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Rank: Newbie
Groups: Member
Joined: 9/16/2009
Posts: 4
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Hello
I am using the TreeView component, along with a CallbackPanel, when a node is checked in treeviiw, update a GridView which is inside the CallbackPanel. I'm having a problem using the options AutoCheckChildren and AutoUncheckChildren options set to true. Clicking on a node that has 10 children, the event is fired for each child node. Would it not happen?
Thanks
Lincoln
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,080
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Hi,
Which event is fired for each child node? Can you provide a test page that demonstrates the problem?
Thanks
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Rank: Newbie
Groups: Member
Joined: 9/16/2009
Posts: 4
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The Clientside event OnTreeNodeClick active CallbackPanel the event, which triggers the event to update the GridView.
Treeview:
<eo:TreeView ID="TreeView1" runat="server" Height="100%"
onitempopulate="TreeView1_ItemPopulate" StateCookieName="TreeView" Width="100%"
onitemcheckstatechanged="TreeView1_ItemCheckStateChanged"
ClientSideOnCheckStateChanging="OnTreeNodeClick" AutoScroll="False" AutoCheckChildren="True" AutoUncheckChildren="True" RaisesServerEvent="True">
<LookNodes>
<eo:TreeNode ItemID="_Default">
</eo:TreeNode>
</LookNodes>
<CheckBoxImages Visible="True" />
<TopGroup Style-CssText="cursor:hand">
</TopGroup>
</eo:TreeView>
Javascript:
function OnTreeNodeClick(e, info) {
var node = info.getValue();
eo_Callback("cbPanel", node);
}
CBPanel Event:
private void cbPanel_Execute(object sender, EO.Web.CallbackEventArgs e)
{
AtualizaGrid(e.Parameter);
}
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,080
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Hi, This is normal. Because indeed the child node's check state has changed, so it will fire ClientSideOnCheckStateChanging event. You can use a timer to delay eo_Callback and if your OnTreeNodeClick sees a callback is already pending, then it does nothing. It will be something like this:
Code: JavaScript
//Global variable that indicates whether we are about to
//trigger a callback
var callback_pending = false;
function OnTreeNodeClick(e, info)
{
//Does nothing if a callback is about to happen
if (callback_pending)
return;
//Otherwise go ahead and schedule a callback
callback_pending = true;
setTimeout(function()
{
//Reset flag
callback_pending = false;
//Continue with callback
var node = info.getValue();
eo_Callback("cbPanel", node);
}, 20);
}
This way the callback will only be fired once. Hope this helps. Thanks
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Rank: Newbie
Groups: Member
Joined: 9/16/2009
Posts: 4
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Perfect! It worked as expected. thank you very much!
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,080
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Great. Glad it worked for you!
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