选中的复选框始终返回false [英] Checkbox checked always returns false

问题描述

大家好，

我在asp：Gridview中有Header和Item CheckBox，如下所示。

 <  列 >  
 <   asp：TemplateField     HeaderText   =  CheckAll > ;  
 <   HeaderStyle     Horizo​​ntalAlign   = 左   宽度  =  2％    /  >  
 <   HeaderTemplate  >  
 <   asp：CheckBox     ID   =  cbxHdrPresent    onclick   =  javasrcipt：checkAllBoxes（this）;  
   
       runat   =  server   样式  =  cursor：pointer;   宽度  =  10    /  >  
 <   / HeaderTemplate  >  
 <   ItemTemplate  >  
 <   asp：CheckBox     ID   =  cbxItmPresent    AutoPostBack   =  false    EnableViewState   =  true    ViewStateMode   = 已启用   < span class =code-attribute>已启用  =  true    runat   = 服务器    /  >  
 <   / ItemTemplate  >  
 <   ControlSty le    宽度  =  4px    /  >  
 <   FooterStyle     Horizo​​ntalAlign   = 左    /  >  
 <   / asp：TemplateField   >  
 .... 

并且，

使用以下Javascript，将选中复选框/未选中。

  function  checkAllBoxes（headerchk）{ 
  //   var gvcheck = document.getElementById（'GridView1'）;  
  var  gvcheck =  document  .getElementById（' <％= gvPresent.ClientID％>'）; 
  var  i，j; 
 
  var  inputs = gvcheck.getElementsByTagName（' 输入）; 
 j = inputs.length; 
  //  选中或不选中标题复选框的条件如果为真，则选中所有复选框 
  if （headerchk.checked）{
  for （i =  0 ; i< j; i ++）{
 inputs [i] .Check =  true ; 
 inputs [i] .style.backgroundColor = ' ＃F5B325'; 
} 
} 
  //  如果条件失败，请取消选中gridview中的所有复选框 
  else  {
  for （i =  0 ; i< j; i ++）{
 inputs [i] .checked =  false ; 
 inputs [i] .removeAttribute（  style）; 
} 
} 
} 

  public   void  ProcessDailyAttendance（ string  status，GridView GridViewControl，DateTime AttendanceDate）
 {
  foreach （GridViewRow grdRow1  in  GridViewControl.Rows）
 {
 CheckBox chkBoxPresent =（CheckBox）GridViewControl.Rows [grdRow1.RowIndex] .FindControl（  cbxItmPresent）; 
  if （chkBoxPresent.Checked ==  true ）<<  - 返回FALSE甚至如果 CHECKED  - >> 
 {
 .... 
} 
} 

相同的代码在实时工作正常。

现在我们用母版页升级这个页面。是否有任何冲突，使用母版页。？

请帮帮我。

谢谢，

Rajan。

解决方案

使用此代码并检查并确保在回发后未再次加载gridview。

  for （ int  i = < span class =code-digit> 0 ; i <  gvBrowse.Rows.Count; i ++）
 {
 CheckBox chk =（CheckBox）gvBrowse.Rows [i] .FindControl（  cbxItmPresent）; 
  if （chk.Checked）
 {
} 
} 

是的，当你包含母版页时，你的当前代码会有冲突

现在当前的页面html代码被ContentPlaceHolder1包围。



您需要更改checkallBoxes的javascript函数以适应这种变化。



函数应该包含这样的



var RowCount = document.getElementById（'ctl00_ContentPlaceHolder1_gvPresent'）。rows.length;



如果页面使用母版页的ContentPlaceHolderID。 br />

< asp：Content ID =   content1 ContentPlaceHolderID =   ContentPlaceHolder1 
 runat =  服务器> 

Hi all,
I have Header and Item CheckBox inside a asp:Gridview as follows.

<Columns>
<asp:TemplateField HeaderText="CheckAll">
	<HeaderStyle HorizontalAlign="Left" Width="2%" />
	<HeaderTemplate>
		<asp:CheckBox ID="cbxHdrPresent" onclick="javasrcipt:checkAllBoxes(this);"

		runat="server" Style="cursor: pointer;" Width="10" />
	</HeaderTemplate>
	<ItemTemplate>
		<asp:CheckBox ID="cbxItmPresent" AutoPostBack="false" EnableViewState="true" ViewStateMode="Enabled" Enabled="true" runat="server" />
	</ItemTemplate>
	<ControlStyle Width="4px" />
	<FooterStyle HorizontalAlign="Left" />
</asp:TemplateField>
....

And,
Using the follwing Javascript, check boxes will be checked/unchecked.

function checkAllBoxes(headerchk) {
            //var gvcheck = document.getElementById('GridView1');
            var gvcheck = document.getElementById('<%=gvPresent.ClientID%>');
            var i, j;

            var inputs = gvcheck.getElementsByTagName('input');
            j = inputs.length;
            //Condition to check header checkbox selected or not if that is true checked all checkboxes
            if (headerchk.checked) {
                for (i = 0; i < j; i++) {
                    inputs[i].Check = true;
                    inputs[i].style.backgroundColor = '#F5B325';
                }
            }
            //if condition fails uncheck all checkboxes in gridview
            else {
                for (i = 0; i < j; i++) {
                    inputs[i].checked = false;
                    inputs[i].removeAttribute("style");
                }
            }
        }

public void ProcessDailyAttendance(string status,GridView GridViewControl,DateTime AttendanceDate)
  {
   foreach (GridViewRow grdRow1 in GridViewControl.Rows)
     {
      CheckBox chkBoxPresent = (CheckBox)GridViewControl.Rows[grdRow1.RowIndex].FindControl("cbxItmPresent");
    if (chkBoxPresent.Checked == true)     <<-- This returns FALSE even if CHECKED ->>
    {
       ....
    }
}

The same codes are working fine in live.
Now we upgrading this page with master pages. Is there any conflicts, working with master page.?
Please help me out.
Thanks,
Rajan.

解决方案

use this code and check and make sure that the gridview is not loaded again after postback.

for (int i = 0; i < gvBrowse.Rows.Count; i++)
{
     CheckBox chk = (CheckBox)gvBrowse.Rows[i].FindControl("cbxItmPresent");
     if (chk.Checked)
     {
     }
}

Yes there will be conflicts with your current code when you include the master page
Now the current page html code surrounded with the ContentPlaceHolder1.

You need to change the javascript function for checkallBoxes to suit with this changes.

function should include like this

var RowCount=document.getElementById('ctl00_ContentPlaceHolder1_gvPresent').rows.length;

if the page use master page's ContentPlaceHolderID.

<asp:Content ID="content1" ContentPlaceHolderID="ContentPlaceHolder1"
    runat="Server">

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