检测可滚动下拉的结束 [英] detecting the end of the scrollable drop down

问题描述

我正在动态生成一个选择选项框。可以有任意数量的选项。当用户向下滚动到框的末尾时，我需要触发一个事件，（我将调用服务器并使用更多选项填充选择）。它就像创建一个分页一样，但是在下拉框中。

I am generating a select option box dynamically. There can be any number of options. When the user scrolls down to the end of the box, I need to trigger an event, (where I will call the server and populate the select with more options). Its like creating a pagination, but in dropdown box.

有人可以告诉我这是怎么做的。

Can anybody tell me how can this be done.

因此，当用户滚动到下拉列表的末尾时，我唯一需要的是触发事件。多数民众赞成

So the only thing I need is to trigger an event, when user scrolls to the end of the dropdown. Thats all

<select style="height: 30px;line-height:30px;" class="scroll">
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    <option>5</option>
    <option>6</option>
    <option>7</option>
    <option>8</option>
</select>

请不要担心我将如何使用选项填充选择框，因为我正在使用meteorJs，我会很容易实现它。

Please don't worry about how I am gonna populate the select box with option, as I am using meteorJs, that I will achieve it easily.

唯一的要求是发起一个事件。

The only requirement is to fire an event.

推荐答案

你可以尝试这个，我已经创建了一个关于这个的演示，并在列表底部滚动时生成一个弹出窗口。

you can try this one, i have created a demo regarding this and generate a popup while scroll at the bottom of list.

工作小提琴演示： https://jsfiddle.net/j68o44Ld/

<div class="subtask-li">
<span class="main-tlist"> 
<span class="icon-taskListing"></span> 
<span class="subselectedList">Default</span> 
<span class="icon-subcaret"></span> </span>
<ul class="subtask-pick">
<li><a href="javascript:;">General issues</a></li>
<li><a href="javascript:;">Default</a></li>
<li><a href="javascript:;">Android Games Issues</a></li>
<li><a href="javascript:;">pt issues</a></li>
<li><a href="javascript:;">Server Development</a></li>
<li><a href="javascript:;">Resource Integration</a></li>
<li><a href="javascript:;">Server Infrastructure</a></li>
</ul>
    </div>

    $(document).on("click",".main-tlist",function(){
    $('.subtask-pick').toggle();
    });

    $('.subtask-pick').scroll(function () {
          if ($(this)[0].scrollHeight - $(this).scrollTop() <=  $(this).outerHeight()) {
                alert("end of scroll");
              // You can perform as you want

          }
    });



  .subtask-li {
        border: 1px solid #dfe8f1;
        cursor: pointer;
        position: relative;
        background: rgba(0, 0, 0, 0) linear-gradient(to bottom, rgba(255, 255, 255, 1) 0%, rgba(246, 246, 246, 1) 100%) repeat scroll 0 0;
        border-radius: 3px;
        float: left;

        left: 5px;
        padding: 5px;
        top: 6px;
    }


    .subtask-pick{
       background-clip: padding-box;
        background-color: #fff;
        border: 1px solid #dfe8f1;
        border-radius: 3px;
        box-shadow: 0 1px 7px 2px rgba(135, 158, 171, 0.2);
        display: none;
        list-style: outside none none;
        padding: 0 0 10px;
        position: absolute;
        z-index: 9; 
        float: left;
       width: 220px;
        list-style: outside none none; height:220px; overflow:auto;
    }
    .icon-taskListing {
        display: inline-block;
        vertical-align: middle;
    }
    .subselectedList {
        overflow: hidden;
        padding: 0 5px;
        text-overflow: ellipsis;
        white-space: nowrap;
        width: 116px;
    }
    ul.subtask-pick li {
      float: none;
      display: block;
      clear: both;

      position: relative;
    }
    ul.subtask-pick li a {
      padding: .9em 1em .9em .8em;
      position: relative;
        clear: both;
      cursor: pointer;
      display: block;

      white-space: nowrap;
       text-overflow: ellipsis;
      overflow: hidden;
    }
    ul.subtask-pick li a:hover {
      background: none repeat scroll 0 0 #eff4f6;
      cursor: pointer;
    }
    a {
      text-decoration: none;
      outline: 0;
      color: #4c4c4c;
    }

这篇关于检测可滚动下拉的结束的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！