118 lines
3.6 KiB
JavaScript
118 lines
3.6 KiB
JavaScript
import { nextTick } from 'vue';
|
|
import { isFunction } from '@vue/shared';
|
|
import throttle from 'lodash/throttle';
|
|
import { getOffsetTopDistance, getScrollContainer } from '../../../utils/dom.mjs';
|
|
import { throwError } from '../../../utils/error.mjs';
|
|
|
|
const SCOPE = "ElInfiniteScroll";
|
|
const CHECK_INTERVAL = 50;
|
|
const DEFAULT_DELAY = 200;
|
|
const DEFAULT_DISTANCE = 0;
|
|
const attributes = {
|
|
delay: {
|
|
type: Number,
|
|
default: DEFAULT_DELAY
|
|
},
|
|
distance: {
|
|
type: Number,
|
|
default: DEFAULT_DISTANCE
|
|
},
|
|
disabled: {
|
|
type: Boolean,
|
|
default: false
|
|
},
|
|
immediate: {
|
|
type: Boolean,
|
|
default: true
|
|
}
|
|
};
|
|
const getScrollOptions = (el, instance) => {
|
|
return Object.entries(attributes).reduce((acm, [name, option]) => {
|
|
var _a, _b;
|
|
const { type, default: defaultValue } = option;
|
|
const attrVal = el.getAttribute(`infinite-scroll-${name}`);
|
|
let value = (_b = (_a = instance[attrVal]) != null ? _a : attrVal) != null ? _b : defaultValue;
|
|
value = value === "false" ? false : value;
|
|
value = type(value);
|
|
acm[name] = Number.isNaN(value) ? defaultValue : value;
|
|
return acm;
|
|
}, {});
|
|
};
|
|
const destroyObserver = (el) => {
|
|
const { observer } = el[SCOPE];
|
|
if (observer) {
|
|
observer.disconnect();
|
|
delete el[SCOPE].observer;
|
|
}
|
|
};
|
|
const handleScroll = (el, cb) => {
|
|
const { container, containerEl, instance, observer, lastScrollTop } = el[SCOPE];
|
|
const { disabled, distance } = getScrollOptions(el, instance);
|
|
const { clientHeight, scrollHeight, scrollTop } = containerEl;
|
|
const delta = scrollTop - lastScrollTop;
|
|
el[SCOPE].lastScrollTop = scrollTop;
|
|
if (observer || disabled || delta < 0)
|
|
return;
|
|
let shouldTrigger = false;
|
|
if (container === el) {
|
|
shouldTrigger = scrollHeight - (clientHeight + scrollTop) <= distance;
|
|
} else {
|
|
const { clientTop, scrollHeight: height } = el;
|
|
const offsetTop = getOffsetTopDistance(el, containerEl);
|
|
shouldTrigger = scrollTop + clientHeight >= offsetTop + clientTop + height - distance;
|
|
}
|
|
if (shouldTrigger) {
|
|
cb.call(instance);
|
|
}
|
|
};
|
|
function checkFull(el, cb) {
|
|
const { containerEl, instance } = el[SCOPE];
|
|
const { disabled } = getScrollOptions(el, instance);
|
|
if (disabled)
|
|
return;
|
|
if (containerEl.scrollHeight <= containerEl.clientHeight) {
|
|
cb.call(instance);
|
|
} else {
|
|
destroyObserver(el);
|
|
}
|
|
}
|
|
const InfiniteScroll = {
|
|
async mounted(el, binding) {
|
|
const { instance, value: cb } = binding;
|
|
if (!isFunction(cb)) {
|
|
throwError(SCOPE, "'v-infinite-scroll' binding value must be a function");
|
|
}
|
|
await nextTick();
|
|
const { delay, immediate } = getScrollOptions(el, instance);
|
|
const container = getScrollContainer(el, true);
|
|
const containerEl = container === window ? document.documentElement : container;
|
|
const onScroll = throttle(handleScroll.bind(null, el, cb), delay);
|
|
if (!container)
|
|
return;
|
|
el[SCOPE] = {
|
|
instance,
|
|
container,
|
|
containerEl,
|
|
delay,
|
|
cb,
|
|
onScroll,
|
|
lastScrollTop: containerEl.scrollTop
|
|
};
|
|
if (immediate) {
|
|
const observer = new MutationObserver(throttle(checkFull.bind(null, el, cb), CHECK_INTERVAL));
|
|
el[SCOPE].observer = observer;
|
|
observer.observe(el, { childList: true, subtree: true });
|
|
checkFull(el, cb);
|
|
}
|
|
container.addEventListener("scroll", onScroll);
|
|
},
|
|
unmounted(el) {
|
|
const { container, onScroll } = el[SCOPE];
|
|
container == null ? void 0 : container.removeEventListener("scroll", onScroll);
|
|
destroyObserver(el);
|
|
}
|
|
};
|
|
|
|
export { CHECK_INTERVAL, DEFAULT_DELAY, DEFAULT_DISTANCE, SCOPE, InfiniteScroll as default };
|
|
//# sourceMappingURL=index.mjs.map
|