setHandHold(val){this.http.patch('http://localhost:3000/api/simulation/hand-hold?handhold=userinput', {
    })
    .subscribe(data => {
      console.log(data);
    });
    }

<label class="h3-responsive white-text"> Enter Handhold Value: </label>
  <br>
  <div id= "handholds">
  <input type="text" id = "handhold"  value="">
  <script>
    var val = "test";
    document.getElementById("handhold").value = val;
</script>
  <input type="button" class="btn btn-primary btn-sm" value="Submit" (click)= "setHandHold(val)">
  <br>
  </div>