I could not perform the output of the value written to the input at the bottom

I want to see the input in a project and get the output at the same time. They did this only in the so-called way. But I want the output of my buttonless post. how to do?

<input type="text" id="myText">
<button type="button" onclick="myFunction()">Try it</button>
<p id="demo"></p>

  
<script>
  
// Here the value is stored in new variable x 
function myFunction() {
    var x = document.getElementById("myText").value;
    document.getElementById("demo").innerHTML = x;
}
</script>

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