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adding onChange event #82

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adding onChange event #82

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47 changes: 39 additions & 8 deletions src/sticky.js
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@ class Sticky {
stickyFor: options.stickyFor || 0,
stickyClass: options.stickyClass || null,
stickyContainer: options.stickyContainer || 'body',
onChange: options.onChange || null
};

this.updateScrollTopPosition = this.updateScrollTopPosition.bind(this);
Expand Down Expand Up @@ -75,11 +76,22 @@ class Sticky {
// set default variables
element.sticky.active = false;

element.sticky.marginTop = parseInt(element.getAttribute('data-margin-top')) || this.options.marginTop;
element.sticky.marginBottom = parseInt(element.getAttribute('data-margin-bottom')) || this.options.marginBottom;
element.sticky.stickyFor = parseInt(element.getAttribute('data-sticky-for')) || this.options.stickyFor;
element.sticky.stickyClass = element.getAttribute('data-sticky-class') || this.options.stickyClass;
element.sticky.wrap = element.hasAttribute('data-sticky-wrap') ? true : this.options.wrap;
element.sticky.marginTop =
parseInt(element.getAttribute('data-margin-top')) ||
this.options.marginTop;
element.sticky.marginBottom =
parseInt(element.getAttribute('data-margin-bottom')) ||
this.options.marginBottom;
element.sticky.stickyFor =
parseInt(element.getAttribute('data-sticky-for')) ||
this.options.stickyFor;
element.sticky.stickyClass =
element.getAttribute('data-sticky-class') || this.options.stickyClass;
element.sticky.onChange =
element.getAttribute('data-sticky-on-change') || this.options.onChange;
element.sticky.wrap = element.hasAttribute('data-sticky-wrap')
? true
: this.options.wrap;
// @todo attribute for stickyContainer
// element.sticky.stickyContainer = element.getAttribute('data-sticky-container') || this.options.stickyContainer;
element.sticky.stickyContainer = this.options.stickyContainer;
Expand Down Expand Up @@ -266,7 +278,14 @@ class Sticky {
if (element.sticky.stickyClass) {
element.classList.add(element.sticky.stickyClass);
}
} else if (this.scrollTop > (element.sticky.rect.top - element.sticky.marginTop)) {
if (element.sticky.onChange && !element.sticky.on) {
element.sticky.on = true;
element.sticky.onChange(true);
}
} else if (
this.scrollTop >
element.sticky.rect.top - element.sticky.marginTop
) {
this.css(element, {
position: 'fixed',
width: element.sticky.rect.width + 'px',
Expand All @@ -281,6 +300,10 @@ class Sticky {
if (element.sticky.stickyClass) {
element.classList.remove(element.sticky.stickyClass);
}
if (element.sticky.onChange && element.sticky.on) {
element.sticky.on = false;
element.sticky.onChange(false);
}

this.css(element, {
top: (element.sticky.container.rect.top + element.sticky.container.offsetHeight) - (this.scrollTop + element.sticky.rect.height + element.sticky.marginBottom) + 'px' }
Expand All @@ -289,6 +312,10 @@ class Sticky {
if (element.sticky.stickyClass) {
element.classList.add(element.sticky.stickyClass);
}
if (element.sticky.onChange && !element.sticky.on) {
element.sticky.on = true;
element.sticky.onChange(true);
}

this.css(element, { top: element.sticky.marginTop + 'px' });
}
Expand All @@ -302,9 +329,13 @@ class Sticky {
if (element.sticky.wrap) {
this.css(element.parentNode, { display: '', width: '', height: '' });
}
}
}

if (element.sticky.onChange && element.sticky.on) {
element.sticky.on = false;
element.sticky.onChange(false);
}
}
}

/**
* Function that updates element sticky rectangle (with sticky container), then activate or deactivate element, then update position if it's active
Expand Down