Clampify

Pure js plugin for truncate multi line text with fixed number of lines.

Installation

Via NPM

npm install clampify --save

or via bower

bower install clampify.js --save

Usage

Initialization

Let's say we have such html layout. Supposed that container is block element and content is inline

<style>
    #demo {
        width: 50%;
        margin: auto;
        line-height: 1.2em;
        /* 
         * Allows to display maximum 5 lines
         * 1.2em * 5
         */
        max-height: 6em;
        overflow: hidden;
    }
</style>
<div id="demo">
    Lorem <b>ipsum dolor</b> sit amet, 
    <a href="#">consectetur <i>adipiscing elit</i></a>, sed do eiusmod tempor 
    incididunt ut labore et dolore magna aliqua. 
    Ut enim ad minim <span class="custom-class">veniam, quis nostrud exercitation 
    ullamco <i>laboris nisi ut aliquip ex</i> ea commodo consequat. 
    <b>Duis aute irure dolor in</b> </span>reprehenderit in voluptate 
    velit esse cillum dolore eu fugiat nulla pariatur.
</div>

We can initialize clampify using vanilla js

var element = document.getElementById('demo');
$clampify(element, {
       // Options
   });

// You can access Clampify instance via clampify property
// element.clampify.resetContent();

or via jQuery

$('#demo').clampify({
    // options
});

// You can also call methods of Clampify instance via jQuery
// $('#demo').clampify('resetContent')

Clampify class instance is stored in element property clampify

Options

Option	Type	Default	Description
maxLines	int	0	Number of max lines. If value is less than 1, then height of element will be used for limiting text
endsWith	string, Node	'\u2026'	Text or Node that truncated text should be ended with. Displays only if text was truncated
endsWithClass	string	'clampify-end'	Class of endsWith text wrapper (uses if endsWith option is a string)
removeEndChars	RegExp	/[.,?!\/\\:\-\s]+$/	Regular expression for remove trailing symbols, must ends with $ for correct trimming
autoUpdate	boolean	false	If set to true element text will be retruncated after window resize
hideOverflowY	boolean	true	If set to true overflow-y: hidden will be automatically added to element's styles
appendToLastElement	boolean	false	If set to true, end element will be appended to last child of element (if possible)
lastElementDeepAppend	boolean	false	If set to true, will lookup for deepest html element in last child element, and append end text in there. Works only with appendToLastElement option

Methods

getId()

Returns id of current instance

Returns: int

resetContent()

Resets initial content of element

Returns: void

truncate()

Truncates element's content if it fill more than space available

Returns: void

destroy()

Resets initial content, disables auto update on window resize and removes link to current instance from element

Returns: void

enableAutoUpdate()

Enables auto truncation on window resizing

Returns: void

disableAutoUpdate()

Disables auto truncation on window resizing

Returns: void

setMaxLines(maxLines)

Sets max lines option to the current instance

Returns: void

Argument	Type	Default	Description
maxLines	int	0	Number of lines

getMaxLines()

Gets max lines option of current instance

Returns int

jQuery Usage

You can call methods via jQuery just passing method name instead of options object to .clampify() method. For example:

$('#demo').clampify('resetContent');

or

$('#demo').clampify('setMaxLines', 3);

NOTE: Using of methods that returns non-void values via jQuery is useless, because jQuery instance will be returned anyways. For getting data you can use clampify property of DOM element.

For example:

var maxLines = $('#demo').get(0).clampify.getMaxLines();

Auto Updating

When auto updating is enabled, text will be automatically truncated after window resize. It's useful when you're using responsive layout and elements sizes are not fixed. How to enable or disable auto updating, you can see in Options section or Methods section.

Auto updating is triggered after window was resized and no more resizing. You can set delay of auto updating with static setWindowResizeDelay(delay) method where delay is integer value in milliseconds. Default value is 100

For setting delay in 0.5s you should call it like this

Clampify.setWindowResizeDelay(500);

LICENCE

Clampify.js is licenced under the MIT licence.