jQuery.Excel, 使用Ctrl+方向键/Home/End在input表格中移动

// Enable user to move focus in a grid of inputs with Ctrl + Up, Down, Left, Right, Home, End
// Could be called again after more rows are created.
// deerchao@gmail.com 2009-2-23

// usage:
//--------------Html----------------
// <tr class="dataRow">
// <td><input /></td>
// <td><input /></td>
// <td><input /></td>
// </tr>
// <tr class="dataRow">
// <td><input /></td>
// <td><input /></td>
// <td><input /></td>
// </tr>
//--------------Script-------------
// jQuery.excel('dataRow');

jQuery.extend({
excel: function(rowClass) {
var keys = { left: 37, up: 38, right: 39, down: 40, home: 36, end: 35 };
rowClass = rowClass ? rowClass : '.excel';
if (rowClass[0] != '.')
rowClass = '.' + rowClass;

$(rowClass).unbind('keyup',onkeyup).bind('keyup',onkeyup);

function onkeyup(evt) {
var ctrlOnly = evt.ctrlKey && !evt.altKey && !evt.shiftKey;
switch (evt.keyCode) {
case keys.down:
go("down");
break;
case keys.up:
go("up");
break;
case keys.left:
if (ctrlOnly)
go("left");
break;
case keys.right:
if (ctrlOnly)
go("right");
break;
case keys.home:
if (ctrlOnly)
go("home");
break;
case keys.end:
if (ctrlOnly)
go("end");
break;
}

function go(to) {
var td = $(evt.target).closest('td');
var tr = $(evt.currentTarget);
var toFocus = null;
switch (to) {
case 'home':
toFocus = lastInput(td.prevAll('td'));
break;
case 'end':
toFocus = lastInput(td.nextAll('td'));
break;
case 'left':
toFocus = firstInput(td.prevAll('td'));
if (!toFocus)
toFocus = lastInput(tr.prev('tr' + rowClass).children('td'));
break;
case 'right':
toFocus = firstInput(td.nextAll('td'));
if (!toFocus)
toFocus = firstInput(tr.next('tr' + rowClass).children('td'));
break;
case 'up':
toFocus = firstInput(tr.prev('tr' + rowClass).children('td'), td.prevAll('td').size());
break;
case 'down':
toFocus = firstInput(tr.next('tr' + rowClass).children('td'), td.prevAll('td').size());
break;
}
if (toFocus) {
toFocus.focus();
}
}

function firstInput(tds, start) {
if (!start)
start = 0;
for (var i = start; i < tds.size(); i++) {
var inputs = $(tds[i]).children('input, select, textarea');
if (inputs.size())
return inputs[0];
}
return null;
}

function lastInput(tds) {
for (var i = tds.size() - 1; i >= 0; i--) {
var inputs = $(tds[i]).children('input, select, textarea');
if (inputs.size())
return inputs[0];
}
return null;
}
}
}
});