如何在使用jquery加载页面时打开弹出窗口？

问题描述：

如何在页面加载时打开弹出窗口？

How to open a pop up when page loads?

我希望在页面加载时弹出选择下拉框。

I want to my select drop down box as popup when page loads.

以下是我的HTML代码：

Below is my HTML code:

<div class="UserData">
    <h1><a href="moviebooking.html">Booking</a></h1>

    <select class="selectCity" id="selectCity" style="display:none;">
        <option value="City">Select City</option>
        <option value="Bengaluru">Bengaluru</option>
        <option value="Hyderabad">Hyderabad</option>
        <option value="Guntur">Guntur</option>
        <option value="Ongole">Ongole</option>
    </select>

    <span id="welcome"> </span>
</div>

答

如果您希望它显示为弹出窗口，则全部你需要做的就是用一些基本的 CSS 来设置它，并用一些 JavaScript 添加一些功能。

If you want it to show as a popup, all you need to do is style it so with some basic CSS and add some functionality with some JavaScript.

代码段

/* ----- JavaScript ----- */
window.onload = function () {
  /* Cache the popup. */
  var popup = document.getElementById("popup");
  
  /* Show the popup. */
  popup.classList.remove("hidden");
  
  /* Fade the popup in */
  setTimeout(()=>popup.classList.add("fade-in"));
  
  /* Close the popup when a city is selected. */
  document.getElementById("selectCity").onchange = function () {
     /* Fade the popup out */
     popup.classList.remove("fade-in");
     
     /* Hide the popup. */
     setTimeout(()=>popup.classList.add("hidden"), 300);
  };
};

/* ----- CSS ----- */
#popup {
  display: inline-block;
  opacity: 0;
  position: fixed;
  top: 20%;
  left: 50%;
  padding: 1em;
  transform: translateX(-50%);
  background: #fff;
  border: 1px solid #888;
  box-shadow: 1px 1px .5em 0 rgba(0, 0, 0, .5);
  transition: opacity .3s ease-in-out;
}

#popup.hidden {
  display: none;
}
#popup.fade-in {
  opacity: 1;
}

<!----- HTML ----->
<div id = "popup" class = "hidden">
  <select class="selectCity" id="selectCity">
    <option value="City">Select City</option>
    <option value="Bengaluru">Bengaluru</option>
    <option value="Hyderabad">Hyderabad</option>
    <option value="Guntur">Guntur</option>
    <option value="Ongole">Ongole</option>
  </select>
</div>

注意：
上面提供的示例使用最少的代码，因此功能最少。如果您不想从头开始创建弹出窗口的功能和外观，则可以始终使用外部库。以下是使用 jQuery 和 Bootstrap ：

代码段

/* ----- JavaScript ----- */
$(function () {
  $("#custom-modal").modal("show");
});

/* Close the popup when the a selection is made */
$("#selectCity").on("change", function () {
  $("#custom-modal").modal("hide");
});

<!-- Libraries -->
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"/>
<script src="//ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<!-- A Bootstrap Modal -->
<div id="custom-modal" class="modal fade" role="dialog">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h4 class="modal-title">Select City</h4>
      </div>
      <div class="modal-body">
        <select class="selectCity" id="selectCity">
          <option value="City" disabled>Select City</option>
          <option value="Bengaluru">Bengaluru</option>
          <option value="Hyderabad">Hyderabad</option>
          <option value="Guntur">Guntur</option>
          <option value="Ongole">Ongole</option>
        </select>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Dismiss</button>
      </div>
    </div>
  </div>
</div>

如何在使用jquery加载页面时打开弹出窗口？

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