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!function(t,e){"function"==typeof define&&define.amd?define(["tether"],e):"object"==typeof exports?module.exports=e(require("tether")):t.Shepherd=e(t.Tether)}(this,function(t){"use strict";function e(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}function n(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function, not "+typeof e);t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,enumerable:!1,writable:!0,configurable:!0}}),e&&(Object.setPrototypeOf?Object.setPrototypeOf(t,e):t.__proto__=e)}function i(t){return"undefined"==typeof t}function r(t){return t&&t.constructor===Array}function o(t){return t&&t.constructor===Object}function s(t){return"object"==typeof t}function h(t){var e=document.createElement("div");return e.innerHTML=t,e.children[0]}function c(t,e){var n=void 0;return i(t.matches)?i(t.matchesSelector)?i(t.msMatchesSelector)?i(t.webkitMatchesSelector)?i(t.mozMatchesSelector)?i(t.oMatchesSelector)||(n=t.oMatchesSelector):n=t.mozMatchesSelector:n=t.webkitMatchesSelector:n=t.msMatchesSelector:n=t.matchesSelector:n=t.matches,n.call(t,e)}function l(t){if(s(t))return t.hasOwnProperty("element")&&t.hasOwnProperty("on")?t:null;var e=S.exec(t);if(!e)return null;var n=e[2];return"["===n[0]&&(n=n.substring(1,n.length-1)),{element:e[1],on:n}}function a(t,e){if(null===t||i(t))return t;if(s(t))return t;for(var n=t.split(" "),r={},o=e.length-1,h=n.length-1;h>=0;h--){if(0===o){r[e[o]]=n.slice(0,h+1).join(" ");break}r[e[o]]=n[h],o--}return r}var u=function(){function t(t,e){for(var n=0;n<e.length;n++){var i=e[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(t,i.key,i)}}return function(e,n,i){return n&&t(e.prototype,n),i&&t(e,i),e}}(),d=function(t,e,n){for(var i=!0;i;){var r=t,o=e,s=n;i=!1,null===r&&(r=Function.prototype);var h=Object.getOwnPropertyDescriptor(r,o);if(void 0!==h){if("value"in h)return h.value;var c=h.get;if(void 0===c)return;return c.call(s)}var l=Object.getPrototypeOf(r);if(null===l)return;t=l,e=o,n=s,i=!0,h=l=void 0}},p=t.Utils,f=p.Evented,v=p.addClass,m=p.extend,y=p.hasClass,g=p.removeClass,b=p.uniqueId,w=new f,k={"top right":"bottom left","top left":"bottom right","top center":"bottom center","middle right":"middle left","middle left":"middle right","middle center":"middle center","bottom left":"top right","bottom right":"top left","bottom center":"top center",top:"bottom center",left:"middle right",right:"middle left",bottom:"top center",center:"middle center",middle:"middle center"},S=/^(.+) (top|left|right|bottom|center|\[[a-z ]+\])$/,O=function(s){function p(t,n){return e(this,p),d(Object.getPrototypeOf(p.prototype),"constructor",this).call(this,t,n),this.tour=t,this.bindMethods(),this.setOptions(n),this}return n(p,s),u(p,[{key:"bindMethods",value:function(){var t=this,e=["_show","show","hide","isOpen","cancel","complete","scrollTo","destroy","render"];e.map(function(e){t[e]=t[e].bind(t)})}},{key:"setOptions",value:function(){var t=arguments.length<=0||void 0===arguments[0]?{}:arguments[0];this.options=t,this.destroy(),this.id=this.options.id||this.id||"step-"+b();var e=this.options.when;if(e)for(var n in e)if({}.hasOwnProperty.call(e,n)){var s=e[n];this.on(n,s,this)}var h=JSON.stringify(this.options.buttons),c=i(h)||"true"===h,l="{}"===h||"[]"===h||"null"===h||"false"===h,a=!c&&r(this.options.buttons),u=!c&&o(this.options.buttons);c?this.options.buttons=[{text:"Next",action:this.tour.next,classes:"btn"}]:!l&&u?this.options.buttons=[this.options.buttons]:!l&&a||(this.options.buttons=!1)}},{key:"getTour",value:function(){return this.tour}},{key:"bindAdvance",value:function(){var t=this,e=a(this.options.advanceOn,["selector","event"]),n=e.event,r=e.selector,o=function(e){t.isOpen()&&(i(r)?t.el&&e.target===t.el&&t.tour.next():c(e.target,r)&&t.tour.next())};document.body.addEventListener(n,o),this.on("destroy",function(){return document.body.removeEventListener(n,o)})}},{key:"getAttachTo",value:function(){var t=l(this.options.attachTo)||{},e=m({},t);return"string"==typeof t.element&&(e.element=document.querySelector(t.element),e.element||console.error("The element for this Shepherd step was not found "+t.element)),e}},{key:"setupTether",value:function(){if(i(t))throw new Error("Using the attachment feature of Shepherd requires the Tether library");var e=this.getAttachTo(),n=k[e.on]||k.right;i(e.element)&&(e.element="viewport",n="middle center");var r={classPrefix:"shepherd",element:this.el,constraints:[{to:"window",pin:!0,attachment:"together"}],target:e.element,offset:e.offset||"0 0",attachment:n};this.tether&&this.tether.destroy(),this.tether=new t(m(r,this.options.tetherOptions))}},{key:"show",value:function(){var t=this;if(!i(this.options.beforeShowPromise)){var e=this.options.beforeShowPromise();if(!i(e))return e.then(function(){return t._show()})}this._show()}},{key:"_show",value:function(){var t=this;this.trigger("before-show"),this.el||this.render(),v(this.el,"shepherd-open"),document.body.setAttribute("data-shepherd-step",this.id),this.setupTether(),this.options.scrollTo&&setTimeout(function(){t.scrollTo()}),this.trigger("show")}},{key:"hide",value:function(){this.trigger("before-hide"),g(this.el,"shepherd-open"),document.body.removeAttribute("data-shepherd-step"),this.tether&&this.tether.destroy(),this.tether=null,this.trigger("hide")}},{key:"isOpen",value:function(){return this.el&&y(this.el,"shepherd-open")}},{key:"cancel",value:function(){this.tour.cancel(),this.trigger("cancel")}},{key:"complete",value:function(){this.tour.complete(),this.trigger("complete")}},{key:"scrollTo",value:function(){var t=this.getAttachTo(),e=t.element;i(this.options.scrollToHandler)?i(e)||e.scrollIntoView():this.options.scrollToHandler(e)}},{key:"destroy",value:function(){!i(this.el)&&this.el.parentNode&&(this.el.parentNode.removeChild(this.el),delete this.el),this.tether&&this.tether.destroy(),this.tether=null,this.trigger("destroy")}},{key:"render",value:function(){var t=this;i(this.el)||this.destroy(),this.el=h("<div class='shepherd-step "+(this.options.classes||"")+"' data-id='"+this.id+"' "+(this.options.idAttribute?'id="'+this.options.idAttribute+'"':"")+"></div>");var e=document.createElement("div");e.className="shepherd-content",this.el.appendChild(e);var n=document.createElement("header");if(e.appendChild(n),this.options.title&&(n.innerHTML+="<h3 class='shepherd-title'>"+this.options.title+"</h3>",this.el.className+=" shepherd-has-title"),this.options.showCancelLink){var r=h("<a href class='shepherd-cancel-link'>✕</a>");n.appendChild(r),this.el.className+=" shepherd-has-cancel-link",this.bindCancelLink(r)}i(this.options.text)||!function(){var n=h("<div class='shepherd-text'></div>"),i=t.options.text;"function"==typeof i&&(i=i.call(t,n)),i instanceof HTMLElement?n.appendChild(i):("string"==typeof i&&(i=[i]),i.map(function(t){n.innerHTML+="<p>"+t+"</p>"})),e.appendChild(n)}(),this.options.buttons&&!function(){var n=document.createElement("footer"),i=h("<ul class='shepherd-buttons'></ul>");t.options.buttons.map(function(e){var n=h("<li><a class='shepherd-button "+(e.classes||"")+"'>"+e.text+"</a>");i.appendChild(n),t.bindButtonEvents(e,n.querySelector("a"))}),n.appendChild(i),e.appendChild(n)}(),document.body.appendChild(this.el),this.setupTether(),this.options.advanceOn&&this.bindAdvance()}},{key:"bindCancelLink",value:function(t){var e=this;t.addEventListener("click",function(t){t.preventDefault(),e.cancel()})}},{key:"bindButtonEvents",value:function(t,e){var n=this;t.events=t.events||{},i(t.action)||(t.events.click=t.action);for(var r in t.events)if({}.hasOwnProperty.call(t.events,r)){var o=t.events[r];"string"==typeof o&&!function(){var t=o;o=function(){return n.tour.show(t)}}(),e.addEventListener(r,o)}this.on("destroy",function(){for(var n in t.events)if({}.hasOwnProperty.call(t.events,n)){var i=t.events[n];e.removeEventListener(n,i)}})}}]),p}(f),T=function(t){function r(){var t=this,n=arguments.length<=0||void 0===arguments[0]?{}:arguments[0];e(this,r),d(Object.getPrototypeOf(r.prototype),"constructor",this).call(this,n),this.bindMethods(),this.options=n,this.steps=this.options.steps||[];var i=["complete","cancel","hide","start","show","active","inactive"];return i.map(function(e){!function(e){t.on(e,function(n){n=n||{},n.tour=t,w.trigger(e,n)})}(e)}),this}return n(r,t),u(r,[{key:"bindMethods",value:function(){var t=this,e=["next","back","cancel","complete","hide"];e.map(function(e){t[e]=t[e].bind(t)})}},{key:"addStep",value:function(t,e){return i(e)&&(e=t),e instanceof O?e.tour=this:("string"!=typeof t&&"number"!=typeof t||(e.id=t.toString()),e=m({},this.options.defaults,e),e=new O(this,e)),this.steps.push(e),this}},{key:"removeStep",value:function(t){for(var e=this.getCurrentStep(),n=0;n<this.steps.length;++n){var i=this.steps[n];if(i.id===t){i.isOpen()&&i.hide(),i.destroy(),this.steps.splice(n,1);break}}e&&e.id===t&&(this.currentStep=void 0,this.steps.length?this.show(0):this.hide())}},{key:"getById",value:function(t){for(var e=0;e<this.steps.length;++e){var n=this.steps[e];if(n.id===t)return n}}},{key:"getCurrentStep",value:function(){return this.currentStep}},{key:"next",value:function(){var t=this.steps.indexOf(this.currentStep);t===this.steps.length-1?(this.hide(t),this.trigger("complete"),this.done()):this.show(t+1,!0)}},{key:"back",value:function(){var t=this.steps.indexOf(this.currentStep);this.show(t-1,!1)}},{key:"cancel",value:function(){this.currentStep&&this.currentStep.hide(),this.trigger("cancel"),this.done()}},{key:"complete",value:function(){this.currentStep&&this.currentStep.hide(),this.trigger("complete"),this.done()}},{key:"hide",value:function(){this.currentStep&&this.currentStep.hide(),this.trigger("hide"),this.done()}},{key:"done",value:function(){w.activeTour=null,g(document.body,"shepherd-active"),this.trigger("inactive",{tour:this})}},{key:"show",value:function(){var t=arguments.length<=0||void 0===arguments[0]?0:arguments[0],e=arguments.length<=1||void 0===arguments[1]||arguments[1];this.currentStep?this.currentStep.hide():(v(document.body,"shepherd-active"),this.trigger("active",{tour:this})),w.activeTour=this;var n=void 0;if(n="string"==typeof t?this.getById(t):this.steps[t])if(i(n.options.showOn)||n.options.showOn())this.trigger("show",{step:n,previous:this.currentStep}),this.currentStep&&this.currentStep.hide(),this.currentStep=n,n.show();else{var r=this.steps.indexOf(n),o=e?r+1:r-1;this.show(o,e)}}},{key:"start",value:function(){this.trigger("start"),this.currentStep=null,this.next()}}]),r}(f);return m(w,{Tour:T,Step:O,Evented:f}),w});