如何在nodeJs和Ajax中加载注释而不刷新页面

Question

我现在面临的实际挑战是如何正确加载注释。我的Ajax正在创建注释，但我很难将注释与其他注释一起正确加载。现在发生的情况是，注释加载了，但加载不正确，我很难在正确的位置用正确的ID加载它。加载时，它会显示我的标题和描述，而不会加载日期。

<div class="container">
<div class="row">
<div class="col-sm-6 col-sm-offset-3">
<h1>Comment App</h1>
<form action="/programs/<%= program._id %>/createComment" method="POST" >
<div class="form-group">
<input name="name" id="username" class="form-control" placeholder="username">
</div>
<div class="form-group">
<textarea name="description" id="descriptioncomment" class="form-control" placeholder="comment"></textarea>
</div>
<div class="form-group">
<input type="submit" id="post-comment" class="btn btn-primary" value="Submit">
</div>
</form>
<ul id="commentList" class="list-group">
</ul>
</div>
</div>
</div>
<section class="content-item" id="comments">
<div class="row"  id="comment-lists" >
<div class="col-sm-10" >
<h3 id="comments-count" ><%= program.programcomments.length%> </h3>
<% program.programcomments.forEach(comments=> { %>
<div class="media"  >

<div class="media-body" >
<h4 class="media-heading" id="lists"  ><%= comments.name %></h4>
<p id="lists" ><%=comments.description %></p>
<ul class="list-unstyled list-inline media-detail pull-left" id="lists">
<li id="lists"><i class="fa fa-calendar" ></i><%= moment(comments.createdAt).format('llll') %></li>
</ul>
</div>
</div>
<% });%>
</div>
</div>
</section>
$('#post-comment').on('click', function(event) {
event.preventDefault();


$.ajax({
url : "/programs/<%= program._id %>/createComment",
method : 'POST',
data : {
name : $('#username').val(),
description : $('#descriptioncomment').val()
},
success : function(result ) {
$('.form-control').each(function () {
let comments = this.value;
$('#comment-lists').append($('#lists').text(comments)) 
document.getElementById('comments-count').innerHTML++

});
$("#username").val('');
$("textarea#descriptioncomment.form-control").val('');
}
}); 
})  

Answer 1

您对mutliple元素使用相同的id，因此请首先删除它们并使用class。然后，您可以在ajax的成功函数中使用inputs的值生成整个mediadiv，然后将它们附加到您的comment-listsdiv中。

演示代码 :

$('#post-comment').on('click', function(event) {
event.preventDefault();

/*$.ajax({
url: "/programs/<%= program._id %>/createComment",
method: 'POST',
data: {
name: $('#username').val(),
description: $('#descriptioncomment').val()
},
success: function(result) {*/
//append new div .. with username & desc
$('#comment-lists').append(`<div class="media">
<div class="media-body">
<h4 class="media-heading">${$('#username').val()}</h4>
<p class="lists">${$('#descriptioncomment').val()}</p>
<ul class="list-unstyled list-inline media-detail pull-left lists">
<li><i class="fa fa-calendar"></i>${moment(new Date()).format('llll') }</li>
</ul>
</div>
</div>`)
$("#comments-count").text(parseInt($("#comments-count").text()) + 1) //updated total
//then emtpy
$("#username").val('');
$("textarea#descriptioncomment.form-control").val('');
/*}
});*/

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
<div class="container">
<div class="row">
<div class="col-sm-6 col-sm-offset-3">
<h1>Comment App</h1>
<form action="/programs/<%= program._id %>/createComment" method="POST">
<div class="form-group">
<input name="name" id="username" class="form-control" placeholder="username">
</div>
<div class="form-group">
<textarea name="description" id="descriptioncomment" class="form-control" placeholder="comment"></textarea>
</div>
<div class="form-group">
<input type="submit" id="post-comment" class="btn btn-primary" value="Submit">
</div>
</form>
<ul id="commentList" class="list-group">
</ul>
</div>
</div>
</div>
<section class="content-item" id="comments">
<div class="row" id="comment-lists">
<div class="col-sm-10">
<h3 id="comments-count">2</h3>
<div class="media">
<div class="media-body">
<h4 class="media-heading">Abc</h4>
<p class="lists">Descp xyz</p>
<ul class="list-unstyled list-inline media-detail pull-left lists">
<li><i class="fa fa-calendar"></i>23-2-2022</li>
</ul>
</div>
</div>
<div class="media">
<div class="media-body">
<h4 class="media-heading lists">Abc</h4>
<p class="lists">Descp xyz</p>
<ul class="list-unstyled list-inline media-detail pull-left lists">
<li><i class="fa fa-calendar"></i>23-2-2022</li>
</ul>
</div>
</div>
</div>
</div>
</section>