Html 输入组中有多个按钮

我正在尝试实现一个输入组，该输入组在左侧有多个按钮，现在只有一个按钮在右侧，如图所示：

问题是，只要每侧有一个以上的按钮，输入字段就会调整为最大宽度，并在较小的显示器上弹出一个按钮：

左侧只有一个按钮，右侧只有一个按钮，它在所有屏幕尺寸上都能100%工作：

Le代码：

    <div class="input-group br">
        <span class="input-group-btn">
            <div class="btn-group">
                <a href="#" class="btn btn-primary clear-search">
                    <span class="glyphicon glyphicon-refresh"></span>
                </a>
                <a href="#" class="btn btn-primary qr-code">
                    <span class="glyphicon glyphicon-qrcode"></span>
                </a>
            </div>
        </span>
        <input class="form-control search" type="search" name="search" placeholder="Search">
        <span class="input-group-btn">
            <div class="btn-group dropup">
                <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    <span class="glyphicon glyphicon-search"></span>
                    Search
                    <span class="caret"></span>
                </button>
                <ul class="dropdown-menu dropdown-menu-right">
                    <li><a class="buyer-identifier" href="#">Buyer Number</a></li>
                    ...
                    <li class="divider"></li>
                    <li><a class="clear-search" href="#">Clear Search</a></li>
                </ul>
            </div>
        </span>
    </div>

搜寻


...

---

关于如何使第一个图像适用于所有屏幕大小，您有什么想法吗？

不要使用两个按钮组包装器元素

<div class="input-group br"> <span class="input-group-btn">
    <a href="#" class="btn btn-primary clear-search">
        <span class="glyphicon glyphicon-refresh"></span>
    </a> 
    <a href="#" class="btn btn-primary qr-code">
        <span class="glyphicon glyphicon-qrcode"></span>
    </a>

---

您不需要

btn组

元素

    <div class="input-group br">
        <span class="input-group-btn">
            <a href="#" class="btn btn-primary clear-search">
              <span class="glyphicon glyphicon-refresh"></span>
          </a>
          <a href="#" class="btn btn-primary qr-code">
            <span class="glyphicon glyphicon-qrcode"></span>
          </a>
        </span>
        <input class="form-control search" type="search" name="search" placeholder="Search">
        <span class="input-group-btn">
            <div class="btn-group dropup">
                <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    <span class="glyphicon glyphicon-search"></span>
                    Search
                    <span class="caret"></span>
                </button>
                <ul class="dropdown-menu dropdown-menu-right">
                    <li><a class="buyer-identifier" href="#">Buyer Number</a></li>
                    ...
                    <li class="divider"></li>
                    <li><a class="clear-search" href="#">Clear Search</a></li>
                </ul>
            </div>
        </span>
    </div>

搜寻


...

---

使用btn中学课程

<div class="input-group">
  <input type="text" class="form-control" aria-label="Text input with segmented button dropdown">
  <div class="input-group-btn">
    <button type="button" class="btn btn-secondary">☺</button>
    <button type="button" class="btn btn-secondary">SEND</button>
  </div>
</div>

☺
发送

这是Bootstrap 4吗？我不确定这是否与这个问题有关。