On click scroll up or down 100vh pure javascript - Stack Overflow

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I am trying to implement a simple button that on click will scroll the page either up or down 100vh between my sections. I can see plenty of examples doing this with jQuery but I'm looking for a pure javascript solution. I'm not to sure how to achieve it.

Appreciate any advice.

HTML

<section class="section section-1">
  <div class="btn"></div>
</section>
<section class="section section-2">
  <div class="btn"></div>
</section>
<section class="section section-3">
  <div class="btn"></div>
</section>

CSS

.section {
  width: 100%;
  height: 100vh:
}

This is what I have e up with so far

for (var s = 0; s < btn.length; s++) {
    btn[s].addEventListener('click', function(){
        window.scrollBy(0,1000);
    });
}

I am trying to implement a simple button that on click will scroll the page either up or down 100vh between my sections. I can see plenty of examples doing this with jQuery but I'm looking for a pure javascript solution. I'm not to sure how to achieve it.

Appreciate any advice.

HTML

<section class="section section-1">
  <div class="btn"></div>
</section>
<section class="section section-2">
  <div class="btn"></div>
</section>
<section class="section section-3">
  <div class="btn"></div>
</section>

CSS

.section {
  width: 100%;
  height: 100vh:
}

This is what I have e up with so far

for (var s = 0; s < btn.length; s++) {
    btn[s].addEventListener('click', function(){
        window.scrollBy(0,1000);
    });
}

• javascript

Share Improve this question Follow asked Jun 6, 2018 at 15:08 LiamLiam 11122 gold badges66 silver badges1313 bronze badges

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2 Answers 2

Sorted by: Reset to default 7

There are a few ways to get viewport size in JavaScript. Using one of these ways, you should be able to scroll as you are with the viewport size in place of your 1000.

For instance, if I wanted to scroll exactly the height of one viewport with window.innerHeight:

let pageHeight = window.innerHeight;
window.scrollBy(0, pageHeight);

document.querySelectorAll('.btn').forEach(btn => {
  btn.addEventListener('click', function() {
    let scrollDistance = document.documentElement.clientHeight;
    if (btn.className.split(' ').includes('scroll-up')) {
      scrollDistance *= -1;
    }
    window.scrollBy(0, scrollDistance);
  });
});

body {
  margin: 0;
}

.section {
  width: 100%;
  height: 100vh;
}

.section-1 {
  background-color: blue;
}

.section-2 {
  background-color: red;
}

.section-3 {
  background-color: green;
}

<section class="section section-1">
  <div class="btn scroll-down">V</div>
  <div class="btn scroll-up">^</div>
</section>
<section class="section section-2">
  <div class="btn scroll-down">V</div>
  <div class="btn scroll-up">^</div>
</section>
<section class="section section-3">
  <div class="btn scroll-down">V</div>
  <div class="btn scroll-up">^</div>
</section>

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