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shelf.js
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shelf.js
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import { LitElement, html } from 'lit-element';
import client from '@greenwood/cli/data/client';
import MenuQuery from '@greenwood/cli/data/queries/menu';
import css from './shelf.css';
import chevronRt from '../icons/chevron-right/chevron-right';
import chevronDwn from '../icons/chevron-down/chevron-down';
class Shelf extends LitElement {
static get properties() {
return {
page: {
type: String
}
};
}
constructor() {
super();
this.page = '';
this.selectedIndex = '';
this.shelfList = [];
}
async connectedCallback() {
super.connectedCallback();
this.collapseAll();
}
goTo(path) {
location.hash = path;
window.history.pushState({}, '', path);
}
expandRoute(path) {
let routeShelfListIndex = this.shelfList.findIndex(list => {
let expRoute = new RegExp(`^${path}$`);
return expRoute.test(list.item.link);
});
if (routeShelfListIndex > -1) {
this.shelfList[routeShelfListIndex].selected = true;
this.selectedIndex = routeShelfListIndex;
}
}
collapseAll() {
this.shelfList = this.shelfList.map(item => {
item.selected = false;
return item;
});
}
toggleSelectedItem() {
let selectedShelfListIndex = this.shelfList.findIndex((list, index) => {
return index === this.selectedIndex;
});
if (selectedShelfListIndex > -1) {
this.shelfList[selectedShelfListIndex].selected = !this.shelfList[selectedShelfListIndex].selected;
}
}
setSelectedItem(evt) {
const previousSelected = this.selectedIndex;
this.selectedIndex = parseInt(evt.target.id.substring(6, evt.target.id.length), 10);
if (this.selectedIndex === previousSelected) {
this.selectedIndex = '';
}
this.toggleSelectedItem();
}
handleClick(evt) {
// collapse all other items
this.collapseAll();
// set selected to index
this.setSelectedItem(evt);
// force re-render
this.requestUpdate();
}
async fetchShelfData() {
return await client.query({
query: MenuQuery,
variables: {
name: 'side',
route: `/${this.page}/`,
order: 'index_asc'
}
});
}
async updated(changedProperties) {
if (changedProperties.has('page') && this.page !== '' && this.page !== '/') {
const response = await this.fetchShelfData();
this.shelfList = response.data.menu.children;
this.expandRoute(window.location.pathname);
this.requestUpdate();
}
}
renderList() {
/* eslint-disable indent */
const renderListItems = (list, selected) => {
let listItems = '';
if (list && list.length > 0) {
listItems = html`
<ul>
${list.map(({ item }, index) => {
return html`
<li id="index_${index}" class="${selected ? '' : 'hidden'}"><a @click=${()=> this.goTo(`${item.link}`)}">${item.label}</a></li>
`;
})}
</ul>
`;
}
return listItems;
};
/* eslint-enable */
return this.shelfList.map(({ item, children, selected }, index) => {
let id = `index_${index}`;
let chevron = children && children.length > 0
? selected === true ? chevronDwn : chevronRt
: '';
return html`
<li class="list-wrap">
<a id="${id}" href="${item.link}" @click="${this.handleClick}"><span>${item.label}</span><span>${chevron}</span></a>
<hr>
${renderListItems(children, selected)}
</li>
`;
});
}
render() {
return html`
<style>
${css}
</style>
<div>
<ul>
${this.renderList()}
</ul>
</div>
`;
}
}
customElements.define('eve-shelf', Shelf);