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/**
* @class jQuery.plugin.autoEllipsis
*/
( function ( $ ) {
var
// Cache ellipsed substrings for every string-width-position combination
cache = {},
// Use a separate cache when match highlighting is enabled
matchTextCache = {};
/**
* Automatically truncate the plain text contents of an element and add an ellipsis
*
* @param {Object} options
* @param {'center'|'left'|'right'} [options.position='center'] Where to remove text.
* @param {boolean} [options.tooltip=false] Whether to show a tooltip with the remainder
* of the text.
* @param {boolean} [options.restoreText=false] Whether to save the text for restoring
* later.
* @param {boolean} [options.hasSpan=false] Whether the element is already a container,
* or if the library should create a new container for it.
* @param {string|null} [options.matchText=null] Text to highlight, e.g. search terms.
* @return {jQuery}
* @chainable
*/
$.fn.autoEllipsis = function ( options ) {
options = $.extend( {
position: 'center',
tooltip: false,
restoreText: false,
hasSpan: false,
matchText: null
}, options );
return this.each( function () {
var $trimmableText,
text, trimmableText, w, pw,
l, r, i, side, m,
// container element - used for measuring against
$container = $( this );
if ( options.restoreText ) {
if ( !$container.data( 'autoEllipsis.originalText' ) ) {
$container.data( 'autoEllipsis.originalText', $container.text() );
} else {
$container.text( $container.data( 'autoEllipsis.originalText' ) );
}
}
// trimmable text element - only the text within this element will be trimmed
if ( options.hasSpan ) {
$trimmableText = $container.children( options.selector );
} else {
$trimmableText = $( '<span>' )
.css( 'whiteSpace', 'nowrap' )
.text( $container.text() );
$container
.empty()
.append( $trimmableText );
}
text = $container.text();
trimmableText = $trimmableText.text();
w = $container.width();
pw = 0;
// Try cache
if ( options.matchText ) {
if ( !( text in matchTextCache ) ) {
matchTextCache[text] = {};
}
if ( !( options.matchText in matchTextCache[text] ) ) {
matchTextCache[text][options.matchText] = {};
}
if ( !( w in matchTextCache[text][options.matchText] ) ) {
matchTextCache[text][options.matchText][w] = {};
}
if ( options.position in matchTextCache[text][options.matchText][w] ) {
$container.html( matchTextCache[text][options.matchText][w][options.position] );
if ( options.tooltip ) {
$container.attr( 'title', text );
}
return;
}
} else {
if ( !( text in cache ) ) {
cache[text] = {};
}
if ( !( w in cache[text] ) ) {
cache[text][w] = {};
}
if ( options.position in cache[text][w] ) {
$container.html( cache[text][w][options.position] );
if ( options.tooltip ) {
$container.attr( 'title', text );
}
return;
}
}
if ( $trimmableText.width() + pw > w ) {
switch ( options.position ) {
case 'right':
// Use binary search-like technique for efficiency
l = 0;
r = trimmableText.length;
do {
m = Math.ceil( ( l + r ) / 2 );
$trimmableText.text( trimmableText.slice( 0, m ) + '...' );
if ( $trimmableText.width() + pw > w ) {
// Text is too long
r = m - 1;
} else {
l = m;
}
} while ( l < r );
$trimmableText.text( trimmableText.slice( 0, l ) + '...' );
break;
case 'center':
// TODO: Use binary search like for 'right'
i = [Math.round( trimmableText.length / 2 ), Math.round( trimmableText.length / 2 )];
// Begin with making the end shorter
side = 1;
while ( $trimmableText.outerWidth() + pw > w && i[0] > 0 ) {
$trimmableText.text( trimmableText.slice( 0, i[0] ) + '...' + trimmableText.slice( i[1] ) );
// Alternate between trimming the end and begining
if ( side === 0 ) {
// Make the begining shorter
i[0]--;
side = 1;
} else {
// Make the end shorter
i[1]++;
side = 0;
}
}
break;
case 'left':
// TODO: Use binary search like for 'right'
r = 0;
while ( $trimmableText.outerWidth() + pw > w && r < trimmableText.length ) {
$trimmableText.text( '...' + trimmableText.slice( r ) );
r++;
}
break;
}
}
if ( options.tooltip ) {
$container.attr( 'title', text );
}
if ( options.matchText ) {
$container.highlightText( options.matchText );
matchTextCache[text][options.matchText][w][options.position] = $container.html();
} else {
cache[text][w][options.position] = $container.html();
}
} );
};
/**
* @class jQuery
* @mixins jQuery.plugin.autoEllipsis
*/
}( jQuery ) );
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