@antv/x6/es/registry/attr/title.js

JavaScript diagramming library that uses SVG and HTML for rendering

import { Dom } from '../../common';
export const title = {
    qualify(title, { elem }) {
        // HTMLElement title is specified via an attribute (i.e. not an element)
        return elem instanceof SVGElement;
    },
    set(val, { elem }) {
        const cacheName = 'x6-title';
        const title = `${val}`;
        const cache = Dom.data(elem, cacheName);
        if (cache == null || cache !== title) {
            Dom.data(elem, cacheName, title);
            // Generally SVGTitleElement should be the first child
            // element of its parent.
            const firstChild = elem.firstChild;
            if (firstChild && firstChild.tagName.toUpperCase() === 'TITLE') {
                // Update an existing title
                const titleElem = firstChild;
                titleElem.textContent = title;
            }
            else {
                // Create a new title
                const titleNode = document.createElementNS(elem.namespaceURI, 'title');
                titleNode.textContent = title;
                elem.insertBefore(titleNode, firstChild);
            }
        }
    },
};
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