依赖值（Dependent Values）

优质

小牛编辑

124浏览

2023-12-01

描述 (Description)

值与指定元素相互依赖。

例子 (Example)

以下示例显示Framework7中特定元素的相关值 -

<!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>Dependent values</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 = "pages">
               <div data-page = "home" class = "page navbar-fixed">
                  <div class = "navbar">
                     <div class = "navbar-inner">
                        <div class = "left"> </div>
                        <div class = "center">Picker</div>
                        <div class = "right"> </div>
                     </div>
                  </div>
                  <div class = "page-content">
                     <div class = "content-block-title">Dependent values</div>
                     <div class = "list-block">
                        <ul>
                           <li>
                              <div class = "item-content">
                                 <div class = "item-inner">
                                    <div class = "item-input">
                                       <input type = "text" placeholder = "Your car" 
                                          readonly id = "picker-dependent" />
                                    </div>
                                 </div>
                              </div>
                           </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>
      <style>
         .swiper-slide {
            background:#fff;
            box-sizing:border-box;
            border:1px solid #ccc;
            line-height:120px;
            text-align:center;
         }
         .swiper-slide span {
            font-size:17px;
         }
         .swiper-container {
            height:120px;
            margin:0px 0 35px;
         }
      </style>
      <style>
         #picker-date-container .picker-item {
            color:#999;
         }
         #picker-date-container .picker-selected {
            color:#000;
         }
         @media (max-width: 767px) { 
            #picker-date-container .picker-items {
               font-size:21px;
            }
            #picker-date-container .picker-item {
               height:36px;
               line-height:36px;
               padding:0 6px;
            }
         }
      </style>
      <script>
         var myApp = new Framework7();
         // Dependent values
         var carVendors = {
            Japanese : ['Honda', 'Lexus', 'Mazda', 'Nissan', 'Toyota'],
            German : ['Audi', 'BMW', 'Mercedes', 'Volkswagen', 'Volvo'],
            American : ['Cadillac', 'Chrysler', 'Dodge', 'Ford']
         };
         var pickerDependent = myApp.picker({
            input: '#picker-dependent',
            rotateEffect: true,
            formatValue: function (picker, values) {
               return values[1];
            },
            cols: [
               {
                  textAlign: 'left',
                  values: ['Japanese', 'German', 'American'],
                  onChange: function (picker, country) {
                     if(picker.cols[1].replaceValues){
                        picker.cols[1].replaceValues(carVendors[country]);
                     }
                  }
               },
               {
                  values: carVendors.Japanese,
                  width: 160,
               },
            ]
         });
      </script>
   </body>
</html>

输出 (Output)

让我们执行以下步骤，看看上面给出的代码是如何工作的 -

将上面给出的HTML代码保存为您的服务器根文件夹中的dependent_values.html文件。
以http://localhost/dependent_values.html打开此HTML文件，输出显示如下。
该示例允许您为指定的元素选择相关值。旋转元素时，您将获得它的相关值。