jquery - jquery knob animate on load section

Question

I'm using jquery.knob plugin in a website is very easy to implement. I animate it and everything is ok, but i would like animate effect start when I scroll to specific section of the web: for example when I scroll to #about section.

Anybody Knows if is that posible?

thanks in advance

Answer 1

有几个 jQuery 插件可以检查元素是否滚动到视图中，例如 jquery.inview。

示例设置：

<input type='text' class='dial' value='0' data-number='100' />
<div style="height: 300px">scroll down</div>
<div class="startKnob">start</div>

初始化旋钮并为动画编写一个函数。只需绑定inview到视口之外的元素，并且应该在它出现时立即启动动画。

$(function () {
  $('.dial').knob({
     min: '0',
     max: '100',
     readOnly: true
  });
});

startKnob =  function() {
  $('.dial').animate({
      value: $('.dial').data('number')
  },{
      duration: 950,
      easing: 'swing',
      progress: function () {
                 $('.dial').val(Math.round(this.value)).trigger('change');
     }
 });
}

$('.startKnob').bind('inview', startKnob);

此处的工作示例：在查看特定元素时启动旋钮动画