Hi Inzitari,
Thank you for using Syncfusion products.
We have checked your provided code example, we suggest you to use ej2_instances[0] to get the instance of the NumericTextBox to resolve the problem. Please check the below code example and sample link,
[JS]
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function changeFormat() {
var currency = document.getElementById("currency").ej2_instances[0];
currency.format = "c6";
}
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Please try the above details and get back to us if you need further assistance.
Regards,
Shanmugaraja K