AutoCompleteBoxPropertiesBase.ValueField Property
Specifies the data source field that contains values for the editor’s items.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v23.2.dll
NuGet Package: DevExpress.Web
Declaration
Property Value
| Type | Default | Description |
|---|---|---|
| String | String.Empty | The data source field name. |
Remarks
A data bound editor populates its Items collection by retrieving items from the specified data source and obtaining item characteristics (such as the item text, value or displayed image) from specific data fields. Use the ValueField property to specify a data source’s field from which the item values should be obtained.
If the ValueField property of a data bound combo box is not defined, the control can automatically obtain item values from a data field whose name is “Value”.
Important
The values contained in the ValueField field must be unique.
The ValueField property synchronizes its value with the editor’s ASPxAutoCompleteBoxBase.ValueField property.
Web Forms Example
<dx:ASPxComboBox runat="server" ID="CmbCountry" DropDownStyle="DropDownList" IncrementalFilteringMode="StartsWith"
TextField="CountryName" ValueField="CountryName" Width="100%" DataSourceID="CountriesDataSource"
EnableSynchronization="False">
<ClientSideEvents SelectedIndexChanged="function(s, e) { OnCountryChanged(s); }" />
</dx:ASPxComboBox>
var lastCountry = null;
function OnCountryChanged(cmbCountry) {
if (cmbCity.InCallback())
lastCountry = cmbCountry.GetValue().toString();
else
cmbCity.PerformCallback(cmbCountry.GetValue().toString());
}
function OnEndCallback(s, e) {
if (lastCountry) {
cmbCity.PerformCallback(lastCountry);
lastCountry = null;
}
}
MVC Example
@Html.DevExpress().ComboBox(settings => {
settings.Name = "City";
settings.Properties.TextField = "Name";
settings.Properties.ValueField = "ID";
...
settings.Properties.ClientSideEvents.BeginCallback = "function(s, e) { e.customArgs['Country'] = Country.GetValue(); }";
}).BindList(CS.Models.City.GetCities(Model.Country)).Bind(Model.City).GetHtml()
...
@Html.DevExpress().ComboBox(settings => {
settings.Name = "Country";
settings.Properties.TextField = "Name";
settings.Properties.ValueField = "ID";
...
settings.Properties.ClientSideEvents.SelectedIndexChanged = "function(s, e) { City.PerformCallback(); }";
}).BindList(CS.Models.Country.GetCountries()).Bind(Model.Country).GetHtml()
Related GitHub Examples
The following code snippets (auto-collected from DevExpress Examples) contain references to the ValueField property.
Note
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