jquery:如何循环一个div [英] jquery: how to loop a div

问题描述

使用 jquery，如何连续自动滚动 div?喜欢本网站的新闻和专题部分:http://animalsasia.org/.而且，当您将鼠标悬停在滑块上时，它会停止滚动，直到您将鼠标悬停.

using jquery, how can i auto scroll a div continuously? like the news and features section of this website: http://animalsasia.org/. And also when you hover over the slider it stops the scrolling until you hover away.

是否有一个 jquery 插件可以做到这一点?任何帮助将不胜感激.

is there a jquery plugin that will do that? Any help would be much appreciated.

推荐答案

我写了一些工作示例.JsFiddle 上的实时示例.这个想法是创建位置=相对的容器，并将带有文本的 div 放入其中.此外，我们需要创建文本的副本以避免在显示文本的最后部分时出现空白.jQuery animate() 函数将完成剩下的工作.

I wrote some working example. There is live example on JsFiddle. The idea is to create container with position=relative, and put div with text into it. Also, we need to create a copy of text to avoid empty space when last part of text is showing. jQuery animate() function will do the rest.

HTML:

<div class="news_container">
    <div class="news">
       <div class="text">
           Long text
        </div>   
    </div>
</div>

CSS:

.news_container {
  border: 1px solid black;
  width:150px;
  height: 300px;   
  overflow: hidden;
  position: relative;
  padding: 3px;
}

.news {
  position: absolute; 
  left: 0px;
  top: 0px;
}

JavaScript:

JavaScript:

(function($, undefined) {
  $.fn.loopScroll = function(p_options) {
    var options = $.extend({
        direction: "upwards",
        speed: 60
    }, p_options);

    return this.each(function() {
      var obj = $(this).find(".news");
      var text_height = obj.find(".text").height();
      var start_y, end_y;
      if (options.direction == "downwards") {
        start_y = -text_height;
        end_y = 0;
      } else if (options.direction == "upwards") {
        start_y = 0;
        end_y = -text_height;
      }

      var animate = function() {
        // setup animation of specified block "obj"
        // calculate distance of animation    
        var distance = Math.abs(end_y - parseInt(obj.css("top")));

        //duration will be distance / speed
        obj.animate(
          { top: end_y },  //scroll upwards
          1000 * distance / options.speed,
          "linear",
          function() {
            // scroll to start position
            obj.css("top", start_y);
            animate();    
          }
        );
      };

      obj.find(".text").clone().appendTo(obj);
      $(this).on("mouseover", function() {
        obj.stop();
      }).on("mouseout", function() {
        animate(); // resume animation
      });
      obj.css("top", start_y);
      animate(); // start animation       
    });
  };
}(jQuery));

$(".news_container").loopScroll();

选项:

• direction(向下"或向上")——文字移动的方向；
• speed - 移动速度.

• direction ("downwards" or "upwards") - direction of text movement;
• speed - speed of movement.

这是使用此插件的示例:

Here is example of using this plugin with options:

$("#example3").loopScroll();
$("#example4").loopScroll({ speed: 120 });
$("#example1").loopScroll({ direction: "downwards" });
$("#example2").loopScroll({ direction: "downwards", speed: 30 });

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