JavaScript CSV Export with Unicode Symbols

There are often problems exporting unicode symbols to CSV file format. Developers tend to forget to add the UTF-8 BOM at the start of text and text is displayed incorrectly when opened in Excel application. Therefore I add a small example of such an export which might be useful for developers who have come to that problem too.

<script text="text/javascript">

function createExportHeader(dataSource, separator) {
	var headerRow = "",
		columns = dataSource.columns,
        newLine = "\r\n";
		
	for (var i=0; i < columns.length; i++) {
		headerRow += (i > 0 ? separator : '') + columns[i].displayName;
	}
	return headerRow + newLine;
}
		
function createExportRows(dataSource, separator) {
	var content = "",
		columns = dataSource.columns,
		data = dataSource.data,
        newLine = "\r\n",
        dataField;

	for(var j=0; j < data.length; j++) {
		for (var i=0; i < columns.length; i++) {
			dataField = columns[i].dataField;
			content += (i > 0 ? separator : '') + data[j][dataField];
		}
		content += newLine;
	}
	return content;
}

function excelExport() {
	var separator = ',',
		dataSource = {
			data: [
				{
					name: "Frank Über",
					age: 49
				},
				{
					name: "Toni Köhl",
					age: 56
				}
			],
			columns: [
				{
					dataField: "name",
					displayName: "Name"
				},
				{
					dataField: "age",
					displayName: "Alter"
				}
			]
		};
	var content = createExportHeader(dataSource, separator);
	content += createExportRows(dataSource, separator);
	
    //an anchor html element on the page (or create dynamically one)
    //to use its download attribute to set filename
	var a = document.getElementById('csv');  
	a.textContent='download';
	a.download="MyFile.csv";
	a.href='data:text/csv;charset=utf-8,%EF%BB%BF'+encodeURIComponent(content);
	a.click();
}

</script>