islandora/form_elements/js/jquery.breakly-1.0.js

/**
 * jQuery Breakly plugin - Breaks your texts. Gently.
 * This plugin can be used to give the browser an "hint" on when (and eventually how) break
 * some long texts that are wrapped in a container with an explicitely defined width.
 * It works adding a "special" unicode character after the given number of characters.
 * By default the plugin inserts U+200B (the zero width space), but you can specify any
 * other character as the second parameter
 *
 * @name jquery-breakly-1.0.js
 * @author Claudio Cicali - http://claudio.cicali.name
 * @version 1.0
 * @date December 22, 2009
 * @category jQuery plugin
 * @copyright (c) 2009 Claudio Cicali ( http://claudio.cicali.name )
 * @license CC Attribution-No Derivative Works 2.5 Brazil - http://creativecommons.org/licenses/by-nd/2.5/br/deed.en_US
 * @examples
 *   $('h3').breakly(3); // "breaks" any h3 text (and any h3's children text too) inserting a \U+200B after every 3 characters
 *   $('h3').breakly(3, 0x202f); // Same as above, but inserts a "NARROW NO-BREAK SPACE" (just for the fun of it)
 
 * Visit http://lab.web20.it/breakly/example.html
 * List of Unicode spaces: http://www.cs.tut.fi/~jkorpela/chars/spaces.html
 */
$.fn.breakly = function(chopAt, spaceCode) {
    spaceCode |= 8203;  // U+200B ZERO WIDTH SPACE
    var zw = String.fromCharCode(spaceCode), re = new RegExp(/\B/), orig, idx, chopped, ch;
    function breakly(node) {
        if (3 == node.nodeType && (orig = node.nodeValue).length > chopAt) {
            idx = 0;
            chopped=[];
            for (var i=0; i < orig.length; i++) {
                ch = orig.substr(i,1);
                chopped.push(ch);
                if (null != ch.match(re)) {
                    idx=0;
                    continue;
                }
                if (++idx == chopAt) {
                    ch = orig.substr(i+1,1); // look ahead
                    if (ch && null == ch.match(re)) {
                        chopped.push(zw);
                        idx=0;
                    }
                }
            }
            node.nodeValue = chopped.join('');
        } else {
            for (var i=0; i < node.childNodes.length; i++) {
                breakly(node.childNodes[i]);
            }
        }
    }

    return this.each(function() {
        breakly(this);
    })
}