119 lines
3.4 KiB
JavaScript
119 lines
3.4 KiB
JavaScript
import { ref, watch, computed, Teleport, nextTick, onMounted, defineComponent, onDeactivated, onActivated, createVNode as _createVNode, mergeProps as _mergeProps } from "vue";
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import { extend, addUnit, inBrowser, numericProp, getScrollTop, getZIndexStyle, createNamespace, makeNumericProp } from "../utils/index.mjs";
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import { throttle } from "../lazyload/vue-lazyload/util.mjs";
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import { useEventListener, getScrollParent } from "@vant/use";
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import { Icon } from "../icon/index.mjs";
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const [name, bem] = createNamespace("back-top");
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const backTopProps = {
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right: numericProp,
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bottom: numericProp,
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zIndex: numericProp,
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target: [String, Object],
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offset: makeNumericProp(200),
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immediate: Boolean,
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teleport: {
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type: [String, Object],
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default: "body"
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}
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};
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var stdin_default = defineComponent({
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name,
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inheritAttrs: false,
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props: backTopProps,
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emits: ["click"],
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setup(props, {
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emit,
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slots,
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attrs
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}) {
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let shouldReshow = false;
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const show = ref(false);
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const root = ref();
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const scrollParent = ref();
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const style = computed(() => extend(getZIndexStyle(props.zIndex), {
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right: addUnit(props.right),
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bottom: addUnit(props.bottom)
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}));
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const onClick = (event) => {
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var _a;
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emit("click", event);
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(_a = scrollParent.value) == null ? void 0 : _a.scrollTo({
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top: 0,
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behavior: props.immediate ? "auto" : "smooth"
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});
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};
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const scroll = () => {
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show.value = scrollParent.value ? getScrollTop(scrollParent.value) >= +props.offset : false;
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};
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const getTarget = () => {
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const {
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target
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} = props;
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if (typeof target === "string") {
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const el = document.querySelector(target);
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if (el) {
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return el;
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}
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if (process.env.NODE_ENV !== "production") {
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console.error(`[Vant] BackTop: target element "${target}" was not found, the BackTop component will not be rendered.`);
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}
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} else {
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return target;
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}
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};
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const updateTarget = () => {
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if (inBrowser) {
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nextTick(() => {
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scrollParent.value = props.target ? getTarget() : getScrollParent(root.value);
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scroll();
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});
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}
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};
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useEventListener("scroll", throttle(scroll, 100), {
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target: scrollParent
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});
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onMounted(updateTarget);
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onActivated(() => {
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if (shouldReshow) {
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show.value = true;
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shouldReshow = false;
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}
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});
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onDeactivated(() => {
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if (show.value && props.teleport) {
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show.value = false;
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shouldReshow = true;
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}
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});
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watch(() => props.target, updateTarget);
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return () => {
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const Content = _createVNode("div", _mergeProps({
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"ref": !props.teleport ? root : void 0,
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"class": bem({
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active: show.value
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}),
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"style": style.value,
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"onClick": onClick
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}, attrs), [slots.default ? slots.default() : _createVNode(Icon, {
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"name": "back-top",
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"class": bem("icon")
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}, null)]);
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if (props.teleport) {
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return [_createVNode("div", {
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"ref": root,
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"class": bem("placeholder")
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}, null), _createVNode(Teleport, {
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"to": props.teleport
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}, {
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default: () => [Content]
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})];
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}
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return Content;
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};
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}
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});
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export {
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backTopProps,
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stdin_default as default
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};
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