pace ==== Include [pace.js](https://raw.github.com/HubSpot/pace/v0.5.3/pace.min.js) and the [theme](http://github.hubspot.com/pace/docs/welcome/) css of your choice on your page (as early as is possible), and you're done! Pace will automatically monitor your ajax requests, event loop lag, document ready state, and elements on your page to decide the progress. On ajax navigation it will begin again! If you use AMD or Browserify, require in pace.js and call `pace.start()` as early in the loading process as is possible. Install with Eager ------------------ The easiest way to add Pace to your site is with [Eager](http://eager.io). Click Install to see a live preview of Pace on your website. Example ------- ```html ``` Configuration ------------- Pace is fully automatic, no configuration is necessary to get started. If you would like to make some tweaks, here's how: You can set `window.paceOptions` before bringing in the file: ```javascript paceOptions = { // Disable the 'elements' source elements: false, // Only show the progress on regular and ajax-y page navigation, // not every request restartOnRequestAfter: false } ``` You can also put options on the script tag: ```html ``` If you're using AMD or Browserify, you can pass your options to `start`: ```javascript define(['pace'], function(pace){ pace.start({ document: false }); }); ``` Themes ------ Pace includes a bunch of [themes](http://github.hubspot.com/pace/docs/welcome/) to get you started. Just include the appropriate css file. Send us a PR with any interesting themes you create. Collectors ---------- Collectors are the bits of code which gather progress information. Pace includes four default collectors: - Ajax Monitors all ajax requests on the page - Elements Checks for the existance of specific elements on the page - Document Checks the document readyState - Event Lag Checks for event loop lag signaling that javascript is being executed They can each be configured or disabled through configuration options of the same name. ```javascript paceOptions = { ajax: false, // disabled document: false, // disabled eventLag: false, // disabled elements: { selectors: ['.my-page'] } }; ``` Add your own classes to `paceOptions.extraSources` to add more sources. Each source should either have a `.progress` property, or a `.elements` property which is a list of objects with `.progress` properties. Pace will automatically handle all scaling to make the progress changes look smooth to the user. Elements -------- Elements being rendered to the screen is one way for us to decide that the page has been rendered. If you would like to use that source of information (not required at all), specify one or more selectors. You can comma seperate the selectors to propertly handle error states, where the progress bar should disappear, but the element we are looking for may never appear: ```javascript paceOptions = { elements: { selectors: ['.timeline,.timeline-error', '.user-profile,.profile-error'] } } ``` Pace will consider the elements test successful when each selector matches something. For this example, when either `.timeline` or `.timeline-error` exist, and either `.user-profile` or `.profile-error` exist. Restart Rules ------------- Most users want the progress bar to automatically restart when a pushState event occurs (generally means ajax navigation is occuring). You can disable this: ```javascript paceOptions = { restartOnPushState: false } ``` You can also have pace restart on every ajax request which lasts longer than x ms. You'll want to disable this if you make ajax requests the user doesn't need to know about, like precaching: ```javascript paceOptions = { restartOnRequestAfter: false } ``` You can always trigger a restart manually by calling `Pace.restart()` See [the source](https://github.com/HubSpot/pace/blob/master/pace.coffee) for a full list of all options. API --- Pace exposes the following methods: - `Pace.start`: Show the progress bar and start updating. Called automatically if you don't use AMD or CommonJS. - `Pace.restart`: Show the progress bar if it's hidden and start reporting the progress from scratch. Called automatically whenever `pushState` or `replaceState` is called by default. - `Pace.stop`: Hide the progress bar and stop updating it. - `Pace.track`: Explicitly track one or more requests, see Tracking below - `Pace.ignore`: Expliticly ignore one or more requests, see Tracking below Events ------ Pace fires the following events: - `start`: When pace is initially started, or as a part of a restart - `stop`: When pace is manually stopped, or as a part of a restart - `restart`: When pace is restarted (manually, or by a new AJAX request) - `done`: When pace is finished - `hide`: When the pace is hidden (can be later than `done`, based on `ghostTime` and `minTime`) You can bind onto events using the `on`, `off` and `once` methods: - `Pace.on(event, handler, [context])`: Call `handler` (optionally with context) when `event` is triggered - `Pace.off(event, [handler])`: Unbind the provided `event` and `handler` combination. - `Pace.once(event, handler, [context])`: Bind `handler` to the next (and only the next) incidence of `event` Tracking -------- By default, Pace will show any ajax requests which begin as a part of a normal or ajax-y page load, or which last longer than 500ms. You can disable all ajax tracking by setting `ajax` to false: ```javascript Pace.options = { ajax: false } ``` You can disable ajax tracking except on page navigation by setting `restartOnRequestAfter` to false: ```javascript Pace.options = { restartOnRequestAfter: false } ``` You can manually disable tracking for a specific request or requests by triggering them within a `Pace.ignore` callback: ```javascript Pace.ignore(function(){ $.ajax(...) }); ``` You can force the progress bar to be shown for a specific request by triggering them within a `Pace.track` callback: ```javascript Pace.track(function(){ $.ajax(...) }); ``` You can also ignore URLs based on a pattern: ```javascript Pace.options = { ajax: { ignoreURLs: ['some-substring', /some-regexp/] } } ``` Dependencies ------------ None! Support ------- Pace is designed to support IE8+ (standards mode), FF 3.5+, Chrome, Safari 4+, Opera 10.5+, and all modern mobile browsers. If you run into a compatibility issue, or can make a case for supporting something else, please create an issue. Size ---- pace.js is 4kb minified and gzipped. The themes vary between 0.5 and 4kb. Issues ------ We have obviously not tested this on every website. If you run into an issue, or find a way the automatic detection could be better, please [create an Issue](https://github.com/HubSpot/pace/issues/new). If you can include a test case, that's even better. Contributing ------------ PRs Welcome! Building requires node.js. ```bash npm install grunt ``` You can also run `grunt watch` to have it automatically build as you make changes. There is no need to include compiled files in PRs. Credits ------- [HubSpot](http://dev.hubspot.com) Javascript by [Zack Bloom](http://twitter.com/zackbloom) CSS by [Adam Schwartz](http://twitter.com/adamfschwartz) Themes inspired by [Mary Lou](http://tympanus.net/codrops/2013/09/18/creative-loading-effects/) Project inspired by [nprogress](http://ricostacruz.com/nprogress/)