Compiling a roster of students and linking a specific function to each individual button

My goal is to enable clients to create a list of students and then easily access more information by clicking on the respective student's button. I have successfully implemented the creation of buttons with each student's name displayed, but the issue is that the function only triggers when I click the submit button to add the student to the list, not when I click on the actual student button.

function updateStudentList() {
    var html = "";

    for (var i = 0; i < students.length; i++) {
        html += "<li><button type='button' class='studentButton'" + "id=" + students[i].name +">" + students[i].name + "</button></li>";
    }

    $('#studentList').html(html);

    for (var i = 0; i < students.length; i++) {
        document.getElementById(students[i].name).addEventListener('click', openStudentInfo(students[i].name));
    }
}

function openStudentInfo(studentName) {
    console.log("Opening " + studentName + " info.");

    var studentInfo = requestStudentByName(studentName);

    if (studentInfo != null) {
        var studentInfoForm = $("#studentInfoForm");
        var html = "";

        html += "<h3>Student Name: " + studentInfo.name + "</h3>";
        html += "<h3>Student ID: " + studentInfo.studentID + "</h3>";

        studentInfoForm.html(html);

        $("#studentInfoModal").show();
    } 
}

HTML:

<ul data-role="listview" id="studentList"> </ul>

Important Note: It is necessary to avoid using the onclick tag in HTML due to security concerns, which are also compounded by Cordova blocking this functionality.

Answer №1

Your event binding method needs some improvement. Consider using the following approach:

$(document).ready(function() {
    $("#studentList").on("click", ".studentButton", function() {
        var studentId = $(this).data("studentid");
        openStudentInfo(studentId);
    });
});

When generating your HTML, make sure to include the necessary attributes:

html += "<li><button type='button' class='studentButton' data-studentid='" + students[i].studentID +"'>" + students[i].name + "</button></li>";

This method of event delegation ensures that regardless of how elements are added within the root element (studentList in this case), the events will still be triggered correctly as they are bound to the parent element rather than the dynamic elements themselves.

Answer №2

Without using jQuery, here is the revised implementation based on DontVoteMeDown's solution

document.getElementById('studentList').addEventListener('click', function(event) {
    var clickedElement = event.target;
    if(clickedElement.className === 'studentButton') {
        var studentIdentifier = clickedElement.dataset.studentId;
        displayStudentInformation(studentIdentifier);
    }
});

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