JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML>
<script src="https://sapui5.netweaver.ondemand.com/resources/sap-ui-core.js"
				id="sap-ui-bootstrap"
				data-sap-ui-libs="sap.m,sap.ui.commons"
				data-sap-ui-theme="sap_bluecrystal">
		</script>

		<!-- add sap.ui.table,sap.ui.ux3 and/or other libraries to 'data-sap-ui-libs' if required -->

		<script>
				sap.ui.localResources("learning");
				var view = sap.ui.view({id:"idfirst1", viewName:"learning.first", type:sap.ui.core.mvc.ViewType.JS});
				view.placeAt("content");
		</script>

	</head>
	<body class="sapUiBody" role="application">
		<div id="content"></div>
	</body>
</html>

JavaScript

var oComboBox1 = new sap.ui.commons.ComboBox("ComboBox1");
		oComboBox1.setTooltip("Country");
		oComboBox1.setEditable(true);
		oComboBox1.setValue("Deutschland");
		oComboBox1.setWidth("200px");
		var oItem = new sap.ui.core.ListItem("Country1");
		oItem.setText("Canada");
		oComboBox1.addItem(oItem);
		oItem = new sap.ui.core.ListItem("Country2");
		oItem.setText("Deutschland");
		oComboBox1.addItem(oItem);
		oItem = new sap.ui.core.ListItem("Country3");
		oItem.setText("England");
		oComboBox1.addItem(oItem);
		oItem = new sap.ui.core.ListItem("Country4");
		oItem.setText("Россия");
		oComboBox1.addItem(oItem);
		
		var otext = new sap.ui.commons.TextField({
			placeholder:"Hi",
			change:function(){
				sap.ui.getCore().byId("ComboBox1").setEditable(false);
			},
		});


var olayout = new sap.ui.commons.layout.MatrixLayout({

});
olayout.createRow(otext,oComboBox1);
		
olayout.placeAt("content");