JS/CSS Scroll to top-CodePudding

I have these simple tabs on my website but I'm missing a feature.

I'm reading a tab and scrolling to the bottom. When I'm done with reading the tab and switching to another tab, the scroll position stays the same.

What I'm trying to achieve is, automatically scroll to the top whenever a tab is clicked. (Not to the top of the whole page, just scroll to the top of the tab content.)

Also, is there a way to display the 'scroll to top' function in a smooth transition / animation?

const btn = [].slice.call(document.getElementsByTagName('button'))
btn.forEach((item, index) => {
  item.addEventListener('click',function(){
    btn.forEach((item) => {item.classList.remove('active')})
    item.classList.add('active')
    document.getElementById('tab').setAttribute('data-tab', index)
  })
}  
)


// When the user scrolls the page, execute myFunction
window.onscroll = function() {myFunction()};

// Get the header
var header = document.getElementById("myHeader");

// Get the offset position of the navbar
var sticky = header.offsetTop;

// Add the sticky class to the header when you reach its scroll position. Remove "sticky" when you leave the scroll position
function myFunction() {
  if (window.pageYOffset > sticky) {
    header.classList.add("sticky");
  } else {
    header.classList.remove("sticky");
  }
}

button {background-color:#000;color:#fff}


.wrapper {
    overflow: hidden;
}

.tabs {
    position: relative;
    -webkit-transition: all .9s ease-in-out; 
    -moz-transition: all .9s ease-in-out; 
    -ms-transition: all .9s ease-in-out; 
    -o-transition: all .9s ease-in-out; 
    transition: all .9s ease-in-out;
    pointer-events:none;
 
}

.tabs> * {
    width: 100%;
}

.tabs[data-tab='1'] {
    transform: translateX(-100%);
}

.tabs[data-tab='2'] {
    transform: translateX(-200%);
}
.tabs[data-tab='3'] {
    transform: translateX(-300%);
}
.tabs[data-tab='4'] {
    transform: translateX(-400%);
}

.inliner {

    white-space: nowrap;
}

.inliner > * {
    display: inline-block;
    *display: inline;
    *zoom: 1;
    font-size: 1rem;
    letter-spacing: normal;
    vertical-align: top;
    word-spacing: normal;
    white-space: normal;
}

.sticky {
  position: fixed;
  top: 0;
  width: 100%
}



.textabove {
  font-size:40px;
   margin-bottom:40px}

<div >Some content above the tabs</div>
<div >
 <div id="myHeader"> 
      <button> Tab 1</button>
       <button> Tab 2</button>
       <button> Tab 3</button>
  </div>        
    <div id="tab" >
        <div>
            <h2>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</h2>
        
        </div>
        <div>
            <h2>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</h2>
       
        </div>
        <div>
            <h2>Content 3</h2>
            
        </div>
    </div>
</div>

CodePudding user response：

You can use the scroll(x,y) Function of an Element. Doc here

Like this:

//After the line 6 (OR before) on Js ("document.getElementById('tab').setAttribute('data-tab', index))
window.scroll(0,sticky)

CodePudding user response：

You can use Element.scrollIntoView() (MDN) So for your transition to the top page, you can use Window.scrollTo({ top: 0, left: 0, behavior: 'smooth' })

const btn = [].slice.call(document.getElementsByTagName('button'))
btn.forEach((item, index) => {
  item.addEventListener('click',function(){
    btn.forEach((item) => {item.classList.remove('active')})
    item.classList.add('active')
    document.getElementById('tab').setAttribute('data-tab', index)
    // You can use Element.scrollIntoView
    document.getElementById('tab').scrollIntoView({ behavior: 'smooth' });
  })
}  
)


// When the user scrolls the page, execute myFunction
window.onscroll = function() {myFunction()};

// Get the header
var header = document.getElementById("myHeader");

// Get the offset position of the navbar
var sticky = header.offsetTop;

// Add the sticky class to the header when you reach its scroll position. Remove "sticky" when you leave the scroll position
function myFunction() {
  if (window.pageYOffset > sticky) {
    header.classList.add("sticky");
  } else {
    header.classList.remove("sticky");
  }
}

button {background-color:#000;color:#fff}


.wrapper {
    overflow: hidden;
}

.tabs {
    position: relative;
    -webkit-transition: all .9s ease-in-out; 
    -moz-transition: all .9s ease-in-out; 
    -ms-transition: all .9s ease-in-out; 
    -o-transition: all .9s ease-in-out; 
    transition: all .9s ease-in-out;
    pointer-events:none;
 
}

.tabs> * {
    width: 100%;
}

.tabs[data-tab='1'] {
    transform: translateX(-100%);
}

.tabs[data-tab='2'] {
    transform: translateX(-200%);
}
.tabs[data-tab='3'] {
    transform: translateX(-300%);
}
.tabs[data-tab='4'] {
    transform: translateX(-400%);
}

.inliner {

    white-space: nowrap;
}

.inliner > * {
    display: inline-block;
    *display: inline;
    *zoom: 1;
    font-size: 1rem;
    letter-spacing: normal;
    vertical-align: top;
    word-spacing: normal;
    white-space: normal;
}

.sticky {
  position: fixed;
  top: 0;
  width: 100%
}



.textabove {
  font-size:40px;
   margin-bottom:40px}

<div >Some content above the tabs</div>
<div >
 <div id="myHeader"> 
      <button> Tab 1</button>
       <button> Tab 2</button>
       <button> Tab 3</button>
  </div>        
    <div id="tab" >
        <div>
            <h2>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</h2>
        
        </div>
        <div>
            <h2>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</h2>
       
        </div>
        <div>
            <h2>Content 3</h2>
            
        </div>
    </div>
</div>