Bootstrap 4：使用多個時無法關閉模態

Question

我目前正在嘗試在 Bootstrap 4 中設置一個畫廊。現在我想讓圖像可點擊並打開它的更大版本。 這工作正常，但是一旦我使用多個腳本，它就不會讓我再關閉模態。

到目前為止，這是我的代碼：

<div id="Modal01" class="modal">
   <span class="close">&times;</span>
   <img class="modal-content" id="img01">
 </div>
  <div class="col-md-3">
    <div class="thumbnail">
        <img id="TheImage" src="/img/galleryimg1.png">
    </div>
  </div>

JS：

<script>
  var modal = document.getElementById('Modal01');

  var img = document.getElementById('TheImage');
  var modalImg = document.getElementById("img01");
  img.onclick = function(){
      modal.style.display = "block";
      modalImg.src = this.src;
      captionText.innerHTML = this.alt;
  }
  var span = document.getElementsByClassName("close")[0];
  span.onclick = function() {
    modal.style.display = "none";
  }
</script>

希望你們能幫幫我。

Answer 1

實現該畫廊功能的最簡單方法是使用 Bootstrap 提供的 javascript 庫。 這樣，您的標記和腳本就可以像下面的示例一樣簡單。 您也可以在 Bootstrap 文檔的Varying modal content部分下閱讀有關此設置的更多信息。

 $('#gallery-modal').on('show.bs.modal', function(event) { var thumbnail = event.relatedTarget, title = thumbnail.alt, src = thumbnail.src, modal = $(this); modal.find('.modal-title').text(title); modal.find('.img-placeholder').attr('src', src); });

 <div id="gallery" class="container"> <div class="row"> <div class="col-4"> <img class="img-fluid img-thumbnail" data-toggle="modal" data-target="#gallery-modal" src="http://via.placeholder.com/800x450/ff0000/ffffff?text=Image+1" alt="Image 1"/> </div> <div class="col-4"> <img class="img-fluid img-thumbnail" data-toggle="modal" data-target="#gallery-modal" src="http://via.placeholder.com/800x450/00ff00/ffffff?text=Image+2" alt="Image 2"/> </div> <div class="col-4"> <img class="img-fluid img-thumbnail" data-toggle="modal" data-target="#gallery-modal" src="http://via.placeholder.com/800x450/0000ff/ffffff?text=Image+3" alt="Image 3"/> </div> </div> </div> <div id="gallery-modal" class="modal" tabindex="-1" role="dialog"> <div class="modal-dialog modal-lg" role="document"> <div class="modal-content"> <div class="modal-header"> <h5 class="modal-title"></h5> <button type="button" class="close" data-dismiss="modal" aria-label="Close"> <span aria-hidden="true">&times;</span> </button> </div> <div class="modal-body"> <img class="img-placeholder img-fluid" src=""/> </div> <div class="modal-footer"> <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button> </div> </div> </div> </div> <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" rel="stylesheet"/> <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>

在不太可能的情況下，您想完全忽略bootstrap.js和 jQuery 提供的功能，並且想提出純 javascript 自定義解決方案，您絕對不應該對每個縮略圖重復相同的代碼。 我假設您正在嘗試這樣做，並且當您在代碼中使用全局變量時，它們會被覆蓋。 相反，您應該處理模態功能並以更通用的方式附加事件處理程序。 我不建議采用這種方法，但只是為了這個想法，這里是一個純 javascript 的例子。

 // Basic Modal object var Modal = function() { var modal = document.getElementById('gallery-modal'), title = modal.querySelector('.modal-title'), img = modal.querySelector('.img-placeholder'), closeBtns = modal.querySelectorAll('[data-dismiss="modal"]'), bodyClassList = document.querySelector('body').classList; function show(title, src) { title.innerText = title; img.src = src; bodyClassList.add('modal-open'); modal.style.display = 'block'; } function hide() { bodyClassList.remove('modal-open'); modal.style.display = 'none'; title.innerText = ''; img.src = ''; } // Handling `click` on "close" buttons [...closeBtns].forEach(closeBtn => { closeBtn.addEventListener('click', hide); }); return { show : show, }; }(); // Handling `click` events on thumbnails [...document.querySelectorAll('#gallery .img-thumbnail')].forEach(thumbnail => { thumbnail.addEventListener('click', function() { // `this` is the <img> clicked var title = this.alt, src = this.src; // Modal is the global Modal object Modal.show(title, src); }); });

 <div id="gallery" class="container"> <div class="row"> <div class="col-4"> <img class="img-fluid img-thumbnail" data-toggle="modal" data-target="#gallery-modal" src="http://via.placeholder.com/800x450/ff0000/ffffff?text=Image+1" alt="Image 1"/> </div> <div class="col-4"> <img class="img-fluid img-thumbnail" data-toggle="modal" data-target="#gallery-modal" src="http://via.placeholder.com/800x450/00ff00/ffffff?text=Image+2" alt="Image 2"/> </div> <div class="col-4"> <img class="img-fluid img-thumbnail" data-toggle="modal" data-target="#gallery-modal" src="http://via.placeholder.com/800x450/0000ff/ffffff?text=Image+3" alt="Image 3"/> </div> </div> </div> <div id="gallery-modal" class="modal" tabindex="-1" role="dialog"> <div class="modal-dialog modal-lg" role="document"> <div class="modal-content"> <div class="modal-header"> <h5 class="modal-title"></h5> <button type="button" class="close" data-dismiss="modal" aria-label="Close"> <span aria-hidden="true">&times;</span> </button> </div> <div class="modal-body"> <img class="img-placeholder img-fluid" src=""/> </div> <div class="modal-footer"> <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button> </div> </div> </div> </div> <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" rel="stylesheet"/>

Answer 2

目前與

<div class="modal-backdrop fade show"></div>

之后你可以嘗試使用css

body.modal-open .modal{
    z-index: 0;
}
body.modal-open .modal.fade.show{
    z-index: 1041;
}