jQuery UI 实例 - 定位（Position）

谁践踏了优雅 2024-03-23 07:20 46阅读 0赞

相对窗口、文档、锚、光标/鼠标等元素定位一个元素。

如需了解更多有关 `.position()` 方法的细节，请查看 API 文档 [.position()][.position]。

### 默认功能 ###

使用表单控件配置位置，或者拖拽被定位的元素来修改它的偏移量。向四周拖拽父元素来查看碰撞检测。

>     <!doctype html>
>     <html lang="en">
>     <head>
>       <meta charset="utf-8">
>       <title>jQuery UI 定位（Position） - 默认功能</title>
>       <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
>       <script src="//code.jquery.com/jquery-1.9.1.js"></script>
>       <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
>       <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css">
>       <style>
>       #parent {
>         width: 60%;
>         height: 40px;
>         margin: 10px auto;
>         padding: 5px;
>         border: 1px solid #777;
>         background-color: #fbca93;
>         text-align: center;
>       }
>       .positionable {
>         position: absolute;
>         display: block;
>         right: 0;
>         bottom: 0;
>         background-color: #bcd5e6;
>         text-align: center;
>       }
>       #positionable1 {
>         width: 75px;
>         height: 75px;
>       }
>       #positionable2 {
>         width: 120px;
>         height: 40px;
>       }
>       select, input {
>         margin-left: 15px;
>       }
>       </style>
>       <script>
>       $(function() {
>         function position() {
>           $( ".positionable" ).position({
>             of: $( "#parent" ),
>             my: $( "#my_horizontal" ).val() + " " + $( "#my_vertical" ).val(),
>             at: $( "#at_horizontal" ).val() + " " + $( "#at_vertical" ).val(),
>             collision: $( "#collision_horizontal" ).val() + " " + $( "#collision_vertical" ).val()
>           });
>         }
>      
>         $( ".positionable" ).css( "opacity", 0.5 );
>      
>         $( "select, input" ).bind( "click keyup change", position );
>      
>         $( "#parent" ).draggable({
>           drag: position
>         });
>      
>         position();
>       });
>       </script>
>     </head>
>     <body>
>      
>     <div id="parent">
>       <p>
>       这是父元素的位置。
>       </p>
>     </div>
>      
>     <div class="positionable" id="positionable1">
>       <p>
>       to position
>       </p>
>     </div>
>      
>     <div class="positionable" id="positionable2">
>       <p>
>       to position 2
>       </p>
>     </div>
>      
>     <div style="padding: 20px; margin-top: 75px;">
>       定位...
>       <div style="padding-bottom: 20px;">
>         <b>my:</b>
>         <select id="my_horizontal">
>           <option value="left">left</option>
>           <option value="center">center</option>
>           <option value="right">right</option>
>         </select>
>         <select id="my_vertical">
>           <option value="top">top</option>
>           <option value="center">center</option>
>           <option value="bottom">bottom</option>
>         </select>
>       </div>
>       <div style="padding-bottom: 20px;">
>         <b>at:</b>
>         <select id="at_horizontal">
>           <option value="left">left</option>
>           <option value="center">center</option>
>           <option value="right">right</option>
>         </select>
>         <select id="at_vertical">
>           <option value="top">top</option>
>           <option value="center">center</option>
>           <option value="bottom">bottom</option>
>         </select>
>       </div>
>       <div style="padding-bottom: 20px;">
>         <b>collision:</b>
>         <select id="collision_horizontal">
>           <option value="flip">flip</option>
>           <option value="fit">fit</option>
>           <option value="flipfit">flipfit</option>
>           <option value="none">none</option>
>         </select>
>         <select id="collision_vertical">
>           <option value="flip">flip</option>
>           <option value="fit">fit</option>
>           <option value="flipfit">flipfit</option>
>           <option value="none">none</option>
>         </select>
>       </div>
>     </div>
>      
>      
>     </body>
>     </html>

### 图像循环 ###

一个照片浏览器的原型，使用 Position 分别把图片定为在左边、中间、右边，然后循环显示。使用顶部的链接来循环图像，或者在图像的左侧或右侧点击来循环图像。请注意，当调整窗口大小时，会重新定位图像。

>     <!doctype html>
>     <html lang="en">
>     <head>
>       <meta charset="utf-8">
>       <title>jQuery UI 定位（Position） - 图像循环</title>
>       <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
>       <script src="//code.jquery.com/jquery-1.9.1.js"></script>
>       <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
>       <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css">
>       <style>
>       body {
>         margin: 0;
>       }
>       #container {
>         overflow: hidden;
>         position: relative;
>         height: 400px;
>       }
>      
>       img {
>         position: absolute;
>       }
>       </style>
>       <script>
>       $(function() {
>         // 重构部件，去除这些插件方法
>         $.fn.left = function( using ) {
>           return this.position({
>             my: "right middle",
>             at: "left+25 middle",
>             of: "#container",
>             collision: "none",
>             using: using
>           });
>         };
>         $.fn.right = function( using ) {
>           return this.position({
>             my: "left middle",
>             at: "right-25 middle",
>             of: "#container",
>             collision: "none",
>             using: using
>           });
>         };
>         $.fn.center = function( using ) {
>           return this.position({
>             my: "center middle",
>             at: "center middle",
>             of: "#container",
>             using: using
>           });
>         };
>      
>         $( "img:eq(0)" ).left();
>         $( "img:eq(1)" ).center();
>         $( "img:eq(2)" ).right();
>      
>         function animate( to ) {
>           $( this ).stop( true, false ).animate( to );
>         }
>         function next( event ) {
>           event.preventDefault();
>           $( "img:eq(2)" ).center( animate );
>           $( "img:eq(1)" ).left( animate );
>           $( "img:eq(0)" ).right().appendTo( "#container" );
>         }
>         function previous( event ) {
>           event.preventDefault();
>           $( "img:eq(0)" ).center( animate );
>           $( "img:eq(1)" ).right( animate );
>           $( "img:eq(2)" ).left().prependTo( "#container" );
>         }
>         $( "#previous" ).click( previous );
>         $( "#next" ).click( next );
>      
>         $( "img" ).click(function( event ) {
>           $( "img" ).index( this ) === 0 ? previous( event ) : next( event );
>         });
>      
>         $( window ).resize(function() {
>           $( "img:eq(0)" ).left( animate );
>           $( "img:eq(1)" ).center( animate );
>           $( "img:eq(2)" ).right( animate );
>         });
>       });
>       </script>
>     </head>
>     <body>
>      
>     <div id="container">
>       <img decoding="async" src="/wp-content/uploads/2014/03/earth.jpg" width="458" height="308" alt="earth">
>       <img decoding="async" loading="lazy" src="/wp-content/uploads/2014/03/flight.jpg" width="512" height="307" alt="flight">
>       <img decoding="async" loading="lazy" src="/wp-content/uploads/2014/03/rocket.jpg" width="300" height="353" alt="rocket">
>      
>       <a id="previous" href="#">上一个</a>
>       <a id="next" href="#">下一个</a>
>     </div>
>      
>      
>     </body>
>     </html>

[.position]: https://www.runoob.com/jqueryui/api-position.html