JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="txt1" name="type_name" value="Value1-">

JavaScript

$('#txt1').on('keyup',function(){
    
    var str=$(this).val();
    var newstr = str.substring(0, 7);
   
    if(newstr != "Value1-")
    {    // alert($(this).val());
        //$(this).val("");
       // alert($(this).val());
        $(this).val("Value1-");
    }  
    
});