How I can set the value of element of a fragment? - sapui5

Question

This is my fragment,
The fragment not have a controller
<core:FragmentDefinition
xmlns="sap.m"
xmlns:core="sap.ui.core">
<Dialog
title="Invio report via mail">
<content>
<FlexBox
alignItems="Start"
justifyContent="Center">
<items>
<TextArea id="idMailReport" value="themail.mail.it" rows="1" cols="50" />
</items>
</FlexBox>
</content>
<beginButton>
<Button text="Ok" press="onDialogOkButton" />
</beginButton>
<endButton>
<Button text="Close" press="onDialogCloseButton" />
</endButton>
</Dialog>
</core:FragmentDefinition>
Ho I can set che value of TextArea element?
I try to set it from a controller where I call the fragment:
var dialogFrafment = sap.ui.xmlfragment(
"dialogFragment",
"appIntra.fragment.dialog",
this // associate controller with the fragment
);
this.getView().addDependent(dialogFrafment);
dialogFrafment.open();
this.byId("idMailReport").setValue("initial.mail.com");
Can you help me?

Answer 1

please try
sap.ui.getCore().byId("idMailReport").setValue("initial.mail.com");
it should work.
Here is the official document.

Answer 2

I solve it!
var dialogFrafment = sap.ui.xmlfragment(
"appIntra.fragment.dialog",
this.getView().getController() // associate controller with the fragment
);
my problem is that i had set a name of a fragment: "dialogFragment"
Whitout it all work! ;)

Answer 3

A bit outdated, but might be useful for others. When you reuse your fragment inside a view, giving it unique id like:
var dialogFrafment = sap.ui.xmlfragment(
"dialogFragment", // this is fragment's ID
"appIntra.fragment.dialog",
...
);
retrieving id of your nested control goes like:
this.byId(sap.ui.getCore().Fragment().createId("dialogFragment", "idMailReport"));
That way, your prepend fragment's id to your control's id.