trilium/src/public/app/widgets/backlinks.js

import NoteContextAwareWidget from "./note_context_aware_widget.js";
import linkService from "../services/link.js";
import server from "../services/server.js";
import froca from "../services/froca.js";

const TPL = `
<div class="backlinks-widget">
    <style>
        .backlinks-widget {
            position: relative;
        }
    
        .backlinks-ticker {
            position: absolute;
            top: 10px;
            right: 10px;
            width: 130px;
            border-radius: 10px;
            border-color: var(--main-border-color);
            background-color: var(--more-accented-background-color);
            padding: 4px 10px 4px 10px;
            opacity: 70%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 10;
        }
        
        .backlinks-count {
            cursor: pointer;
        }
        
        .backlinks-close-ticker {
            cursor: pointer;
        }
                
        .backlinks-items {
            z-index: 10;
            position: absolute;
            top: 50px;
            right: 10px;
            width: 400px;
            border-radius: 10px;
            background-color: #eeeeee;
            color: #444;
            padding: 20px;
            overflow-y: auto;
        }
        
        .backlink-excerpt {
            border-left: 2px solid var(--main-border-color);
            padding-left: 10px;
            opacity: 80%;
            font-size: 90%;
        }
        
        .backlink-excerpt .backlink-link { /* the actual backlink */
            font-weight: bold;
            background-color: yellow;
        }
        
        /* relation map has already buttons in that position */
        .type-relation-map .backlinks-ticker { top: 50px; }
        .type-relation-map .backlinks-items { top: 100px; }
    </style>
    
    <div class="backlinks-ticker">
        <span class="backlinks-count"></span>
        
        <span class="bx bx-x backlinks-close-ticker"></span> 
    </div>   
    
    <div class="backlinks-items" style="display: none;"></div>
</div>
`;

export default class BacklinksWidget extends NoteContextAwareWidget {
    doRender() {
        this.$widget = $(TPL);
        this.$count = this.$widget.find('.backlinks-count');
        this.$items = this.$widget.find('.backlinks-items');
        this.$ticker = this.$widget.find('.backlinks-ticker');

        this.$count.on("click", () => {
            this.$items.toggle();
            this.$items.css("max-height", $(window).height() - this.$items.offset().top - 10);

            if (this.$items.is(":visible")) {
                this.renderBacklinks();
            }
        });

        this.$closeTickerButton = this.$widget.find('.backlinks-close-ticker');
        this.$closeTickerButton.on("click", () => {
            this.$ticker.hide();

            this.clearItems();
        });

        this.contentSized();
    }

    async refreshWithNote(note) {
        this.clearItems();

        const targetRelationCount = note.getTargetRelations().length;
        if (targetRelationCount === 0) {
            this.$ticker.hide();
        }
        else {
            this.$ticker.show();
            this.$count.text(
                `${targetRelationCount} backlink`
                + (targetRelationCount === 1 ? '' : 's')
            );
        }
    }

    clearItems() {
        this.$items.empty().hide();
    }

    async renderBacklinks() {
        if (!this.note) {
            return;
        }

        this.$items.empty();

        const backlinks = await server.get(`note-map/${this.noteId}/backlinks`);

        if (!backlinks.length) {
            return;
        }

        await froca.getNotes(backlinks.map(bl => bl.noteId)); // prefetch all

        for (const backlink of backlinks) {
            this.$items.append(await linkService.createNoteLink(backlink.noteId, {
                showNoteIcon: true,
                showNotePath: true,
                showTooltip: false
            }));

            if (backlink.relationName) {
                this.$items.append($("<p>").text("relation: " + backlink.relationName));
            }
            else {
                this.$items.append(...backlink.excerpts);
            }
        }
    }
}