Question

我想在webforms中显示一个模态窗口。以下代码来自w3school，它可以正常工作，但在webforms中它的行为有所不同。模态确实出现了，但立即关闭了。

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm4.aspx.cs" Inherits="modal.WebForm4" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style>
/* The Modal (background) */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    padding-top: 100px; /* Location of the box */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}

/* Modal Content */
.modal-content {
    background-color: #fefefe;
    margin: auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
}

/* The Close Button */
.close {
    color: #aaaaaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}
</style>
</head>
<body>
    <form id="form1" runat="server">

    <div>
  <h2>Modal Example</h2>

   <asp:Button ID="myBtn" runat="server" Text="Button" type="button"  />
<!-- Trigger/Open The Modal -->
<button id="myBtn1" >Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- Modal content -->
  <div class="modal-content">
    <span class="close">×</span>
    <p>Some text in the Modal..</p>
  </div>

</div>

<script>
    // Get the modal
    var modal = document.getElementById('myModal');

    // Get the button that opens the modal
    var btn = document.getElementById("myBtn");

    // Get the <span> element that closes the modal
    var span = document.getElementsByClassName("close")[0];

    // When the user clicks the button, open the modal
    btn.onclick = function () {

        modal.style.display = "block";
    }

    // When the user clicks on <span> (x), close the modal
    span.onclick = function () {
        modal.style.display = "none";
    }

    // When the user clicks anywhere outside of the modal, close it
    window.onclick = function (event) {
        if (event.target == modal) {
            modal.style.display = "none";
        }
    }
</script>
    &nbsp;
    </div>

    </form>

       </body>
</html>

Answer 1

正如我之前提到的，因为您使用的是<form>标记，当您按下某个按钮时，它会尝试通过重新加载页面来提交表单。为了防止它单向提交，return false功能上的onclick

// When the user clicks the button, open the modal
btn.onclick = function () {

    modal.style.display = "block";
    return false;
}

// When the user clicks on <span> (x), close the modal
span.onclick = function () {
    modal.style.display = "none";
    return false;
}

Answer 2

你不能在javascript中分配这样的服务器端控件。改变你的代码。

<script>
    // Get the modal
    var modal = document.getElementById('myModal');

    // Get the button that opens the modal
    var btn = document.getElementById('<%=myBtn.ClientID%>');

    // Get the <span> element that closes the modal
    var span = document.getElementsByClassName("close")[0];

    // When the user clicks the button, open the modal
    btn.onclick = function () {

        modal.style.display = "block";
        return false;
    }

    // When the user clicks on <span> (x), close the modal
    span.onclick = function () {
        modal.style.display = "none";
    }

    // When the user clicks anywhere outside of the modal, close it
    window.onclick = function (event) {
        if (event.target == modal) {
            modal.style.display = "none";
        }
    }
</script>

Answer 3

我找到了办法。回发是模态退出的原因。解决方案是用更新面板将其括起来，问题就解决了。

模态显示但在c＃webforms中立即关闭

3 个答案: