在Bootstrap Drop Down中设置默认值 [英] Setting Default Value in Bootstrap Drop Down

问题描述

我正在使用Bootstrap构建应用程序。在这个应用程序中，我有一个控件，可以转换英制和公制值之间的值。为实现此目的，我目前有以下内容：

I am building an app with Bootstrap. In this app, I have a control that converts a value between imperial and metric values. To accomplish this, I currently have the following:

<div class="input-group">
  <input type="text" class="form-control">
  <div class="input-group-btn">
    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Action <span class="caret"></span>  
    </button>
    <ul class="dropdown-menu dropdown-menu-right" role="menu">
      <li><a href="#" data-type="lb">Pounds</a></li>
      <li><a href="#" data-type="kg">Kilograms</a></li>
    </ul>
  </div>
  <input id="theValue" type="hidden" data-start-type="kg" />
</div>

当控件 theValue 元素填充自服务器，它将是lb或kg。我想这样做，以便在页面最初加载时，所选菜单选项基于 theValue 的值。换句话说，我不希望看到文本动作。相反，我需要在视图加载时选择Pounds或Kilograms。

When the control theValue element is populated from the server, it will either be "lb" or "kg". I want to make it so that the selected menu option is based on the value of theValue when the page initially loads. In other words, I do not want to see the text "Action". Instead, I need to select either Pounds or Kilograms when the view loads.

如何从jQuery执行此操作？

How do I do this from jQuery?

推荐答案

使用jQuery，您可以选择 theValue 元素，访问其 data-start-type 属性，找到具有相同数据类型属性的 a 元素，然后使用它 text 设置按钮文本的值。你需要一种独特的方法来识别jQuery中的选择按钮，所以给它一个 id ;我用过actionButton。

Using jQuery, you would select the theValue element, access its data-start-type attribute, find the a element with the same data-type attribute, and then use its text value to set the text of the button. You'll want a unique way to identify the button for selection in jQuery, so give it an id; I used "actionButton".

$(document).ready(function(){
    var data_start_type = $('#theValue').attr('data-start-type');
    var $data_type_elem = $('[data-type='+data_start_type+']');
    $('#actionButton').text($data_type_elem.text());
});

这是一个jsFiddle： http://jsfiddle.net/7g9k2dwx/

Here's a jsFiddle: http://jsfiddle.net/7g9k2dwx/

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