如何处理流星呼叫内或呼叫后的事件？

Question

我遇到了两种情况内部流星调用获取结果并添加数据但 querySelector 抛出错误并且外部从调用获取结果但它在流星调用之前执行从而使结果状态为空任何解决方案？ --- 流星 1.8 反应 16.8

        onSubmit(e) {
            e.preventDefault();
            Meteor.call('Add data', name,surname,
                adharcard,addess,Mnumber,tags,product,
                (error, result) => {
                    if(error){
                        console.log("Add data error ", error);
                    } else {
                      console.log("Add data res ", result);
                      this.setState({kUserrId:result});
             //below line gives me error
    //TypeError: Cannot read property 'querySelector' of null      
   console.log("fileupload24e",e.target.querySelector('#fileinput').files[0]);
//add result to db
                    }
                });

     // -------or--------- 
//wait for meteor call to complete and some how get result from meteor call    
          console.log("fileupload24e",e.target.querySelector('#fileinput').files[0]); // this work
    // now add data result to db
    console.log('kUserrId',this.state.kUserrId);// null
                }

Answer 1

您需要使用 event.persist() 来使回调中调用的事件不为 null 或 undefined。

onSubmit(e) {
  e.persist();
  e.preventDefault();

  Meteor.call('Add data', name,surname,
    adharcard,addess,Mnumber,tags,product,
    (error, result) => {
      if(error){
        console.log("Add data error ", error);
      } else {
        console.log("Add data res ", result);
        this.setState({ kUserrId:result });

        console.log("fileupload24e", e.target.querySelector('#fileinput').files[0]);
      }
    }
  );
}

如何处理流星呼叫内或呼叫后的事件？

How to handle event inside meteor call or after call?

javascript

meteor

reactjs