Assigning result from a function callback inside for-loop, loop end and the object does not contain the...












0
















This question already has an answer here:




  • Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference

    6 answers



  • How do I return the response from an asynchronous call?

    33 answers




Im having a trouble assigning a value to a object does not contain the value. I have a module that handle database query then I call it in side a for-loop.



  socket.on('get_mail',function(data){

      var obj = JSON.parse(data);

      var mail = {inbox:};



     for(var i = 0; i < obj.contacts.length; i++){

         var params = {user1: obj.user, user2: obj.contacts[i].username};

         var conversation = {username: obj.contacts[i].username, message:};



        dbHandler.GetMessage(params, function(result){

        conversation.message = result;

      });



      mail.inbox.push(conversation);

    }

    console.log(mail);

 });


DBHandler.js



exports.GetMessage = function(data, callback){

var sql = `Call GetMessage(?, ?)`;

var result = ;



connection.query(sql, [data.user1, data.user2], function(error, results, fields){

  if(error){

    console.log(error.message);

  }

  if(results.length){

    for(var i = 0; i < results[0].length; i++){

      var message = {

        mail_id: results[0][i].mail_id,

        message_content: results[0][i].message_content,

        sender: results[0][i].sender,

        reciever: results[0][i].receiver,

        mail_sent_date: results[0][i].mail_sent_date,

      };

      result.push(message);

    }

    return callback(result);

  }

  else{

    console.log("No results found!")

  }

});


};






javascript node.js socket.io







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marked as duplicate by CertainPerformance javascript
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 Nov 22 '18 at 6:13


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.



















  • Use Promise.all on the contacts mapped to Promises instead

    – CertainPerformance
    Nov 22 '18 at 6:13











  • where to use promise.all in the code?

    – Adrian Manuel Cleofe
    Nov 22 '18 at 6:30
















0
















This question already has an answer here:




  • Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference

    6 answers



  • How do I return the response from an asynchronous call?

    33 answers




Im having a trouble assigning a value to a object does not contain the value. I have a module that handle database query then I call it in side a for-loop.



  socket.on('get_mail',function(data){

      var obj = JSON.parse(data);

      var mail = {inbox:};



     for(var i = 0; i < obj.contacts.length; i++){

         var params = {user1: obj.user, user2: obj.contacts[i].username};

         var conversation = {username: obj.contacts[i].username, message:};



        dbHandler.GetMessage(params, function(result){

        conversation.message = result;

      });



      mail.inbox.push(conversation);

    }

    console.log(mail);

 });


DBHandler.js



exports.GetMessage = function(data, callback){

var sql = `Call GetMessage(?, ?)`;

var result = ;



connection.query(sql, [data.user1, data.user2], function(error, results, fields){

  if(error){

    console.log(error.message);

  }

  if(results.length){

    for(var i = 0; i < results[0].length; i++){

      var message = {

        mail_id: results[0][i].mail_id,

        message_content: results[0][i].message_content,

        sender: results[0][i].sender,

        reciever: results[0][i].receiver,

        mail_sent_date: results[0][i].mail_sent_date,

      };

      result.push(message);

    }

    return callback(result);

  }

  else{

    console.log("No results found!")

  }

});


};






javascript node.js socket.io







share|improve this question















marked as duplicate by CertainPerformance javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

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 Nov 22 '18 at 6:13


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.



















  • Use Promise.all on the contacts mapped to Promises instead

    – CertainPerformance
    Nov 22 '18 at 6:13











  • where to use promise.all in the code?

    – Adrian Manuel Cleofe
    Nov 22 '18 at 6:30














0












0








0









This question already has an answer here:




  • Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference

    6 answers



  • How do I return the response from an asynchronous call?

    33 answers




Im having a trouble assigning a value to a object does not contain the value. I have a module that handle database query then I call it in side a for-loop.



  socket.on('get_mail',function(data){

      var obj = JSON.parse(data);

      var mail = {inbox:};



     for(var i = 0; i < obj.contacts.length; i++){

         var params = {user1: obj.user, user2: obj.contacts[i].username};

         var conversation = {username: obj.contacts[i].username, message:};



        dbHandler.GetMessage(params, function(result){

        conversation.message = result;

      });



      mail.inbox.push(conversation);

    }

    console.log(mail);

 });


DBHandler.js



exports.GetMessage = function(data, callback){

var sql = `Call GetMessage(?, ?)`;

var result = ;



connection.query(sql, [data.user1, data.user2], function(error, results, fields){

  if(error){

    console.log(error.message);

  }

  if(results.length){

    for(var i = 0; i < results[0].length; i++){

      var message = {

        mail_id: results[0][i].mail_id,

        message_content: results[0][i].message_content,

        sender: results[0][i].sender,

        reciever: results[0][i].receiver,

        mail_sent_date: results[0][i].mail_sent_date,

      };

      result.push(message);

    }

    return callback(result);

  }

  else{

    console.log("No results found!")

  }

});


};






javascript node.js socket.io







share|improve this question

















This question already has an answer here:




  • Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference

    6 answers



  • How do I return the response from an asynchronous call?

    33 answers




Im having a trouble assigning a value to a object does not contain the value. I have a module that handle database query then I call it in side a for-loop.



  socket.on('get_mail',function(data){

      var obj = JSON.parse(data);

      var mail = {inbox:};



     for(var i = 0; i < obj.contacts.length; i++){

         var params = {user1: obj.user, user2: obj.contacts[i].username};

         var conversation = {username: obj.contacts[i].username, message:};



        dbHandler.GetMessage(params, function(result){

        conversation.message = result;

      });



      mail.inbox.push(conversation);

    }

    console.log(mail);

 });


DBHandler.js



exports.GetMessage = function(data, callback){

var sql = `Call GetMessage(?, ?)`;

var result = ;



connection.query(sql, [data.user1, data.user2], function(error, results, fields){

  if(error){

    console.log(error.message);

  }

  if(results.length){

    for(var i = 0; i < results[0].length; i++){

      var message = {

        mail_id: results[0][i].mail_id,

        message_content: results[0][i].message_content,

        sender: results[0][i].sender,

        reciever: results[0][i].receiver,

        mail_sent_date: results[0][i].mail_sent_date,

      };

      result.push(message);

    }

    return callback(result);

  }

  else{

    console.log("No results found!")

  }

});


};





This question already has an answer here:




  • Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference

    6 answers



  • How do I return the response from an asynchronous call?

    33 answers







javascript node.js socket.io




javascript node.js socket.io






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 22 '18 at 6:32







Adrian Manuel Cleofe

















asked Nov 22 '18 at 6:12









Adrian Manuel CleofeAdrian Manuel Cleofe

188




188




marked as duplicate by CertainPerformance javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

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 Nov 22 '18 at 6:13


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.









marked as duplicate by CertainPerformance javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

StackExchange.ready(function() {
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function() {
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});
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 Nov 22 '18 at 6:13


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.















  • Use Promise.all on the contacts mapped to Promises instead

    – CertainPerformance
    Nov 22 '18 at 6:13











  • where to use promise.all in the code?

    – Adrian Manuel Cleofe
    Nov 22 '18 at 6:30



















  • Use Promise.all on the contacts mapped to Promises instead

    – CertainPerformance
    Nov 22 '18 at 6:13











  • where to use promise.all in the code?

    – Adrian Manuel Cleofe
    Nov 22 '18 at 6:30

















Use Promise.all on the contacts mapped to Promises instead

– CertainPerformance
Nov 22 '18 at 6:13





Use Promise.all on the contacts mapped to Promises instead

– CertainPerformance
Nov 22 '18 at 6:13













where to use promise.all in the code?

– Adrian Manuel Cleofe
Nov 22 '18 at 6:30





where to use promise.all in the code?

– Adrian Manuel Cleofe
Nov 22 '18 at 6:30












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