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Data Grid
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Row Drag & Drop
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Columns
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Features
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Export to Excel
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Tree List
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Html Editor
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Tree List - Multiple Row Selection
This demo enables multiple selection mode. This mode allows users to press keyboard shortcuts or click checkboxes to select multiple rows.
The checkbox in the leftmost column header selects all rows. You can set the allowSelectAll property to false to disable the checkbox.
Multiple selection mode is non-recursive (when a row is selected, nested rows remain unselected). If users should select rows recursively, set the selection.recursive property to true. In this demo, you can use the checkbox under the TreeList component to toggle this property.
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Backend API
x
@(Html.DevExtreme().TreeList<DevExtreme.MVC.Demos.Models.TreeList.Employee>()
.ID("employees")
.DataSource(ds => ds.WebApi().Controller("TreeListEmployees").Key("ID"))
.KeyExpr("ID")
.ParentIdExpr("HeadID")
.ShowRowLines(true)
.ShowBorders(true)
.Selection(s => s
.Mode(SelectionMode.Multiple)
.Recursive(false)
)
.Columns(columns => {
columns.AddFor(m => m.FullName);
columns.AddFor(m => m.Title);
columns.AddFor(m => m.City);
columns.AddFor(m => m.State);
columns.AddFor(m => m.HireDate)
.Width(120);
})
.ColumnAutoWidth(true)
.ExpandedRowKeys(new[] { 1, 2, 10 })
.OnSelectionChanged("onSelectionChanged")
)
<div class="options">
<div class="caption">Options</div>
<div class="option">
<span>Selection Mode</span>
@(Html.DevExtreme().SelectBox()
.Value("all")
.InputAttr("aria-label", "Selection Mode")
.DataSource(new[] { "all", "excludeRecursive", "leavesOnly" })
.OnValueChanged(@<text>
function(e) {
var treeList = $("#employees").dxTreeList("instance");
treeList.clearSelection();
selectionMode = e.value;
}
</text>
)
)
</div>
<div class="option">
@(Html.DevExtreme().CheckBox()
.Value(false)
.Text("Recursive Selection")
.OnValueChanged(@<text>
function(e) {
var treeList = $("#employees").dxTreeList("instance");
treeList.clearSelection();
treeList.option("selection.recursive", e.value);
}
</text>
)
)
</div>
<div class="selected-data">
<span class="caption">Selected Records:</span>
<span id="selected-items-container">Nobody has been selected</span>
</div>
</div>
<script>
var selectionMode = "all";
function getEmployeeNames(employees) {
if (employees.length > 0) {
return employees.map(employee => employee.FullName).join(", ");
} else {
return "Nobody has been selected";
}
}
function onSelectionChanged(e) {
var selectedData = e.component.getSelectedRowsData(selectionMode);
$("#selected-items-container").text(getEmployeeNames(selectedData));
}
</script>
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TreeList includes an API to select multiple rows. For details, refer to the following article: Selection API.