title: Parse a Json response array from server in javascript without loading the page
body: <p>I am working on a webapp. I have a webpage that sends some data to the server via form tag. The server returns a json array. I want to know how to parse that json array without loading 
  my page. The purpose is to keep my webpage as it is and load some values from json array to
  some text fields below my form tag for further processing.</p>
  
  <p>edit: I have tried some examples for reading from json array but how to prevent webpage realoading.</p>