I have a scenario as below. There are 3 check boxes.3 textbox associated with each.Grid gets populated on entering a search value in the textbox.On selecting a row on this grid,I need to hide the grid and selected value(one column) is populated into another textbox.I am getting "Object reference not set to an instance of an object.",when I implementing the logic for hiding the grid.Checkbox checked,value entered in search textbox,grid is populated ,a row selected,second textbox populated with grid value,grid gets hidden--> after this process repeated for 2-3 times,again checking on a check box gives the error. Please find the markup with above controls.
<table width="500px">
<tr>
<td>
<fieldset id="fssearch" runat="server">
<legend>Search </legend>
<table>
<tr>
<td>
<asp:CheckBox ID="CBFile" runat="server" Text="File No" OnCheckedChanged="CBFile_CheckedChanged"
AutoPostBack="true" />
</td>
<td>
<asp:CheckBox ID="CBname" runat="server" Text="Patient Name" OnCheckedChanged="CBname_CheckedChanged"
AutoPostBack="true" />
</td>
<td>
<asp:CheckBox ID="CBMobile" runat="server" Text="Mobile No" OnCheckedChanged="CBMobile_CheckedChanged"
AutoPostBack="true" />
</td>
</tr>
<tr>
<td>
<asp:TextBox ID="RTFileS" onkeyup="KeyUp();" runat="server" OnTextChanged="RTFileS_TextChanged" Visible="false"></asp:TextBox>
</td>
<td colspan="2">
<asp:TextBox ID="RTNameS" onkeyup="KeyUp();" runat="server" OnTextChanged="RTNameS_TextChanged" Visible="false"></asp:TextBox>
</td>
<td>
<asp:TextBox ID="RTMobileS" onkeyup="KeyUp();" runat="server" OnTextChanged="RTMobileS_TextChanged" Visible="false"></asp:TextBox>
</td>
</tr>
<tr>
<td colspan="4">
<telerik:RadGrid ID="gvPatientList" runat="server" AllowFilteringByColumn="True"
AllowPaging="True" GridLines="None" OnSelectedIndexChanged="gvPatientList_SelectedIndexChanged" >
<PagerStyle Mode="NextPrevAndNumeric" AlwaysVisible="true" />
<GroupingSettings CaseSensitive="false" />
<ItemStyle HorizontalAlign="Left" />
<HeaderStyle HorizontalAlign="Left" />
<AlternatingItemStyle HorizontalAlign="Left" />
<ClientSettings EnablePostBackOnRowClick="true">
<Selecting AllowRowSelect="true" />
</ClientSettings>
<MasterTableView AutoGenerateColumns="False" DataKeyNames="pt_regid">
<CommandItemTemplate>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</CommandItemTemplate>
<Columns>
<telerik:GridBoundColumn HeaderText="Patient Name" UniqueName="pt_name" DataField="pt_name"
AllowFiltering="false">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn HeaderText="File No" UniqueName="pt_fileno" DataField="pt_fileno"
AllowFiltering="false">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn HeaderText="Mobile" UniqueName="pt_pmobileno" DataField="pt_pmobileno"
AllowFiltering="false">
</telerik:GridBoundColumn>
</Columns>
</MasterTableView>
<HeaderContextMenu EnableImageSprites="True" CssClass="GridContextMenu GridContextMenu_Default">
</HeaderContextMenu>
</telerik:RadGrid>
</td>
</tr>
</table>
</fieldset>
</td>
</tr>
</table>
On selecting a row on the grid,I am populating name column value to a textbox and hiding the grid as below.
protected void gvPatientList_SelectedIndexChanged(object sender, EventArgs e)
{
GridDataItem RegId = gvPatientList.SelectedItems[0] as GridDataItem;
string regid = RegId.GetDataKeyValue("pt_regid").ToString();
foreach (GridDataItem dataItem in gvPatientList.Items)
{
if (dataItem.Selected)
{
RCFName.Text = dataItem["pt_name"].Text;
}
}
gvPatientList.Visible = false;
}
Above mentioned checkboxes act like radio buttons and javascript for the same is as below
<script language="CS" runat="server">
private void makeRadioGroupFromCheckBoxes(IEnumerable<CheckBox> checkBoxes)
{
StringBuilder sb = new StringBuilder();
foreach (CheckBox cb in checkBoxes)
{
foreach (CheckBox innercb in checkBoxes)
{
if (innercb != cb)
{
sb.Append("document.getElementById('");
sb.Append(innercb.ClientID);
sb.Append("').checked = false;");
}
}
cb.Attributes["onclick"] = "if(this.checked){" + sb.ToString() + "}else{this.checked = true;}";
sb = new StringBuilder();
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
this.makeRadioGroupFromCheckBoxes(new CheckBox[] { CBFile, CBname, CBMobile });
}
}
Grid gets populated on textchanged event and 'onkeyup="KeyUp();' function of the textbox,associated with it as below. aspx:
<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
<script type="text/javascript">
var timer = null;
function KeyUp() {
if (timer != null) {
clearTimeout(timer);
}
timer = setTimeout(LoadTable, 500);
}
function LoadTable() {
$find("<%= RadAjaxManager1.ClientID %>").ajaxRequest("FilterGrid");
}
</script>
</telerik:RadCodeBlock>
code behind:
protected void RadAjaxManager1_AjaxRequest(object sender, Telerik.Web.UI.AjaxRequestEventArgs e)
{
if (e.Argument.IndexOf("FilterGrid") != -1)
{
gvPatientList.Rebind();
}
}
protected void RTFileS_TextChanged(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(RTFileS.Text))
{
_scheduleService = new ScheduleService();
clsSchedule clsschedule = new clsSchedule();
string search = " where OldRegnNo like '" + RTFileS.Text + "%" + "'";
gvPatientList.DataSource = _scheduleService.GetAllPatients(search);
gvPatientList.Rebind();
}
}
On checkedchanged eveent of check boxes,I am making the grid visible.
protected void CBFile_CheckedChanged(object sender, EventArgs e)
{
if (CBFile.Checked)
{
RTFileS.Visible = true;
gvPatientList.Visible = true;
gvPatientList.MasterTableView.Visible = true;
gvPatientList.Rebind();
}
else
{
RTFileS.Visible = false;
}
}
Ajaxmanager is as below:
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" OnAjaxRequest="RadAjaxManager1_AjaxRequest">
<AjaxSettings>
<telerik:AjaxSetting AjaxControlID="gvPatientList">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="gvPatientList" LoadingPanelID="RadAjaxLoadingPanel1" />
<telerik:AjaxUpdatedControl ControlID="RCFName" />
</UpdatedControls>
</telerik:AjaxSetting>
<telerik:AjaxSetting AjaxControlID="RadAjaxManager1">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="gvPatientList" LoadingPanelID="RadAjaxLoadingPanel1" />
</UpdatedControls>
</telerik:AjaxSetting>
I hope hiding/unhiding the grid gives me the error.Please suggest your ideas on this. Thanks, Soumya
