javascript - 如果没有选择单选按钮，则显示alert()

Question

单击“删除”按钮后，如果未选择任何单选按钮，如何显示警报。我的 html 表单

<form name="Action" method="post" action="RequestAction">
                    <table width="800px" cellpadding="5" style="color:black; border-top:1px solid #ccc;" border="0">
                    </table>
                    <div id="container">
                    <div id="demo_jui">
                    <table id="requestList" class="display" cellpadding="0" cellspacing="0" border="0" style="font-size:12px;" >
                    <thead id="headed">
                        <tr>
                            <th  align="center" title="Employee">Employee</th>
                            <th  align="center" title="Number of Days">Number of Days</th>
                            <th  align="center" title="Start Date">Start Date</th>
                            <th  align="center" title="End Date">End Date</th>
                            <th  align="center" title="Leave Type">Leave Type</th>
                            <th  align="center" title="Remark">Remark</th>
                            <th  align="center">Approve</th>
                            <th  align="center">Reject</th>
                        </tr>
                    </thead>
                    <tbody></tbody>
                    </table>
                    </div>
                    </div>
                        <table>                 
                        <tr>
                            <td style="padding-left:0px;" colspan="3">
                                <a href="#"><img src="images/Submit.png" style="border:none;" onClick="javascript:Go()"
                                onmouseover="this.src='images/Submit_Hover.png'" onmouseout="this.src='images/Submit.png'"/></a>
                                &nbsp;&nbsp;&nbsp;
                                <a href="#"><img src="images/Reset.png" style="border:none;" onClick="javascript:clearForm()"
                                onmouseover="this.src='images/Reset_Hover.png'" onmouseout="this.src='images/Reset.png'"/></a>
                            </td>
                        </tr>
                    </table>
                </form>

单选按钮值将在表中检索。当我测试它时，如果单击提交按钮而不选择任何单选按钮，我将收到错误

在函数Go()中，验证单选按钮的方式是否正确？谢谢

function Go() {
                if( $('form[name=Action] input[name=statusList]:checked').length == 0)
                {
                    $('form[name=Action]').submit();
                }
                else
                {
                    alert("Please select at least one to delete");
                }
            }

Answer 1

也许检查“已检查”状态不起作用？

//read value of radio button
alert($("input[name='radio-button-group']:checked").val());

//get bool, if radio button is checked
alert(typeof $("input[name='radio-button-group']:checked").val() != 'undefined');

来源(德语):http://mabraham.de/jquery-radio-buttons-auslesen-und-manipulieren/