Question

我正在尝试在提交表单后将网页重定向到我的主页（使用路线＆＃39; / search＆＃39;）。在我的submit.html文件中，我有一个表单，当按下提交按钮时，表单中的数据将通过＆＃39; / submit＆＃39;提交。发布方法。在我的index.js文件中，我有＆＃39; / submit＆＃39;的get和post功能。这样我就可以访问MongaDB和集合了。以下是功能：

//getting info from the database
router.get('/submit', function(req, res) { //RETURN JSON OF INTINERARIES
   var db = req.db; //Creates a variable called db, which equals the database called db (db holds the collegelist collection)
   var collection = db.get('collegelist'); //Creates a variable called collection which accesses the collection called collegelist
});

router.post('/submit', function(req, res){
  var url = 'mongodb://localhost:27017/maptest'; //IDENTIFIES THE MONGO DB
  //var url = 'mongodb://dbuser2:sillydoo@ds059195.mlab.com:59195/heroku_vmz14q76';

  function insertDocument(db, record, callback) {  //this creates a function to insert data into collegelist
     db.collection('collegelist').insertOne(record,
     function(err, result) {

      assert.equal(err, null); //error must equal null
      console.log("Function for inserting a document.");

      callback(result); //calling back on the result?
    });
  };

  //this grabs the data from the form using ids and assigns it to the parameters in the collegelist database
  req.body['name'] = req.body.name; //INSERTING THE EMAIL INTO THE FIELDS THAT ARE COLLECTED

   //connects to the mongodatabase (the variable url equals the database -- either mongolab or local)
   MongoClient.connect(url, function(err, db) { //MONGO CLIENT IS CONNECTING TO THE URL -- TWO POSSIBLE OUTCOMES: ERROR OR THE DB
    assert.equal(null, err); //ERROR MUST BE NULL FOR THE PROGRAM TO CONTINUE
    insertDocument(db, req.body, function(result) { //this calls on the insert document function I just created
      //RECORD IS CALLED REQ.BODY IN THE LINE ABOVE
        db.close(); //CLOSE CONNECTION WITH THE DB
        console.log("DB Result :", result); //LOGGING IT!
        //ALL THE CODE IN THIS ANNONYMOUS FUNCTION IS THE CALLBACK IN THE INSERTDOCUMENT FUNCTION
        res.send('');
    });
})

res.redirect('/search');
//res.render('search', { username: req.user.givenName });

});

在函数结束时，我尝试调用res.redirect('/search');并返回错误：错误：发送后无法设置标头。在做了研究后，我意识到这个错误正在发生，因为我处于身体或完成状态。但是，我无法弄清楚我需要写什么，而是将页面重定向到我的＆＃39; / search＆＃39;路线或我可以写res.redirect('/search')的地方，以便它不会返回此错误。

非常感谢任何帮助！提前谢谢！

Answer 1

Check this answer，您无法发送多个回复。

此处，如果没有必要，请删除res.send

Answer 2

这是因为您发送了两次回复。一个在

console.log("DB Result :", result); //LOGGING IT!
    //ALL THE CODE IN THIS ANNONYMOUS FUNCTION IS THE CALLBACK IN THE INSERTDOCUMENT FUNCTION
    res.send('');

和一个在底部

res.redirect('/search');

删除res.send，你会没事的。始终确保您只发送一次响应。

Answer 3

将res.send('');回调中的insertDocument替换为res.redirect('/search');。如果您不想等待数据库填充完成而不是仅删除res.send('');

如何使用Node JS重定向？

3 个答案: