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Reverse scroll feature #92

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Reverse scroll feature #92

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215dc1d
Reverse scroll
Feb 13, 2018
6d0df49
fix for element scroll
Mar 9, 2018
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1 change: 1 addition & 0 deletions README.MD
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,7 @@ new Vue({

| Option | Description |
| ----- | ----- |
| infinite-scroll-reverse | Instead triggering at the bottom, v-infinite-scroll will trigger on top of element. |
| infinite-scroll-disabled | infinite scroll will be disabled if the value of this attribute is true. |
| infinite-scroll-distance | Number(default = 0) - the minimum distance between the bottom of the element and the bottom of the viewport before the v-infinite-scroll method is executed. |
| infinite-scroll-immediate-check | Boolean(default = true) - indicates that the directive should check immediately after bind. Useful if it's possible that the content is not tall enough to fill up the scrollable container. |
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18 changes: 15 additions & 3 deletions src/directive.js
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Expand Up @@ -152,12 +152,16 @@ var doBind = function () {
doCheck.call(directive);
});
}

directive.reversedCheck = element.hasAttribute('infinite-scroll-reverse');

};

var doCheck = function (force) {
var scrollEventTarget = this.scrollEventTarget;
var element = this.el;
var distance = this.distance;
var reversed = this.reversedCheck;

if (force !== true && this.disabled) return; //eslint-disable-line
var viewportScrollTop = getScrollTop(scrollEventTarget);
Expand All @@ -166,11 +170,19 @@ var doCheck = function (force) {
var shouldTrigger = false;

if (scrollEventTarget === element) {
shouldTrigger = scrollEventTarget.scrollHeight - viewportBottom <= distance;
if (reversed) {
shouldTrigger = scrollEventTarget.scrollTop <= distance;
} else {
shouldTrigger = scrollEventTarget.scrollHeight - viewportBottom <= distance;
}
} else {
var elementTop = getElementTop(element) - getElementTop(scrollEventTarget);
var elementBottom = getElementTop(element) - getElementTop(scrollEventTarget) + element.offsetHeight + viewportScrollTop;

shouldTrigger = viewportBottom + distance >= elementBottom;
if (reversed) {
shouldTrigger = viewportScrollTop <= elementTop;
} else {
shouldTrigger = viewportBottom + distance >= elementBottom;
}
}

if (shouldTrigger && this.expression) {
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