用js判断checkbox是否选中

Question

我的DataList里面绑了checkbox，我是用的asp:checkbox，现在要用js判断是否选中其中一个checkbox,如果选中的话就隐藏掉btndel，btnupdata，btnsumbit这三个按钮,但是我每次执行页面都Autopostback一次了,我的checkbox一直都是false
大家有没有什么好的方法教教我，谢谢

Answer 1

我想只有第一次选中DataList里面的checkbox才隐藏掉这三个按钮,如果已隐掉了,就不会在执行隐藏按钮的事件了....有没有什么好方法

Answer 2

是不是要前台给checkbox写事件 ？

Answer 3

回发的时候、从新绑定数据是否在IsPostBack里面呢？
If(!IsPostBack)
{
  Bind();
}

Answer 4

以前写的，希望对你有用 ：http://blog.csdn.net/taomanman/article/details/6785904    <script language="javascript" type="text/javascript">  
         <pre name="code" class="javascript">         /*被选中*/  
         function OnCheck(event) {  
             var obj = event.srcElement ? event.srcElement : event.target;  
             if (obj.type == "checkbox") {  
                 clearSelectedItems(obj.parentNode.parentNode)  
                 return;  
             }  
             clearSelectedItems(obj.parentNode);   //清空选择项  
             var cbArr = obj.parentNode.cells[0].getElementsByTagName("input");  
             if (cbArr.length > 0 && cbArr[0].type == "checkbox") {  
                 cbArr[0].checked = !cbArr[0].checked;  
             }  
         }  
      
         /*清空选择项*/  
         function clearSelectedItems(row) {  
             var myTable = document.getElementById("myTable");  
             var cbArr = myTable.getElementsByTagName("input");  
             for (var i = 0; i < cbArr.length; i++) {  
                 if (cbArr[i].parentNode.parentNode != row) {  
                     if (cbArr[i].type == "checkbox" && cbArr[i].checked) {  
                         cbArr[i].checked = false;  
                     }  
                 }  
             }  
         }  
           
         function Focus(obj) {  
             obj.style.backgroundColor = '#D8F79D';  
         }  
         //颜色恢复为白色  
         function UnFocus(obj) {  
             obj.style.backgroundColor = '#ffffff';  
         }  
     </script>      <table width="100%" id="myTable" cellspacing="0" cellpadding="2" size="15" class="dataTable">  
          <tbody>  
              <tr class="dataTableHead">  
                  <td width="5%" height="30" align="center">  
                      <strong>选择</strong>  
                  </td>  
                  <td width="15%" style="cursor: pointer" align="center">  
                      <strong>书籍图片</strong>  
                  </td>  
                  <td width="15%" align="center">  
                      <strong>书名</strong>  
                  </td>  
                  <td width="15%" align="center">  
                      <strong>作者</strong>  
                  </td>  
                  <td width="10%" style="cursor: pointer;" align="center">  
                      <strong>书籍类别</strong>  
                  </td>  
                  <td width="15%" align="center">  
                      <strong>已阅读此书人数</strong>  
                  </td>  
                  <td width="15%" align="center">  
                      <strong>是否必读</strong>  
                  </td>  
                  <td width="10%" align="center">  
                      <strong>查看详情</strong>  
                  </td>  
              </tr>  
              <asp:Repeater ID="rp_list" runat="server"   
                  OnItemDataBound="rp_list_ItemDataBound">  
                  <ItemTemplate>  
                      <tr onmouseover="Focus(this)"  style="cursor: pointer" onmouseout="UnFocus(this)" onclick="OnCheck(event)">  
                          <td align="center">  
                              <input type="checkbox" id="cb_i" name="cb_i" value="<%#Eval("BookID") %>" class="inputCheckbox" />  
                          </td>  
                          <td align="center">  
                              <asp:Image ID="Image1" ToolTip='<%#Eval("BookName") %>' runat="server" Width="80"  
                                  Height="100" ImageUrl='<%#Eval("BookPic")%>' />  
                          </td>  
                          <td align="center">  
                              <%# Eval("BookName")%>  
                          </td>  
                          <td align="center">  
                              <%# Eval("Author")%>  
                          </td>  
                          <td align="center">  
                              <%#getBookCategoryNameById(int.Parse(Eval("BookCategoryID").ToString()))%>  
                          </td>  
                          <td align="center">  
                              <asp:LinkButton ID="lb" runat="server" Text='<%# getBookReadCounter(int.Parse(Eval("BookID").ToString()))%>'  
                                  CommandArgument='<%#Eval("BookID")%>'></asp:LinkButton>  
                          </td>  
                          <td align="center">  
                              <asp:Label ID="lblMustRead" runat="server" Text='<%# getIsMustRead(int.Parse(Eval("IsMustRead").ToString()))%>'></asp:Label>  
                          </td>  
                          <td align="center">  
                              <asp:ImageButton ID="ibSeeDetail" ImageUrl="~/Admin/images/details.jpg" OnClientClick="SeeTemplate();"  
                                  CommandArgument='<%#Eval("BookID") %>' ToolTip="查看详细信息" runat="server" />  
                          </td>  
                      </tr>  
                  </ItemTemplate>  
              </asp:Repeater>  
              <tr>  
                  <td colspan="8" align="left">  
                      <webdiyer:AspNetPager Style="float: right;" PageSize="3" ID="AspNetPager1" runat="server"  
                          CustomInfoHTML="" FirstPageText="第一页" LastPageText="最末页" NextPageText="下一页" PrevPageText="上一页"  
                          OnPageChanged="AspNetPager1_PageChanged" ShowPageIndexBox="Never" UrlPaging="false"  
                          Width="100%" ShowCustomInfoSection="Left" SubmitButtonClass="inputButton" SubmitButtonText="转跳"  
                          PageIndexBoxType="DropDownList" PageIndexOutOfRangeErrorMessage="您访问的地址不正确！">  
                      </webdiyer:AspNetPager>  
                  </td>  
              </tr>  
          </tbody>  
      </table>  

Answer 5

已经把事件绑在这里面了,还是不行有没有具体点的方法能实现的
If(!IsPostBack)
{
  Bind();
}

Answer 6

我是asp:chec,,能不换成input的吗

Answer 7

checkbox控件最后在页面上就是input啊，是可以的

Answer 8

  <asp:CheckBox ID="cb" runat="server" onclick="onCheck()"/>
 然后我在写个js的方法onCheck()这可以,但是我不知道怎么判断隐藏了按钮,checkbox的状态还是等于
true,,我没点一下这个checkbox都执行了一下页面就AutoPostBack了,checkbox又没被选中了..
我就是想既隐藏了又不让checkbox不会被false

Answer 9

If(!IsPostBack)
{
  Bind();
}这个难道有误吗？求解！！

Answer 10

每次Postback后,后台再把JS再调用一遍

Answer 11

用 js做 不要让 CheckBox  AutoPostBack