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Data Grid
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Row Drag & Drop
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Selection
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Columns
- State Persistence
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Data Summaries
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Field Chooser
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Features
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Export to Excel
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Tree List
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Select Box - Customize Drop-Down Button
Use the dropDownButtonTemplate to customize the drop-down button.
This demo illustrates three customization cases:
-
Custom image
Declare animg
element in the template. -
Load indicator
Declare the load indicator and a regular icon in the template. Display the load indicator while hiding the icon, and vice versa. -
Icon that depends on the selected value
Declare the default and the selected item's icon in the template. If there is a selected item, display its icon; otherwise, show the default icon.
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Backend API
x
@model IEnumerable<DevExtreme.MVC.Demos.Models.ElectronicsItem>
<div class="dx-fieldset">
<div class="dx-field">
<div class="dx-field-label">Image as the icon</div>
<div class="dx-field-value">
@(Html.DevExtreme().SelectBox()
.DataSource(d => d.Mvc().LoadAction("GetProductNames"))
.InputAttr("aria-label", "Simple Product")
.DropDownButtonTemplate(@<text>
<img alt="Custom icon" src="~/Content/images/icons/custom-dropbutton-icon.svg" class="custom-icon" />
</text>)
)
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">Load indicator as the icon</div>
<div class="dx-field-value">
@(Html.DevExtreme().SelectBox()
.DataSource(d => d.Mvc().LoadAction("GetProductNames"))
.InputAttr("aria-label", "Product")
.DataSourceOptions(dso => dso.OnLoadingChanged("selectBox_loadingChanged"))
.DropDownButtonTemplate(@<text>
@(Html.DevExtreme().LoadIndicator()
.ID("dropDownButtonLoadIndicator")
.Visible(false)
)
<img alt="Custom icon" src="~/Content/images/icons/custom-dropbutton-icon.svg" class="custom-icon" id="dropDownButtonImage" />
</text>)
)
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">Value-dependent icon</div>
<div class="dx-field-value">
@(Html.DevExtreme().SelectBox()
.DataSource(Model)
.ShowClearButton(true)
.InputAttr("aria-label", "Templated Product")
.DisplayExpr("Name")
.ValueExpr("ID")
.Value(1)
.ItemTemplate(@<text>
<div class="custom-item">
<img alt="<%- Name %>" src="<%- IconSrc %>" />
<div class="product-name"><%- Name %></div>
</div>
</text>)
.OnSelectionChanged("selectBox_selectionChanged")
)
</div>
</div>
</div>
<script>
function selectBox_loadingChanged(isLoading) {
$("#dropDownButtonLoadIndicator").dxLoadIndicator("option", "visible", isLoading);
$("#dropDownButtonImage").toggle(!isLoading);
}
function getDropDownButtonTemplate(selectedItem) {
if(selectedItem) {
return function () {
return $("<img>", {
alt: "Custom icon",
src: selectedItem.IconSrc,
class: "custom-icon"
});
}
}
return "dropDownButton";
}
function selectBox_selectionChanged(e) {
e.component.option("dropDownButtonTemplate", getDropDownButtonTemplate(e.selectedItem));
}
</script>
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