jQuery UI 实例 - 定位（Position） · W3School jQuery UI 教程

# jQuery UI 实例 - 定位（Position）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()](api-position.html)。 ## 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 src="img/earth.jpg" width="458" height="308" alt="earth"> <img src="img/flight.jpg" width="512" height="307" alt="flight"> <img src="img/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> ```