Bootstrap4 麵包屑導航+表單+輸入框組+自定義表單

Bootstrap4 麵包屑導航（Breadcrumb）

<ul class="breadcrumb">
    <li class="breadcrumb-item"><a href="#">item1</a></li>
    <li class="breadcrumb-item"><a href="#">item2</a></li>
    <li class="breadcrumb-item"><a href="#">item3</a></li>
</ul>

也可以不用列表形式

<nav class="breadcrumb">
    <a href="#" class="breadcrumb-item">item1</a>
    <a href="#" class="breadcrumb-item">item2</a>
    <a href="#" class="breadcrumb-item">item3</a>
</nav>

Bootstrap4 表單

堆疊表單

<form action="">
    <div class="form-group">
        <label for="">username</label>
        <input type="text" class="form-control">
    </div>
    <div class="form-group">
        <label for="">password</label>
        <input type="password" class="form-control">
    </div>
</form>

內聯表單

所有內聯表單中的元素都是左對齊的。
註意：在屏幕寬度小於 576px 時為垂直堆疊，如果屏幕寬度大於等於576px時表單元素才會顯示在同一個水平線上

<form class="form-inline">
    <div class="form-group">
        <label for="">username</label>
        <input type="text" class="form-control">
    </div>
    <div class="form-group">
        <label for="">password</label>
        <input type="password" class="form-control">
    </div>
</form>

Bootstrap4 輸入框組

<form>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text">@</span>
        </div>
        <input type="email">
    </div>
    <div class="input-group mb-3">        
        <input type="email">
        <div class="input-group-append">
            <span class="input-group-text">@qq.com</span>
        </div>
    </div>
</form>

文本信息可以使用覆選框與單選框替代

<form>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <div class="input-group-text">
                <input type="checkbox" name="" id="">
            </div>
        </div>
        <input type="email">
    </div>
    <div class="input-group mb-3">        
        <input type="email">
        <div class="input-group-append">
            <div class="input-group-text">
                <input type="radio" name="" id="">
            </div>
        </div>
    </div>
</form>

輸入框添加按鈕組

<form>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <button type="button" class="btn btn-primary">提交</button>
        </div>
        <input type="email">
    </div>
    <div class="input-group mb-3">        
        <input type="email">
        <div class="input-group-append">
            <button type="submit" class="btn btn-primary">提交</button>
        </div>
    </div>
</form>

輸入框中添加下拉菜單

<form>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">提交</button>
            <div class="dropdown-menu">
                <a href="#" class="dropdown-item">item1</a>
                <a href="#" class="dropdown-item">item2</a>
                <a href="#" class="dropdown-item">item3</a>
            </div>    
        </div>    
        <input type="email">
    </div>
</form>

輸入框組標簽

<form>
    <label for="email">write your email here:</label>
    <div class="input-group mb-3">        
        <input type="email" id="email">
        <div class="input-group-append">
            <span class="input-group-text">@qq.com</span>
        </div>    
    </div>
</form>

Bootstrap4 自定義表單

自定義覆選框

<form>
    <div class="custom-control custom-checkbox">
        <input type="checkbox" name="hobby" id="hobby" class="custom-control-input">
        <label for="hobby" class="custom-control-label">hobby</label>
    </div>
</form>

自定義單選框

<form>
    <div class="custom-control custom-radio">
        <input type="radio" name="hobby" id="hobby" class="custom-control-input">
        <label for="hobby" class="custom-control-label">hobby</label>
    </div>
</form>

自定義下拉選擇菜單

<form>
    <select name="" id="" class="custom-select-sm">
        <option selected>請選擇</option>
        <option value="1">item1</option>
        <option value="2">item2</option>
        <option value="3">item3</option>
    </select>
</form>

自定義滑塊控制項

<form>
    <label for="range">range</label>
    <input type="range" class="custom-range" />
</form>

<form>
    <div class="custom-file" style="width:200px;">
        <label for="file" class="custom-file-label">選擇文件</label>
        <input type="file" class="custom-file-input" input="file" />
    </div>
</form>

總結一下，自定義表單控制項比預設的表單控制項顏值更高！