滚动到该部分时，jQuery技能栏效果开始

Question

我只是希望我的技能条效果在我滚动到该部分时就开始，例如，在我的简介部分中，当我向下滚动到技能部分时，它会触发效果:)非常感谢！

HTML：

<div class="col-md-5 col-centered">
           <div class="skillbar clearfix " data-percent="95%">
  <div class="skillbar-title" style="background: #131313;"><span>Photography</span></div>
  <div class="skillbar-bar" style="background: #131313;"></div>
  <div class="skill-bar-percent">95%</div>
</div>

 <div class="skillbar clearfix " data-percent="85%">
  <div class="skillbar-title" style="background: #131313;"><span>Videography</span></div>
  <div class="skillbar-bar" style="background: #131313;"></div>
  <div class="skill-bar-percent">85%</div>
</div>

 <div class="skillbar clearfix" data-percent="75%">
  <div class="skillbar-title" style="background: #131313;"><span>Illustrator</span></div>
  <div class="skillbar-bar" style="background: #131313;"></div>
  <div class="skill-bar-percent">75%</div>
</div>

<script> 
jQuery('.skillbar').each(function(){
  jQuery(this).find('.skillbar-bar').animate({
    width:jQuery(this).attr('data-percent')
  },6000);
});

</script>

CSS：

.skillbar {
    position:relative;
    display:block;
    margin-bottom:15px;
    width:100%;
    background:#eee;
    height:35px;
    border-radius:3px;
    -moz-border-radius:3px;
    -webkit-border-radius:3px;
    -webkit-transition:0.4s linear;
    -moz-transition:0.4s linear;
    -ms-transition:0.4s linear;
    -o-transition:0.4s linear;
    transition:0.4s linear;
    -webkit-transition-property:width, background-color;
    -moz-transition-property:width, background-color;
    -ms-transition-property:width, background-color;
    -o-transition-property:width, background-color;
    transition-property:width, background-color;
}

.skillbar-title {
    position:absolute;
    top:0;
    left:0;
    font-weight:bold;
    font-size:13px;
    color:#fff;
    background:#6adcfa;
    -webkit-border-top-left-radius:3px;
    -webkit-border-bottom-left-radius:4px;
    -moz-border-radius-topleft:3px;
    -moz-border-radius-bottomleft:3px;
    border-top-left-radius:3px;
    border-bottom-left-radius:3px;
}

.skillbar-title span {
    display:block;
    background:rgba(0, 0, 0, 0.1);
    padding:0 20px;
    height:35px;
    line-height:35px;
    -webkit-border-top-left-radius:3px;
    -webkit-border-bottom-left-radius:3px;
    -moz-border-radius-topleft:3px;
    -moz-border-radius-bottomleft:3px;
    border-top-left-radius:3px;
    border-bottom-left-radius:3px;
}

.skillbar-bar {
height:35px;
width:0px;
background:#6adcfa;
border-radius:3px;
-moz-border-radius:3px;
-webkit-border-radius:3px;
float: left;
}

.containers {
    min-height: 100%;
      height: 100vh;


}
.skill-bar-percent {
    position:absolute;
    right:10px;
    top:0;
    font-size:11px;
    height:35px;
    line-height:35px;
    color:#444;
    color:rgba(0, 0, 0, 0.4);
}

谢谢！

Answer 1

您需要将.scrollTop()窗口值与.offset().top容器div的垂直位置.offset().top进行.skillbar 。 当刚刚触发添加到窗口高度值的窗口滚动位置大于容器div的顶部偏移量时，即在以下情况下，后一个div将进入视图：

jQuery(window).scrollTop() + jQuery(window).height() > jQuery('#skills').offset().top

然后将触发.animate()函数。

** 请注意 ，我将id skills分配给<div class="col-md-5 col-centered">

看一下这个：

JS小提琴

 var skillsDiv = jQuery('#skills'); jQuery(window).on('scroll', function() { var winT = jQuery(window).scrollTop(), winH = jQuery(window).height(), skillsT = skillsDiv.offset().top; if (winT + winH > skillsT) { jQuery('.skillbar').each(function() { jQuery(this).find('.skillbar-bar').animate({ width: jQuery(this).attr('data-percent') }, 6000); }); } }); 

 body{ margin:0; padding:0; height:1200px; } #test{ height:800px; } .skillbar { position:relative; display:block; margin-bottom:15px; width:100%; background:#eee; height:35px; border-radius:3px; -moz-border-radius:3px; -webkit-border-radius:3px; -webkit-transition:0.4s linear; -moz-transition:0.4s linear; -ms-transition:0.4s linear; -o-transition:0.4s linear; transition:0.4s linear; -webkit-transition-property:width, background-color; -moz-transition-property:width, background-color; -ms-transition-property:width, background-color; -o-transition-property:width, background-color; transition-property:width, background-color; } .skillbar-title { position:absolute; top:0; left:0; font-weight:bold; font-size:13px; color:#fff; background:#6adcfa; -webkit-border-top-left-radius:3px; -webkit-border-bottom-left-radius:4px; -moz-border-radius-topleft:3px; -moz-border-radius-bottomleft:3px; border-top-left-radius:3px; border-bottom-left-radius:3px; } .skillbar-title span { display:block; background:rgba(0, 0, 0, 0.1); padding:0 20px; height:35px; line-height:35px; -webkit-border-top-left-radius:3px; -webkit-border-bottom-left-radius:3px; -moz-border-radius-topleft:3px; -moz-border-radius-bottomleft:3px; border-top-left-radius:3px; border-bottom-left-radius:3px; } .skillbar-bar { height:35px; width:0px; background:#6adcfa; border-radius:3px; -moz-border-radius:3px; -webkit-border-radius:3px; float: left; } .containers { min-height: 100%; height: 100vh; } .skill-bar-percent { position:absolute; right:10px; top:0; font-size:11px; height:35px; line-height:35px; color:#444; color:rgba(0, 0, 0, 0.4); } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> <div id="test">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Velit illum dolores fugit ut ratione quidem rem eveniet id, sapiente facilis maxime suscipit nostrum. Alias, voluptatum ipsa unde nemo magni atque!</div> <div id="skills" class="col-md-5 col-centered"> <div class="skillbar clearfix " data-percent="95%"> <div class="skillbar-title" style="background: #131313;"><span>Photography</span></div> <div class="skillbar-bar" style="background: #131313;"></div> <div class="skill-bar-percent">95%</div> </div> <div class="skillbar clearfix " data-percent="85%"> <div class="skillbar-title" style="background: #131313;"><span>Videography</span></div> <div class="skillbar-bar" style="background: #131313;"></div> <div class="skill-bar-percent">85%</div> </div> <div class="skillbar clearfix" data-percent="75%"> <div class="skillbar-title" style="background: #131313;"><span>Illustrator</span></div> <div class="skillbar-bar" style="background: #131313;"></div> <div class="skill-bar-percent">75%</div> </div>