Livebindings Expressions for 2 TComboboxes parent to child relationship using ClientDataSets in RAD Studio

Question

I am trying to connect the parent TCombobox to child TCombobox using the Livebindings in RAD Studio. Meaning, when I select a customer in the parent Tcombobox, the child Tcombobox will generate the jobs under the parent only.

I have tried some binding expressions as you can see in the screenshots below but no avail. I also included below my tables screenshots.

What I want to achieve is to limit the list of jobs with customer-related jobs only. The screenshot below highlighted in blue should be the ones in the dropdown only.

Any help would be greatly appreciated.

Answer 1

I want to conclude this question by answering my own question. I wouldn't get the answer if not for some nice people here willing enough to share quick help. Here's what I got:

I used the ClientDataSet Filtering here. First, I initialized the key field of my clientdatasetJob then set the range of filter by the value selected in the combobox.

 cdsJob.IndexFieldNames := 'CustomerName';
 cdsJob.SetRange([cmbCustomer.Text],[cmbCustomer.Text]);

You might wonder why same values given in the set range. Basically, I don't need the range but a single value only. I added as well the field CustomerName in the clientdatasetJob for my key field.