collapse-transition.js
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// Thanks to https://github.com/ElemeFE/element/blob/dev/src/transitions/collapse-transition.js
import { addClass, removeClass } from '../../utils/assist';
const Transition = {
beforeEnter(el) {
addClass(el, 'collapse-transition');
if (!el.dataset) el.dataset = {};
el.dataset.oldPaddingTop = el.style.paddingTop;
el.dataset.oldPaddingBottom = el.style.paddingBottom;
el.style.height = '0';
el.style.paddingTop = 0;
el.style.paddingBottom = 0;
},
enter(el) {
el.dataset.oldOverflow = el.style.overflow;
if (el.scrollHeight !== 0) {
el.style.height = el.scrollHeight + 'px';
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
} else {
el.style.height = '';
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
}
el.style.overflow = 'hidden';
},
afterEnter(el) {
// for safari: remove class then reset height is necessary
removeClass(el, 'collapse-transition');
el.style.height = '';
el.style.overflow = el.dataset.oldOverflow;
},
beforeLeave(el) {
if (!el.dataset) el.dataset = {};
el.dataset.oldPaddingTop = el.style.paddingTop;
el.dataset.oldPaddingBottom = el.style.paddingBottom;
el.dataset.oldOverflow = el.style.overflow;
el.style.height = el.scrollHeight + 'px';
el.style.overflow = 'hidden';
},
leave(el) {
if (el.scrollHeight !== 0) {
// for safari: add class after set height, or it will jump to zero height suddenly, weired
addClass(el, 'collapse-transition');
el.style.height = 0;
el.style.paddingTop = 0;
el.style.paddingBottom = 0;
}
},
afterLeave(el) {
removeClass(el, 'collapse-transition');
el.style.height = '';
el.style.overflow = el.dataset.oldOverflow;
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
}
};
export default {
name: 'CollapseTransition',
functional: true,
render(h, { children }) {
const data = {
on: Transition
};
return h('transition', data, children);
}
};