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collapseGroup

Method which collapses a group. It receives as a parameterthe closest data row to the group header or directly the group header. The method accepts an optional parameter called Options.It provides more control over the collapse behavior.

"Options" parameter properties
expandChildrenWill expand all child groups
expandParentsWill expand all parent groups
collapseChildrenWill collapse all child groups
collapseParentsWill collapse all parent groups
toggleChildrenWill expand/collapse all child groups according to the state of the current group
toggleParentsWill expand/collapse all parent groups according to the state of the current group
findClosestGroupWill expand the first parent group

Example:

JavaScript
function CollapseGroupUsingDataItem() {
    var masterTableView = $find("<%=RadGrid1.ClientID %>").get_masterTableView();
    masterTableView.collapseGroup(masterTableView.get_dataItems()[4].get_element(),
    {
        expandParents: true,
        expandChildren: false
    });
}

function CollapseGroupUsingGroupHeader() {
    var masterTableView = $find("<%=RadGrid1.ClientID %>").get_masterTableView();
    var groupHeader = $telerik.getElementsByClassName(masterTableView.get_element(), "rgGroupHeader")[4];
    masterTableView.collapseGroup(groupHeader,
    {
        expandChildren: false,
        findClosestGroup: true
    });
}
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