如何使用jQuery UI设计无序列表，以便元素以UI图标而不是默认列表符号开头？ [英] How to style an unordered list with jQuery UI so that the elements begin with a UI icon instead of the default list symbol?

问题描述

我想使用作为出发点。

I would like to use an icon from the jQuery UI icon set to style an unordered list.

<div>
    <ul>
        <li>John Doe</li>
        <li>Jack Snow</li>
        <li>Mary Moe</li>
    </ul>
</div>

By default this list appears with dots in front of each element:

• John Doe
• Jack Snow
• Mary Moe

Instead I would like to replace the dot with an icon such as ui-icon-person

How to accomplish this?

解决方案

I know this question is a little out-of-date - but here is a fully working example:

HTML:

<div>
  <ul class="icon person">
    <li>John Doe</li>
    <li>Jack Snow</li>
    <li>Mary Moe</li>
  </ul>
</div>

CSS:

ul.icon {
    list-style: none; /* This removes the default bullets */
    padding-left: 20px; /* This provides proper indentation for your icons */
}
ul.icon li { 
    position: relative; /* Allows you to absolutely place the :before element
                           relative to the <li>'s bounding box. */
}
ul.icon.person li:before {
    background: url(/images/ui-icons_888888_256x240.png) -144px -96px;
   /* ex: download.jqueryui.com/themeroller/images/ui-icons_888888_256x240.png */
   /* The -144px, -96px coordinate is the location of the 16x16 Person icon */

    /* The next 2 lines are necessary in order to make the :before pseudo-element
       appear, and thereby show it's background, your icon. */
    content: ''; 
    display: inline-block;

    /* Absolute is always in relation to the nearest positioned parent. In this
       case, that's the <li> with _relative_ positioning, above. */
    position: absolute;

    left: -16px; /* Places the icon 16px left of the <li>'s edge */
    top: 2px;    /* Adjust this based on your font-size and line-height */

    height: 16px; width: 16px; /* jQuery UI icons (with spacing) are 16x16 */
}

Here is a jsFiddle showing it working. The result will look something like this:

The reason that I used the :before pseudo-element is that you are wanting to use jQuery-UI icons - which come in the form of a sprite map. In other words - all of the icons are found in a grid pattern within a single image, as in this example:

Source: http://download.jqueryui.com/themeroller/images/ui-icons_888888_256x240.png

If you tried to just make the background of the <li> that image, it would be more complicated to make the single icon that you want appear without also displaying all of its neighbors. By using the :before element, though, you can create a smaller, 16px by 16px box for the icon, and thereby easily trim down to showing only one icon.

If you want to learn more about :before and :after pseudo-elements, check out this fantastic article as a starting point.

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