Modal在c#webforms中显示但立即关闭

本文关键字：显示 c#webforms Modal | 更新日期: 2023-09-27 17:58:33

我想在web表单中显示一个模式窗口。以下代码来自w3school，运行良好，但在网络表单中表现不同。模态确实出现了，但立即关闭。

<%@ 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>

Modal在c#webforms中显示但立即关闭

正如我所提到的，因为您使用的是<form>标记，当您按下按钮时，它将尝试通过重新加载页面来提交表单。为了防止它提交绕过它的一种方法是在您的onclick函数上向return false提交

// 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;
}

在javascript中，不能像这样分配服务器端控件。更改代码。

<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>

我确实找到了办法。后置是模态退出的原因。解决方案是用更新面板将其封装起来，问题就解决了。

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