Ways to mention an element in an if clause

Although this question may have been addressed before, I am having trouble finding the solution due to my inability to articulate the problem.

Let me provide an example of the code:

<script>
function choose(element){
    var parent = element.parentNode;
    var nextquestion = parseInt(parent.dataset.number)+1;
    parent.style.display = "none";

    if (document.getElementsByClassName("QuestionGroup")[0].dataset.number === nextquestion) {
        WHATGOESHERE?.style.display = "inline";
    }
}
</script>
<div class="QuestionGroup" data-number="1" style="display:inline;">
<button onclick="choose(this);">An Answer</button></div>
<div class="QuestionGroup" data-number="2">Second Question</div>

Essentially, when the user clicks the button, the choose() function will identify which question group the button belongs to. It will then hide that group and reveal the second question group. Everything works smoothly until I try to reveal the next question.

I have used an if statement to search for all elements with the class "QuestionGroup" and compare their data-number attribute to the nextquestion variable. If they match, I want to modify the style of that element. However, I am at a loss on how to actually target that specific element to change its style.

Answer №1

const parentElement = element.parentNode;
const nextIndex = parseInt(parentElement.dataset.number) + 1;
parentElement.style.display = "none";

if (parentElement.getElementsByClassName("QuestionGroup")[nextIndex]) {
    parentElement.getElementsByClassName("QuestionGroup")[nextIndex].style.display = "inline";
}

Understanding which parts of your code correspond to specific elements can be challenging. While this solution should function as intended, further clarification or explanation may help optimize it for your needs.

Remember that getElementsByClassName returns a node list, allowing you to easily check if the next index exists before displaying it.

Answer №2

Hooray! I just want to express my gratitude for the valuable insights you all have provided me. I've come to realize that JavaScript operates in a unique way compared to other programming languages I'm familiar with.

Essentially, you pointed out that getElementsByClass returns an array of elements, which clearly wouldn't be suitable in this scenario. So, after doing some research, I came across this gem!

document.querySelector('[data-number="' + String(nextquestion) + '"]').style.display = "inline";

This solution is so much more elegant compared to my clunky if statement!

Big thanks to each and every one of you for your assistance!

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