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02/10/2017

Como fazer meu site ou web app funcionar off-line ?

Nenhum comentário :

Para que vários recursos para apps web funcionem, inclusive a possibilidade de adicionar à tela inicial é necessário que a página funcione offline ou pelo menos seja configurada para isso, caso você não saiba fazer isso não se preocupe você vai aprender agora.

Requisitos

Seu servidor deve :

  • Ter uma conexão HTTPS valida, ou seja, sem certificados auto-assinados e tudo dentro dos conformes.
  • Poder hospedar um arquivo Java Script no mesmo domínio de preferência na pasta raiz (/).

Seu usuário deve :

  • Ter permitido os Java Script em seu navegador.
  • Estar usando um navegador que suporte Service Workers.

Para testar em seu computador você vai precisar de:

  • Servidor Web de sua preferência, preferencialmente o Web Server for Chrome.
  • Navegador que suporte Service Workers, preferencialmente Google Chrome.
  • Editor de Texto de sua preferência, pode ser até o Bloco de notas.
Para o desenvolvimento local o Google Chrome não requere o HTTPS, mas na web o HTTPS é obrigatório em todos os navegadores para garantir a segurança do cache.



Configure em um Java Script que será chamado por todas as páginas que neste artigo vai ser chamado de main.js o seguinte código:


/**
 * material-design-lite - Material Design Components in CSS, JS and HTML
 * @version v1.2.1
 * @license Apache-2.0
 * @copyright 2015 Google, Inc.
 * @link https://github.com/google/material-design-lite
 */

!function(){"use strict";function e(e,t){if(e){if(t.element_.classList.contains(t.CssClasses_.MDL_JS_RIPPLE_EFFECT)){var s=document.createElement("span");s.classList.add(t.CssClasses_.MDL_RIPPLE_CONTAINER),s.classList.add(t.CssClasses_.MDL_JS_RIPPLE_EFFECT);var i=document.createElement("span");i.classList.add(t.CssClasses_.MDL_RIPPLE),s.appendChild(i),e.appendChild(s)}e.addEventListener("click",function(s){s.preventDefault();var i=e.href.split("#")[1],n=t.element_.querySelector("#"+i);t.resetTabState_(),t.resetPanelState_(),e.classList.add(t.CssClasses_.ACTIVE_CLASS),n.classList.add(t.CssClasses_.ACTIVE_CLASS)})}}function t(e,t,s,i){function n(){var n=e.href.split("#")[1],a=i.content_.querySelector("#"+n);i.resetTabState_(t),i.resetPanelState_(s),e.classList.add(i.CssClasses_.IS_ACTIVE),a.classList.add(i.CssClasses_.IS_ACTIVE)}if(i.tabBar_.classList.contains(i.CssClasses_.JS_RIPPLE_EFFECT)){var a=document.createElement("span");a.classList.add(i.CssClasses_.RIPPLE_CONTAINER),a.classList.add(i.CssClasses_.JS_RIPPLE_EFFECT);var l=document.createElement("span");l.classList.add(i.CssClasses_.RIPPLE),a.appendChild(l),e.appendChild(a)}e.addEventListener("click",function(t){"#"===e.getAttribute("href").charAt(0)&&(t.preventDefault(),n())}),e.show=n}var s={upgradeDom:function(e,t){},upgradeElement:function(e,t){},upgradeElements:function(e){},upgradeAllRegistered:function(){},registerUpgradedCallback:function(e,t){},register:function(e){},downgradeElements:function(e){}};s=function(){function e(e,t){for(var s=0;s0&&a(t.children))}function l(t){var s="undefined"==typeof t.widget&&"undefined"==typeof t.widget,i=!0;s||(i=t.widget||t.widget);var n={classConstructor:t.constructor||t.constructor,className:t.classAsString||t.classAsString,cssClass:t.cssClass||t.cssClass,widget:i,callbacks:[]};if(h.forEach(function(e){if(e.cssClass===n.cssClass)throw new Error("The provided cssClass has already been registered: "+e.cssClass);if(e.className===n.className)throw new Error("The provided className has already been registered")}),t.constructor.prototype.hasOwnProperty(p))throw new Error("MDL component classes must not have "+p+" defined as a property.");var a=e(t.classAsString,n);a||h.push(n)}function o(t,s){var i=e(t);i&&i.callbacks.push(s)}function r(){for(var e=0;e0&&this.container_.classList.contains(this.CssClasses_.IS_VISIBLE)&&(e.keyCode===this.Keycodes_.UP_ARROW?(e.preventDefault(),t[t.length-1].focus()):e.keyCode===this.Keycodes_.DOWN_ARROW&&(e.preventDefault(),t[0].focus()))}},d.prototype.handleItemKeyboardEvent_=function(e){if(this.element_&&this.container_){var t=this.element_.querySelectorAll("."+this.CssClasses_.ITEM+":not([disabled])");if(t&&t.length>0&&this.container_.classList.contains(this.CssClasses_.IS_VISIBLE)){var s=Array.prototype.slice.call(t).indexOf(e.target);if(e.keyCode===this.Keycodes_.UP_ARROW)e.preventDefault(),s>0?t[s-1].focus():t[t.length-1].focus();else if(e.keyCode===this.Keycodes_.DOWN_ARROW)e.preventDefault(),t.length>s+1?t[s+1].focus():t[0].focus();else if(e.keyCode===this.Keycodes_.SPACE||e.keyCode===this.Keycodes_.ENTER){e.preventDefault();var i=new MouseEvent("mousedown");e.target.dispatchEvent(i),i=new MouseEvent("mouseup"),e.target.dispatchEvent(i),e.target.click()}else e.keyCode===this.Keycodes_.ESCAPE&&(e.preventDefault(),this.hide())}}},d.prototype.handleItemClick_=function(e){e.target.hasAttribute("disabled")?e.stopPropagation():(this.closing_=!0,window.setTimeout(function(e){this.hide(),this.closing_=!1}.bind(this),this.Constant_.CLOSE_TIMEOUT))},d.prototype.applyClip_=function(e,t){this.element_.classList.contains(this.CssClasses_.UNALIGNED)?this.element_.style.clip="":this.element_.classList.contains(this.CssClasses_.BOTTOM_RIGHT)?this.element_.style.clip="rect(0 "+t+"px 0 "+t+"px)":this.element_.classList.contains(this.CssClasses_.TOP_LEFT)?this.element_.style.clip="rect("+e+"px 0 "+e+"px 0)":this.element_.classList.contains(this.CssClasses_.TOP_RIGHT)?this.element_.style.clip="rect("+e+"px "+t+"px "+e+"px "+t+"px)":this.element_.style.clip=""},d.prototype.removeAnimationEndListener_=function(e){e.target.classList.remove(d.prototype.CssClasses_.IS_ANIMATING)},d.prototype.addAnimationEndListener_=function(){this.element_.addEventListener("transitionend",this.removeAnimationEndListener_),this.element_.addEventListener("webkitTransitionEnd",this.removeAnimationEndListener_)},d.prototype.show=function(e){if(this.element_&&this.container_&&this.outline_){var t=this.element_.getBoundingClientRect().height,s=this.element_.getBoundingClientRect().width;this.container_.style.width=s+"px",this.container_.style.height=t+"px",this.outline_.style.width=s+"px",this.outline_.style.height=t+"px";for(var i=this.Constant_.TRANSITION_DURATION_SECONDS*this.Constant_.TRANSITION_DURATION_FRACTION,n=this.element_.querySelectorAll("."+this.CssClasses_.ITEM),a=0;a0&&this.showSnackbar(this.queuedNotifications_.shift())},C.prototype.cleanup_=function(){this.element_.classList.remove(this.cssClasses_.ACTIVE),setTimeout(function(){this.element_.setAttribute("aria-hidden","true"),this.textElement_.textContent="",Boolean(this.actionElement_.getAttribute("aria-hidden"))||(this.setActionHidden_(!0),this.actionElement_.textContent="",this.actionElement_.removeEventListener("click",this.actionHandler_)),this.actionHandler_=void 0,this.message_=void 0,this.actionText_=void 0,this.active=!1,this.checkQueue_()}.bind(this),this.Constant_.ANIMATION_LENGTH)},C.prototype.setActionHidden_=function(e){e?this.actionElement_.setAttribute("aria-hidden","true"):this.actionElement_.removeAttribute("aria-hidden")},s.register({constructor:C,classAsString:"MaterialSnackbar",cssClass:"mdl-js-snackbar",widget:!0});var u=function(e){this.element_=e,this.init()};window.MaterialSpinner=u,u.prototype.Constant_={MDL_SPINNER_LAYER_COUNT:4},u.prototype.CssClasses_={MDL_SPINNER_LAYER:"mdl-spinner__layer",MDL_SPINNER_CIRCLE_CLIPPER:"mdl-spinner__circle-clipper",MDL_SPINNER_CIRCLE:"mdl-spinner__circle",MDL_SPINNER_GAP_PATCH:"mdl-spinner__gap-patch",MDL_SPINNER_LEFT:"mdl-spinner__left",MDL_SPINNER_RIGHT:"mdl-spinner__right"},u.prototype.createLayer=function(e){var t=document.createElement("div");t.classList.add(this.CssClasses_.MDL_SPINNER_LAYER),t.classList.add(this.CssClasses_.MDL_SPINNER_LAYER+"-"+e);var s=document.createElement("div");s.classList.add(this.CssClasses_.MDL_SPINNER_CIRCLE_CLIPPER),s.classList.add(this.CssClasses_.MDL_SPINNER_LEFT);var i=document.createElement("div");i.classList.add(this.CssClasses_.MDL_SPINNER_GAP_PATCH);var n=document.createElement("div");n.classList.add(this.CssClasses_.MDL_SPINNER_CIRCLE_CLIPPER),n.classList.add(this.CssClasses_.MDL_SPINNER_RIGHT);for(var a=[s,i,n],l=0;l=this.maxRows&&e.preventDefault()},L.prototype.onFocus_=function(e){this.element_.classList.add(this.CssClasses_.IS_FOCUSED)},L.prototype.onBlur_=function(e){this.element_.classList.remove(this.CssClasses_.IS_FOCUSED)},L.prototype.onReset_=function(e){this.updateClasses_()},L.prototype.updateClasses_=function(){this.checkDisabled(),this.checkValidity(),this.checkDirty(),this.checkFocus()},L.prototype.checkDisabled=function(){this.input_.disabled?this.element_.classList.add(this.CssClasses_.IS_DISABLED):this.element_.classList.remove(this.CssClasses_.IS_DISABLED)},L.prototype.checkDisabled=L.prototype.checkDisabled,L.prototype.checkFocus=function(){Boolean(this.element_.querySelector(":focus"))?this.element_.classList.add(this.CssClasses_.IS_FOCUSED):this.element_.classList.remove(this.CssClasses_.IS_FOCUSED)},L.prototype.checkFocus=L.prototype.checkFocus,L.prototype.checkValidity=function(){this.input_.validity&&(this.input_.validity.valid?this.element_.classList.remove(this.CssClasses_.IS_INVALID):this.element_.classList.add(this.CssClasses_.IS_INVALID))},L.prototype.checkValidity=L.prototype.checkValidity,L.prototype.checkDirty=function(){this.input_.value&&this.input_.value.length>0?this.element_.classList.add(this.CssClasses_.IS_DIRTY):this.element_.classList.remove(this.CssClasses_.IS_DIRTY)},L.prototype.checkDirty=L.prototype.checkDirty,L.prototype.disable=function(){this.input_.disabled=!0,this.updateClasses_()},L.prototype.disable=L.prototype.disable,L.prototype.enable=function(){this.input_.disabled=!1,this.updateClasses_()},L.prototype.enable=L.prototype.enable,L.prototype.change=function(e){this.input_.value=e||"",this.updateClasses_()},L.prototype.change=L.prototype.change,L.prototype.init=function(){if(this.element_&&(this.label_=this.element_.querySelector("."+this.CssClasses_.LABEL),this.input_=this.element_.querySelector("."+this.CssClasses_.INPUT),this.input_)){this.input_.hasAttribute(this.Constant_.MAX_ROWS_ATTRIBUTE)&&(this.maxRows=parseInt(this.input_.getAttribute(this.Constant_.MAX_ROWS_ATTRIBUTE),10),isNaN(this.maxRows)&&(this.maxRows=this.Constant_.NO_MAX_ROWS)),this.input_.hasAttribute("placeholder")&&this.element_.classList.add(this.CssClasses_.HAS_PLACEHOLDER),this.boundUpdateClassesHandler=this.updateClasses_.bind(this),this.boundFocusHandler=this.onFocus_.bind(this),this.boundBlurHandler=this.onBlur_.bind(this),this.boundResetHandler=this.onReset_.bind(this),this.input_.addEventListener("input",this.boundUpdateClassesHandler),this.input_.addEventListener("focus",this.boundFocusHandler),this.input_.addEventListener("blur",this.boundBlurHandler),this.input_.addEventListener("reset",this.boundResetHandler),this.maxRows!==this.Constant_.NO_MAX_ROWS&&(this.boundKeyDownHandler=this.onKeyDown_.bind(this),this.input_.addEventListener("keydown",this.boundKeyDownHandler));var e=this.element_.classList.contains(this.CssClasses_.IS_INVALID);this.updateClasses_(),this.element_.classList.add(this.CssClasses_.IS_UPGRADED),e&&this.element_.classList.add(this.CssClasses_.IS_INVALID),this.input_.hasAttribute("autofocus")&&(this.element_.focus(),this.checkFocus())}},s.register({constructor:L,classAsString:"MaterialTextfield",cssClass:"mdl-js-textfield",widget:!0});var I=function(e){this.element_=e,this.init()};window.MaterialTooltip=I,I.prototype.Constant_={},I.prototype.CssClasses_={IS_ACTIVE:"is-active",BOTTOM:"mdl-tooltip--bottom",LEFT:"mdl-tooltip--left",RIGHT:"mdl-tooltip--right",TOP:"mdl-tooltip--top"},I.prototype.handleMouseEnter_=function(e){var t=e.target.getBoundingClientRect(),s=t.left+t.width/2,i=t.top+t.height/2,n=-1*(this.element_.offsetWidth/2),a=-1*(this.element_.offsetHeight/2);this.element_.classList.contains(this.CssClasses_.LEFT)||this.element_.classList.contains(this.CssClasses_.RIGHT)?(s=t.width/2,i+a<0 1024px="" aterialtooltip="" chevron_left="" chevron_right="" classasstring:="" constructor:i="" cssclass:="" data-mdl-for="" e="!this.element_.classList.contains(this.CssClasses_.IS_SMALL_SCREEN)||this.element_.classList.contains(this.CssClasses_.FIXED_HEADER);this.content_.scrollTop" f.prototype.contentscrollhandler_="function(){if(!this.header_.classList.contains(this.CssClasses_.IS_ANIMATING)){var" f.prototype.keycodes_="{ENTER:13,ESCAPE:27,SPACE:32},f.prototype.Mode_={STANDARD:0,SEAMED:1,WATERFALL:2,SCROLL:3},f.prototype.CssClasses_={CONTAINER:" f="function(e){this.element_=e,this.init()};window.MaterialLayout=f,f.prototype.Constant_={MAX_WIDTH:" for="" has-drawer="" has-scrolling-header="" has-tabs="" is-active="" is-animating="" is-casting-shadow="" is-compact="" is-small-screen="" is-upgraded="" is-visible="" material-icons="" max-width:="" mdl-js-ripple-effect--ignore-events="" mdl-js-ripple-effect="" mdl-layout--fixed-header="" mdl-layout--large-screen-only="" mdl-layout--small-screen-only="" mdl-layout__container="" mdl-layout__content="" mdl-layout__drawer-button="" mdl-layout__drawer="" mdl-layout__header--scroll="" mdl-layout__header--seamed="" mdl-layout__header--waterfall="" mdl-layout__header="" mdl-layout__obfuscator="" mdl-layout__tab-bar-button="" mdl-layout__tab-bar-container="" mdl-layout__tab-bar-left-button="" mdl-layout__tab-bar-right-button="" mdl-layout__tab-bar="" mdl-layout__tab-panel="" mdl-layout__tab-ripple-container="" mdl-layout__tab="" mdl-ripple="" mdl-tooltip="" mouseenter="" mouseleave="" n="" prototype.hidetooltip_="function(){this.element_.classList.remove(this.CssClasses_.IS_ACTIVE)},I.prototype.init=function(){if(this.element_){var" px="" s.register="" s="" scroll="" tabindex="" this.boundmouseenterhandler="" this.boundmouseleaveandscrollhandler="" this.cssclasses_.is_active="" this.cssclasses_.left="" this.cssclasses_.right="" this.cssclasses_.top="" this.element_.classlist.add="" this.element_.classlist.contains="" this.element_.getattribute="" this.element_.style.left="t.left-this.element_.offsetWidth-10+" this.element_.style.marginleft="n+" this.element_.style.margintop="a+" this.element_.style.top="t.top+t.height+10+" this.forelement_.addeventlistener="" this.forelement_.setattribute="" this.forelement_="document.getElementById(e)),this.forElement_&&(this.forElement_.hasAttribute(" touchend="" touchstart="" var="" window.addeventlistener="" xe5d2="">0&&!this.header_.classList.contains(this.CssClasses_.IS_COMPACT)?(this.header_.classList.add(this.CssClasses_.CASTING_SHADOW),this.header_.classList.add(this.CssClasses_.IS_COMPACT),e&&this.header_.classList.add(this.CssClasses_.IS_ANIMATING)):this.content_.scrollTop<=0&&this.header_.classList.contains(this.CssClasses_.IS_COMPACT)&&(this.header_.classList.remove(this.CssClasses_.CASTING_SHADOW),this.header_.classList.remove(this.CssClasses_.IS_COMPACT),e&&this.header_.classList.add(this.CssClasses_.IS_ANIMATING))}},f.prototype.keyboardEventHandler_=function(e){e.keyCode===this.Keycodes_.ESCAPE&&this.drawer_.classList.contains(this.CssClasses_.IS_DRAWER_OPEN)&&this.toggleDrawer()},f.prototype.screenSizeHandler_=function(){this.screenSizeMediaQuery_.matches?this.element_.classList.add(this.CssClasses_.IS_SMALL_SCREEN):(this.element_.classList.remove(this.CssClasses_.IS_SMALL_SCREEN),this.drawer_&&(this.drawer_.classList.remove(this.CssClasses_.IS_DRAWER_OPEN),this.obfuscator_.classList.remove(this.CssClasses_.IS_DRAWER_OPEN)))},f.prototype.drawerToggleHandler_=function(e){if(e&&"keydown"===e.type){if(e.keyCode!==this.Keycodes_.SPACE&&e.keyCode!==this.Keycodes_.ENTER)return;e.preventDefault()}this.toggleDrawer()},f.prototype.headerTransitionEndHandler_=function(){this.header_.classList.remove(this.CssClasses_.IS_ANIMATING)},f.prototype.headerClickHandler_=function(){this.header_.classList.contains(this.CssClasses_.IS_COMPACT)&&(this.header_.classList.remove(this.CssClasses_.IS_COMPACT),this.header_.classList.add(this.CssClasses_.IS_ANIMATING))},f.prototype.resetTabState_=function(e){for(var t=0;t0?c.classList.add(this.CssClasses_.IS_ACTIVE):c.classList.remove(this.CssClasses_.IS_ACTIVE),this.tabBar_.scrollLeft0)return;this.setFrameCount(1);var i,n,a=e.currentTarget.getBoundingClientRect();if(0===e.clientX&&0===e.clientY)i=Math.round(a.width/2),n=Math.round(a.height/2);else{var l=e.clientX?e.clientX:e.touches[0].clientX,o=e.clientY?e.clientY:e.touches[0].clientY;i=Math.round(l-a.left),n=Math.round(o-a.top)}this.setRippleXY(i,n),this.setRippleStyles(!0),window.requestAnimationFrame(this.animFrameHandler.bind(this))}},y.prototype.upHandler_=function(e){e&&2!==e.detail&&window.setTimeout(function(){this.rippleElement_.classList.remove(this.CssClasses_.IS_VISIBLE)}.bind(this),0)},y.prototype.init=function(){if(this.element_){var e=this.element_.classList.contains(this.CssClasses_.RIPPLE_CENTER);this.element_.classList.contains(this.CssClasses_.RIPPLE_EFFECT_IGNORE_EVENTS)||(this.rippleElement_=this.element_.querySelector("."+this.CssClasses_.RIPPLE),this.frameCount_=0,this.rippleSize_=0,this.x_=0,this.y_=0,this.ignoringMouseDown_=!1,this.boundDownHandler=this.downHandler_.bind(this),this.element_.addEventListener("mousedown",this.boundDownHandler),this.element_.addEventListener("touchstart",this.boundDownHandler),this.boundUpHandler=this.upHandler_.bind(this),this.element_.addEventListener("mouseup",this.boundUpHandler),this.element_.addEventListener("mouseleave",this.boundUpHandler),this.element_.addEventListener("touchend",this.boundUpHandler),this.element_.addEventListener("blur",this.boundUpHandler),this.getFrameCount=function(){return this.frameCount_},this.setFrameCount=function(e){this.frameCount_=e},this.getRippleElement=function(){return this.rippleElement_},this.setRippleXY=function(e,t){this.x_=e,this.y_=t},this.setRippleStyles=function(t){if(null!==this.rippleElement_){var s,i,n,a="translate("+this.x_+"px, "+this.y_+"px)";t?(i=this.Constant_.INITIAL_SCALE,n=this.Constant_.INITIAL_SIZE):(i=this.Constant_.FINAL_SCALE,n=this.rippleSize_+"px",e&&(a="translate("+this.boundWidth/2+"px, "+this.boundHeight/2+"px)")),s="translate(-50%, -50%) "+a+i,this.rippleElement_.style.webkitTransform=s,this.rippleElement_.style.msTransform=s,this.rippleElement_.style.transform=s,t?this.rippleElement_.classList.remove(this.CssClasses_.IS_ANIMATING):this.rippleElement_.classList.add(this.CssClasses_.IS_ANIMATING)}},this.animFrameHandler=function(){this.frameCount_-- >0?window.requestAnimationFrame(this.animFrameHandler.bind(this)):this.setRippleStyles(!1)})}},s.register({constructor:y,classAsString:"MaterialRipple",cssClass:"mdl-js-ripple-effect",widget:!1})}();

'use strict';

if ('serviceWorker' in navigator) {  
  navigator.serviceWorker.register('/sw.js');
}




Crie um arquivo que deverá estar no diretório raiz do site (/) e deverá se chamar sw.js e coloque o seguinte código:


'use strict';
const NAME = 'CHACHE';
const VERSION = '0.0.1';
const currentCacheName = NAME + '-v' + VERSION;
const cacheManifest = [
  "<!--URL 1-->",
  "<!--URL 2-->",
  "<!--URL 3-->"
];

self.addEventListener('install', function(e) {
  e.waitUntil(
    caches.open(currentCacheName).then(function(cache) {
      console.log('[CACHE] '+currentCacheName+' Intalado com sucesso');
      return cache.addAll(cacheManifest);
    })
  );
  self.skipWaiting();
});

self.addEventListener('activate', function(){
  caches.keys().then(cacheNames => {
    return Promise.all(cacheNames.map(function(cacheName){
        if (cacheName.indexOf(NAME) === -1) {
          return null;
        }

        if (cacheName !== currentCacheName) {
          console.log('[CACHE] '+cacheName+' que estava desatualizado removido com sucesso');
          return caches.delete(cacheName);
        }

        return null;
      })
    );
  });
  self.clients.claim();
});

self.addEventListener('fetch', function(event) {
    event.respondWith(fetch(event.request).catch(function(e) {
      let out = 'Desculpe houve um erro durante a requisção !';
      return new Response(JSON.stringify(out));
    }));
    return;
});


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