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Tree component onSelect performs load on demand (onOpen event)

asked 2015-07-28 18:20:46 +0800

michaelh gravatar image michaelh
27 1

I have created an interface using the Tree component. The tree lists the items from the database (3 data types). This tree component uses the load-on-demand features where the node class method, getChild() or getChildCount() performs the load from the database. Typically these methods are called during the onOpen event when the user clicks on the arrow to expand the node. This is working just fine. My problem is I also have an onSelect event that I listen to in the view model. On selection it is to change the view on the web page based on the node type selected. I am seeing that the onOpen event is also getting trigger during the onSelect event. I don't believe that this should be happening when selecting a treeitem. This causes performance issues when a user merely selects a tree item due to large amounts of data. How can I prevent the onOpen event from triggering during the onSelect event? I'm using ZK 7.0.5.FL.20150323.

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I can't reproduce this issue, check the zkfiddle sample. If your use case is different from mine, please provide your sample.

vincentjian ( 2015-07-29 04:30:56 +0800 )edit

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answered 2018-09-27 15:23:19 +0800

Ignis11 gravatar image Ignis11
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I work on ZK 8.5.0. CE And I suffer the same issue.

I implemented AbstractTreeModel, and when I try to select a node on the tree, the model will try to load again.

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A common issue when extending AbstractTreeModel is to forget implementing a specialized getPath method. https://www.zkoss.org/wiki/ZKDeveloper'sReference/MVC/Model/TreeModel#OpenTree_Nodes

The default implementation performs a depth-first-inside the model - which can lead to a full reload.

cor3000 ( 2018-09-28 14:25:45 +0800 )edit
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Asked: 2015-07-28 18:20:46 +0800

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Last updated: Sep 27

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