[patch][cla]Big lists and dojox.form.DropDownSelect

[Eugene Lazutkin]

When the list of values does not fit directly above or below the button, it overlaps with it and is positioned under the mouse cursor. The list appears when user clicks the button. When the overlap happens, the last part of the click (onmouseup) is being interpreted by the list as a selection. User clicks the widget, the list flickers momentarily, and seemingly random item gets selected, without presenting the choice, or so it seems to the user.

[Eugene Lazutkin]

There are several possible solutions (discussed with toonetown):

• Process onclick on the list rather than onmouseup.
• Watch for onmousedown event making sure that the list gets it before onmouseup. If not, disregard onmouseup.
• Scroll choices rather than allowing overlapping (can be a problem in tight spaces?).

Or any of the above can be done only when we know that there is the overlap. We know that because we position the list around the button.

[Eugene Lazutkin]

Scrolling is clearly preferable for really long lists.

[Phil DeJarnett]

I'd like to second that this (scrolling) needs to be added.

FilteringSelect? is not a very good replacement for normal select boxes (it's confusing, looks too much like a ComboBox?, and doesn't provide the ability to have disabled items).

Even a short list that happens to be just long enough to hang off the bottom of the page doesn't work.

[Nathan Toone]

This patch prevents the execution from firing if your mouse is still over the clickable button - basically indicating that the menu has overlapped

[Nathan Toone]

Patch which implements a "maxHeight" and "maxWidth" on dropdown selects - this patch also includes the previous patch.

[Nathan Toone]

Fixed in trunk in [17156] - changing milestone for consideration for inclusion in branch.