asp.net mvc checkbox 全选/反选 多选获取值

1.新建一个隐藏域

<input type="hidden" name="checkValue" id="checkValue" value="" />

2.

<th>

 全选

<input type="checkbox" name="checkAll" id="checkAll" onclick="swapCheck()" />

</th>

<td>

<input type="checkbox" name="checkId" id="checkId" value="@item.ImageId" onchange="Getcheckbox()"/>

</td>

3.写 JS

 <script type="text/javascript">

        //checkbox 全选/取消全选

        var isCheckAll = false;

        function swapCheck() {

            if (isCheckAll) {

                $("input[type='checkbox']").each(function () {

                    this.checked = false;

                    Getcheckbox();

                });

                isCheckAll = false;

            } else {

                $("input[type='checkbox']").each(function () {

                    this.checked = true;

                    Getcheckbox();

                });

                isCheckAll = true;

            }

        }

        function Getcheckbox() {

            var str = document.getElementsByName("checkId");

            var objarray = str.length;

            var chestr = "";

            for (i = 0; i < objarray; i++) {

                if (str[i].checked == true) {

                    chestr += str[i].value + ":";

                }

            }

            document.getElementById("checkValue").value = chestr;

        }

    </script>