佔位符可篩選下拉選單

描述

佔位符指定說明期望值的簡短提示。

示例

以下示例演示了在 jQuery Mobile 中使用 placeholder filterable selectmenu。

<!DOCTYPE html>
<html>
   <head>
      <meta name = "viewport" content = "width = device-width, initial-scale = 1">
      <link rel = "stylesheet" href = "https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css">
      <script src = "https://code.jquery.com/jquery-1.11.3.min.js"></script>
      <script src = "https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
      
      <script>
         $.mobile.document
         .on( "selectmenucreate", ".filterable-select", function( event ) {
            var input,
            selectmenu = $( event.target ),
            list = $( "#" + selectmenu.attr( "id" ) + "-menu" ),
            form = list.jqmData( "filter-form" );
            
            if ( !form ) {
               input = $( "<input data-type='search'></input>" );
               form = $( "<form></form>" ).append( input );
               input.textinput();
               list
               .before( form )
               .jqmData( "filter-form", form ) ;
               form.jqmData( "listview", list );
            }
            
            selectmenu
            .filterable({
               input: input,
               children: "> option[value]"
            })
            
            .on( "filterablefilter", function() {
               selectmenu.selectmenu( "refresh" );
            });
         })
      </script>
   </head>
   
   <body>
      <h2>Filter Placeholder Selectmenu Example</h2>
      <form>
         <div class = "ui-field-contain">
            <label for = "filter">Basic:</label>
            
            <select id = "filter" data-native-menu = "false" class = "filterable-select">
               <option>Select City</option>
               <option value = "de">Delhi</option>
               <option value = "pu">Punjab</option>
               <option value = "ch">Chennai</option>
               <option value = "mu">Mumbai</option>
            </select>
            
         </div>
      </form>
   </body>
</html>

輸出

讓我們執行以下步驟以瞭解上面的程式碼如何工作：

將上述 HTML 程式碼另存為伺服器根資料夾中的 selectmenu_filter_placeholder.html 檔案。
開啟 HTML 檔案 https:///selectmenu_filter_placeholder.html 將顯示以下輸出。

jquery_mobile_widgets.htm

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