Plugin für alterierende Tabellenfarben

/*
Alternating row color script by Joost de Valk ( http://www.joostdevalk.nl/ ) to add alternating row classes to a table.
Copyright (c) 2006 Joost de Valk.
*/


/* Don't change anything below this unless you know what you're doing */
addEvent(window, "load", alternate_init);


function alternate_init() {
    // Find all tables with class sortable and make them sortable
    if (!document.getElementsByTagName) return;
    tbls = document.getElementsByTagName("table");
    for (ti=0;ti<tbls.length;ti++) {
        thisTbl = tbls[ti];
        if (((' '+thisTbl.className+' ').indexOf("alternate_rows") != -1) && (thisTbl.id)) {
            alternate(thisTbl);
        }
    }
}


function addEvent(elm, evType, fn, useCapture)
// addEvent and removeEvent
// cross-browser event handling for IE5+,    NS6 and Mozilla
// By Scott Andrew
{
    if (elm.addEventListener){
        elm.addEventListener(evType, fn, useCapture);
        return true;
    } else if (elm.attachEvent){
        var r = elm.attachEvent("on"+evType, fn);
        return r;
    } else {
        alert("Handler could not be removed");
    }
} 


function replace(s, t, u) {
  /*
  **  Replace a token in a string
  **    s  string to be processed
  **    t  token to be found and removed
  **    u  token to be inserted
  **  returns new String
  */
  i = s.indexOf(t);
  r = "";
  if (i == -1) return s;
  r += s.substring(0,i) + u;
  if ( i + t.length < s.length)
    r += replace(s.substring(i + t.length, s.length), t, u);
  return r;
}


function alternate(table) {
    // Take object table and get all it's tbodies.
    var tableBodies = table.getElementsByTagName("tbody");
    // Loop through these tbodies
    for (var i = 0; i < tableBodies.length; i++) {
        // Take the tbody, and get all it's rows
        var tableRows = tableBodies[i].getElementsByTagName("tr");
        // Loop through these rows
        for (var j = 0; j < tableRows.length; j++) {
            // Check if j is even, and apply classes for both possible results
            if ( (j % 2) == 0  ) {
                if (tableRows[j].className == 'odd' || !(tableRows[j].className.indexOf('odd') == -1) ) {
                    tableRows[j].className = replace(tableRows[j].className, 'odd', 'even');
                } else {
                    tableRows[j].className += " even";
                }
            } else {
                if (tableRows[j].className == 'even' || !(tableRows[j].className.indexOf('even') == -1) ) {
                    tableRows[j].className = replace(tableRows[j].className, 'even', 'odd');
                }
                tableRows[j].className += " odd";
            } 
        }
    }
}