279108 - in a listbox onselect is called after a call to clearselection()

Status: RESOLVED EXPIRED

(Core :: XUL, defect)

Description

[marja]

User-Agent:       Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20050105 

listbox onselect is called even when nothing is selected

for example:
when I clear the selection in the onselect callback function with 
clearSelection() the callback function handletopicItemSelection() gets called

case:

<listbox id = "topicresultList"
   flex = "1"
    datasources = "rdf:null"
    ref = "urn:myroot"
    observes = "bc_displayResults"
    onselect = "handletopicItemSelection();event.preventBubble();">
    ...
</listbox>

function handletopicItemSelection() {
/**
 *  Shows the selected topic.
 */

   var
      listbox = document.getElementById("topicresultList"),
      item = listbox.selectedItem;

   dump("  item: "+item+"\n");

   /* return if nothing is selected from listbox -
       not sure why this is even called in that case ...  */
    if (item == null) {
      dump("  why is this called????\n");
      return;
    }

    var
      uri = item.getAttribute("resourceuri");

    if (uri) {
      listbox.clearSelection();
      dump("  after clear selection calls this function 
again\n");
      showTopic(uri);
      dump("  after show topic\n");
      return;
    }
}

Reproducible: Always

Steps to Reproduce:
1. select listbox item (opens topic window)
2. close topic window 
3. select same listbox item again (open the closed topic window again)

Actual Results:  
after selecting the listbox item on step 1 and step 3 the onselect function is 
called twice after each step, not once

Expected Results:  
only call the onselect function when an item is selected from the listbox

I also wanted to be able to select the same item again even if it was already 
select (selection opens a windows and if it is closed the user may want to 
open the same window again). So either I need to get the selection even if the 
same item was already selected on clear the selection myself as I'm doing now.

Comment 1

[Gervase Markham [:gerv]]

This is an automated message, with ID "auto-resolve01".

This bug has had no comments for a long time. Statistically, we have found that
bug reports that have not been confirmed by a second user after three months are
highly unlikely to be the source of a fix to the code.

While your input is very important to us, our resources are limited and so we
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Comment 2

[Gervase Markham [:gerv]]

This bug has been automatically resolved after a period of inactivity (see above
comment). If anyone thinks this is incorrect, they should feel free to reopen it.