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Long text in TreeList does not align with the corresponding level

Environment

Product TreeList for Blazor

Description

When a text is longer than the column width, it does a line break but the next line doesn't take into account the depth level and starts at the very left.

treelist-long-text-not-aligned

Solution

The following example showcases a CSS way to change the described behavior.

To align all lines of text to the same level do the following:

  1. Use the Class parameter to set a CSS class to the TreeList and cascade so you affect only its elements, not all instances on the page/app.
  2. Create a CSS class setting a default height for the cell and add it to the row through the OnCellRender event.
  3. The treelist component implements child hierarchy levels padding through hidden spans with classes k-icon and k-i-none. Use those classes along with the TreeList class to cascade the spans and expand their height to 100% and float to left so that they take up the height of the cell and text remains only to their right.

treelist-long-text-aligned


@*Align the child element text with custom CSS*@

<style>
    .MyTreeList .defaultHeight {
        height: 50px;
    }

    .MyTreeList .defaultHeight .k-icon.k-i-none {
        float: left;
        height: 100%;
    }
</style>

<TelerikTreeList Data="@Data"
                 IdField="EmployeeId"
                 ParentIdField="ReportsTo"
                 Pageable="true"
                 Class="MyTreeList">
    <TreeListColumns>
        <TreeListColumn OnCellRender="@( (TreeListCellRenderEventArgs e) => e.Class="defaultHeight" )"  
                        Field="FirstName" Expandable="true">
        </TreeListColumn>
        <TreeListColumn Field="EmployeeId"></TreeListColumn>
    </TreeListColumns>
</TelerikTreeList>

@code {
    public List<Employee> Data { get; set; }

    public class Employee
    {
        public int EmployeeId { get; set; }
        public string FirstName { get; set; }
        public int? ReportsTo { get; set; }
    }

    protected override void OnInitialized()
    {
        Data = new List<Employee>();
        var rand = new Random();
        int currentId = 1;

        for (int i = 1; i < 3; i++)
        {
            Data.Add(new Employee()
            {
                EmployeeId = currentId,
                ReportsTo = null,
                FirstName = "Employee  " + i.ToString()
            });

            currentId++;
        }
        for (int i = 1; i < 3; i++)
        {
            for (int j = 0; j < 2; j++)
            {
                Data.Add(new Employee()
                {
                    EmployeeId = currentId,
                    ReportsTo = i,
                    FirstName = "Employee " + j.ToString() + " : Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. "
                });
                currentId++;
            }
        }
    }
}
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