Javascript自动增加表格行、手动增加行、清除/复位行数据

//为表格主体添加单击事件,当单击时添加行数,使表格保持有5个空行
function autoRowsTable(tbodyID) {
    var tb = "";
    if (!document.getElementById(tbodyID)) {
        return;
    }
    if (!document.getElementById(tbodyID).tagName.toUpperCase()=="TBODY") {
        if (!document.getElementById(tbodyID).tBodies[0]) {
            return;
        } else {
            tb = document.getElementById(tbodyID).tBodies[0];
        }
    } else {
        tb = document.getElementById(tbodyID);
    }
    for (var i = 0; i < tb.rows.length; i++) {
		AddAutoRowsEvent(tb.rows[i]);
    }
}
//自动增加行
function autoRows(e) {
	var e = e || event;
	var obj = e.target || e.srcElement;
	while (obj.tagName != "TR") {
		obj = obj.parentNode;
	}
	var tb=obj.parentNode;
	var n = 4 - (tb.rows.length - obj.rowIndex);
	if (n > 0) {
		var row = obj.parentNode.lastChild.cloneNode(true);
		for (var j = 0; j < n; j++) {
			var newRow = row.cloneNode(true);
			//如果是IE则新克隆的节点不具备原来节点的默认值属性,此处重写新节点
			if (window.ActiveXObject) {
				for (var k = 0; k < newRow.childNodes.length; k++) {
					newRow.childNodes[k].innerHTML = obj.parentNode.lastChild.childNodes[k].innerHTML.replace(/jQuery\d+\=\"\d+\"/ig, "");
				}
			}
			tb.insertBefore(newRow, tb.rows[tb.rows.length - 1].nextSibling);
			//为新增加的行添加事件
			AddAutoRowsEvent(tb.rows[tb.rows.length - 1]);
		}
	}
}
//为指定行增加事件
function AddAutoRowsEvent(tr){
	if (tr.addEventListener) {
		tr.addEventListener("click", autoRows, false);
	} else if (tr.attachEvent) {
		tr.attachEvent("onclick", autoRows); // useCapture unsupported
	}
	var c = tr.cells.length;
	for (var j = 0; j < c; j++) {
		var childs = tr.cells[j].childNodes;
		for (var k = 0; k < childs.length; k++) {
			if (childs[k].type == "text" || childs[k].type == "textarea" || childs[k].type == "button") {
				if (childs[k].addEventListener) {
					childs[k].addEventListener("focus", autoRows, false);
				} else if (childs[k].attachEvent) {
					childs[k].attachEvent("onfocus", autoRows); // useCapture unsupported
				}
			}
		}
	}		
}

//在表格中指定位置插入指定行数,新插入的行内容为同一表格主体最后一行
//obj:行内的任意对象
//n:要增加的行数
//bAutoRows:是否要添加自动增加行的属性
function insertRow(obj, n, bAutoRows) {
    while (obj.tagName != "TR") {
        obj = obj.parentNode;
    }
    for (var i = 0; i < n; i++) {
        var cloneRow = obj.parentNode.lastChild.cloneNode(true);
        //如果是IE则新克隆的节点不具备原来节点的默认值属性,此处重写新节点
        if (window.ActiveXObject) {
            for (var k = 0; k < cloneRow.childNodes.length; k++) {
                cloneRow.childNodes[k].innerHTML = obj.parentNode.lastChild.childNodes[k].innerHTML.replace(/jQuery\d+\=\"\d+\"/ig, "");
            }
        }
        obj.parentNode.insertBefore(cloneRow, obj.nextSibling);
		if(bAutoRows){
			AddAutoRowsEvent(obj.nextSibling);
		}
    }
}
//清除指定行数据
//obj为行或者行内的节点
//startColnum:起始列
//endColumn:终止列
//isReset:是否恢复到初始值
function clearRowData(obj, startColnum, endColumn, isReset) {
    while (obj.tagName != "TR") {
        obj = obj.parentNode;
    }
    var cellsCount = obj.cells.length;                  //此行单元格总数
    if (startColnum < 0 || !startColnum) {             //如果未指定清除起始列则从第一列清除
        startColnum = 0;
    }
    if (endColumn > cellsCount - 1 || !endColumn) {     //如果未指定清除终止列则清除到最后一列前(通常最后一列用于放置清除按钮)
        endColumn = cellsCount - 1;
    }
    if (isReset == undefined) {
        isReset = false;
    }
    for (var c = startColnum; c <= endColumn; c++)		//循环各列,设置单元格里的控件值
    {
        for (var j = 0; j < obj.cells[c].childNodes.length; j++) {  //循环处理指定单元格中的子节点
            var node = obj.cells[c].childNodes[j];
            switch (node.type) {
                case "text":
                case "hidden":
                case "textarea":
                    if (isReset) {
                        node.value = node.defaultValue;
                    } else {
                        node.value = "";
                    }
                    break;

                case "select-one":
                case "select-multiple":
                    if (isReset) {
                        for (var k = node.options.length - 1; k >= 0; k--) {
                            node.options[k].selected = node.options[k].defaultSelected;
                        }
                    } else {
                        for (var k = node.options.length - 1; k >= 0; k--) {
                            node.options.remove(k);
                        }
                    }
                    break;
                case "checkbox":
                case "radio":
                    if (isReset) {
                        node.checked = node.defaultChecked;
                    } else {
                        node.checked = false;
                    }
                    break;
            }
        }
    }
}