Implement a DataCell template and EditCell template on the same Grid column WITHOUT a server template

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esqmo Posted: Wed Aug 12, 2009 @ 9:26 AM
Basically I want to do this
Q10122 - HOWTO: Implement a DataCell template and EditCell template on the same Grid column

but without using a GridServerTemplate because its really slow and I dont actually need anything from the server. Bascially I want a column in my Grid to be text normally but when you edit it the text becomes a combo box. But I dont want to waste time talking to the server just to get a combo box im going to fill client side anyway.

So far ive been using a ClientTemplate

   <ComponentArt:ClientTemplate ID="ComboBox1_Template">
       ## mytest(DataItem) ##

this almost works but when the user stops editing the 'editing' text stays.

I keep feeling like there could be a better way to do this! Is there an easy way to get combo boxes to appear (remember im filling the entire table client side!)

Thanks very much for your help!
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esqmo Posted: Thu Aug 13, 2009 @ 2:19 AM
All I really need is a way to find which row (if any) is currently being edited. Is there any Client-side way of doing this?
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esqmo Posted: Thu Aug 13, 2009 @ 4:00 AM
Right ive solved it. I copied the \live_demos\demos_control-specific\grid\features\editing_dataClientMode\ code and changed it to

  <ComponentArt:GridColumn DataField="DEPJobID" AllowSorting="true" HeadingText="DEP Job ID" DefaultSortDirection="Descending" Align="Left" Width="70" ForeignTable="DDLTable" ForeignDataKeyField="ID" ForeignDisplayField="Value"/>

The ForeignTable,ForeignDataKeyField and ForeignDisplayField get the dropDownList content from a table specified server side.

And created an empty table on the server with the following code

DataTable DDLTable = new DataTable("DDLTable");

DataSet dsSrc = new DataSet();

Grid1.DataSource = dsSrc;

This all works and without causing a postback.
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hwan Posted: Thu Aug 13, 2009 @ 9:25 AM
Thanks for posting your solution.

However, I'm pretty sure that EditCell server templates do not require a postback to be used, if that was the original issue you faced.
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esqmo Posted: Fri Aug 14, 2009 @ 3:47 AM
Well when I use the ServerTemplate the grid pauses for about 2 seconds and then refreshes itself, then Load event is called. This looks like a Postback, is there anyway to get rid of the pause/refresh?
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hwan Posted: Wed Aug 19, 2009 @ 3:47 PM
If you're still interested in using the EditCell server template approach, post the code you were using. It sounds like the client template or CustomEditSetExpression is very slow/resource intensive.
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esqmo Posted: Thu Aug 20, 2009 @ 4:12 AM

In the end I went for using only the ClientTemplates. I used the edit templates that come with some of the demo apps and set EditOnClickSelectedItem="false" so that I could get the currently edited row (a property that would be nice to add to the Grid) like so

  <a href="#" onclick="return edit_onclick('## DataItem.get_index() ##');">Edit</a>
  | <a href="#" onclick="return delete_onclick('## DataItem.get_index() ##');">Delete</a>
<ComponentArt:ClientTemplate ID="EditCommandTemplate">
  <a href="#" onclick="update_onclick('## DataItem.get_index() ##')">Update</a> |
  <a href="#" onclick="iEditRow = -1; GrdJobsOnDPM.editCancel();">Cancel</a>
<ComponentArt:ClientTemplate ID="InsertCommandTemplate">
  <a href="#" onclick="iEditRow = -1; GrdJobsOnDPM.editComplete();">Insert</a> |
  <a href="#" onclick="iEditRow = -1; GrdJobsOnDPM.editCancel();GrdJobsOnDPM.Page(0);">Cancel</a>
function edit_onclick(index) {
  iEditRow = index;

function delete_onclick(index) {
  if (confirm("Are you sure you want to permanently delete " + arr_File_Info[index].getName() + "?")) {
    //no row being edited any more
    iEditRow = -1;

Now iEdit row is the currently edited row!

Now I have a rather lengthy combo box template which allows me to have full control over the properties of the combo box inside!

<ComponentArt:ClientTemplate ID="DictatorDDLTemplate">
  ## ddlTemplate("Dictator", DataItem, GrdJobsOnDPM_columns.Access, arrAccessCode) ##
<ComponentArt:ClientTemplate ID="CompanyDDLTemplate">
  ## ddlTemplate("Company", DataItem, GrdJobsOnDPM_columns.Company, arrCompanyID) ##
<ComponentArt:ClientTemplate ID="WorkTypeDDLTemplate">
  ## ddlTemplate("WorkType", DataItem, GrdJobsOnDPM_columns.WorkType, arrWorkType) ##
function ddlTemplate(ddlID, DataItem, column, ddlList) {
  var curValue = DataItem.getMemberAt(column).get_value();
  var curRow = DataItem.get_index(); 

  if (curRow == iEditRow) {
    var id = getId(curValue);
    //if this is the row currently being
    //edited then put a combo box here
    var retStr = '<select id="ddl' + ddlID + '" class="ddlInput" ' +
      'style="width: ' + (tblJobsOnDPM.get_columns()[column].get_width() - 3) + 'px" ' + '>\n';

    //add the options
    var bAddedSelectedOption = false;
    for (var i = 0; i < ddlList.length; i++) {

      retStr = retStr + '<option id="' + ddlList[i].id + '"';
      //select the correct option
      if (id == ddlList[i].id) {
        bAddedSelectedOption = true;
        retStr = retStr + ' selected="selected"';
        retStr = retStr + '>' + ddlList[i].toString() + '</option>\n';
    //if the current item isn't in the list then add it
    if (!bAddedSelectedOption) {
      retStr = retStr + '<option id=' + id + ' selected="selected">' + curValue + '</option>\n';
    return retStr + '</select>\n';
  } else {
    //this row is not being edited so just display its value
    return curValue;
function update_onclick(index) {
  iEditRow = -1;
  var curRow = tblJobsOnDPM.getRow(index);

  var ddlDictator = $get("ddlDictator");
  var ddlCompany = $get("ddlCompany");
  var ddlWorkType = $get("ddlWorkType");


  curRow.setValue(GrdJobsOnDPM_columns.Access, ddlDictator[ddlDictator.selectedIndex].value);
  curRow.setValue(GrdJobsOnDPM_columns.Company, ddlCompany[ddlCompany.selectedIndex].value);
  curRow.setValue(GrdJobsOnDPM_columns.WorkType, ddlWorkType[ddlWorkType.selectedIndex].value);
This all works very quickly and allows me to apply my own style to the combo boxes. The previous method didnt select the current selected option automatically, this does.

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Posts: 6,463
hwan Posted: Tue Aug 25, 2009 @ 12:29 PM
This is quite nice! Thanks for posting it.

p.s. You can use Grid's undocumented EditingId to get the clientId of the currently edited row.
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