DevExtreme jQuery - Handle the Value Change Event
To process a new form item value, you need to handle the fieldDataChanged event. If the handling function is not going to be changed during the lifetime of the widget, assign it to the onFieldDataChanged option when you configure the widget.
jQuery
JavaScript
$(function() {
$("#formContainer").dxForm({
onFieldDataChanged: function (e) {
var updatedField = e.dataField;
var newValue = e.value;
// Event handling commands go here
}
});
});Angular
HTML
TypeScript
<dx-form ...
(onFieldDataChanged)="form_fieldDataChanged($event)">
</dx-form>
import { DxFormModule } from "devextreme-angular";
// ...
export class AppComponent {
// ...
form_fieldDataChanged (e) {
let updatedField = e.dataField;
let newValue = e.value;
// Event handling commands go here
}
}
@NgModule({
imports: [
// ...
DxFormModule
],
// ...
})If you are going to change event handlers at runtime, or if you need to attach several handlers to the fieldDataChanged event, subscribe to this event using the on(eventName, eventHandler) method. This approach is more typical of jQuery.
JavaScript
var fieldDataChangedHandler1 = function (e) {
var updatedField = e.dataField;
var newValue = e.value;
// First handler of the "fieldDataChanged" event
};
var fieldDataChangedHandler2 = function (e) {
var updatedField = e.dataField;
var newValue = e.value;
// Second handler of the "fieldDataChanged" event
};
$("#formContainer").dxForm("instance")
.on("fieldDataChanged", fieldDataChangedHandler1)
.on("fieldDataChanged", fieldDataChangedHandler2);See Also
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