Closed Bug 89425 Opened 23 years ago Closed 23 years ago

javascript select on multiple select box is malfunctioning

Categories

(Core :: DOM: Core & HTML, defect)

Product:
Core
Component:
DOM: Core & HTML
Platform:
x86
All
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Status:
RESOLVED WORKSFORME

People

(Reporter: mozbugs, Assigned: jst)

References

(
URL
)

Details

Attachments

(1 file)

Reduced testcase
639 bytes, text/html
Details 
Recently javascripted form.select[val].selected = true; calls are getting wiped
away in 9.2.

See for yourself: http://www.aocsolutions.com/show_moz_select_error.html
Here is a synopsis of the HTML:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>
<head>
 <title>Untitled</title>
</head>

<body>

<form name="f" id="f">
  <select name="s" id="s" multiple="multiple">
      <option>0</option>
  </select>

  <input type="button" 
         value="try it" 
         onclick="document.f.s.length += 1; 
                  document.f.s[document.f.s.length-1].text = 'select me'; 
                  document.f.s[document.f.s.length-1].selected = true; 

                  for (var c=document.f.s.length-1; c >-1;c--) 
                    alert (c + ' is selected ? ' +  document.f.s[c].selected); 

                  for (var c=document.f.s.length-1; c >-1;c--) 
                    alert (c + ' is selected ? ' +  document.f.s[c].selected);" 
  />

</form>
</body>
</html>

Reduced testcase: 


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>
<head>
 <title>Bug 89425</title>
</head>

<body>

<form name="f" id="f">
  <select name="s" id="s" multiple="multiple">
      <option>Option 0</option>
      <option>Option 1</option>
      <option>Option 2</option>
  </select>

  <input type="button" 
         value="try it" 
         onclick="document.f.s.length += 1; 
                  var len = document.f.s.length;
                  document.f.s[len - 1].text = 'Option ' + (len -1);
                  document.f.s[0].selected = true;" />

</form>
</body>
</html>
Status: UNCONFIRMED → NEW
Ever confirmed: true
Attached file Reduced testcase — 

    
    

    
  
The reduced testcase is trying to select the topmost option in the 
selectbox. This works in NN4.7, but not in Mozilla 20010628xx.


If we remove these three lines of code: 

                  document.f.s.length += 1; 
                  var len = document.f.s.length;
                  document.f.s[len - 1].text = 'Option ' + (len -1);


Then the selection of the topmost option works just fine: 

                  document.f.s[0].selected = true;


Somehow the first three lines are preventing the fourth line from working.
Reassigning to DOM Level 0 for further analysis - 

Component: Javascript Engine → DOM Level 0
OS: Windows NT → All

    
    

    
  
Really reassigning -
Assignee: rogerl → jst
QA Contact: pschwartau → desale

    
    

    
  
again the same bug about selected = true, probably a dup of bug 86659

    
    

    
  
This is WFM on 0.9.4 and 2001092113 Linux.  The first option gets selected after
the last option is added.
Status: NEW → RESOLVED
Closed: 23 years ago
Resolution: --- → WORKSFORME

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