Trim a block of text to a specified amount of characters.

text.excerpt.js

/**
 * Trim a block of text to a specified amount of characters.
 *
 * @param  string   elem    string to 'cut'.
 * @param  integer  length  Character count/length. Default 30.
 * @param  string   more    Text to display as 'more'. Default '...'
 *
 * @return  string
 */
$.textExcerpt = function (elem, length, more) {
    if ('undefined' == typeof elem || '' == elem) {
        return false;
    }

    length = length || 30,
    more = more || '...';

    var cut = elem.indexOf(' ', length);
    if (-1 == cut) {
        return elem + more;
    }

    return elem.substring(0, cut) + more;
};