use Liveupdate="validateFunction" param for Input View
validateFunction : function(oEvent) {
var ovalid=oEvent.oSource;
var newValue = oEvent.getParameter("value");
if(isNaN(newValue)){
ovalid.setValueState(sap.ui.core.ValueState.Error);
ovalid.setValue("");
return false;
}
else
{
ovalid.setValueState(sap.ui.core.ValueState.None);
}
}
Good blog for SAP
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