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Javascript webcomponent online spreadsheet

Create a online javascript spreadsheet using Jspreadsheet Ce.

Javascript

class Jspreadsheet extends HTMLElement {
    constructor() {
        super();
    }

    init(o) {
        // Shadow root
        const shadowRoot = this.attachShadow({mode: 'open'});

        // Style
        const css = document.createElement('link');
        css.rel = 'stylesheet';
        css.type = 'text/css'
        css.href = 'https://bossanova.uk/jexcel/v4/jexcel.css';
        shadowRoot.appendChild(css);

        const css2 = document.createElement('link');
        css2.rel = 'stylesheet';
        css2.type = 'text/css'
        css2.href = 'https://bossanova.uk/jexcel/v4/jsuites.css';
        shadowRoot.appendChild(css2);

        // Jspreadsheet container
        var container = document.createElement('div'); 
        shadowRoot.appendChild(container);

        // Create element
        this.el = jspreadsheet(container, {
            root: shadowRoot,
            minDimensions: [10,10]
        });
    }

    connectedCallback() {
        this.init(this);
    }

    disconnectedCallback() {
    }

    attributeChangedCallback() {
    }
}

window.customElements.define('j-spreadsheet', Jspreadsheet);

HTML

<html>
<script type="text/javascript" src="/jexcel/v4/jexcel.js"></script>
<script type="text/javascript" src="/jsuites/v3/jsuites.js"></script>
<script type="text/javascript" src="/jexcel/v4/jexcel.webcomponent.js"></script>

<j-spreadsheet></j-spreadsheet>

</html>