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From "Judah Frangipane (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLEX-35019) Tree Error in updateDropData
Date Fri, 29 Jan 2016 09:00:47 GMT

     [ https://issues.apache.org/jira/browse/FLEX-35019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Judah Frangipane updated FLEX-35019:
------------------------------------
    Description: 
When dragging and dropping, a 

{code}"Type Error #1010 A term is undefined and has no properties" {code} occurs sometimes
when dragging over multiple rows. 

It may only happen with the NativeDragManager or may not. I haven't pinned it down. I've attached
screen shots. 

It happens on Line 2782 in mx.controls.Tree: 
{code:actionscript}
var topItem:Object = (rowNum > _verticalScrollPosition && rowNum <= numItems)
? 
        					 listItems[rowNum - _verticalScrollPosition - 1][0].data : null;
{code}
The item at this index contains no items (see screenshot): 
{code:actionscript}
listItems[rowNum - _verticalScrollPosition - 1]
{code} 

The solution may be to check if the array has a length: 
{code:actionscript}
if ((rowNum > _verticalScrollPosition && rowNum <= numItems) && 
        listItems[rowNum - _verticalScrollPosition - 1].length ) {
    var topItem:Object = listItems[rowNum - _verticalScrollPosition - 1][0].data;
}
{code}
but that may only prevent the error and not be the root of the problem. 

Note: It looks like the next line doesn't test if the array has data either:
{code:actionscript}
var bottomItem:Object = (rowNum - verticalScrollPosition < rowInfo.length && rowNum
< numItems) ? 
        						listItems[rowNum - _verticalScrollPosition][0].data  : null;
{code}

  was:
When dragging and dropping, a 

{code}"Type Error #1010 A term is undefined and has no properties" {code} occurs sometimes
when dragging over multiple rows. 

It may only happen with the NativeDragManager or may not. I haven't pinned it down. I've attached
screen shots. 

It happens on Line 2782 in mx.controls.Tree: 
{code:actionscript}
var topItem:Object = (rowNum > _verticalScrollPosition && rowNum <= numItems)
? 
        					 listItems[rowNum - _verticalScrollPosition - 1][0].data : null;
{code}
This item: 

{code:actionscript}
listItems[rowNum - _verticalScrollPosition - 1]
{code}
contains no items. 

The solution may be to check if the array has a length: 

{code:actionscript}
if ((rowNum > _verticalScrollPosition && rowNum <= numItems) && 
        listItems[rowNum - _verticalScrollPosition - 1].length ) {
    var topItem:Object = listItems[rowNum - _verticalScrollPosition - 1][0].data;
}
{code}
but that may only prevent the error and not be the root of the problem. 

Note: It looks like the next line doesn't test if the array has data either:

{code:actionscript}
var bottomItem:Object = (rowNum - verticalScrollPosition < rowInfo.length && rowNum
< numItems) ? 
        						listItems[rowNum - _verticalScrollPosition][0].data  : null;
{code}


> Tree Error in updateDropData
> ----------------------------
>
>                 Key: FLEX-35019
>                 URL: https://issues.apache.org/jira/browse/FLEX-35019
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Spark: Tree
>    Affects Versions: Apache Flex 4.15.0
>            Reporter: Judah Frangipane
>         Attachments: Screen Shot 2016-01-22 at 4.19.23 PM.png, Screen Shot 2016-01-22
at 4.19.58 PM.png, Screen Shot 2016-01-22 at 4.21.59 PM.png
>
>
> When dragging and dropping, a 
> {code}"Type Error #1010 A term is undefined and has no properties" {code} occurs sometimes
when dragging over multiple rows. 
> It may only happen with the NativeDragManager or may not. I haven't pinned it down. I've
attached screen shots. 
> It happens on Line 2782 in mx.controls.Tree: 
> {code:actionscript}
> var topItem:Object = (rowNum > _verticalScrollPosition && rowNum <= numItems)
? 
>         					 listItems[rowNum - _verticalScrollPosition - 1][0].data : null;
> {code}
> The item at this index contains no items (see screenshot): 
> {code:actionscript}
> listItems[rowNum - _verticalScrollPosition - 1]
> {code} 
> The solution may be to check if the array has a length: 
> {code:actionscript}
> if ((rowNum > _verticalScrollPosition && rowNum <= numItems) &&

>         listItems[rowNum - _verticalScrollPosition - 1].length ) {
>     var topItem:Object = listItems[rowNum - _verticalScrollPosition - 1][0].data;
> }
> {code}
> but that may only prevent the error and not be the root of the problem. 
> Note: It looks like the next line doesn't test if the array has data either:
> {code:actionscript}
> var bottomItem:Object = (rowNum - verticalScrollPosition < rowInfo.length &&
rowNum < numItems) ? 
>         						listItems[rowNum - _verticalScrollPosition][0].data  : null;
> {code}



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