Truncate long text within a span.

ellipse_span.js

/**
 * Truncate long text within a span. Hover over span to see full text.
 *
 * @param {string} data   The text content to include between span elements if longer
 *                        than the specified maximum characters.
 * @param {integer} chars The maximum number of characters before truncating with an
 *                        ellipse.
 *
 * @return {string} The ellipsed span with the full text set as the title attribute if
 *                  the specified data is greater than the max characters, otherwise
 *                  the data is returned unaffected.
 */
function ellipse_span(data, chars = 50)
{
  return data.length > chars ?
    "<span title=\""+data+"\">"+data.substr(0,chars)+"...</span>"
    : data;
}