模式弹出是不是在asp.net

Question

显示我试图让在asp.net一个模式弹出（只是CSS和JS），但是当单击该按钮。背景显示并关闭非常快。和模式不显示。这是代码。

asp.net

<!-- Trigger/Open The Modal --> 
<button id="myBtn">Open Modal</button> 

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

    <!-- Modal content --> 
    <div class="modal-content"> 
    <div class="modal-header"> 
     <span class="close">×</span> 
     <h2>Modal Header</h2> 
    </div> 
    <div class="modal-body"> 
     <p>Some text in the Modal Body</p> 
     <p>Some other text...</p> 
    </div> 
    <div class="modal-footer"> 
     <h3>Modal Footer</h3> 
    </div> 
    </div> 

</div> 

CSS：

/* 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 { 
    position: relative; 
    background-color: #fefefe; 
    margin: auto; 
    padding: 0; 
    border: 1px solid #888; 
    width: 80%; 
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19); 
    -webkit-animation-name: animatetop; 
    -webkit-animation-duration: 0.4s; 
    animation-name: animatetop; 
    animation-duration: 0.4s 
} 

/* Add Animation */ 
@-webkit-keyframes animatetop { 
    from {top:-300px; opacity:0} 
    to {top:0; opacity:1} 
} 

@keyframes animatetop { 
    from {top:-300px; opacity:0} 
    to {top:0; opacity:1} 
} 

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

.close:hover, 
.close:focus { 
    color: #000; 
    text-decoration: none; 
    cursor: pointer; 
} 

.modal-header { 
    padding: 2px 16px; 
    background-color: #5cb85c; 
    color: white; 
} 

.modal-body {padding: 2px 16px;} 

.modal-footer { 
    padding: 2px 16px; 
    background-color: #5cb85c; 
    color: white; 
} 

JavaScript的：

<script type="text/javascript"> 
// 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> 

，但它不工作。我在这里跟着这个tuttorial：W3Schools 编辑：我删除的文档片断，因为代码只是太大，只是重复了一遍自己。还发布了该页面，您可以在此处进行测试。 http://detos.azurewebsites.net/Test.aspx

模态关闭它自1秒后

Answer 1

我不知道如果我允许张贴的答案为我的帖子。但我发现错误。

不知何故在asp.net点击一个按钮，当它刷新页面。并更改该按钮后，它完美地工作。

Answer 2

尝试删除这段代码，我认为这就是问题所在

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