How to pass value from one interface to another interface ?

I am sorry but my ask is, I have a form on Interface-1 and it has been embedded in Interface-2, I can see the Interface-1 form on Interface-2. Now I am trying to submit data from Interface-2 in embedded form of Interface-1 and expecting when I press submit the data should be written in DB.

I am sorry but my ask is, I have a form on Interface-1 and it has been embedded in Interface-2, I can see the Interface-1 form on Interface-2. Now I am trying to submit data from Interface-2 in embedded form of Interface-1 and expecting when I press submit the data should be written in DB.

You will likely need to map the rule inputs together from the child interface to the parent. For example, suppose you have a rule input for ri!case on the child interface. You will need to create a second rule input to match that on the parent interface and map them together like this:

rule!ChildInterface(case: ri!case)

Then, any changes you make in the child interface will also be saved to the parent.

If this still does not address your question, can you post samples of the two interfaces you have? That can help us understand your scenario and provide the best solution.

Here is Interface-2 SAIL :

a!columnsLayout(
  columns: {
    a!columnLayout(
      contents: {
        a!paragraphField(
          label: "",
          labelPosition: if(ri!readOnly, "ADJACENT", "ABOVE"),
          value: ri!notes.notesMessage,
          saveInto: ri!notes.notesMessage,
          height: "MEDIUM",
          validations: if(
            len(ri!notes.notesMessage) > 2000,
            "Value may not be longer than 2000 characters. You have entered " & len(ri!notes.notesMessage) & " characters.",
            null
          )
        ),
        a!buttonArrayLayout(
          buttons: {
            a!buttonWidget(
              label: "Submit",
              icon: "check",
              saveInto: {
                a!save(
                  target: ri!notes,
                  value: append(
                    'type!{urn:com:appian:types}Notes'(
                      date: now(),
                      createdBy: loggedInUser(),
                      notesMessageBody: ri!notes.notesMessage
                    )
                  )
                )
              },
              submit: true
            )
          },
          align: "END"
        )
      }
    )
  }
)

Interface-1 SAIL:

{
  a!columnsLayout(
    columns: {
      a!columnLayout(
        contents: {
          a!textField(
            label: "INTERFACE - 1",
            labelPosition: "ABOVE",
            saveInto: {},
            refreshAfter: "UNFOCUS",
            required: false,
            readOnly: true,
            disabled: false,
            validations: {}
          ),
          a!paragraphField(
            label: "Interface-1 Content Here...",
            labelPosition: "ABOVE",
            saveInto: {},
            refreshAfter: "UNFOCUS",
            height: "MEDIUM",
            readOnly: true,
            disabled: true,
            validations: {}
          )
        }
      ),
      a!columnLayout(
        contents: {
          a!textField(
            label: "INTERFACE - 2",
            labelPosition: "ABOVE",
            saveInto: {},
            refreshAfter: "UNFOCUS",
            readOnly: true,
            disabled: false,
            validations: {}
          ),
          rule!notes(
            null,null,null
          )
        }
      )
    }
  )
}

I am trying this way :

rule!notes(
      notes: 'type!{urn:com:appian:types}Notes'(
        date: now(),
        createdBy: loggedInUser(),
        notesMessage: "Sample Input"
      ),
      cancel: ri!cancel,
      readOnly: ri!readOnly
    )

But it doesn't seem to be working.

Edit:

Also, when I move out of paragpaph and press on submit button, text in the paragraph disapears. 

Shamim,

With that approach, you're creating an instance of the Notes CDT and not actually creating a variable in your interface to hold that data for you.

You'll need to associate your notes parameter to an actual variable: a rule input or a local variable.

I tried it with rule input as well, but no luck.

rule!notes(
      notes: ri!mNotes,
      cancel: ri!cancel,
      readOnly: ri!readOnly
    )

Can you elaborate on what isn't working? Is it throwing an error, or is it not saving the data, etc? Also, FWIW I don't believe your button is configured correctly in interface 2 - you have an append() function, but you have only provided one parameter to it. The append requires both the array you'd like to append to and the value to append.

I would also recommend against using a submit button in a child interface. Usually it's good practice to have your buttons at the top level interface, since then you can set up saving behavior from any part of the interface (or child interfaces). Plus, it will make the form look better to have the buttons at the top level.