What is the best way to iterate through multiple arrays using a single for loop

Question

What is the best way to iterate through multiple arrays using a single for loop

I have various hidden popups that are triggered to show on click using some JavaScript magic. As a beginner in JavaScript, I find myself writing multiple lines of code that look very similar.

Currently, my code for handling these popup boxes looks like this:

var paperComButton = document.getElementsByClassName('paperCompanieButton');

for (var i = 0; i < paperComButton.length; i++) {
  paperComButton[i].addEventListener('click', function () {
    handlePopup('paperCompanieInfo');
  });
}

The next piece of code is almost identical:

var pdfPreviewButton = document.getElementsByClassName('pdfPreviewButton');

for (var i = 0; i < pdfPreviewButton.length; i++) {
  pdfPreviewButton[i].addEventListener('click', function () {
    handlePopup('paperJobPdf');
  });
}

The issue arises when dealing with more than just these two popups, resulting in lengthy JavaScript code.

My question: Is there a way to consolidate these code snippets into a more universal solution? I hope there's a straightforward approach that can help simplify the logic for my beginner understanding!

javascript loops addeventlistener

Answer 1

Answer №1

One of the reasons why Javascript utilizes functions is to streamline repetitive tasks by encapsulating them into reusable containers. In the given scenario, the similarities lie in the behavior of the buttons and the document ID. By creating a function that accepts these two variables as arguments, you can avoid redundant code. For instance, consider defining a function like:

function setPopup(className, documentID) {
    var buttons = document.getElementsByClassName(className);

    for (var i = 0; i < buttons.length; i++) {
        buttons[i].addEventListener('click', function () {

        var greyOut = document.getElementById('greyOut');
        var popupWrapper = document.getElementById('popupWrapperFlex');
        var popup = document.getElementById(documentID);

        greyOut.style.zIndex = '5';
        popupWrapper.style.zIndex = '6';
        popup.style.zIndex = '1';
        greyOut.style.opacity = '1';
        popupWrapper.style.opacity = '1';
        popup.style.opacity = '1';
        });
    }   
}

With this function in place, you can simply call it with different parameters to execute the same functionality without rewriting the entire block of code each time:

setPopup('paperCompanieButton', 'paperCompanieInfo')
setPopup('pdfPreviewButton', 'paperJobPdf')

This approach allows for flexibility in executing the desired actions multiple times.

Answer 2

One of the reasons why Javascript utilizes functions is to streamline repetitive tasks by encapsulating them into reusable containers. In the given scenario, the similarities lie in the behavior of the buttons and the document ID. By creating a function that accepts these two variables as arguments, you can avoid redundant code. For instance, consider defining a function like:

function setPopup(className, documentID) {
    var buttons = document.getElementsByClassName(className);

    for (var i = 0; i < buttons.length; i++) {
        buttons[i].addEventListener('click', function () {

        var greyOut = document.getElementById('greyOut');
        var popupWrapper = document.getElementById('popupWrapperFlex');
        var popup = document.getElementById(documentID);

        greyOut.style.zIndex = '5';
        popupWrapper.style.zIndex = '6';
        popup.style.zIndex = '1';
        greyOut.style.opacity = '1';
        popupWrapper.style.opacity = '1';
        popup.style.opacity = '1';
        });
    }   
}

With this function in place, you can simply call it with different parameters to execute the same functionality without rewriting the entire block of code each time:

setPopup('paperCompanieButton', 'paperCompanieInfo')
setPopup('pdfPreviewButton', 'paperJobPdf')

This approach allows for flexibility in executing the desired actions multiple times.

Answer 3

Answer №2

To enhance the readability of this code, consider restructuring it as shown below:

function setupButtonsPopups(buttonClassName, popupId) {
    var buttons = document.getElementsByClassName(buttonClassName);
    var popup = document.getElementById(popupId);
    var greyOut = document.getElementById('greyOut');
    var popupWrapper = document.getElementById('popupWrapperFlex');

    for (var i = 0; i < buttons.length; i++) {
        buttons[i].addEventListener('click', function() {
            greyOut.style.zIndex = '5';
            popupWrapper.style.zIndex = '6';
            popup.style.zIndex = '1';
            greyOut.style.opacity = '1';
            popupWrapper.style.opacity = '1';
            popup.style.opacity = '1';
        });
    }
}

setupButtonsPopups('paperCompanieButton', 'paperCompanieInfo');
setupButtonsPopups('pdfPreviewButton', 'paperJobPdf');

It is important to note that the only variation between these two blocks of code lies in the buttons class name and the popup id. Therefore, creating a function that accepts these arguments will streamline the code.

Answer 4

To enhance the readability of this code, consider restructuring it as shown below:

function setupButtonsPopups(buttonClassName, popupId) {
    var buttons = document.getElementsByClassName(buttonClassName);
    var popup = document.getElementById(popupId);
    var greyOut = document.getElementById('greyOut');
    var popupWrapper = document.getElementById('popupWrapperFlex');

    for (var i = 0; i < buttons.length; i++) {
        buttons[i].addEventListener('click', function() {
            greyOut.style.zIndex = '5';
            popupWrapper.style.zIndex = '6';
            popup.style.zIndex = '1';
            greyOut.style.opacity = '1';
            popupWrapper.style.opacity = '1';
            popup.style.opacity = '1';
        });
    }
}

setupButtonsPopups('paperCompanieButton', 'paperCompanieInfo');
setupButtonsPopups('pdfPreviewButton', 'paperJobPdf');

It is important to note that the only variation between these two blocks of code lies in the buttons class name and the popup id. Therefore, creating a function that accepts these arguments will streamline the code.

What is the best way to iterate through multiple arrays using a single for loop

Answer №1

Answer №2

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