JSFiddle - React, Tailwind, and code Playground
by Shree Khanal
HTML
<input type='text' class='divMailUserPopUp' id='txtUsername'/>
JavaScript
$('.divMailUserPopUp').on("keyup", function(event) {
var value = $(this).val();
if (value.indexOf('@') != -1) {
$(this).val(value.replace(/\@/g, ""));
}
})