JSFiddle - React, Tailwind, and code Playground

HTML

<label id="ctl00_ContentPlaceHolder1_lblMsg" >jhgvjh Text</label>
<br>
<input type="button" id="btn_change" value="hgfhg">

JavaScript

$("#ctl00_ContentPlaceHolder1_lblMsg").on('labelchanged', function () {
       alert('changed!');          
});

$("#btn_change").on('click', function(){
    $("#ctl00_ContentPlaceHolder1_lblMsg").html('New Label Text').trigger('labelchanged');
});

$(window).on('keypress', function(event){
    var keycode = (event.keyCode ? event.keyCode : event.which);
	if(keycode == '13')
        $("#btn_change").trigger('click');
});