[Rails] Form Ajax in Rails ?

[Le Hung]

I'm new in Rails.

I'm trying to add a form with ajax.It's just typing a text and submit to
file 'ex/act' and show the param in form.

My code:

 <script>
    function loadDoc(url, cfunc) {
      var xhttp;
      xhttp=new XMLHttpRequest();
      xhttp.onreadystatechange = function() {
        if (xhttp.readyState == 4 && xhttp.status == 200) {
          cfunc(xhttp);
        }
      };
      xhttp.open("POST", url, true);
      xhttp.send();
    }
    function myFunction(xhttp) {
      document.getElementById("demo").innerHTML = xhttp.responseText;
    }
</script>

And the form:

<%= form_for :ex,url:ex_act_path,remote:true do |f|%>
    <%= f.text_field :text%>
    <button onclick="loadDoc('ex/act',myFunction)">abc</button>
<%end%>

In the 'ex/act' controller:

def act
    @a = get_param
end
private
 def get_param
    params.require(:ex).permit(:text)
 end

In the Console of browser:

POST http://localhost:3000/ex/act 422 Unprocessable Entity
GET http://localhost:3000/ex/act 200 OK

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