Multiline Text Truncation Plugin With jQuery - Dynamic Max Height

Dynamic Max Height is a jQuery multiline text truncating plugin for collapsing long blocks of text with a "Read more" link which allows you to expand the content with a CSS3 transition effect.

How to use it:

1. Add data-maxheight value to set the visible area.

<div class="dynamic-max-height" data-maxheight="70">
  <div class="dynamic-wrap">
    <p> Long Content Goes Here</p>
  </div>
  <div class="align-center">
    <a class="dynamic-show-more" href="javascript:;" title="Read more" 
       data-replace-text="Show less">
       Read more
    </a>
  </div>
</div>

2. Add the latest version of jQuery library and the Dynamic Max Height plugin to your webpage.

<script src="//code.jquery.com/jquery-2.2.0.min.js"></script>   
<script src="jquery.dynamicmaxheight.js"></script>

3. Initialize the plugin and define the trigger selector.

$('.dynamic-max-height').dynamicMaxHeight(
  { trigger : '.dynamic-show-more'}
);

4. Add CSS3 transitions to the text wrapper.

.dynamic-wrap {
  -webkit-transition: max-height 0.25s ease-in-out;
  -moz-transition: max-height 0.25s ease-in-out;
  transition: max-height 0.25s ease-in-out; 
  width: 100%;
  overflow: hidden;
  position: relative;
}

5. Add a bottom gradient to the text wrapper when collapsed.

.height-active .dynamic-wrap:before {
  content: '';
  position: absolute;
  left: 0px;
  right: 0;
  bottom: 0;
  height: 30px;
  background: -moz-linear-gradient(top, rgba(240,249,255,0) 0%, rgba(255,255,255,1) 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(240,249,255,0)), color-stop(100%, rgba(255,255,255,1)));
  background: -webkit-linear-gradient(top, rgba(240,249,255,0) 0%, rgba(255,255,255,1) 100%);
  background: -o-linear-gradient(top, rgba(240,249,255,0) 0%, rgba(255,255,255,1) 100%);
  background: -ms-linear-gradient(top, rgba(240,249,255,0) 0%, rgba(255,255,255,1) 100%);
  background: linear-gradient(to bottom, rgba(240,249,255,0) 0%, rgba(255,255,255,1) 100%);
 filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00f0f9ff', endColorstr='#ffffff', GradientType=0 );
  z-index: 1;
}

6. Style the read more and show less links.

.dynamic-max-height.height-active .dynamic-show-more { display: inline-block; }

.dynamic-max-height .dynamic-show-more {
  display: none;
  margin-top: 20px;
}

Change log:

2016-02-09

• Fix javascript init

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This awesome jQuery plugin is developed by JoanClaret. For more Advanced Usages, please check the demo page or visit the official website.