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null grid in javascript function

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Grid

This is a migrated thread and some comments may be shown as answers.

Elliott asked on 06 Jun 2011, 09:33 PM

I can't seem to get to the grid in a function
the function throws a null object error

<telerik:RadGrid ID="rgEditOrder" OnNeedDataSource="rgEditOrder_NeedDataSource" OnItemCommand="rgEditOrder_ItemCommand" OnItemUpdated="rgEditOrder_UpdateRow" OnItemCreated="rgEditOrder_OnItemCreated" runat="server">

<GroupingSettings CaseSensitive="false" />

<MasterTableView DataKeyNames="OrderSeq" AutoGenerateColumns="false" AllowSorting="true" AllowPaging="true" AllowFilteringByColumn="False" EditMode="InPlace" >

<Columns>

<telerik:GridBoundColumn UniqueName="StoreNumber" DataField="StoreNumber" HeaderText="Store #" DataFormatString="{0:#####}" DataType="System.Int32" ReadOnly="True">

<HeaderStyle Width="40px" />

</telerik:GridBoundColumn>

a bunch of columns

<telerik:GridTemplateColumn UniqueName="Qty" HeaderText="Cases" >

<ItemTemplate>

<asp:Label ID="lblQty" Text='<%# Bind("Qty") %>' Width="40px" runat="server" />

</ItemTemplate>

<EditItemTemplate>

<telerik:RadNumericTextBox ID="rntbQty" Text='<%# Eval("Qty") %>' MinValue='<%# Bind("Qty") %>' Width="40px" runat="server">

<NumberFormat DecimalDigits="0" />

</telerik:RadNumericTextBox>

</EditItemTemplate>

<HeaderStyle Width="40px" />

</telerik:GridTemplateColumn>

more columns

<telerik:GridBoundColumn UniqueName="OrderSeq" DataField="OrderSeq" DataType="System.Int64" Visible="false">

</telerik:GridBoundColumn>

</Columns>

</MasterTableView>

<ClientSettings EnablePostBackOnRowClick="true" >

<ClientEvents OnRowDblClick="RowDblClick" />

</ClientSettings>

</telerik:RadGrid>

<html xmlns="http://www.w3.org/1999/xhtml" >

<head id="Head1" runat="server">

<title>Edit Order</title>

<script language="javascript" type="text/javascript">

<!--

// this function handles the onbeforeprint event of the body object

function window_onbeforeprint()

{

// idprint is the id assigned to the div tag of the javascript

// injected into the response object in the code behind which

// actually prints the screen

var divEle = document.getElementById("idPrint");

// remove the display=none i.e. show the div element

if (divEle != null)

{

divEle.style.display = "";

}

// hide the div elements

idShow.style.display="none";

// idShow.style.display="none";

// idShow1.style.display="none";

idShow1.style.display="none";

idHeader.style.display="none";

}

// this function handles the onafterprint event of the body object

function window_onafterprint()

{

// idprint is the id assigned to the div tag of the javascript

// injected into the response object in the code behind which

// actually prints the screen

var divEle = document.getElementById("idPrint");

// hide the div element

if (divEle != null)

{

divEle.style.display = "none";

}

// remove the style.display='none'-show the div element

idShow.style.display="";

// idShow1.style.display="";

idShow1.style.display="";

idHeader.style.display="";

}

var idx = 0;

function RowDblClick(sender, eventArgs) {

idx = eventArgs.get_itemIndexHierarchical();

sender.get_masterTableView().editItem(idx);

}

// this function is called on the click event of the Finalize Order button

// it is wired to the button in the page load event

function check_input() {

// both the first and last name need to be entered-if either of them is not

// popup message box and cancel update

var strName = document.getElementById('txtFirstName');

if (trim(strName.value) == "") {

alert("Please Enter First Name");

return (false);

}

strName = document.getElementById('txtLastName');

if (trim(strName.value) == "") {

alert("Please Enter Last Name");

return (false);

}

return (true);

}

// use regular expression to format first or last name

// per Derek-remove any imbedded white space

function trim(str) {

return str.replace(/^\s+|\s+$/g, '');

}

// this functiom was added because the code behind is looking for it

function PrintPage() {

return true;

}

-->

</script>

</head>

protected void rgEditOrder_OnItemCreated(object source, GridItemEventArgs e)

{

StringBuilder sb;

GridEditableItem geItem;

TableCell tcQty;

RadNumericTextBox rntbQty;

char DoubleQuote;

string EscapeChar,str;

DoubleQuote = (char) 34;

sb = new StringBuilder(DoubleQuote);

EscapeChar = sb.ToString();

str = DoubleQuote.ToString();

if (e.Item.IsInEditMode)

{ }

else

return;

if (e.Item is GridEditableItem)

{ }

else

return;

geItem = (GridEditableItem)(e.Item);

sb = new StringBuilder("<script language=");

sb.Append(@"'");

sb.Append("javascript");

sb.Append(@"'");

sb.Append(" ");

sb.Append(@"'");

sb.Append("text/javascript");

sb.Append(@"'");

sb.Append(">");

sb.Append("function QtyOnValueChanged(sender, eventArgs) { ");

sb.Append("alert(");

sb.Append(@"'");

sb.Append("gorkomatic");

sb.Append(@"'");

sb.Append("); ");

sb.Append("var grid = $find(");

sb.Append(@"'");

sb.Append("<%= ");

sb.Append("rgEditOrder.ClientID");

sb.Append(" %>");

sb.Append(@"'");

sb.Append(").get_masterTableView(); ");

sb.Append("grid.updateItem(grid.get_dataItems()[");

sb.Append(geItem.DataSetIndex.ToString());

sb.Append("].get_element()); ");

sb.Append("alert(");

sb.Append(@"'");

sb.Append("qty on value changed");

sb.Append(@"'");

sb.Append("); }");

sb.Append("</script>");

str = sb.ToString();

rcBlock.Controls.Add(new LiteralControl(str));

// ScriptManager.RegisterStartupScript(this,this.GetType(), "Update", str, false);

tcQty = geItem.Cells[1];

rntbQty = (RadNumericTextBox)tcQty.FindControl("rntbQty");

if (rntbQty == null)

return;

rntbQty.ClientEvents.OnValueChanged = "QtyOnValueChanged";

}

1 Answer, 1 is accepted

answered on 07 Jun 2011, 10:00 AM

Hello Marianne,

You cannot add a code expression to the page programmatically as you do with the StringBuilder:

sb.Append("var grid = $find(");

sb.Append(@"'");

sb.Append("<%= ");

sb.Append("rgEditOrder.ClientID");

sb.Append(" %>");

sb.Append(@"'");

Instead, you can directly output the ClientID of the control:

sb.Append("var grid = $find(");

sb.Append(@"'");

sb.Append(rgEditOrder.ClientID);

sb.Append(@"'");

Veli
the Telerik team

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