Value of a select in SAPUI5 - sapui5

Question

I have the following select in a table in my xml view.
Table:
<Table id="variables"
rows="{
path: 'modelname>/ZDATSet'
}">
...
Select:
<m:Select
selectedKey="{modelname>Datetype}"
items="{
path: 'modelname>/ZTYPESet'
}">
<core:Item key="{modelname>Datetype}" text="modelname>Datetypetxt}" />
</m:Select>
Furthermore I have a button in an other row in the table.
In the press-function I want to read the currently selected key of the select-box.
If I try it with
var button = oEvent.getSource();
var context = button.getBindingContext("modelname");
var datetype = context.getProperty("Datetype");
I only get the preselected value but not the change from the user input.
(Same problem with an text input in the row)
I already put data-sap-ui-xx-bindingSyntax="complex" in the index.html

Answer 1

I found the solution now.
I thought <script src="https://sapui5.hana.ondemand.com/resources/sap-ui-core.js"
data-sap-ui-xx-bindingSyntax="complex" ... should be enough for the default two way binding.
Now I added oModel.setDefaultBindingMode(sap.ui.model.BindingMode.TwoWay); to the model and it works fine.

Answer 2

If your button is in the same row you could do something like this in its press event:
onPress:function(oEvent){
var button = oEvent.getSource();
var context = button.getBindingContext("modelname"); //Points to the current row
var datetype = context.getProperty("DateType");
...
}
If the button is outside of the table you have to give us more details: Which Table are you using and how is it configured, do you want to read the value of the selectbox in the currently selected row? Add more code!

Answer 3

Based on your code snippet, you are using model binding to set the items and the selected key of your Select.
In the Button press handler you can get the current value from the binding context:
onPress: function (oEvent) {
oEvent.getSource().getBindingContext("modelname").getProperty("Datetype");
}

Answer 4

Here once you set the selectedKey property in SelectionInputType.COMBOBOX, you can take value as below.
oController = this; var view = oController.getView(); var oModel = view.getModel(); var data = oModel.getData();