title: How to post extjs data from form to server?
body: <p>I have understood how to GET data from server to application.
  Now I face with POST task.
  I have form, and want post fields data to server by clicking on button.</p>
  
  <p>I trying to use this:</p>
  
  <pre><code>{//some controllercode
  
            xtype: 'button'  
            text: 'save',
            ui: 'confirm',
            scope: this,
            handler: function() {
                Ext.Ajax.request({
                    url:'/api/renter/',
                    method: 'POST',
                    params: {
                        ReplaceAllRefs: true
                    }
                })
  
                }
            }
  </code></pre>
  
  <p>what the parameter of Ext.Ajax defines data which will post to server through url?
  I can use this class for POST task or isn't the best way?</p>