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Re: Long delay when using JComboBox.setSelectedIndex() ??

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On 12/5/2012 9:27 AM, kedward777@gmail.com wrote:
> Hello,
>
> I am attempting to load 5000 employee items into a jcombobox, and then setSelectedIndex, but I am getting a odd delay in the gui after setting the selectedIndex
>
> 1) If I load the 5000 employee names using a simple vector, it works fine. When I call setSelectedIndex(5), it sets the combobox to the 5th element, very quickly. This works fine:
>
>   while ((line = input.readLine()) != null) {
>                  StringTokenizer st = new StringTokenizer(line, "|");
>                  lastName = st.nextToken().trim();
>                  firstName = st.nextToken().trim();
>                  id = Integer.parseInt(st.nextToken().trim());
>                   comboBoxItems.add(lastName);}
>
>                  mybox1.setModel(new javax.swing.DefaultComboBoxModel(model));
>                  mybox1.setSelectedIndex(5);
>
>
> 2)HOWEVER, if I load an employee object into a mapped vector, and then setSelectedIndex(5), I DO see it instantly set the GUI combobox to the 5th item, BUT then there is a LOOOONG delay in the gui (1 minute or more) before it allows me to do anything further in the gui
>
>   while ((line = input.readLine()) != null) {
>                  StringTokenizer st = new StringTokenizer(line, "|");
>                  lastName = st.nextToken().trim();
>                  firstName = st.nextToken().trim();
>                  id = Integer.parseInt(st.nextToken().trim());
>                  empBuffer=  new Employee(id, lastName );
>                  map.put(empBuffer.getId()+"",empBuffer );
>                  count++; }
>
>               model.addAll(map.values());
>               Collections.sort(model);
>               mybox1.setModel(new javax.swing.DefaultComboBoxModel(model));
>               mybox1.setSelectedIndex(5);
>
>
> public class Employee implements Comparable {
>           private int id;
>           private String name;
>
>           public Employee(int id, String name) {
>               this.id = id;
>               this.name = name;
>           }
>
>           public String getName() {
>               return name;
>           }
>
>           public int getId() {
>               return id;
>           }
>
>           public int compareTo(Object emp) {
>               return getName().compareTo(((Employee)emp).getName());
>           }
>
>           public String toString() {
>               return getName()+","+getId();
>           }
>       }
>

Having created some rather large GUIs that perform poorly, I wouldn't 
create a JComboBox with 5000 elements.  It is just too many especially 
if your computer is not really fast.

Suggestion:  Keep your Employee objects in a List of some sort and use 
an editable JComboBox that will load names or IDs that match what you 
enter.  I might wait for two or three letters before stuffing the 
JComboBox to keep the list a more reasonable size.  If a person entered 
a number you could just bring up that Employee.

-- 

Knute Johnson

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Long delay when using JComboBox.setSelectedIndex() ?? kedward777@gmail.com - 2012-12-05 09:27 -0800
  Re: Long delay when using JComboBox.setSelectedIndex() ?? kedward777@gmail.com - 2012-12-05 10:08 -0800
    Re: Long delay when using JComboBox.setSelectedIndex() ?? Lew <lewbloch@gmail.com> - 2012-12-05 10:35 -0800
      Re: Long delay when using JComboBox.setSelectedIndex() ?? kedward777@gmail.com - 2012-12-05 10:46 -0800
        Re: Long delay when using JComboBox.setSelectedIndex() ?? Lew <lewbloch@gmail.com> - 2012-12-05 11:31 -0800
        Re: Long delay when using JComboBox.setSelectedIndex() ?? Roedy Green <see_website@mindprod.com.invalid> - 2012-12-05 16:16 -0800
          Re: Long delay when using JComboBox.setSelectedIndex() ?? Lew <lewbloch@gmail.com> - 2012-12-05 16:34 -0800
            Re: Long delay when using JComboBox.setSelectedIndex() ?? Knute Johnson <nospam@knutejohnson.com> - 2012-12-05 16:40 -0800
              Re: Long delay when using JComboBox.setSelectedIndex() ?? Lew <lewbloch@gmail.com> - 2012-12-05 16:58 -0800
            Re: Long delay when using JComboBox.setSelectedIndex() ?? Roedy Green <see_website@mindprod.com.invalid> - 2012-12-06 15:32 -0800
              Re: Long delay when using JComboBox.setSelectedIndex() ?? Lew <lewbloch@gmail.com> - 2012-12-06 18:04 -0800
  Re: Long delay when using JComboBox.setSelectedIndex() ?? Knute Johnson <nospam@knutejohnson.com> - 2012-12-05 16:15 -0800
  Re: Long delay when using JComboBox.setSelectedIndex() ?? Gene Wirchenko <genew@telus.net> - 2012-12-12 18:15 -0800

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