ExtJS : Ajax asynchronous vs synchronous request

Ajax is used for get data to client side. It’s special helpful in case get data at runtime.

The structure:

Ext.Ajax.request({
    url: '/controller/GetData',
    params: {
        id: 1
    },
    timeout: 30000,
    method: GET or POST,
    async: isAsync // Synchronous or Asynchronous
    success: function(response){
        var text = response.responseText;
        var result = Ext.JSON.decode(text);
        // do something here .....
    },
    failure : function(response){
       // do something when wrong ....
   },
})