DropDownTree Appearance
As of the R1 2022 release, the DropDownTree component uses a new rendering. To learn more about why we decided to create a new rendering for our components, see the Components Rendering Overview article.
For a live example of the styling options of the DropDownTree, visit the Appearance Demo of the DropDownTree.
Options
The DropDownTree supports the following styling options:
-
Size—configures the overall size of the component. -
Rounded—configures the border radius of the component. -
FillMode—configures how the color is applied to the component.
Size
The Size option controls the size of the DropDownTree. The k-input-{size} class, which is applied to the wrapping span element of the DropDownTree, reflects the value of the Size option. The k-input-{size} class is used when the DropDownTree is configured for Multiple Selection. When Single Selection is used in the DropDownTree, the class we apply is k-picker-{size}. The option also affects the span.k-chip element through the k-chip-{size} class.
The following values are available for the Size option:
-
Small—small size (applies thek-input-smclass to the wrapping span element) -
Medium—medium size (applies thek-input-mdclass to the wrapping span element) -
Large—large size (applies thek-input-lgclass to the wrapping span element) -
None—unset.
The following example demonstrates how to set Size in the declaration of the DropDownTree:
@(Html.Kendo().DropDownTree()
.Name("dropdowntree-single")
.HtmlAttributes(new { style = "width: 100%" })
.Height("auto")
.Placeholder("Select Product")
.DataValueField("id")
.Size(ComponentSize.Large)
.Items(items =>
{
items.Add().Text("Furniture").Id("1").Expanded(true)
.Items(children =>
{
children.Add().Text("Tables & Chairs").Id("2");
children.Add().Text("Sofas").Id("3");
children.Add().Text("Occasional Furniture").Id("4");
children.Add().Text("Childrens furniture").Id("5");
children.Add().Text("Beds").Id("6");
});
items.Add().Text("Decor").Id("7")
.Items(children =>
{
children.Add().Text("Bed Linen").Id("8");
children.Add().Text("Curtains & Blinds").Id("9");
children.Add().Text("Carpets").Id("10");
children.Add().Text("Rugs").Id("11");
children.Add().Text("Carpets").Id("12");
});
})
)
<kendo-dropdowntree datavaluefield="id" size="ComponentSize.Large" height="auto" placeholder="Select Product" name="dropdowntree-single" style="width: 100%">
<items>
<dropdowntree-item expanded="true" text="Furniture" id="1">
<items>
<dropdowntree-item expanded="false" text="Tables & Chairs" id="2">
</dropdowntree-item>
<dropdowntree-item expanded="false" text="Sofas" id="3">
</dropdowntree-item>
<dropdowntree-item expanded="false" text="Occasional Furniture" id="4">
</dropdowntree-item>
<dropdowntree-item expanded="false" text="Childerns Furniture" id="5">
</dropdowntree-item>
<dropdowntree-item expanded="false" text="Beds" id="6">
</dropdowntree-item>
</items>
</dropdowntree-item>
<dropdowntree-item expanded="false" text="Decor" id="7">
<items>
<dropdowntree-item expanded="false" text="Bed Linen" id="8">
</dropdowntree-item>
<dropdowntree-item expanded="false" text="Throws" id="9">
</dropdowntree-item>
<dropdowntree-item expanded="false" text="Curtains & Blinds" id="10">
</dropdowntree-item>
<dropdowntree-item expanded="false" text="Rugs" id="11">
</dropdowntree-item>
<dropdowntree-item expanded="false" text="Carpets" id="12">
</dropdowntree-item>
</items>
</dropdowntree-item>
</items>
</kendo-dropdowntree>
The default size value is Medium and it is applied to the span wrapping element through the k-input-md class.
Below is the HTML of the DropDownTree that is affected from the Size option. The changes are applied to the span.k-dropdowntree wrapping element:
<span class="k-dropdowntree k-picker k-dropdowntree-clearable k-picker-solid k-picker-lg k-rounded-full">
</span>
The HTML when multiple selection is configured:
<span class="k-dropdowntree k-input k-input-solid k-dropdowntree-clearable k-input-lg k-rounded-full">
</span>
Rounded
The Rounded option controls the border radius of the DropDownTree. The class that corresponds to the Rounded option is k-rounded-{rounded}.
The following values are available for the Rounded option:
-
Small—small border radius (applies thek-rounded-smclass to the wrapping span element) -
Medium—medium border radius (applies thek-rounded-mdclass to the wrapping span element) -
Large—large border radius (applies thek-rounded-lgclass to the wrapping span element) -
Full—largest (ellipse-like) border radius (applies thek-rounded-fullclass to the wrapping span element) -
None—unset.
The default value is Full. It applies the k-rounded-full class to the span.k-dropdowntree wrapping element that contains the HTML of the component.
The following example demonstrates how to set Rounded in the declaration of the DropDownTree:
@(Html.Kendo().DropDownTree()
.Name("dropdowntree-single")
.HtmlAttributes(new { style = "width: 100%" })
.Height("auto")
.Placeholder("Select Product")
.DataValueField("id")
.Rounded(Rounded.Medium)
.Items(items =>
{
items.Add().Text("Furniture").Id("1").Expanded(true)
.Items(children =>
{
children.Add().Text("Tables & Chairs").Id("2");
children.Add().Text("Sofas").Id("3");
children.Add().Text("Occasional Furniture").Id("4");
children.Add().Text("Childrens furniture").Id("5");
children.Add().Text("Beds").Id("6");
});
items.Add().Text("Decor").Id("7")
.Items(children =>
{
children.Add().Text("Bed Linen").Id("8");
children.Add().Text("Curtains & Blinds").Id("9");
children.Add().Text("Carpets").Id("10");
children.Add().Text("Rugs").Id("11");
children.Add().Text("Carpets").Id("12");
});
})
)
<kendo-dropdowntree datavaluefield="id" height="auto" rounded="Rounded.Medium" placeholder="Select Product" name="dropdowntree-single" style="width: 100%">
<items>
<dropdowntree-item expanded="true" text="Furniture" id="1">
<items>
<dropdowntree-item text="Tables & Chairs" id="2">
</dropdowntree-item>
<dropdowntree-item text="Sofas" id="3">
</dropdowntree-item>
<dropdowntree-item text="Occasional Furniture" id="4">
</dropdowntree-item>
<dropdowntree-item text="Childerns Furniture" id="5">
</dropdowntree-item>
<dropdowntree-item text="Beds" id="6">
</dropdowntree-item>
</items>
</dropdowntree-item>
<dropdowntree-item text="Decor" id="7">
<items>
<dropdowntree-item text="Bed Linen" id="8">
</dropdowntree-item>
<dropdowntree-item text="Throws" id="9">
</dropdowntree-item>
<dropdowntree-item text="Curtains & Blinds" id="10">
</dropdowntree-item>
<dropdowntree-item text="Rugs" id="11">
</dropdowntree-item>
<dropdowntree-item text="Carpets" id="12">
</dropdowntree-item>
</items>
</dropdowntree-item>
</items>
</kendo-dropdowntree>
When single selection is used, the changes are applied to the span.k-dropdowntree wrapping element:
<span class="k-dropdowntree k-picker k-dropdowntree-clearable k-picker-solid k-picker-md k-rounded-md">
</span>
The HTML when multiple selection is enabled:
<span class="k-dropdowntree k-input k-input-md k-dropdowntree-clearable k-input-solid k-rounded-md k-state-border-down">
</span>
FillMode
The FillMode option controls how color is applied to the component. The structure of the class is k-picker-{fillMode}.
The following values are available for the FillMode option:
-
Solid—applies thek-input-solidclass to the wrapping span element -
Flat—applies thek-input-flatclass to the wrapping span element -
Outline—applies thek-input-outlineclass to the wrapping span element -
None—unset.
The default value is Solid and it is applied to the span.k-dropdowntree wrapping element through the k-picker-solid class.
The following example demonstrates how to set FillMode in the declaration of the DropDownTree:
@(Html.Kendo().DropDownTree()
.Name("dropdowntree-single")
.HtmlAttributes(new { style = "width: 100%" })
.Height("auto")
.Placeholder("Select Product")
.DataValueField("id")
.FillMode(FillMode.Outline)
.Items(items =>
{
items.Add().Text("Furniture").Id("1").Expanded(true)
.Items(children =>
{
children.Add().Text("Tables & Chairs").Id("2");
children.Add().Text("Sofas").Id("3");
children.Add().Text("Occasional Furniture").Id("4");
children.Add().Text("Childrens furniture").Id("5");
children.Add().Text("Beds").Id("6");
});
items.Add().Text("Decor").Id("7")
.Items(children =>
{
children.Add().Text("Bed Linen").Id("8");
children.Add().Text("Curtains & Blinds").Id("9");
children.Add().Text("Carpets").Id("10");
children.Add().Text("Rugs").Id("11");
children.Add().Text("Carpets").Id("12");
});
})
)
<kendo-dropdowntree datavaluefield="id" height="auto" fill-mode="FillMode.Outline" placeholder="Select Product" name="dropdowntree-single" style="width: 100%">
<items>
<dropdowntree-item expanded="true" text="Furniture" id="1">
<items>
<dropdowntree-item text="Tables & Chairs" id="2">
</dropdowntree-item>
<dropdowntree-item text="Sofas" id="3">
</dropdowntree-item>
<dropdowntree-item text="Occasional Furniture" id="4">
</dropdowntree-item>
<dropdowntree-item text="Childerns Furniture" id="5">
</dropdowntree-item>
<dropdowntree-item text="Beds" id="6">
</dropdowntree-item>
</items>
</dropdowntree-item>
<dropdowntree-item text="Decor" id="7">
<items>
<dropdowntree-item text="Bed Linen" id="8">
</dropdowntree-item>
<dropdowntree-item text="Throws" id="9">
</dropdowntree-item>
<dropdowntree-item text="Curtains & Blinds" id="10">
</dropdowntree-item>
<dropdowntree-item text="Rugs" id="11">
</dropdowntree-item>
<dropdowntree-item text="Carpets" id="12">
</dropdowntree-item>
</items>
</dropdowntree-item>
</items>
</kendo-dropdowntree>
The FillMode.Outline value is reflected through the respective classes applied to the span.k-dropdowntree wrapping element:
<span class="k-dropdowntree k-picker k-picker-outline k-picker-md k-rounded-full k-dropdowntree-clearable">
</span>
The HTML when multiple selection is enabled:
<span class="k-dropdowntree k-input k-input-outline k-input-md k-dropdowntree-clearable k-rounded-full k-state-border-down">
</span>
Old vs New Rendering
Below you will find the differences between the old and the new rendering of the DropDownTree. Some of the HTML elements rendered before are replaced with others in the new rendering.
Old Single Selection Rendering:
<span title="" class="k-widget k-dropdowntree k-dropdowntree-clearable k-state-border-down" unselectable="on"
tabindex="0" aria-disabled="false" aria-haspopup="tree" aria-expanded="true"
aria-owns="d5464a25-e452-4eee-bd7a-8aebcb918a00" role="listbox"
aria-activedescendant="a18f7c00-9e73-4db1-ac81-b41bf193b1dc">
<span unselectable="on" class="k-dropdown-wrap k-state-default k-state-active k-state-border-down">
<span unselectable="on" class="k-input k-readonly" role="option" aria-selected="true"
id="a18f7c00-9e73-4db1-ac81-b41bf193b1dc">Select ...</span>
<span unselectable="on" class="k-clear-value k-hidden" title="clear" role="button" tabindex="-1">
<span class="k-icon k-i-x"></span>
</span>
<span role="button" unselectable="on" class="k-select"
aria-label="select"><span class="k-icon k-i-arrow-60-down"></span>
</span></span>
<input id="dropdowntree" style="width: 100%; display: none;" data-role="dropdowntree">
</span>
New Single Selection Rendering:
<span class="k-dropdowntree k-picker k-picker-solid k-picker-md k-rounded-md k-dropdowntree-clearable k-hover"
unselectable="on" tabindex="0" aria-disabled="false" aria-haspopup="tree" aria-expanded="false"
aria-owns="d380d0fa-2f21-4d11-90bf-d21226c147a6" role="listbox"
aria-activedescendant="de8203cb-189a-4341-92aa-d7337a65ece4" style="">
<span unselectable="on"
class="k-input-inner k-readonly" role="option" aria-selected="true"
id="de8203cb-189a-4341-92aa-d7337a65ece4">Select ...</span>
<span unselectable="on" class="k-clear-value k-hidden" title="clear" role="button" tabindex="-1"><span
class="k-icon k-i-x"></span>
</span>
<button unselectable="on"
class="k-select k-input-button k-button k-button-md k-rounded-md k-button-solid k-button-solid-base k-icon-button"
aria-label="select"><span class="k-icon k-i-arrow-60-down k-button-icon"></span>
</button>
<input id="dropdowntree" data-role="dropdowntree" style="display: none;">
</span>
Old Multiple Selection Rendering:
<div class="k-widget k-dropdowntree k-dropdowntree-clearable" unselectable="on" title=""
aria-owns="dace9881-3aee-4a51-8940-8c3278b77ff1" tabindex="0" aria-disabled="false" aria-haspopup="tree"
aria-expanded="false" role="listbox" aria-multiselectable="true"
aria-describedby="d69ca64c-e5d4-4a63-abd5-01065574092c_tagList" style="width: 100%;">
<div class="k-multiselect-wrap k-floatwrap" unselectable="on">
<ul unselectable="on" data-template="tagTemplate" data-bind="source: tags" class="k-reset"
id="d69ca64c-e5d4-4a63-abd5-01065574092c_tagList" data-stop="true" role="none">
<li class="k-button " unselectable="on" role="option" aria-selected="true"><span
unselectable="on">Sofas</span><span aria-hidden="true" title="delete" aria-label="delete"
class="k-select"><span class="k-icon k-i-close"></span></span></li>
</ul><span unselectable="on" class="k-input k-readonly" role="option" aria-selected="true"
style="display: none;">Select ...</span><span unselectable="on" class="k-clear-value" title="clear"
role="button" tabindex="-1"><span class="k-icon k-i-x"></span></span>
</div><input id="dropdowntree" style="width: 100%; display: none;" data-role="dropdowntree" multiple="multiple">
</div>
New Multiple Selection rendering:
<span class="k-dropdowntree k-input k-input-solid k-input-md k-rounded-md k-dropdowntree-clearable k-hover"
unselectable="on" title="" aria-owns="faa1c5a4-47ae-4e8a-b0c5-b8fa95443a5a" tabindex="0" aria-disabled="false"
aria-haspopup="tree" aria-expanded="false" role="listbox" aria-multiselectable="true"
aria-describedby="f809adf5-0db6-4945-a17a-9b408a9fd86b_tagList" style="">
<select id="dropdowntree1"
data-role="dropdowntree" multiple="multiple" style="display: none;"></select>
<div unselectable="on" class="k-input-values k-chip-list k-chip-list-md" data-template="tagTemplate"
data-bind="source: tags" id="f809adf5-0db6-4945-a17a-9b408a9fd86b_tagList" data-stop="true" role="none">
<span unselectable="on" class="k-input-inner k-readonly" role="option" aria-selected="true"
style="display: flex;">Select ...</span>
</div>
<span unselectable="on" class="k-clear-value" title="clear"
role="button" tabindex="-1"><span class="k-icon k-i-x"></span></span>
</span>
Visual Backwards Compatibility
In order to achieve the same look and feel as the old rendering, make sure to use the classes available in the new rendering. Visit the CSS Classes Migration and JQuery Selectors Migration sections of the Appearance Overview article for additional information.
If you use a LESS theme, the new rendering will support only the default options.
The following example showcases how to change the background colors of the input elements of the DropDownTree in both the new, and the old rendering:
<style>
/* Doesn't work BEFORE R1 2022 */
.k-input-inner{ /* customize the style input */
background: lightyellow;
}
.k-treeview-item{ /* customize the style of the items in the popup */
background: pink;
}
.k-treeview-leaf{ /* customize the styles of the items in the popup */
background-color: #FFDFDD;
border: 1px solid purple;
}
.k-treeview-leaf-text{
color: purple;
}
.k-selected{ /* customize the styles of the selected items in the popup */
background-color: purple !important;
}
.k-selected .k-treeview-leaf-text{ /* customize the text of the selected item in the popup */
color: white;
}
/*customize nodataTemplate */
.k-no-data{
color: fuchsia !important;
font-weight: bold;
}
/* Doesn't work AFTER R1 2022 */
/* .k-item{ background: red; } k-item will style the items in the DropDownTree with the old as well as with the new rendering */
.k-input{
background-color: salmon !important;
}
.k-textbox{
background-color: #FED8B1;
}
.k-item .k-in{ /* customize the style of the items in the popup */
color: orange;
background-color: lightyellow;
}
.k-state-selected{ /* customize the styles of the selected items in the popup */
background-color: #FED8B1 !important;
border: 2px solid orange !important;
color: brown !important;
}
.k-state-selected:hover{ /* customize the styles of the selected items in the popup */
background-color: orange !important;
color: white !important;
}
/*customize nodataTemplate */
.k-nodata{
color: red;
}
</style>
## See Also
* [Appearance Overview Article](/aspnet-core/styles-and-layout/components-rendering-overview)
* [Appearance Demo of the DropDownTree](https://demos.telerik.com/aspnet-core/dropdowntree/appearance)