Customize the expand and collapse icons in Blazor TreeView Component
21 Feb 202515 minutes to read
TreeView expand and collapse icons could be customized by using the CssClass property of TreeView. Refer to the sample to customize expand or collapse icons.
@using Syncfusion.Blazor.Navigations
<SfTreeView TValue="DriveData" CssClass="custom">
<TreeViewFieldsSettings TValue="DriveData" Id="NodeId" Text="NodeText" Child="Children" DataSource="@Drive" Expanded="Expanded"></TreeViewFieldsSettings>
</SfTreeView>
@code{
public class DriveData
{
public string? NodeId { get; set; }
public string? NodeText { get; set; }
public bool Expanded { get; set; }
public bool Selected { get; set; }
public List<DriveData> Children;
}
List<DriveData> Drive = new List<DriveData>();
protected override void OnInitialized()
{
base.OnInitialized();
List<DriveData> Folder1 = new List<DriveData>();
Drive.Add(new DriveData
{
NodeId = "01",
NodeText = "Local Disk (C:)",
Expanded = true,
Children = Folder1,
});
List<DriveData> File1 = new List<DriveData>();
Folder1.Add(new DriveData
{
NodeId = "01-01",
NodeText = "Program Files",
Children = File1
});
File1.Add(new DriveData
{
NodeId = "01-01-01",
NodeText = "Windows NT"
});
List<DriveData> File2 = new List<DriveData>();
Folder1.Add(new DriveData
{
NodeId = "01-02",
NodeText = "Users",
Expanded = true,
Children = File2
});
File2.Add(new DriveData
{
NodeId = "01-02-01",
NodeText = "Smith"
});
File2.Add(new DriveData
{
NodeId = "01-02-02",
NodeText = "Public"
});
List<DriveData> File3 = new List<DriveData>();
Folder1.Add(new DriveData
{
NodeId = "01-03",
NodeText = "Windows",
Children = File3
});
File3.Add(new DriveData
{
NodeId = "01-03-01",
NodeText = "Boot"
});
List<DriveData> Folder2 = new List<DriveData>();
Drive.Add(new DriveData
{
NodeId = "02",
NodeText = "Local Disk (D:)",
Children = Folder2,
});
Folder2.Add(new DriveData
{
NodeId = "02-01",
NodeText = "Personals"
});
Folder2.Add(new DriveData
{
NodeId = "02-02",
NodeText = "Projects"
});
}
}
<style>
.custom .e-list-item .e-icons {
font-family: "Customize-icon";
}
.custom.e-treeview .e-list-item div.e-icons.e-icon-expandable::before,
.custom.e-treeview .e-list-item div.e-icons.e-icon-collapsible::before {
content: '\e700';
font-size: 12px;
}
.e-treeview.custom .e-icons.e-icon-collapsible, .e-treeview.custom .e-icons.e-icon-expandable {
margin-top: 8px;
}
@@font-face {
font-family: 'Customize-icon';
src: url(data:application/x-font-ttf;charset=utf-8;base64,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) format('truetype');
font-weight: normal;
font-style: normal;
}
</style>
Customize expand/collapse icon’s position and color
The expand or collapse icon’s position and color can also customized using following CSS.
@using Syncfusion.Blazor.Navigations
<div id="treeview">
<SfTreeView TValue="TreeViewData" CssClass="custom-tree">
<TreeViewFieldsSettings Id="NodeId" ParentID="ParentId" DataSource="@ListData" Text="NodeText" HasChildren="HasChild" Expanded="Expanded" IconCss="IconCss"></TreeViewFieldsSettings>
</SfTreeView>
</div>
@code
{
public class TreeViewData
{
public string? NodeId { get; set; }
public string? NodeText { get; set; }
public string? ParentId { get; set; }
public bool HasChild { get; set; }
public string? IconCss { get; set; }
public bool Expanded { get; set; }
}
List<TreeViewData> ListData = new List<TreeViewData>();
protected override void OnInitialized()
{
base.OnInitialized();
ListData = new List<TreeViewData>();
ListData.Add(new TreeViewData
{
NodeId = "1",
NodeText = "Installation",
IconCss = "icon-microchip icon"
});
ListData.Add(new TreeViewData
{
NodeId = "2",
NodeText = "Deployment",
IconCss = "icon-thumbs-up-alt icon"
});
ListData.Add(new TreeViewData
{
NodeId = "3",
NodeText = "Quick Start",
IconCss = "icon-docs icon"
});
ListData.Add(new TreeViewData
{
NodeId = "4",
NodeText = "Components",
HasChild = true,
IconCss = "icon-th icon",
Expanded = true
});
ListData.Add(new TreeViewData
{
NodeId = "5",
ParentId = "4",
NodeText = "Calendar",
IconCss = "icon-circle-thin icon"
});
ListData.Add(new TreeViewData
{
NodeId = "7",
ParentId = "4",
IconCss = "icon-circle-thin icon",
NodeText = "DatePicker",
});
ListData.Add(new TreeViewData
{
NodeId = "8",
ParentId = "4",
IconCss = "icon-circle-thin icon",
NodeText = "DateTimePicker",
});
ListData.Add(new TreeViewData
{
NodeId = "9",
NodeText = "API Reference",
HasChild = true,
IconCss = "icon-code icon",
});
ListData.Add(new TreeViewData
{
NodeId = "10",
ParentId = "9",
NodeText = "Calendar",
IconCss = "icon-circle-thin icon"
});
ListData.Add(new TreeViewData
{
NodeId = "11",
ParentId = "9",
NodeText = "DatePicker",
IconCss = "icon-circle-thin icon"
});
ListData.Add(new TreeViewData
{
NodeId = "12",
IconCss = "icon-chrome icon",
NodeText = "Browser Compatibility",
});
ListData.Add(new TreeViewData
{
NodeId = "13",
NodeText = "Upgrade Packages",
IconCss = "icon-up-hand icon"
});
ListData.Add(new TreeViewData
{
NodeId = "14",
NodeText = "FAQ",
IconCss = "icon-help-circled icon"
});
}
}
<style>
/*To apply border and background color for treeview*/
#treeview {
max-width: 400px;
margin: auto;
border: 1px solid #dddddd;
border-radius: 3px;
background: #1c86c8;
}
/* customize icon styles */
.e-treeview.custom-tree .e-list-icon {
font-family: 'fontello';
font-size: 16px;
margin-top: -4px;
color: white;
}
/* icon styles */
@@font-face {
font-family: 'fontello';
src: url('data:application/octet-stream;base64,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format('truetype');
}
.e-treeview.custom-tree .e-list-icon.icon-microchip::before {
content: '\e806';
}
.e-treeview.custom-tree .e-list-icon.icon-thumbs-up-alt::before {
content: '\e805';
}
.e-treeview.custom-tree .e-list-icon.icon-chrome::before {
content: '\e807';
}
.e-treeview.custom-tree .e-list-icon.icon-up-hand::before {
content: '\e810';
}
.e-treeview.custom-tree .e-list-icon.icon-docs::before {
content: '\e802';
}
.e-treeview.custom-tree .e-list-icon.icon-th::before {
content: '\e803';
}
.e-treeview.custom-tree .e-list-icon.icon-code::before {
content: '\e804';
}
.e-treeview.custom-tree .e-list-icon.icon-help-circled::before {
content: '\e813';
}
.e-treeview.custom-tree .e-list-icon.icon-circle-thin::before {
content: '\e808';
}
/*To float the expand/collapse icon right*/
.e-treeview.custom-tree .e-icon-collapsible, .e-treeview .e-icon-expandable {
float: right;
}
/*To customize the expand collapse icon color*/
.e-treeview.custom-tree .e-icon-collapsible::before, .e-treeview.custom-tree .e-icon-expandable::before {
color: white;
}
.e-treeview.custom-tree .e-icons.e-icon-collapsible, .e-treeview.custom-tree .e-icons.e-icon-expandable {
margin-top:8px;
}
/*To change the text color for treeview*/
.e-treeview .e-text-content > .e-list-text {
color: white;
}
</style>
Increase the padding between the text, expand/collapse icon and custom icons
The padding between the text, expand or collapse icon and custom icons can be increased using the following CSS in the above sample.
/* customize icon styles */
.e-treeview.custom-tree .e-list-icon {
font-family: 'fontello';
font-size: 16px;
margin-top: -4px;
color: white;
/*To increase the padding between icon and text*/
margin-left: -20px;
}
/*To float the expand/collapse icon right*/
.e-treeview.custom-tree .e-icon-collapsible, .e-treeview .e-icon-expandable {
float: right;
/*To increase the space between the text and chevron*/
margin-right: 20px;
}
/*To change the text color for treeview*/
.e-treeview .e-text-content > .e-list-text {
color: white;
/*To increase the padding between the text*/
padding-left: 25px;
}