如何在用户向下滚动或放弃崩溃时关闭boostrap崩溃

Question

这是我目前用来触发它的     获得免费报价 那么这就是html代码

<div id="demo" class="collapse">
    <br><br><br><br><br><br><br><br>
    <div class="wrap-type-input">
        <form id="get_free_quote" class="contact-form" method="post" action="contact/contact-process.php">        
            <div class="input-wrap name">
                <input type="text" value="" tabindex="1" placeholder="Name (*)" name="name" id="name" required="">
            </div>
            <div class="input-wrap name">
                <input type="text" min="0" value="" accept="*/phone" tabindex="1" placeholder="Phone (*)" name="phone" id="name" required="">
            </div>
            <div class="input-wrap email">
                <input type="email" value="" tabindex="2" placeholder="Email (*)" name="email" id="email" required="">
            </div>  
            <div class="textarea-wrap">
                <textarea class="type-input" tabindex="3" placeholder="Items you Need" name="message" id="message-contact" required=""></textarea>
            </div>  
            <div class="subscribe">
                <button type="submit" id="submit" class="button" name="submit">Send Message</button>
            </div> 
        </form>                          
    </div>
</div>

我真的很感激回答