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    <p>Hi do you have the appropriate js included?</p> <p>Assuming you are trying to use twitter bootstrap's alert functionality? </p> <pre><code>!function ($) { "use strict"; // jshint ;_; /* ALERT CLASS DEFINITION * ====================== */ var dismiss = '[data-dismiss="alert"]' , Alert = function (el) { $(el).on('click', dismiss, this.close) } Alert.prototype.close = function (e) { var $this = $(this) , selector = $this.attr('data-target') , $parent if (!selector) { selector = $this.attr('href') selector = selector &amp;&amp; selector.replace(/.*(?=#[^\s]*$)/, '') //strip for ie7 } $parent = $(selector) e &amp;&amp; e.preventDefault() $parent.length || ($parent = $this.hasClass('alert') ? $this : $this.parent()) $parent.trigger(e = $.Event('close')) if (e.isDefaultPrevented()) return $parent.removeClass('in') function removeElement() { $parent .trigger('closed') .remove() } $.support.transition &amp;&amp; $parent.hasClass('fade') ? $parent.on($.support.transition.end, removeElement) : removeElement() } /* ALERT PLUGIN DEFINITION * ======================= */ var old = $.fn.alert $.fn.alert = function (option) { return this.each(function () { var $this = $(this) , data = $this.data('alert') if (!data) $this.data('alert', (data = new Alert(this))) if (typeof option == 'string') data[option].call($this) }) } $.fn.alert.Constructor = Alert /* ALERT NO CONFLICT * ================= */ $.fn.alert.noConflict = function () { $.fn.alert = old return this } /* ALERT DATA-API * ============== */ $(document).on('click.alert.data-api', dismiss, Alert.prototype.close) }(window.jQuery); </code></pre> <p>How are you using twitter bootstrap in your application?</p> <p>Have you included <code>//= require bootstrap</code> in your application.js file? This is required with my preference of using gem bootstrap-sass (relies on gem sass-rails)</p>
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