JSON/JavaScript Function Issue

Question

I've been working on a function for a web page that should display information from a JSON object depending upon two attributes, the attendance day and start time. The JSON and function are as follows is as follows:

var courses = [{
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "8:00",
  "End_Time": "9:30",
  "Attendance": "Monday"
}, {
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "10:30",
  "End_Time": "11:30",
  "Attendance": "Monday"
}, {
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "12:30",
  "End_Time": "1:30",
  "Attendance": "Wednesday"
}];

function plotCourse() {
  var i;
  for (i = 0; i < courses.length; i++) {
    var course = courses[i];
    console.log(course);
    if (course.Attendance == "Monday" && course.Start_Time == "10:30") {
      alert(course.Attendance);
      alert(course.Start_Time);
    }
  }
}

I'm using alert() for testing purposes. However, I don't seem to get a returned value, and I'm a bit stumped and what may be going on.

Thanks in advance.

this is just a hunch, and I may be wrong, but in your example you don't actually call the plotCourse() function. You just define it. — amenthes
– amenthes, Commented Nov 28, 2016 at 0:39

RizkiDPrast · Accepted Answer · 2016-11-28 00:49:28Z

2

you forget to call it: plotCourse();, or use IIFE instead. please check this one

var courses = [{
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "8:00",
  "End_Time": "9:30",
  "Attendance": "Monday"
}, {
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "10:30",
  "End_Time": "11:30",
  "Attendance": "Monday"
}, {
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "12:30",
  "End_Time": "1:30",
  "Attendance": "Wednesday"
}];

(function() {
  var i;
  for (i = 0; i < courses.length; i++) {
    var course = courses[i];
    console.log(course);
    if (course.Attendance == "Monday" && course.Start_Time == "10:30") {
      alert(course.Attendance);
      alert(course.Start_Time);
    }
  }
})(); /* IIFE*/

edited Nov 28, 2016 at 0:49

answered Nov 28, 2016 at 0:40

RizkiDPrast

1,7251 gold badge15 silver badges22 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Ajay Narain Mathur · Accepted Answer · 2016-11-28 00:39:19Z

Hope you were calling the function.

Working here:

var courses = [{
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "8:00",
  "End_Time": "9:30",
  "Attendance": "Monday"
}, {
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "10:30",
  "End_Time": "11:30",
  "Attendance": "Monday"
}, {
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "12:30",
  "End_Time": "1:30",
  "Attendance": "Wednesday"
}];

function plotCourse() {
  var i;
  for (i = 0; i < courses.length; i++) {
    var course = courses[i];
    console.log(course);
    if (course.Attendance == "Monday" && course.Start_Time == "10:30") {
      console.log(course.Attendance);
      console.log(course.Start_Time);
    }
  }
}
plotCourse(); //Involed the function

Rohìt Jíndal · Accepted Answer · 2016-11-28 06:47:03Z

You forgot to call the plotCourse() function.

var courses = [{
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "8:00",
  "End_Time": "9:30",
  "Attendance": "Monday"
}, {
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "10:30",
  "End_Time": "11:30",
  "Attendance": "Monday"
}, {
  "dept": "CSC",
  "id": "3380",
  "instructor": "Douglas",
  "Location": "012 Lockett",
  "Start_Time": "12:30",
  "End_Time": "1:30",
  "Attendance": "Wednesday"
}];

function plotCourse() {
  var i;
  for (i = 0; i < courses.length; i++) {
    var course = courses[i];
    console.log(course);
    if (course.Attendance == "Monday" && course.Start_Time == "10:30") {
      alert(course.Attendance);
      alert(course.Start_Time);
    }
  }
}

plotCourse();

Pinguto · Accepted Answer · 2016-11-28 00:49:50Z

0

the example you proposed was not the called function. iniltre I made a small correction to the FOR loop.. =)

function plotCourse() {
  for (var i = 0; courses[i]; i++) { // Control if the element exists
    var course = courses[i];
    console.log(course);
    if (course.Attendance == "Monday" && course.Start_Time == "10:30") {
      alert(course.Attendance);
      alert(course.Start_Time);
    }
  }
}

plotCourse(); // launch the function!

answered Nov 28, 2016 at 0:49

Pinguto

4364 silver badges19 bronze badges

Comments

Bojan Ivanac · Accepted Answer · 2016-11-28 01:03:49Z

0

As others have already stated, you need to call the function. It's working for me when I call it.

answered Nov 28, 2016 at 1:03

Bojan Ivanac

1,1708 silver badges17 bronze badges

Collectives™ on Stack Overflow

JSON/JavaScript Function Issue

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related