avoid onkeyup event on hitting enter key

[gatsby]

I have form which contains a text field and a submit button.
func_1() is called onsubmit event of the form and func_2() is called onkeyup event of text field.My problem is that func_2() is also called onkeyup event of enter key, I want to avoid calling func_2() on hiting enter key. Is there any better and easier way to do it?? plz suggest me

[Rabbit]

Use the event.keycode or event.which to get which key was pressed, it they pressed the enter key, don't run the rest of the code.

[gatsby]

function func_2(str)
{
 
  $(document).ready(function() {
  $('input[type=text]').on('keyup', function(e) {
  if(e.which == 13) {
   var check=fal;
  }
  })
  });
 
if(check==fal){
    func_1();
}else
{
 
var xmlhttp;
if (str.length==0)
  { 
  document.getElementById("mydiv").innerHTML="";
  return;
  }
if (window.XMLHttpRequest)
  {
  xmlhttp=new XMLHttpRequest();
  }
else
  {
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("mydiv").innerHTML=xmlhttp.responseText;
    }
  }
xmlhttp.open("GET","target.php?q="+str,true);
xmlhttp.send();
}
}

this is code for above question. where is mistake here?? and how to fix it?

[Rabbit]

Aren't you already calling a function on key up? Why are you creating another one? And besides, you can't reference a local variable outside of its function scope.