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Customize the expand and collapse icons

You can customize TreeView expand and collapse icons by using the CssClass  property of TreeView. Refer to the sample to customize expand/collapse icons.

@using Syncfusion.EJ2.Blazor.Navigations
<EjsTreeView TValue="DriveData" CssClass="custom">
    <TreeViewFieldsSettings TValue="DriveData" Id="NodeId" Text="NodeText" Child="@Child" DataSource="@Drive" Expanded="Expanded"></TreeViewFieldsSettings>
</EjsTreeView>

@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;
    }

    object Child;
    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"
        });
        this.Child = "Children";
    }
}

<style>
    .custom .e-list-item .e-icons {
        font-family: "Customize-icon";
    }

    .custom.e-treeview .e-list-item .e-icon-expandable::before, .custom.e-treeview .e-list-item .e-icon-collapsible:before {
        content: '\e700';
        font-size: 12px;
    }

    @@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>

Output be like the below.

TreeView Sample

Customize expand/collapse icon’s position and color

You can also customize the expand/collapse icon’s position and color using following CSS.

@using Syncfusion.EJ2.Blazor.Navigations
<div id="treeview">
    <EjsTreeView TValue="TreeViewData" CssClass="custom-tree">
        <TreeViewFieldsSettings Id="NodeId" ParentID="ParentId" DataSource="@ListData" Text="NodeText" HasChildren="HasChild" Expanded="Expanded" IconCss="IconCss"></TreeViewFieldsSettings>
    </EjsTreeView>
</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,AAEAAAAPAIAAAwBwR1NVQiCLJXoAAAD8AAAAVE9TLzI+JUkyAAABUAAAAFZjbWFw0almQAAAAagAAAIgY3Z0IAbV/vwAABfUAAAAIGZwZ22KkZBZAAAX9AAAC3BnYXNwAAAAEAAAF8wAAAAIZ2x5Zk3OJrMAAAPIAAAPrGhlYWQTw6AfAAATdAAAADZoaGVhB2gDnAAAE6wAAAAkaG10eDHm//YAABPQAAAAOGxvY2EejhqYAAAUCAAAAB5tYXhwAfYMkAAAFCgAAAAgbmFtZcydHiAAABRIAAACzXBvc3RuKDzPAAAXGAAAALRwcmVw5UErvAAAI2QAAACGAAEAAAAKADAAPgACREZMVAAObGF0bgAaAAQAAAAAAAAAAQAAAAQAAAAAAAAAAQAAAAFsaWdhAAgAAAABAAAAAQAEAAQAAAABAAgAAQAGAAAAAQAAAAEDkAGQAAUAAAJ6ArwAAACMAnoCvAAAAeAAMQECAAACAAUDAAAAAAAAAAAAAAAAAAAAAAAAAAAAAFBmRWQAQOgB6BMDUv9qAFoDUgCaAAAAAQAAAAAAAAAAAAUAAAADAAAALAAAAAQAAAF0AAEAAAAAAG4AAwABAAAALAADAAoAAAF0AAQAQgAAAAYABAABAALoCegT//8AAOgB6BD//wAAAAAAAQAGABYAAAABAAIAAwAEAAUABgAHAAgACQAKAAsADAANAAABBgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAAAAAACsAAAAAAAAAA0AAOgBAADoAQAAAAEAAOgCAADoAgAAAAIAAOgDAADoAwAAAAMAAOgEAADoBAAAAAQAAOgFAADoBQAAAAUAAOgGAADoBgAAAAYAAOgHAADoBwAAAAcAAOgIAADoCAAAAAgAAOgJAADoCQAAAAkAAOgQAADoEAAAAAoAAOgRAADoEQAAAAsAAOgSAADoEgAAAAwAAOgTAADoEwAAAA0AAwAA//kDWgLEAA8AHwAvADdANCgBBAUIAAIAAQJHAAUABAMFBGAAAwACAQMCYAABAAABVAABAQBYAAABAEwmNSY1JjMGBRorJRUUBgchIiYnNTQ2NyEyFgMVFAYnISImJzU0NhchMhYDFRQGIyEiJic1NDYXITIWA1kUEPzvDxQBFg4DEQ8WARQQ/O8PFAEWDgMRDxYBFBD87w8UARYOAxEPFmRHDxQBFg5HDxQBFgEQSA4WARQPSA4WARQBDkcOFhYORw8WARQAAAAABQAA/2oD6ANSAB8AIgAlADMAPABsQGkjAQAGHQEJACcgAgcFA0cMAQAACQUACV4ABQAHBAUHYAAEAAoIBApgAAgAAgsIAmAABgYDWAADAwxIDQELCwFYAAEBDQFJNDQBADQ8NDw7OTY1MC8uLCkoJSQiIRoXDgwJBgAfAR4OBRQrATIWFxEUBgchIiYnNSEiJicRNDY/AT4BOwEyFhcVNjMPATMBBzMXNzUjFRQGByMRITU0NgERIxUUBicjEQOyFx4BIBb96RceAf7RFx4BFhDkDzYW6BceASYhR6en/punp22w1h4X6QEeFgIm1x4X6AJ8IBb9WhceASAWoCAWAXcWNg/kEBYgFrcXd6cBfafCsOnpFh4B/puPFjb+TgKD6BYgAf6aAAAJAAD/+QPoAwsADwAfAC8APwBPAF8AbwB/AI8AT0BMEQ0CBxAMAgYDBwZgDwkCAw4IAgIBAwJgCwUCAQAAAVQLBQIBAQBYCgQCAAEATI6LhoN+e3ZzbmtmY15bVlNOSzU1NTU1NTU1MxIFHSslFRQGByMiJic1NDYXMzIWExUUBicjIiYnNTQ2NzMyFgEVFAYHIyImJzU0NhczMhYBFRQGKwEiJic1NDY7ATIWARUUBicjIiYnNTQ2NzMyFgEVFAYHIyImPQE0NhczMhYBFRQGKwEiJic1NDY7ATIWARUUBicjIiY9ATQ2NzMyFhMVFAYrASImPQE0NjsBMhYBHiAWshceASAWshceASAWshceASAWshceAWYgFrIXHgEgFrIXHv6cIBayFx4BIBayFx4BZiAWshceASAWshceAWYgFrIWICAWshce/pwgFrIXHgEgFrIXHgFmIBayFiAgFrIXHgEgFrIWICAWshcemmwWHgEgFWwWIAEeAQZrFiABHhdrFx4BIP7NbBYeASAVbBYgAR4CJGsWICAWaxYgIP7MaxYgAR4XaxceASD+zWwWHgEgFWwWIAEeAiRrFiAgFmsWICD+zGsWIAEeF2sXHgEgAQhrFiAgFmsWICAAAAMAAP+5BBYCugAUACQAOQAeQBsuEQIAAQFHAwEBAAFvAgEAAGY1NCgnFxIEBRYrJQcGIicBJjQ3ATYyHwEWFA8BFxYUAQMOAS8BLgE3Ez4BHwEeAQkBBiIvASY0PwEnJjQ/ATYyFwEWFAFYHAUOBv78BgYBBAUQBBwGBtvbBgFE0AIOBiIIBgHRAgwHIwcIAWz+/AYOBhwFBdvbBQUcBg4GAQQFRRwFBQEFBQ4GAQQGBhwFEATc2wYOAk79LwcIAwkDDAgC0AgGAQoCDv6P/vsFBRwGDgbb3AUOBhwGBv78BRAAAAMAAP+xA30DCwAIABgAVQBOQEtKAQgHHxsCAAMAAQEAMRECAgEERwAHCAdvAAgDCG8GAQMAA28AAAEAbwAEAgRwAAECAgFUAAEBAlgFAQIBAkwvLBUkPyY1ExIJBR0rNzQuAQ4BHgE2ExEUBgcjIiYnETQ2FzMyFgUUBxYVFgcWBwYHFgcGByMiLgEnJiciJicRND4CNzY3PgI3PgMzMh4EBhcUDgEHDgIHMzIWjxYdFAEWHRRaFBCgDxQBFg6gDxYClB8JARkJCQkWBSAkSkglVjIqRRMPFAEUGzocJhIKDgYFBAYQFQ8ZKhgUCAYCAgwIDAEIBAObK0BkDxQBFh0UARYBLP6bDxQBFg4BZQ4WARQPMCMZEioiHyMfFT4nKwESDg8YARYOAWUOFgFAIzESCiIUGBYYIhYMEhoYIBINFSwWFAQMDgZAAAAACwAA/7EDWQNSAA8AHwAvAD8ATwBfAG8AfwCPAJ8ArwD6QPesARITnAEODzkBDQ6MLQIKC3wBBgdsAQIDBkcAFAAUcCkBEiYBERASEWAoLgITJwEQDxMQYCUBDiIBDQwODWAkLQIPIwEMCw8MYCEBCh4BCQgKCWAgLAILHwEIBwsIYB0BBhoBBQQGBWAcKwIHGwEEAwcEYBkBAhYBAQACAWAYKgIDFwEAFAMAYAAVFQwVSUBAMDAgIBAQAACvraqpqKakop+dmpmYlpSSj42KiYiGhIJ/fXp5eHZ0cm9tamloZmRiXltWU0BPQE5MSkdFQ0EwPzA+PDs3NTMxIC8gLywqJyUjIRAfEB4cGhcVExEADwAOIyIhLwUXKzcVIyI9ASMiPQE0OwE1NDM3FSMiPQEjIj0BNDsBNTQzNxUjIj0BIyI9ATQ7ATU0MzcVIyI9ASMiPQE0OwE1NDM3FSMiPQEjIj0BNDsBNTQzJREUBiMhIiYnETQ2NyEyFhMVFCsBFRQrATUzMh0BMzI1FRQrARUUKwE1MzIdATMyNRUUKwEVFCsBNTMyHQEzMjUVFCsBFRQrATUzMh0BMzI1FRQrARUUKwE1MzIdATMyaz4JGwkJGwk+PgkbCQkbCT4+CRsJCRsJPj4JGwkJGwk+PgkbCQkbCQKdHhf+LxYeASAVAdEWII4JGwg/PwgbCQkbCD8/CBsJCRsIPz8IGwkJGwg/PwgbCQkbCD8/CBsJiEgJCQkSCQkJj0gJCQkSCQkJjkcJCQkSCQkIj0cJCQkSCAkJj0cJCQkRCQkJWfzLFiAgFgM1Fx4BIP07EgkJCUgJCYYSCQkJSAkJhhIJCQlHCAmGEgkJCUcJCYYRCQkJRwkJAAAEAAD/ZgPzA1IADwAeACwAOQDhS7AJUFhADwQBAQAFAQUCGhkCAwUDRxtLsApQWEAPBAEBAAUBBQQaGQIDBQNHG0APBAEBAAUBBQIaGQIDBQNHWVlLsAlQWEAkAAEAAgABAm0HBAICBQACBWsABQMABQNrBgEAAAxIAAMDDQNJG0uwClBYQCoAAQACAAECbQACBAACBGsHAQQFAAQFawAFAwAFA2sGAQAADEgAAwMNA0kbQCQAAQACAAECbQcEAgIFAAIFawAFAwAFA2sGAQAADEgAAwMNA0lZWUAXLi0BADQzLTkuOSYlIB8KCQAPAQ8IBRQrAQYHBgcXPgIXBSYnJicmBQYHBhUUFx4BFzcGLgEnAQUeAQYHAxY2NzY3PgElIg4BFB4BMj4BNC4BAfJwZWdHmhNSbDoBniAxMkFz/dcoFBY4N8F3gDlwWBgCuf7mJh0UIuJIjUFqQj8Z/gIuTS4uTVxNLi5NA1IBMDFY7TdRKAYWQDQ2JkPiPEVGS3tsaYwS/AseSjUBFA8scHIv/qUFISY9Z2TtZS5NXE0uLk1cTS4AAAAAAv/9/7EDXwMLABAAHQArQCgAAwQBAAEDAGAAAQICAVQAAQECWAACAQJMAQAbGhUUCQgAEAEQBQUUKwEiDgMeAj4DNC4CARQOASIuAj4BMh4BAa1JhGA4AjxciI6GXjo6XoYBZXLG6MhuBnq89Lp+AsM4YISShF48BDRmfJp8aDD+n3XEdH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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;
    }

    /*To change the text color for treeview*/
    .e-treeview .e-text-content > .e-list-text {
        color: white;
    }
</style>

Output be like the below.

TreeView Sample

Increase the padding between the text, expand/collapse icon and custom icons

You can increase the padding between the text, expand/collapse icon and custom icons using 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;
    }

Output be like the below.

TreeView Sample