当我点击＆＃34;显示更多＆＃34;它还显示另一个框的文本。我不知道逻辑错误在哪里或我做错了什么。我不能一次只影响一个元素。在示例中有2个框，但它们将有更多。
var content = $('.card-text');
var moretext = "Show more ❯";
var lesstext = "Show less";
content.each(function(){
if ($(this).text().length > 83) {
$(this).addClass('truncate-ellipsis');
$(this).after( '<a href="" class="readmore-link">' + moretext + '</a>' );
}
});
$('.readmore-link').on('click', function(b){
b.preventDefault();
if(content.hasClass("truncate-ellipsis")) {
content.removeClass("truncate-ellipsis");
$(this).html(lesstext);
$(this).attr('class','readmore-link');
} else{
content.addClass("truncate-ellipsis");
$(this).html(moretext);
}
return false;
});.truncate-ellipsis{
display: block;
display: -webkit-box;
height: 60px;
text-overflow: ellipsis;
overflow: hidden;
-webkit-line-clamp: 3;
-webkit-box-orient: vertical;
}
.readmore-link{
color:blue;
}<html lang="en">
<head>
<meta charset="UTF-8">
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<div class="col-sm-6 col-md-4 col-lg-3 mt-4">
<div class="card">
<img class="card-img-top" src="http://www.sky-valley-web-design.com/images/250x150.gif">
<div class="card-block">
<h4 class="card-title">CNN</h4>
<div class="meta">
<a href="#">News1</a>
</div>
<div class="card-text">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ra
</div>
</div>
</div>
</div>
<div class="col-sm-6 col-md-4 col-lg-3 mt-4">
<div class="card">
<img class="card-img-top" src="http://www.sky-valley-web-design.com/images/250x150.gif">
<div class="card-block">
<h4 class="card-title">BBC</h4>
<div class="meta">
<a href="#">News 1</a>
</div>
<div class="card-text">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec
</div>
</div>
</div>
</div>
</body>
答案 0 :(得分：1)
在您的点击功能中，将content替换为$(this).prev()，以仅引用相对的文本块。当你在那里使用它时，content是陈旧的，并且会引用所有文本块。
var content = $('.card-text');
var moretext = "Show more ❯";
var lesstext = "Show less";
content.each(function() {
if ($(this).text().length > 83) {
$(this).addClass('truncate-ellipsis');
$(this).after('<a href="" class="readmore-link">' + moretext + '</a>');
}
});
$('.readmore-link').on('click', function(b) {
b.preventDefault();
if ($(this).prev().hasClass("truncate-ellipsis")) {
$(this).prev().removeClass("truncate-ellipsis");
$(this).html(lesstext);
$(this).attr('class', 'readmore-link');
} else {
$(this).prev().addClass("truncate-ellipsis");
$(this).html(moretext);
}
return false;
});.truncate-ellipsis {
display: block;
display: -webkit-box;
height: 60px;
text-overflow: ellipsis;
overflow: hidden;
-webkit-line-clamp: 3;
-webkit-box-orient: vertical;
}
.readmore-link {
color: blue;
}<html lang="en">
<head>
<meta charset="UTF-8">
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<div class="col-sm-6 col-md-4 col-lg-3 mt-4">
<div class="card">
<img class="card-img-top" src="http://www.sky-valley-web-design.com/images/250x150.gif">
<div class="card-block">
<h4 class="card-title">CNN</h4>
<div class="meta">
<a href="#">News1</a>
</div>
<div class="card-text">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem
quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ra
</div>
</div>
</div>
</div>
<div class="col-sm-6 col-md-4 col-lg-3 mt-4">
<div class="card">
<img class="card-img-top" src="http://www.sky-valley-web-design.com/images/250x150.gif">
<div class="card-block">
<h4 class="card-title">BBC</h4>
<div class="meta">
<a href="#">News 1</a>
</div>
<div class="card-text">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium
quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec
</div>
</div>
</div>
</div>
</body>
答案 1 :(得分：0)
CStr是问题，您不应该全局使用它。在click函数中，您必须使用另一个变量，例如var content = $('.card-text');
contentCurr = $(this).prev('div.card-text');var content = $('.card-text');
var moretext = "Show more ❯";
var lesstext = "Show less";
content.each(function() {
if ($(this).text().length > 83) {
$(this).addClass('truncate-ellipsis');
$(this).after('<a href="" class="readmore-link">' + moretext + '</a>');
}
});
$('.readmore-link').on('click', function(b) {
b.preventDefault();
contentCurr = $(this).prev('div.card-text');
console.log('dsd',contentCurr);
if (contentCurr.hasClass("truncate-ellipsis")) {
contentCurr.removeClass("truncate-ellipsis");
$(this).html(lesstext);
$(this).attr('class', 'readmore-link');
} else {
contentCurr.addClass("truncate-ellipsis");
$(this).html(moretext);
}
return false;
});.truncate-ellipsis {
display: block;
display: -webkit-box;
height: 60px;
text-overflow: ellipsis;
overflow: hidden;
-webkit-line-clamp: 3;
-webkit-box-orient: vertical;
}
.readmore-link {
color: blue;
}