[4.2.0 RC] Expanding a tree node causes multiple layouts

**Daniil** · 7 Mar 2013 5:34 AM

REQUIRED INFORMATION

Ext version tested:

Ext 4.2.0 RC

Browser versions tested against:

IE9
Chrome

DOCTYPE tested against:

<!DOCTYPE html>

Description:

Expanding a tree node causes multiple layouts. Expanding a node with children causes two layouts. Expanding a non-leaf node without children causes four layouts. It seems too many and possibly can cause performance issues.

Steps to reproduce the problem:

Expand nodes

The result that was expected:

A single layout

The result that occurs instead:

Two or four layouts

Test Case:

Code:

<!DOCTYPE html>
<html>
<head>
    <title>Expanding a node causes multiple layouts</title>

    <link rel="stylesheet" href="../resources/css/ext-all.css" />

    <script src="../ext-all-debug.js"></script>

    <script>
        Ext.onReady(function () {
            var children = [];
            for (var i = 0; i < 50; i++) {
                children.push({
                    text: "SubNode" + i
                });
            }
            var tree = Ext.create("Ext.tree.Panel", {
                renderTo: Ext.getBody(),
                height: 450,
                width: 300,
                root: {
                    text: "Root",
                    children: children
                },
                listeners: {
                    afterlayout: {
                        fn: function () {
                            console.log('layout');
                        }
                    }
                }
            });
        });
    </script>
</head>
<body>
</body>
</html>

**mankz** · 7 Mar 2013 3:06 PM

We've seen this for a while too, hacking past it using this override:

Code:

this.override({
                expand : function () {
                    Ext.suspendLayouts();
                    this.callParent(arguments);
                    Ext.resumeLayouts();
                }
            });

**Animal** · 8 Mar 2013 9:20 AM

Thanks for the report! I have opened a bug in our bug tracker..... for the 4.2.1 release

[4.2.0 RC] Expanding a tree node causes multiple layouts

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[4.2.0 RC] Expanding a tree node causes multiple layouts

[4.2.0 RC] Expanding a tree node causes multiple layouts