Problem with treeview control's postback
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Hi All, I'm facing a problem with the page postback. Its like....I have a treeview control whose first three levels are populating on page load. The next levels are being populated on “treeview_treenodeexpanded” event ,based on certain criteria .But each time we expand it the page gets posted back, as it is the case. I want the postback to be blocked somehow and the tree nodes need to be populated on expand event only. Is AJAX a solution for this? If so, how to implement this?:confused: I hope someone can help me out with this. Thanks in advance. Regards, Jeeva
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Hi All, I'm facing a problem with the page postback. Its like....I have a treeview control whose first three levels are populating on page load. The next levels are being populated on “treeview_treenodeexpanded” event ,based on certain criteria .But each time we expand it the page gets posted back, as it is the case. I want the postback to be blocked somehow and the tree nodes need to be populated on expand event only. Is AJAX a solution for this? If so, how to implement this?:confused: I hope someone can help me out with this. Thanks in advance. Regards, Jeeva
The “treeview_treenodeexpanded” event is server-side so therefor a postback is required for this event to fire. The treeview has a built in Ajax-style feature that populates child nodes without a postback. To use it you have to set the
PopulateOnDemandproperty of nodes to true. However this will only work with theTreeNodePopulateevent, notTreeNodeExpanded. You would have to change the populating code to use that event instead. -
The “treeview_treenodeexpanded” event is server-side so therefor a postback is required for this event to fire. The treeview has a built in Ajax-style feature that populates child nodes without a postback. To use it you have to set the
PopulateOnDemandproperty of nodes to true. However this will only work with theTreeNodePopulateevent, notTreeNodeExpanded. You would have to change the populating code to use that event instead.I 'll work with this. Thanks a lot. Regards, Jeeva:)