滚动div颜色更改

Question

Trying to change the colour of btns within a menu dependant on scroll according to the div.. but not working right.. Added a pic to help understand what im trying to do.

html menu btns:

<div class="left-bar-preview">
    <div class="image mini-sub"><img class="icon-image" src="../images/human.svg" width="42">
    </div>
    <a class="mini-sub w-inline-block" href="#" id="name-btn">
      <div></div>
    </a>
    <a class="mini-sub w-inline-block" href="#" id="style-btn">
      <div></div>
    </a>
    <a class="mini-sub w-inline-block" href="#" id="position-btn">
      <div></div>
    </a>
    <a class="mini-sub w-inline-block" href="#" id="information-btn">
      <div></div>
    </a>
    <a class="mini-sub w-inline-block" href="#" id="budget-btn">
      <div></div>
    </a>
    <a class="mini-sub w-inline-block" href="#" id="photos-btn">
      <div></div>
    </a>
  </div>

html div:

<div class="name preview-content w-clearfix" data-ix="on-scroll-light-up" id="name-div">
    <h4 class="field-box spacing"><strong>Name</strong></h4>
    <h4>My new tattoo</h4>
  </div>
  <div class="name preview-content w-clearfix" id="style-div">
    <h4 class="field-box spacing"><strong>Style</strong></h4>
    <h4>Heading</h4>
  </div>
  <div class="name preview-content w-clearfix" id="position-div">
    <h4 class="field-box spacing"><strong>Position on body</strong></h4>
    <h4>Black &amp; White</h4>
  </div>
  <div class="name preview-content w-clearfix" id="side-div">
    <h4 class="field-box spacing"><strong>Side</strong></h4>
    <h4>Right</h4>
  </div>
  <div class="name preview-content w-clearfix" id="information-div">
    <h4 class="field-box spacing"><strong>Brief</strong></h4>
    <h4>"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."<br>"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."<br>"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."</h4>
  </div>
  <div class="name preview-content w-clearfix" id="budget-div">
    <h4 class="field-box spacing"><strong>Budget</strong></h4>
    <h4>$200-$400</h4>
  </div>
  <div class="name preview-content w-clearfix" id="photos-div">
    <h4 class="field-box spacing"><strong>Photos</strong></h4>
  </div>
</div>

javascript:

<script>
$(window).scroll(function(){;
    w = Math.floor( $(window).scrollTop() );  
    $('.mini-sub').css( 'background-color', '' ); 
    if(w<=$("#name-div").offset().top){
         $("#name-btn").css( 'background-color', '#972663' );   
    }else if(w<=$("#style-div").offset().top){
         $("#style-btn").css( 'background-color', '#972663' );   
    }else if(w<=$("#position-div").offset().top){
         $("#position-btn").css( 'background-color', '#972663' );   
    }else if(w<=$("#information-div").offset().top){
         $("#information-btn").css( 'background-color', '#972663' );   
    }else if(w<=$("#budget-div").offset().top){
         $("#budget-btn").css( 'background-color', '#972663' ); 
    }else{
         $("#photos-div").css( 'background-color', '#972663' );   
         }

}); 
</script>

Answer 1

Is this what you are looking for - JS code:

$(".right").scroll(function(){
var st = $(this).scrollTop();
if(st <= 50){
    $(".A").css("color", "red")
}
else if(st <= 100){
    $(".B").css("color", "red")
}
else if(st <= 150){
    $(".C").css("color", "red")
}
});

https://jsfiddle.net/ashwyn/qudnauvq/

Answer 2

This is a modification to @MotaBOS's solution

$(".right").scroll(function(){
var st = $(this).scrollTop();
  $(".left span").css("color", "black")
if(st <= 50){

    $(".A").css("color", "red")
}
else if(st <= 100){
    $(".B").css("color", "red")
}
else {
    $(".C").css("color", "red")
}