how to push data into seperate json model folder in sapui5 onsubmitting button - sapui5

Question

View1.view.xml
<mvc:View controllerName="Register.controller.View1" xmlns:l="sap.ui.layout" xmlns:f="sap.ui.layout.form" xmlns:core="sap.ui.core" xmlns:html="http://www.w3.org/1999/xhtml" xmlns:mvc="sap.ui.core.mvc" xmlns="sap.m">
<App>
<pages>
<Page title="{i18n>title}">
<content>
<f:SimpleForm>
<f:content>
<Label text="FirstName" />
<Input value="" id="a1" width="50%" />
<Label text="LastName" />
<Input value="" id="a2" width="50%" />
<Label text="username" />
<Input value="" id="a3" width="50%" />
<Label text="Password" />
<Input value="" id="a4" width="50%" />
</f:content>
</f:SimpleForm>
<Button id="btn1" type="Accept" text="Submit" press="onPress" />
</content>
</Page>
</pages>
</App>
</mvc:View>
Controller
sap.ui.define([
"sap/ui/core/mvc/Controller",
"sap/ui/model/json/JSONModel"
], function(Controller, JSONModel) {
"use strict";
var sValue, data, oModel, selectedVal, textAreaVal;
return Controller.extend("Register.controller.View1", {
onPress: function() {
//get the value of the selected item in the combobox
selectedVal = this.getView().byId("a3").getValue();
//get the textarea value
textAreaVal = this.getView().byId("a4").getValue();
var oModel = new JSONModel(jQuery.sap.getModulePath("Register", "model/model1.json"));
this.getView().setModel(oModel);
oModel.data.push({ selectedVal: selectedVal, textAreaVal: textAreaVal });
}
});
});
I have created this but getting push is not a function

Answer 1

You are setting the data incorrectly. There is no data array inside oModel, it is an object (push is for array's)
You should set the data using the model's setData method instead:
oModel.setData({ selectedVal: selectedVal, textAreaVal: textAreaVal });
Updated answer
I understand you want to update an array inside your model. In that case, first retrieve the array from the model, then push the new object, and then finally store the updated array back into your model:
var oModel = this.getView().getModel();
var aData = oModel.getProperty("/data");
aData.push({ selectedVal: selectedVal, textAreaVal: textAreaVal });
oModel.setProperty("/data", aData);
See this working example: https://jsbin.com/kosaji/edit?html,output