@terminus/ngx-tools
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35 lines • 3.83 kB
JavaScript
import { inputHasChanged } from '../input-has-changed/input-has-changed';
import { NgChangeObjectValueParser } from '../ngchange-object-value-parser/ngchange-object-value-parser';
/**
* Helper function to determine if a specific value has changed
*
* @param changes - The object of changes
* @param path - A string with keys defined, separate with '.'
* @param control - The formControl
* @returns True if the value has changed
*
* @example
* ...
* AngularInput:
* public myInput;
* AngularInput:
* public myFormControl;
*
* ngOnChanges(changes: SimpleChanges) {
* // This will update the form control's value whenever the `@Input` value changes:
* updateControlOnInputChanges(changes, 'myInput', this.myFormControl));
* }
* ...
*/
export function updateControlOnInputChanges(changes, path, control) {
if (!changes || !path || !control) {
return false;
}
if (inputHasChanged(changes, path)) {
const newValue = NgChangeObjectValueParser.getNewValue(changes, path);
control.setValue(newValue);
return true;
}
return false;
}
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