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Disable Combobox after empty dataquery

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ComboBox
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Christian
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Christian asked on 16 Aug 2014, 11:54 AM
Hi there,

I have 2 cascading comboboxes in my form: CompanyId --> TaskId

When I select a company and there are no tasks linked to it the TaskId combobox should become disabled.
Just like it becomes disabled when I clear the CompanyId combobox.

This is what I do in the controller action:
       
01.public JsonResult Autocomplete(string query, int companyId) {
02.           var ret = Dao.Task.GetMany(i => i.CompanyId == companyId);
03. 
04.           if (!string.IsNullOrEmpty(query)) {
05.               query = query.ToLower();
06.               ret = ret.Where(i => i.Subject.ToLower().Contains(query));
07.           }
08. 
09.           var res = ret.Select(i => new {
10.               id = i.Id,
11.               name = i.Subject
12.           });
13. 
14.           return Json(res, JsonRequestBehavior.AllowGet);
15. 
16.       }


How can I do that?

many thanks,
Chris

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Georgi Krustev
Telerik team
answered on 18 Aug 2014, 04:18 PM
Hello Chris,

I would suggest you wire the dataBound event of the widget using DataBound fluent method. Then in the dataBound event handler you can disable the widget if the data source component is empty:
function dataBound(e) {
    var widget = e.sender;
 
    if (widget.dataSource.view().length === 0) {
        widget.enable(false);
    }
}

Regards,
Georgi Krustev
Telerik
 
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Ingerid
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answered on 16 Sep 2020, 08:19 AM

Hello,

I know this question is a really long one, but I'm having the same problem, and your solution doesn't work properly. It does indeed disable the combobox when no data is found, but it also disables it when I cross out the selected option. Do you have a suggestion for how I can fix this?

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Martin
Telerik team
answered on 18 Sep 2020, 07:02 AM

Hello Ingerid,

Could you please share a Dojo example where I can observe the issue you are experiencing? I will test it and find an appropriate solution.

Looking forward to your reply.

Regards,
Martin
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Ingerid
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answered on 21 Sep 2020, 12:09 PM
Thanks, but I figured it out. I thought the databound event was called immediately after data was loaded, but it seems like the data is filtered first. In my code, filtering would trigger a call to a function that would reset the datasource, so no wonder it didn't work for me. Weirdly enough, I couldn't find a way to get the datasource before filtering, but I worked my way around it.
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Christian
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Georgi Krustev
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Ingerid
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Martin
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