56 lines
1.4 KiB
JavaScript
56 lines
1.4 KiB
JavaScript
import jQuery from "jquery";
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(function($) {
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$.fn.unsticky = function() {
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return this.trigger("unstick.sticky").unbind(".sticky");
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};
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$.fn.sticky = function() {
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var self = this;
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var stuckToBottom = true;
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var lastStick = 0;
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var keepToBottom = function() {
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if (stuckToBottom) {
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self.scrollBottom();
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}
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};
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$(window).on("resize.sticky", keepToBottom);
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self
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.on("unstick.sticky", function() {
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$(window).off("resize.sticky", keepToBottom);
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})
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.on("scroll.sticky", function() {
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// When resizing, sometimes the browser sends a bunch of extra scroll events due to content
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// reflow, so if we resized within 250ms we can assume it's one of those. The order of said
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// events is not predictable, and scroll can happen last, so not setting stuckToBottom is
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// not enough, we have to force the scroll still.
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if (stuckToBottom && Date.now() - lastStick < 250) {
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self.scrollBottom();
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} else {
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stuckToBottom = self.isScrollBottom();
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}
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})
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.on("scrollBottom.sticky", function() {
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stuckToBottom = true;
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lastStick = Date.now();
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this.scrollTop = this.scrollHeight;
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})
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.on("msg.sticky", keepToBottom)
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.scrollBottom();
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return self;
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};
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$.fn.scrollBottom = function() {
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this.trigger("scrollBottom.sticky");
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return this;
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};
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$.fn.isScrollBottom = function() {
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var el = this[0];
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return el.scrollHeight - el.scrollTop - el.offsetHeight <= 30;
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};
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})(jQuery);
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