从另一个 function 调用 function 时获取未定义的变量

Question

Scratching my head. I'm getting an undefined error when trying to call a function. Thing is, when I print to the console I can see the data being passed clearly.

Uncaught TypeError: convos is undefined

function1

function fetchConversation(userID){

//loop through 
usersms.forEach(function (sms,counter) {

//get userid from  iteration
var userid_loop = sms.details[0].user.id;

//only display convo from specific user
if(userid_loop === userID){

//get all messages from this one user
var conversation = sms.details;

//transfer conversation to next function to display
showConversation(conversation);
//
}
//
});
}

function2

function showConversation(myconvo){
        
var convos = myconvo;
        
//iterate and append conversion
convos.forEach(function (msg,counter) {
        
console.log(msg.message);//prints all messages in the log
        
});
}
showConversation()//Uncaught TypeError: convos is undefined

Answer 1

I believe that you need to enter something within the brackets of showConversation().

You are assigning convos to myconvo, but myconvo doesn't exist because you didn't enter it as a parameter (value in the brackets).

Answer 2

Your first error is that you are not passing in any arguments to the function.

Your second error is that msg.message doesn't exist - it's just msg by itself.

Also, the counter is unnecessary in this case.

 function showConversation(myconvo) { var convos = myconvo; //iterate and append conversion convos.forEach(function(msg) { console.log(msg); //prints all messages in the log }); } showConversation(["element1", "element2"])

You also have an error here:

function fetchConversation(userID){

//loop through
usersms.forEach(function (sms,counter) {

//get userid from  iteration
var userid_loop = sms.details[0].user.id;

//only display convo from specific user
if(userid_loop === userID){

//get all messages from this one user
var conversation = sms.details; //actually gets the details of the element it is iterating through, not all of them

//transfer conversation to next function to display
showConversation(conversation); //sends the details one by one for each iteration
//
}
//
});
}

Fix:

function fetchConversation(userID){
var conversation=[]
//loop through
usersms.forEach(function (sms,counter) {

//get userid from  iteration
var userid_loop = sms.details[0].user.id;

//only display convo from specific user
if(userid_loop === userID){

//get all messages from this one user
conversation.push(sms.details);
}
});
//transfer conversation to next function to display
showConversation(conversation);
}