(function () {
var trows = document.getElementById('table_Return').rows, t = trows.length, trow, nextrow,
// rownum = document.getElementById('rownum'),
addEvent = (function () {
return window.addEventListener ? function (el, ev, f) {
el.addEventListener(ev, f, false); //modern browsers
} : window.attachEvent ? function (el, ev, f) {
el.attachEvent('on' + ev, function (e) { f.apply(el, [e]); }); //IE 8 and less
} : function () { return; }; //a very old browser (IE 4 or less, or Mozilla, others, before Netscape 6), so let's skip those
})();
// rownum.value = rownum.defaultValue; //reset for browsers that remember input values on reload
while (--t > -1) {
trow = trows[t];
trow.className = 'normal';
addEvent(trow, 'click', highlightRow);
}//end while
function highlightRow(gethighlight) { //now dual use - either set or get the highlighted row
gethighlight = gethighlight === true;
var t = trows.length;
while (--t > -1) {
trow = trows[t];
if (gethighlight && trow.className === 'highlighted') { return t; }
else if (!gethighlight) {
if (trow !== this) { trow.className = 'normal'; }
else if (this.className === 'normal') {
//rownum.value = t;
}
else {
//rownum.value = rownum.defaultValue;
}
}
}//end while
return gethighlight ? null : this.className = this.className === 'highlighted' ? 'normal' : 'highlighted';
}//end function
function movehighlight(way, e) {
e.preventDefault && e.preventDefault();
e.returnValue = false;
var idx = highlightRow(true); //gets current index or null if none highlighted
if (typeof idx === 'number') {//there was a highlighted row
idx += way; //increment\decrement the index value
if (idx && (nextrow = trows[idx])) { return highlightRow.apply(nextrow); } //index is > 0 and a row exists at that index
else if (idx) { return highlightRow.apply(trows[1]); } //index is out of range high, go to first row
return highlightRow.apply(trows[trows.length - 1]); //index is out of range low, go to last row
}
return highlightRow.apply(trows[way > 0 ? 1 : trows.length - 1]); //none was highlighted - go to 1st if down arrow, last if up arrow
}//end function
function processkey(e) {
switch (e.keyCode) {
case 38: {//up arrow
return movehighlight(-1, e)
}
case 40: {//down arrow
return movehighlight(1, e);
}
default: {
return true;
}
}
}//end function
addEvent(document, 'keydown', processkey);
addEvent(window, 'unload', function () { }); //optional, resets the page for browsers that remember the script state on back and forward buttons
}/* end function */)();//execute function and end script
