Formatter function not working properly inside Input Control - sapui5

Question

I need to highlight a few of the table's cell border colors on the basis of a condition and pre-fill it with some negative value. Then I need to SAVE/POST this value to proceed further.
View.xml
<t:Column width="100px">
<Label text="ActualQty"/>
<t:template>
<Input id="idInput" value="{ parts: [ {path: 'viewData>ACT_QTY'}, {path: 'viewData>MTART'} ], formatter: '._formatter.defaultInput' }">
<customData>
<core:CustomData key="colorclass" value="{path: 'viewData>MTART', formatter: '._formatter.formatCell'}" writeToDom="true"/>
</customData>
</Input>
</t:template>
</t:Column>
Formatter.js
formatCell: function (iValue) {
try {
iValue.toString();
} catch (err) {
iValue = "foo";
}
return iValue.toString();
},
defaultInput: function (iValue, iValue1) {
if (iValue !== 0 && iValue1 === "HALB") {
iValue = "-1";
return iValue;
} else {
return iValue;
}
}
style.css
div[data-colorclass="HALB"] {
border: 4px solid #fdf6b1 !important;
}
Highlighting and the default value is appearing. But inside the controller, the input value is not coming.
If I remove parts and pass single input param to formatter function, it's working. But I need both the values to built my logic.
Update
Now I am using Composite Binding to make the binding as Two-way.
View.xml
<Input id="idInput" value="{ parts: [ {path: 'viewData>ACT_QTY'}, {path: 'viewData>MTART'} ], type: '._Compound', formatter: '._formatter.defaultInput' }">
Compound.js
sap.ui.define([
"sap/ui/model/CompositeType",
"dismantling/bom/integration/model/type/Compound"
], CompositeType => CompositeType.extend('Compound', {
constructor: function () {
CompositeType.apply(this, arguments);
this.bParseWithValues = true; // make 'parts' available in parseValue
},
formatValue: iValue => iValue,
parseValue: bValue => bValue,
validateValue: vValue => { /*validate...*/ },
}));
In the controller file, I am passing Compound type as _Compound. I am not getting any errors in the console.
Still, I am not able to get the formatter passed value inside the controller.

Answer 1

Your formatter is correct. Make sure sure that the values are actually accessible under your binding path and that the formatter is accessible to the view. If both these things are ensured, your function will work just fine.