Framework7 - 多选和最大长度限制

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描述

智能选择允许使用`maxlength`属性选择有限数量的项目。

示例

以下示例演示了在 Framework7 中选择项目时，对可选择项目数量的限制：

<!DOCTYPE html>
<html>

   <head>
      <meta name = "viewport" content = "width = device-width, initial-scale = 1, 
         maximum-scale = 1, minimum-scale = 1, user-scalable = no, minimal-ui" />
      <meta name = "apple-mobile-web-app-capable" content = "yes" />
      <meta name = "apple-mobile-web-app-status-bar-style" content = "black" />
      <title>Multiple Select and Maxlength</title>
      <link rel = "stylesheet" 
         href = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/css/framework7.ios.min.css" />
      <link rel = "stylesheet" 
         href = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/css/framework7.ios.colors.min.css" />
   </head>

   <body>
      <div class = "views">
         <div class = "view view-main">
            
            <div class = "navbar">
               <div class = "navbar-inner">
                  <div class = "left"> </div>
                  <div class = "center sliding">Multiple Select and Maxlength</div>
                  <div class = "right"> </div>
               </div>
            </div>
            
            <div class = "pages navbar-through">
               <div data-page = "home" class = "page">
                  <div class = "page-content">
                     <div class = "list-block">
                        <ul>
                           <li>
                              <a href = "#" class = "item-link smart-select">
                              
                                 <select name = "car" multiple maxlength = "4">
                                    <optgroup label = "India">
                                       <option value = "delhi" selected>Delhi</option>
                                       <option value = "mumbai">Mumbai</option>
                                       <option value = "bangalore">Bangalore</option>
                                    </optgroup>
                                    
                                    <optgroup label = "United Kingdom">
                                       <option value = "london">London</option>
                                       <option value = "belfast">Belfast</option>
                                       <option value = "wells">Wells</option>
                                    </optgroup>
                                    
                                    <optgroup label = "Australia">
                                       <option value = "sydney">Sydney</option>
                                       <option value = "perth">Perth</option>
                                       <option value = "melbourne">Melbourne</option>
                                    </optgroup>
                                 </select>
                                 
                                 <div class = "item-content">
                                    <div class = "item-inner">
                                       <div class = "item-title">Cities</div>
                                    </div>
                                 </div>
                              </a>
                           </li>
                        </ul>
                     </div>
                  </div>
                  
               </div>
            </div>
         </div>
      </div>
      
      <script type = "text/javascript" 
         src = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/js/framework7.min.js"></script>
         
      <script>
         // here initialize the app
         var myApp = new Framework7({
            animateNavBackIcon:true
         });

         // If your using custom DOM library, then save it to $$ variable
         var $$ = Dom7;

         // Add the view
         var mainView = myApp.addView('.view-main', {
         
            // enable the dynamic navbar for this view
            dynamicNavbar: true
         });
      </script>
   </body>

</html>

输出

让我们执行以下步骤来查看上述代码是如何工作的：

  • 将上述HTML代码保存为`smart_select_multiple_maxlength.html`文件，保存在服务器根目录下。

  • 在浏览器中打开此HTML文件，地址为：https://127.0.0.1/smart_select_multiple_maxlength.html，输出结果如下所示。

  • 此处最大长度设置为4。当您点击“城市”选项时，您可以看到每个城市的不同的选项，您最多只能选择四个选项。

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