有人可以帮助修复我的不透明度滚动效果

Question

当我把我的div id标签#fading一切似乎一下子消失。我希望我的部件逐渐消失;个别。我对jquery不太熟练，所以一些帮助会很棒。

第1部分 第2部分 第3部分 第4部分 第5部分

     </div> 
        </div> 
        </nav> 
       </div> 


    <div style="background:white;"> 
      <div class="row" id="fading" style="padding-left:15%; padding-right:15%;margin-top:100px;"> 
       <div class="col-xs-8"> 
       <p><b><em>Part 1:</b></em> Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> 
      </div> 
      <div class="col-xs-4"> 
       <img src="./photo1.jfif" class="img-responsive "> 
      </div> 
     </div> 

     <div class="row" style="padding-left:15%; padding-right:15%;margin-top:150px;"> 
       <div class="col-xs-8"> 
       <p><b><em>Part 2:</b></em> Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> 
      </div> 
      <div class="col-xs-4"> 
       <img src="./photo2.jpg" class="img-responsive "> 
      </div> 
     </div> 

     <div class="row" style="padding-left:15%; padding-right:15%;margin-top:200px;"> 
       <div class="col-xs-8"> 
       <p><b><em>Part 3:</b></em> Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> 
      </div> 
      <div class="col-xs-4"> 
       <img src="./photo3.jfif" class="img-responsive "> 
      </div> 
     </div> 

     <div class="row" style="padding-left:15%; padding-right:15%;margin-top:250px;"> 
       <div class="col-xs-8"> 
       <p><b><em>Part 4:</b></em> Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> 
      </div> 
      <div class="col-xs-4"> 
       <img src="./photo4.jfif" class="img-responsive "> 
      </div> 
     </div> 

     <div class="row" style="padding-left:15%; padding-right:15%;margin-top:300px;"> 
       <div class="col-xs-8"> 
       <p><b><em>Part 5:</b></em> Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p> 
      </div> 
      <div class="col-xs-4"> 
       <img src="./photo5.jfif" class="img-responsive "> 
      </div> 
     </div> 
</body> 

这里是一个需要修复或改剧本。

<script> 
var target = $('#fading'); 
var targetHeight = target.outerHeight(); 

$(document).scroll(function(e){ 
var scrollPercent = (targetHeight - window.scrollY)/targetHeight; 
if(scrollPercent >= 0){ 
    target.css('opacity', scrollPercent); 
} 
}); 
</script> 

Answer 1

我认为这是你可能会后？

http://codepen.io/anon/pen/pJomJY?editors=001

脚本现在占每个.row元素上的滚动百分比：

$(window).scroll(function() { 

    var posY = window.scrollY; 

    $('.row').each(function(key, item) { 

     var target = $(item); 
     var topMargin = parseInt(target.css('margin-top')); 
     var targetHeight = target.outerHeight(true); 
     var targetStart = target.position().top; 
     var targetEnd = targetStart+targetHeight; 
     var scrollPercent = (targetEnd-posY)/targetHeight; 
     scrollPercent = Math.max(0, Math.min(scrollPercent, 1)); 

     if (posY > targetStart-topMargin) { 
      target.css('opacity', scrollPercent); 
     } 

    }); 
}); 

Answer 2

试试下面的查询：

$(document).scroll(function(e){ 
    $('.row').each(function(i, o) { 

     var target = $(o); 
     var targetHeight = target.outerHeight() + target.position().top; 

     var scrollPercent = (targetHeight - window.scrollY)/targetHeight; 
     if(scrollPercent >= 0){ 
      target.css('opacity', scrollPercent); 
     } 

    }) 
}); 

我希望它可以帮助你！