複数行をellipsisする君

ellipsis.js

(function(global) {
    'use strict';
 
    function Ellipsis(element, trail) {
        this.element     = element;
        this.exactHeight = element.offsetHeight;
        this.text        = element.textContent;
        this.textSize    = this.text.length;
        this.trail       = trail || '...';
    }
 
    Ellipsis.prototype.run = function() {
 
        while ( this.isOverflow() ) {
            this.addEllipsis();
        }
 
        this.element.style.height = this.exactHeight + 'px';
 
        this.text = null;
    };
 
    Ellipsis.prototype.isOverflow = function() {
        var originalHeight;
 
        this.element.style.height = 'auto';
        originalHeight = this.element.offsetHeight;
 
        return originalHeight > this.exactHeight;
    };
 
    Ellipsis.prototype.addEllipsis = function() {
        this.text = this.text.slice(0, this.textSize- this.trail.length);
        this.element.textContent = this.text + this.trail;
        this.textSize--;
    };
 
    global.Ellipsis = Ellipsis;
 
})(this);