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JavaScript

only the last student record is printed out

var students = [
    {
        Name: 'Oskar',
        Track: 'iOS',
        Achievements: 100,
        Points: 1000
    },
    {
        Name: 'Peter',
        Track: 'Android',
        Achievements: 200,
        Points: 2000
    },
    {
        Name: 'Adrian',
        Track: 'Python',
        Achievements: 300,
        Points: 3000
    },
    {
        Name: 'Betty',
        Track: 'C++',
        Achievements: 400,
        Points: 40000
    },
    {
        Name: 'Elaine',
        Track: 'json',
        Achievements: 500,
        Points: 5000
    }
];

var report;
var message;

function print(){
    var outPut = document.getElementById(`output`);
    return outPut.innerHTML = message; 
}

for ( i = 0 ; i < students.length ; i++ ) {

    message = `<h2> Student Name: ${students[i].Name} </h2>`;
    message += `<p>Track: ${students[i].Track}</p>`;
    message += `<p>Achievements: ${students[i].Achievements} </p>`;
    message += `<p>Points: ${students[i].Points} </p>`;
    print(message);

}

can anyone let me know why this is the case

the only difference is I did not add the student = student[i] as demonstrated in the video

I guess it is something wrong when using the function? Was getting the expected result with document.write(message) but not the print

1 Answer

Steven Parker
Steven Parker
231,269 Points

The "print" function is replacing the element contents each time it is used. if you want them to accumulate instead:

    outPut.innerHTML += message;  // add on (+=) instead of replace (=) content

And the "print" function doesn't need to "return" anything.

Hi Steve, does it mean all the student records actually appeared on the index.html when I run the site, but the previous 4 were replaced by the last record?

Steven Parker
Steven Parker
231,269 Points

Yes, but nothing is rendered until the script completes. Even if it was, it would likely be too fast to see.

Happy coding!