freedom ui cancel HandleViewModelAttributeChangeRequest

Hi Harvey,

 

We can create an attribute to store a value that you want to set in HandleViewModelInitRequest. Then, in HandleViewModelAttributeChangeRequest, we can check if the current field value matches the one you previously set. If it does not match, we can assign the stored value to it. This way, we ensure that the desired value is assigned to the field.



In the given example, we have created an attribute named "UsrInitialValue".

viewModelConfig: /**SCHEMA_VIEW_MODEL_CONFIG*/{
			"attributes": {
				"StringAttribute_ljc6yh6": {
					"modelConfig": {
						"path": "PDS.UsrTestString"
					}
				},
				"UsrInitialValue": {}
			}
		}/**SCHEMA_VIEW_MODEL_CONFIG*/,

This attribute is used to store a specific value that we set during the initialization process. In the crt.HandleViewModelInitRequest handler, we set a value for the request.$context.UsrInitialValue. And in crt.HandleViewModelAttributeChangeRequest, we check if the current field value matches the value we set previously in the request.$context.UsrInitialValue. If they don't match, we update the field with the new value.

 

handlers: /**SCHEMA_HANDLERS*/[
			{
				request: "crt.HandleViewModelInitRequest",
				handler: async (request, next) => {
					request.$context.UsrInitialValue = "testInit";
					request.$context.StringAttribute_ljc6yh6 = await request.$context.UsrInitialValue;
					return next?.handle(request);
				}
			},
 
			{
				request: "crt.HandleViewModelAttributeChangeRequest",
				handler: async (request, next) => {
					var srtValue = await request.$context.StringAttribute_ljc6yh6;
					var initVal = await request.$context.UsrInitialValue;
					if (request.attributeName === 'StringAttribute_ljc6yh6' && srtValue != initVal) {
						request.$context.StringAttribute_ljc6yh6 = initVal;
					}
					return next?.handle(request);
				}
			}
		]/**SCHEMA_HANDLERS*/,