JSFiddle - React, Tailwind, and code Playground

by David Thomas

HTML

<ul>
    <li class="midEllipsis">abcdefghijklm</li>
</ul>

JavaScript

function centralEllipsis(opts) {
    var settings = {
        'maxLength': 7,
            'ellipsis': '&hellip;',
            'writeToAttribute': 'data-originaltext'
    },
    _this = this;

    for (var prop in opts) {
        if (opts.hasOwnProperty(prop)) {
            settings[prop] = 'undefined' !== typeof opts[prop] ? opts[prop] : settings[prop];
        }
    }

    var prefixLength = Math.ceil(settings.maxLength / 2),
        suffixLength = settings.maxLength - prefixLength,
        originalText = _this.title = _this.textContent,
        prefix, suffix;

    if (settings.maxLength < originalText.length) {

        _this.setAttribute(settings.writeToAttribute, originalText);

        prefix = originalText.substr(0, prefixLength);
        suffix = settings.maxLength < 2 ? '' : originalText.substr(-suffixLength);

        _this.innerHTML = prefix + settings.ellipsis + suffix;
    }

}

Array.prototype.forEach.call(document.querySelectorAll('.midEllipsis'), function (el) {
    centralEllipsis.apply(el, [{}]);
});