d7637
Update rellax.js
cvillalobos Mar 21, 2022
fb27e64
Update rellax.js
cvillalobos Mar 22, 2022
03556fb
Update rellax.js
cvillalobos Mar 22, 2022
f065111
Update rellax.js
cvillalobos Mar 22, 2022
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147 changes: 84 additions & 63 deletions rellax.js
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Original file line number Diff line number Diff line change
Expand Up @@ -79,8 +79,8 @@
// Default Settings
self.options = {
speed: -2,
verticalSpeed: null,
horizontalSpeed: null,
verticalSpeed: null,
horizontalSpeed: null,
breakpoints: [576, 768, 1201],
center: false,
wrapper: null,
Expand All @@ -90,6 +90,7 @@
horizontal: false,
verticalScrollAxis: "y",
horizontalScrollAxis: "x",
leadByViewPort: false,
callback: function() {},
};

Expand Down Expand Up @@ -396,77 +397,97 @@
}
};

// Checks if the target element to animate is within the ViewPort area
// Used when the attribute 'leadByViewPort' is true.
var isInViewport = function (e) {
var container = e.getBoundingClientRect();
var elementTop = (container.top + window.scrollY);
var elementBottom = elementTop + window.outerHeight;

var viewportTop = document.documentElement.scrollTop;
var viewportBottom = viewportTop + window.screen.height;

if (elementBottom > viewportTop && elementTop < viewportBottom) {
return true;
}
else {
return false;
}
};

// Transform3d on parallax element
var animate = function() {
var positions;
for (var i = 0; i < self.elems.length; i++){
// Determine relevant movement directions
var verticalScrollAxis = blocks[i].verticalScrollAxis.toLowerCase();
var horizontalScrollAxis = blocks[i].horizontalScrollAxis.toLowerCase();
var verticalScrollX = verticalScrollAxis.indexOf("x") != -1 ? posY : 0;
var verticalScrollY = verticalScrollAxis.indexOf("y") != -1 ? posY : 0;
var horizontalScrollX = horizontalScrollAxis.indexOf("x") != -1 ? posX : 0;
var horizontalScrollY = horizontalScrollAxis.indexOf("y") != -1 ? posX : 0;

var percentageY = ((verticalScrollY + horizontalScrollY - blocks[i].top + screenY) / (blocks[i].height + screenY));
var percentageX = ((verticalScrollX + horizontalScrollX - blocks[i].left + screenX) / (blocks[i].width + screenX));

// Subtracting initialize value, so element stays in same spot as HTML
positions = updatePosition(percentageX, percentageY, blocks[i].speed, blocks[i].verticalSpeed, blocks[i].horizontalSpeed);
var positionY = positions.y - blocks[i].baseY;
var positionX = positions.x - blocks[i].baseX;

// The next two "if" blocks go like this:
// Check if a limit is defined (first "min", then "max");
// Check if we need to change the Y or the X
// (Currently working only if just one of the axes is enabled)
// Then, check if the new position is inside the allowed limit
// If so, use new position. If not, set position to limit.

// Check if a min limit is defined
if (blocks[i].min !== null) {
if (self.options.vertical && !self.options.horizontal) {
positionY = positionY <= blocks[i].min ? blocks[i].min : positionY;
if ((!self.options.leadByViewPort) || (self.options.leadByViewPort && isInViewport(self.elems[0].parentNode))) {
var positions;
for (var i = 0; i < self.elems.length; i++){
// Determine relevant movement directions
var verticalScrollAxis = blocks[i].verticalScrollAxis.toLowerCase();
var horizontalScrollAxis = blocks[i].horizontalScrollAxis.toLowerCase();
var verticalScrollX = verticalScrollAxis.indexOf("x") != -1 ? posY : 0;
var verticalScrollY = verticalScrollAxis.indexOf("y") != -1 ? posY : 0;
var horizontalScrollX = horizontalScrollAxis.indexOf("x") != -1 ? posX : 0;
var horizontalScrollY = horizontalScrollAxis.indexOf("y") != -1 ? posX : 0;

var percentageY = ((verticalScrollY + horizontalScrollY - blocks[i].top + screenY) / (blocks[i].height + screenY));
var percentageX = ((verticalScrollX + horizontalScrollX - blocks[i].left + screenX) / (blocks[i].width + screenX));

// Subtracting initialize value, so element stays in same spot as HTML
positions = updatePosition(percentageX, percentageY, blocks[i].speed, blocks[i].verticalSpeed, blocks[i].horizontalSpeed);
var positionY = positions.y - blocks[i].baseY;
var positionX = positions.x - blocks[i].baseX;

// The next two "if" blocks go like this:
// Check if a limit is defined (first "min", then "max");
// Check if we need to change the Y or the X
// (Currently working only if just one of the axes is enabled)
// Then, check if the new position is inside the allowed limit
// If so, use new position. If not, set position to limit.

// Check if a min limit is defined
if (blocks[i].min !== null) {
if (self.options.vertical && !self.options.horizontal) {
positionY = positionY <= blocks[i].min ? blocks[i].min : positionY;
}
if (self.options.horizontal && !self.options.vertical) {
positionX = positionX <= blocks[i].min ? blocks[i].min : positionX;
}
}
if (self.options.horizontal && !self.options.vertical) {
positionX = positionX <= blocks[i].min ? blocks[i].min : positionX;

// Check if directional min limits are defined
if (blocks[i].minY != null) {
positionY = positionY <= blocks[i].minY ? blocks[i].minY : positionY;
}
if (blocks[i].minX != null) {
positionX = positionX <= blocks[i].minX ? blocks[i].minX : positionX;
}
}

// Check if directional min limits are defined
if (blocks[i].minY != null) {
positionY = positionY <= blocks[i].minY ? blocks[i].minY : positionY;
}
if (blocks[i].minX != null) {
positionX = positionX <= blocks[i].minX ? blocks[i].minX : positionX;
}
// Check if a max limit is defined
if (blocks[i].max !== null) {
if (self.options.vertical && !self.options.horizontal) {
positionY = positionY >= blocks[i].max ? blocks[i].max : positionY;
}
if (self.options.horizontal && !self.options.vertical) {
positionX = positionX >= blocks[i].max ? blocks[i].max : positionX;
}
}

// Check if a max limit is defined
if (blocks[i].max !== null) {
if (self.options.vertical && !self.options.horizontal) {
positionY = positionY >= blocks[i].max ? blocks[i].max : positionY;
// Check if directional max limits are defined
if (blocks[i].maxY != null) {
positionY = positionY >= blocks[i].maxY ? blocks[i].maxY : positionY;
}
if (self.options.horizontal && !self.options.vertical) {
positionX = positionX >= blocks[i].max ? blocks[i].max : positionX;
if (blocks[i].maxX != null) {
positionX = positionX >= blocks[i].maxX ? blocks[i].maxX : positionX;
}
}

// Check if directional max limits are defined
if (blocks[i].maxY != null) {
positionY = positionY >= blocks[i].maxY ? blocks[i].maxY : positionY;
}
if (blocks[i].maxX != null) {
positionX = positionX >= blocks[i].maxX ? blocks[i].maxX : positionX;
}
var zindex = blocks[i].zindex;

var zindex = blocks[i].zindex;

// Move that element
// (Set the new translation and append initial inline transforms.)
var translate = 'translate3d(' + (self.options.horizontal ? positionX : '0') + 'px,' + (self.options.vertical ? positionY : '0') + 'px,' + zindex + 'px) ' + blocks[i].transform;
self.elems[i].style[transformProp] = translate;
// Move that element
// (Set the new translation and append initial inline transforms.)
var translate = 'translate3d(' + (self.options.horizontal ? positionX : '0') + 'px,' + (self.options.vertical ? positionY : '0') + 'px,' + zindex + 'px) ' + blocks[i].transform;
self.elems[i].style[transformProp] = translate;
}
self.options.callback(positions);
}
self.options.callback(positions);
};

self.destroy = function() {
Expand Down Expand Up @@ -494,4 +515,4 @@
return self;
};
return Rellax;
}));
}));