js-lib/trunk8.js

常用js插件供项目调用

/**!
 * trunk8 v1.3.2
 * https://github.com/rviscomi/trunk8
 * 
 * Copyright 2012 Rick Viscomi
 * Released under the MIT License.
 * 
 * Date: October 21, 2012
 */

(function($){var methods,utils,SIDES={center:'center',left:'left',right:'right'},WIDTH={auto:'auto'};function trunk8(element){this.$element=$(element);this.original_text=this.$element.html();this.settings=$.extend({},$.fn.trunk8.defaults);}trunk8.prototype.updateSettings=function(options){this.settings=$.extend(this.settings,options);};function truncate(){var data=this.data('trunk8'),settings=data.settings,width=settings.width,side=settings.side,fill=settings.fill,line_height=utils.getLineHeight(this)*settings.lines,str=data.original_text,length=str.length,max_bite='',lower,upper,bite_size,bite;this.html(str);if(width===WIDTH.auto){if(this.height()<=line_height){return;}lower=0;upper=length-1;while(lower<=upper){bite_size=lower+((upper-lower)>>1);bite=utils.eatStr(str,side,length-bite_size,fill);this.html(bite);if(this.height()>line_height){upper=bite_size-1;}else{lower=bite_size+1;max_bite=(max_bite.length>bite.length)?max_bite:bite;}}this.html('');this.html(max_bite);if(settings.tooltip){this.attr('title',str);}}else if(!isNaN(width)){bite_size=length-width;bite=utils.eatStr(str,side,bite_size,fill);this.html(bite);if(settings.tooltip){this.attr('title',str);}}else{$.error('Invalid width "'+width+'".');}}methods={init:function(options){return this.each(function(){var $this=$(this),data=$this.data('trunk8');if(!data){$this.data('trunk8',(data=new trunk8(this)));}data.updateSettings(options);truncate.call($this);});},update:function(new_string){return this.each(function(){var $this=$(this);if(new_string){$this.data('trunk8').original_text=new_string;}truncate.call($this);});},revert:function(){return this.each(function(){var text=$(this).data('trunk8').original_text;$(this).html(text);});},getSettings:function(){return this.get(0).data('trunk8').settings;}};utils={eatStr:function(str,side,bite_size,fill){var length=str.length,key=utils.eatStr.generateKey.apply(null,arguments),half_length,half_bite_size;if(utils.eatStr.cache[key]){return utils.eatStr.cache[key];}if((typeof str!=='string')||(length===0)){$.error('Invalid source string "'+str+'".');}if((bite_size<0)||(bite_size>length)){$.error('Invalid bite size "'+bite_size+'".');}else if(bite_size===0){return str;}if(typeof(fill+'')!=='string'){$.error('Fill unable to be converted to a string.');}switch(side){case SIDES.right:return utils.eatStr.cache[key]=$.trim(str.substr(0,length-bite_size))+fill;case SIDES.left:return utils.eatStr.cache[key]=fill+$.trim(str.substr(bite_size));case SIDES.center:half_length=length>>1;half_bite_size=bite_size>>1;return utils.eatStr.cache[key]=$.trim(utils.eatStr(str.substr(0,length-half_length),SIDES.right,bite_size-half_bite_size,''))+fill+$.trim(utils.eatStr(str.substr(length-half_length),SIDES.left,half_bite_size,''));default:$.error('Invalid side "'+side+'".');}},getLineHeight:function(elem){var $elem=$(elem),float=$elem.css('float'),position=$elem.css('position'),html=$elem.html(),wrapper_id='line-height-test',line_height;if(float!=='none'){$elem.css('float','none');}if(position==='absolute'){$elem.css('position','static');}$elem.html('i').wrap('<div id="'+wrapper_id+'" />');line_height=$('#'+wrapper_id).innerHeight();$elem.html(html).css({'float':float,'position':position}).unwrap();return line_height;}};utils.eatStr.cache={};utils.eatStr.generateKey=function(){return Array.prototype.join.call(arguments,'');};$.fn.trunk8=function(method){if(methods[method]){return methods[method].apply(this,Array.prototype.slice.call(arguments,1));}else if(typeof method==='object'||!method){return methods.init.apply(this,arguments);}else{$.error('Method '+method+' does not exist on jQuery.trunk8');}};$.fn.trunk8.defaults={fill:'&hellip;',lines:1,side:SIDES.right,tooltip:true,width:WIDTH.auto};})(jQuery);