Method updateTwoWay

packages/core/ui/core/bindable/index.ts:318–357

(value: any)

	}

	private updateTwoWay(value: any) {
		if (this.updating || !this.options.twoWay) {
			return;
		}

		let newValue = value;
		if (__UI_USE_EXTERNAL_RENDERER__) {
		} else if (this.options.expression) {
			const changedModel = {};
			const targetInstance = this.target.get();
			let sourcePropertyName = '';
			if (this.sourceOptions) {
				sourcePropertyName = this.sourceOptions.property;
			} else if (typeof this.options.sourceProperty === 'string' && this.options.sourceProperty.indexOf('.') === -1) {
				sourcePropertyName = this.options.sourceProperty;
			}

			const updateExpression = this.prepareExpressionForUpdate();
			this.prepareContextForExpression(targetInstance, changedModel, updateExpression);

			/**
			 * Wait for 'prepareContextForExpression' to assign keys first and override any possible occurences.
			 * For example, 'bindingValueKey' key can result in a circular reference if it's set in both cases.
			 */
			changedModel[bc.bindingValueKey] = value;
			changedModel[bc.newPropertyValueKey] = value;
			if (sourcePropertyName !== '') {
				changedModel[sourcePropertyName] = value;
			}

			const expressionValue = this._getExpressionValue(updateExpression, true, changedModel);
			if (expressionValue instanceof Error) {
				Trace.write((<Error>expressionValue).message, Trace.categories.Binding, Trace.messageType.error);
			}

			newValue = expressionValue;
		}

		this.updateSource(newValue);
	}

	private _getExpressionValue(expression: string, isBackConvert: boolean, changedModel: any): any {
		let result: any = null;