CODEWITHSUNDEEP
extjssencha-touchsencha-touch-2jsonp
Harikrishnan
Harikrishnan

Reputation: 9979

JSONP request issue

Recently I have replaced xmlHTTPRequest with a JSONP request for my web service calls, but I found that I'm getting errors due to it. I could see that JSONP is a little slower.

initialize:function(){
  this.callParent();
  var jsonObject = Ext.create('MyProj.library.webservice').makeJSONPRequest('top_categories_json');
  Ext.getCmp('categoryList').setData(jsonObject.info);
  console.log(jsonObject.info);
}
makeJSONPRequest: function(urlx, postparams) {
  Ext.data.JsonP.request({
    params:{
      params:  Ext.JSON.encode(postparams)
    },
    success: function(result) {
      console.log('JSON RES');
      console.log(result.info);
      if (result) {
        //return JSON.parse(result);
        return result;
      } else {
        Ext.Msg.alert('Error', 'There was an error retrieving the weather.');
      }
    }
  });
}

I could see that after executing the makeJSONPRequest call, it executes the next stateemnt without waiting for the JSONP request to finish, so jsonObject becomes undefined. After that error the JSONP request finishes and prints the value. Anyway to suspend the main thread until the JSONP request finishes.

Upvotes: 0

Views: 650

Answers (1)

sha
sha

Reputation: 17850

No. Calls to your service are async. You really need to put all logic in the callback handler. Or generates an event after you receive a response and handle that event.

Upvotes: 1

Related Questions