React Prevent Scroll On Render

(video) Ceremonia ancestral Por Enrique Coria - Tuesday, Sep. If you’d like to start using the new component APIs introduced in React 16. This is why React splits all work into the "render phase" and the "commit phase". In this post I'll be going over how to create a fullscreen background image for your views in React Native. NativeBase provides its own frame component, named after. findDOMNode(ref) to get the DOM node. Now that you've familiarized yourself with the basics of how to work with React, let's kick things up a few notches. You're totally safe because React only renders the DOM within #app and doesn't care about what happens in its parent. I was wondering if it's currently possible to render the Swiper pagination in a different position. 5, use [email protected] Hopefully you've learned a little about CSS Variables and React. Introducing React Loadable React Loadable is a small library I wrote to make component-centric code splitting easier in React. Welcome to React. There are all the examples for react-bootstrap-table. This is because React uses a virtual DOM instead of the real one, and allows us to render our components to markup. React is one of the three rendering libraries supported by Meteor; the alternatives are Blaze and Angular. Default configs are in the SchedulerData. As you know, Flatlist inherits props of ScrollView component. In order to constrain memory and enable smooth scrolling, content is rendered asynchronously offscreen. The updated React project template provides a convenient starting point for ASP. If your render() method depends on some other data, you can tell React that the component needs re-rendering by calling forceUpdate(). hydrate to mount your components. Here's a walkthrough that shows how to build a header that is animated with the scroll position of a The idea is to render a header over the. use-scroll-position is a React hook that returns the browser viewport X and Y scroll position. React is an abstraction over the DOM and as any abstraction, it has its costs and limitations that you may hit sooner or later. In this post I'll be going over how to create a fullscreen background image for your views in React Native. As an example, take an app drawer with a large number of items that the user may have to scroll through. If you’re familiar with React Router you know that to do that, you pass Route a path and a component to render when the app’s location matches that path. The world's leading companies use Next. Redux on the Server When using Redux with server rendering, we must also send the state of our app along in our response, so the client can use it as the initial state. React is a JavaScript presentation library created by Facebook and used at AirBnB, Instagram, NetFlix, and PayPal, among others. In more abstract terms, integrating React Native with UI layout systems that expect synchronous rendering is harder today. js CSS Transitions on initial render February 5, 2015 April 13, 2015 — John Cobb In this post I’m going to explore a quick solution to applying React. wheel Equivalent of mousewheel. In some cases, when the javascript bundle arrives much later than the HTML&CSS it might cause a flickering. So in this tutorial we would going to create a react native app with Full Page Width Swipeable Horizontal ScrollView in both Android and iOS application example tutorial using pagingEnabled = { true } prop. @Héctor Ramos: This is an issue with FlatList, as has been mentioned by many people in that issue and in the others linked above. This may be useful if you are using server-side rendering and use ReactDOM. Synopsis The remote device is missing a vendor-supplied security patch Description According to its self-reported version, Cisco IOS XE Software is affected by a vulnerability in the filesystem which allows an authenticated, local attacker within the IOx Guest Shell to modify the namespace container protections on an affected device. But we can prevent scrolling by event. Scroll props withScroll() WindowSize. Or more specifically - by our component's state and user's ability to change that state by interacting with rendered radio buttons. 24: React, Infinite Scrolling, Render what you show What I Learned Today - Atomic Jolt. Modal's "trap" focus in them, ensuring the keyboard navigation cycles through the modal, and not the rest of the page. In my react component I display a long list of data and few links at the bottom. A community for learning and developing web applications using React by Facebook. Now today we are going to learn about something new in Horizontal ScrollView, things you can do with Horizontal ScrollView. PgUp PgDown Home End and arrow keys are captured. Or when you have tabs linked to each slide. In more abstract terms, integrating React Native with UI layout systems that expect synchronous rendering is harder today. My problem is that when I want to scroll by clicking on the scrollbar those events are then. The off-canvas nav menu (hamburger button) right here is a perfect example. If you’d like to start using the new component APIs introduced in React 16. Easily add to existing projects or use it for brand new solutions Available for plain Javascript , jQuery and jQuery Mobile , Angular JS , Angular , Ionic , React and for anywhere where Javascript runs. React is amazing on the client side, but it's ability to be rendered on the server side makes it truly special. How to use the React DevTools and React's profiling build to properly profile a production app. React iScroll. handleClick so you want to bind it. use-scroll-position is a React hook that returns the browser viewport X and Y scroll position. React Bootstrap will take care of the proper ARIA roles for you. * Prevent demihumans from destroying humanity. React Select. This is an Example of React Native Add Items to ScrollView using Loop. A control to render list with swipeable items. How can one prevent scrolling when the off-canvas menu is open? I want the focus to be on the content of the nav menu when it’s open, so I want to limit/lock the visitor’s ability to scroll and distract themselves. There you have a clean focus call based on React lifecycle. NET Core as the back end support. 0 is released! With it comes a host of new features including the two big ones: React. Learn how to make your apps more secure with React Authentication.  The easiest way is a simple CSS snippet: Preventing overflow on the entire   assures scrolling on elements other than the desired fixed or absolute element wont happen. React and React-DOM's npm packages include standalone. A dropdown can have its menu scroll. vs - which one to use? ScrollView simply renders all its react child components at once. However, you can choose to use the entire window as the scroll container or make React Infinite like a chatbox with the following options. I'm still figuring things out with React-Native, but yesterday I was working on getting a form to automatically scroll in order to prevent the keyboard from covering the fields being entered. link Creating items in the viewport *cdkVirtualFor replaces *ngFor inside of a , supporting the exact same API as *ngFor. This type of task can be used while making any form which has interdependent fields like F1 needs to be filed before F2, so in that case, you can disable F2 until the user fill the field F1. To disable cell recycling on specific cells, exclude the template field from the item descriptor. That makes it very easy to understand and use. In this chapter, we will discuss component lifecycle methods. About HTML Preprocessors. So in this tutorial we would going to create a react native app with Full Page Width Swipeable Horizontal ScrollView in both Android and iOS application example tutorial using pagingEnabled = { true } prop. 06 May 2019 React hook which gives a smooth scrolling function. It appears the component has logic, could have a state too and that means a snapshot test would not be our best choice. As you can see we put some dummy month and year at the top for now and outputted this. In order to constrain memory and enable smooth scrolling, content is rendered asynchronously offscreen. Questions: I have a problem, which I have no ideas, how to solve. While React Native may not prevent scrolling long lists, it would still display no content if such lists are really long, and are scrolled really fast. If you encounter any errors with the JavaScript, you may want to temporarily disable server-side rendering in order to debug your components in your browser. Our components are controlled by us. WELCOME TO MAC. Let's say that you wanted to render out a list of items in a 2 column structure. My name is Alan Chan. text: String: No: Text will be displayed in button. scroll(options) Parameters. There are all the examples for react-bootstrap-table. preventDefault() in it, then the scroll won't start. Scroll boundaries and scroll chaining Scroll chaining on Chrome Android. But if the DOM Node already contains content rendered by React, this content will be updated to reflect the new React Element. Be specific. Re-rendering often isn't necessarily a bad thing; components are typically small, focused, and cheap. Many devs don’t realize this initially, but setState is asynchronous. The React DevTools is an amazing piece of software and is available as a browser extension for Chrome, Firefox, and is capable of being wired up to work with React app's anywhere. How to use the React DevTools and React's profiling build to properly profile a production app. If you set some state, than take a look at it, you will still see the old state. Then it’ll proceed to perform the DOM operations that will make the tree show up in the browser. to - target to scroll to. I prevent a function from. React Native - ScrollView - In this chapter, we will show you how to work with the ScrollView element. NET Core series. React only writes patch updates to the DOM, but never reads from it. In this Example, we will make a TextInput Enable/Disable on a click of a button. The magic of it all: as long as we render Item with the same props and into the same node on both the client and server, React won't actually re-render the component (which would be less performant)—it's smart enough to realize that the rendered Item already exists in the DOM and simply note that it may need to be re-rendered in the future. As the Grid is a React component it is easy to extend and add custom functionality. Updated react-router-scroll. Bug tracker Roadmap (vote for features) About Docs Service status. js: Getting Started. You can see that after therender() function, the componentDidMount() function will be called by React. react-test-renderer is a library for rendering React components to pure JavaScript objects but it can do a lot more than creating objects. In this article, we address some of the performance issues of. Synopsis The remote device is missing a vendor-supplied security patch Description According to its self-reported version, Cisco IOS XE Software is affected by a vulnerability in the filesystem which allows an authenticated, local attacker within the IOx Guest Shell to modify the namespace container protections on an affected device. How to add `onscroll` event in ReactJS component. While I'll be focusing on fullscreen images in particular, this will actually directly apply to any background image, fullscreen or not. initialHeight=initialHeight;this. Problem with React rarely is React itself but the whole ecosystem behind it or around it. link Creating items in the viewport *cdkVirtualFor replaces *ngFor inside of a , supporting the exact same API as *ngFor. When there is a large number of records to be fetched for a particular query and because fetching such huge data and rendering on the screen will downgrade the application performance. ``o= `` Set AVOptions on the SwrContext or AVAudioResampleContext. The only way to do this via props is to double-render (unset and then reset). React Router is a routing library which allows you to add new screen flows to your application, and it also keeps URL in sync with what’s being shown on the page. I successfully get data from SharePoint pnp bu in react data is not loaded. React will take care of making sure only the right bits of the DOM are updated, making the whole thing efficient. For example, say we had a list of albums and we wanted to render them a full page 2 column list. Bug tracker Roadmap (vote for features) About Docs Service status. The server-rendered HTML will automatically be reused by React client-side, meaning your initial render will be super fast. The off-canvas nav menu (hamburger button) right here is a perfect example. dates to see if all expected dates are in the state. There are some syntactic differences: React events are named using camelCase, rather than lowercase. As you can see we put some dummy month and year at the top for now and outputted this. NET Core series. React-bootstrap-table is a Bootstrap table component rebuilt by React. Scrolling right. Piece of cake: prevent the scroll from reaching the first and the last pixel of the scroll height. Nested modals aren't supported, but if you really need them the underlying react-overlays can support them if you're willing. containerId - container to listen for scroll events and to perform scrolling in. The generated code will be React elements instead of a string of HTML. Though we can’t do those things in the render method, they’re still pretty critical for building a React app. js CSS Transitions on initial render February 5, 2015 April 13, 2015 — John Cobb In this post I’m going to explore a quick solution to applying React. The series of React tutorials focuses on building a complex yet elegant and powerful React component. Some caveats: Internal state is not preserved when content scrolls out of the render window. rendering a huge amount of data in a table, bootstrap modal causes the whole table to re-render which induces a lot of ui lag when a button is clicked to open said modal (self. Component Description Replacing Component Toggle the visibility of content across items of your screen - dataArray; Array of data chunks to render iteratively. 3 (or if you're a maintainer looking to update your library in advance) here are a few examples that we hope will help you to start thinking about components a bit differently. containerId - container to listen for scroll events and to perform scrolling in. 4 Step 3: Create a Bootstrap Table2 with Static Data. More fully, from the React docs: Render a ReactElement to its initial HTML. createClass method to create component classes, and released a small syntax sugar update to allow for better use with ES6 modules by extends React. In this chapter, we will discuss component lifecycle methods. JavaScript preprocessors can help make authoring JavaScript easier and more convenient. @Héctor Ramos: This is an issue with FlatList, as has been mentioned by many people in that issue and in the others linked above. Note that we use this Context only for browser side hydration and this won’t change. You're totally safe because React only renders the DOM within #app and doesn't care about what happens in its parent. By default, toolbar is float at the top of the RichTextEditor. Scroll boundaries and scroll chaining Scroll chaining on Chrome Android. React only writes patch updates to the DOM, but never reads from it. Interested in building mobile apps using React Native? Check out /r/reactnative! New to React? Here are great, free resources! Read the official Getting Started page on the docs /u/acemarke's suggested resources for learning React; Kent Dodds' Egghead. As an example, take an app drawer with a large number of items that the user may have to scroll through. See the SyntheticEvent reference guide to learn more. Here’s a walkthrough that shows how to build a header that is animated with the scroll position of a The idea is to render a header over the. For better understanding of React Native concepts, we will borrow a few lines from the official documentation − React Native lets you build mobile apps using only JavaScript. It does require us to jump outside the lifecycle a little and the results may vary. It is safe to interrupt and in the future will be asynchronous. These are elements nested in JSX code as if they represented a widget's sub-elements, but from the technical point of view, they only carry the configuration data. Fetching data with Apollo Client guides you to structure your code in a predictable, declarative way consistent with modern React best practices. js environment and already has all of npm's 400,000 packages pre-installed, including react-scroll-selectable with all npm packages installed. Instead of having Square as a functional stateless component as before:. As you can see we put some dummy month and year at the top for now and outputted this. You can use the as prop to render whatever your heart desires. vs - which one to use? ScrollView simply renders all its react child components at once. If you depends on older react < 15. An SPA might have multiple views (aka pages), and unlike the conventional multi-page apps, navigating through these views shouldn’t result in the entire page being reloaded. There are two other properties which can replace the component property to tell the Route component what it needs to render when there is a match: render property:a function that return a React element. The first solution used to prevent a component from rendering in React is called shouldComponentUpdate. React with Server Side Rendering is part 4 of a 5 parts React with ASP. Create Horizontal ScrollView in React Native Tutorial Android iOS admin June 21, 2017 June 21, 2017 React Native How to add multiple View, Images and Text inside Horizontal ScrollView in React Native application and change ScrollView background color using color style. You're totally safe because React only renders the DOM within #app and doesn't care about what happens in its parent. React modal dialog is an idiomatic way to represent modal dialogs in react. In this short and easy tutorial, we will take a look at how to use React Context, React and React Router to build awesome multilingual website. Often in React you want to render a series of components when a button is clicked. In this case, use the onsenui and react-onsenui packages, in addition to react and react-dom npm packages. Supports pointer interaction. setState({data: data}); UPDATE: Why does the UI scroll to the top for some renders, but not others?. You can page-scroll alternate axis with Shift + PgUp and Shift + PgDown shortcuts. In order to use create-react-app you need Node. We'll explore how to use Unified, Remark, Rehype, and PrismJS to create markdown code that is capable of being syntax highlighted. If you’d like to start using the new component APIs introduced in React 16. Pass a React Component as the wrapper option to have it rendered around the inner element. In Part One, we set up our app and covered basic messaging. The structure. I successfully get data from SharePoint pnp bu in react data is not loaded. I have a div that is scrollable unfortunately I also have event associated with onMouseDown on the div. As an example, take an app drawer with a large number of items that the user may have to scroll through. But again, from your example code this is not clear. In Part One, we set up our app and covered basic messaging. Now that you've familiarized yourself with the basics of how to work with React, let's kick things up a few notches. use-scroll-position is a React hook that returns the browser viewport X and Y scroll position. rendering a big application server-side can be quite resource-intensive, and under heavy load it could even provide a slower experience than client-side rendering, since you have a single bottleneck; A very simplistic example of what it takes to Server-Side render a React app. One important thing to keep in mind when returning null is that even though the component doesn't show up, its lifecycle methods are still fired. There is no manual adding or removing of anything. findDOMNode(ref) to get the DOM node. You as the developer can use whichever method you want. var qsProxy = {"location":"{{post_title}}"}; function FrameBuilder(formId,appendTo,initialHeight,iframeCode,title,embedStyleJSON){this. The scrollable items need not be homogeneous, and you can scroll both vertically and horizontally (by setting the horizontal property). componentDidMount is executed after the first render only on the client side. Thus, for example, one could use this library for server-side rendering and for client-side previewing. If your render() method depends on some other data, you can tell React that the component needs re-rendering by calling forceUpdate(). Understanding and being able to overcome such limitations are important parts of working with an abstraction. Here is an example to Scroll to the Top or Bottom of the ListView in React Native on the Click of Button. "Easy" to make thing safe is one of React philosophy. So on every scroll, the render method will be called, leading to an unnecessary overhead. If you set some state, than take a look at it, you will still see the old state. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.  Pass on scroll  events and preventDefault  or stopPropagation, that wont work. wheel Equivalent of mousewheel. The CSS solution stated in “Level 1” isn’t going to be. Could not find anywhere in the documentation. This is because React uses a virtual DOM instead of the real one, and allows us to render our components to markup. Rendering large lists with react-virtualized or react-window - Duration: 10:18. Our support forums are a great place to ask a question, learn and discover new ways to use Firefox. When Brad pitched me this, he pointed out there are a good amount of tutorials on getting started in React, but not as much about where to go from there. Summary: Don't scroll parent component when Modal is opened Steps to reproduce: Implement a Modal Open the Modal The parent component of the Modal is still scrollable while the Modal is open Expected behavior: The Component that calls th. Contribute to jossmac/react-scrolllock development by creating an account on GitHub. While it’s not difficult to hack together a solution, I recently came across one method that was particularly…. As far as this being an issue, rather than a feature request, it was "escalated" to this board due to being such painful and common issue when this was Product Pains (before the title of this website was changed to "Feature Requests"). Whether you enable or - disable this is essentially a matter of taste, but the default uses - the safer choice. This type of task can be used while making any form which has interdependent fields like F1 needs to be filed before F2, so in that case, you can disable F2 until the user fill the field F1. React Navigation is built and funded by Expo, with contributions from the community. This tutorial is part of the Learning React JS series. With React, typically you only need to bind the methods you pass to other components. When you put a setState() call in componentDidMount() then you are causing the entire component tree be re-rendered not only the current component - not to forget, the current component did just finished with rendering. Because React Router’s vision is aligned with React’s, programmatically navigating with React Router should, by definition, align with those three core concepts. config object, we can modify them when needed. react-virtualized-dnd is a React-based, fully virtualized drag-and-drop framework, enabling the the cross over of great user interaction and great performance. Contribute to jossmac/react-scrolllock development by creating an account on GitHub. You can apply CSS to your Pen from any stylesheet on the web. So in this tutorial we would going to Create Global Scope Variables in React Native used it between multiple Activities. Our support forums are a great place to ask a question, learn and discover new ways to use Firefox. There are 16970 observable variables and NO actionable varia. There are one thousand comments in the app, but it only shows around ten at any moment (the ones that fit on the screen), until you scroll to show more. Figure: ReactJS Tutorial – React Features. 3 Step 2: Install react-bootstrap-table2. Making a Cog Icon Icon sketch made using a salt shaker, Sixpoint can, and a quarter. Now React will render our radio buttons differently. JSFiddle or its authors are not responsible or liable for any loss or damage of any kind during the usage of provided code. What that means is when you want to create a new route, you render a Route component. With Apollo, you can build high-quality features faster without the hassle of writing data plumbing boilerplate. React Bootstrap will take care of the proper ARIA roles for you. I prevent a function from. ES6 syntax is easier to manage especially for smaller to-do apps. But, that introduces a performance issue: When scrolling on a page that has background-attachment: fixed;, the browser will continuously repaint while you’re scrolling. Using Purecomponent To Prevent Wasted Renders In React 27 Mar 2017. When the location changes, these components should be used in the context of new location objects to re-render. The shouldComponentUpdate is not blindly called for all the rendered items for new updated items from top to b. Change the timeout value to alter the scrolling speed in milliseconds. They can be used together if you wish. JSFiddle or its authors are not responsible or liable for any loss or damage of any kind during the usage of provided code. Prevent Body Scrolling Building Resilient Systems on AWS : Learn how to design and implement a resilient, highly available, fault-tolerant infrastructure on AWS. com, we get IT — and so can you. Introducing React Loadable React Loadable is a small library I wrote to make component-centric code splitting easier in React. For simplicity, I put it in react state object, you'd better put it in react props object when using. A scroll event is sent whenever the element's scroll position changes, regardless of the cause. It currently always renders below the swiper-wrapper div. React Native: Prevent keyboard from hiding TextInput fields on the bottom of the screen Posted on 12 July 2016 When we have an input field on the bottom of the screen and we focus it, the keyboard covers the field and we will not know what we are typing inside. About HTML Preprocessors. This is a simple example where we will only use one component. Deku Next up, we’ll implement the same component with Deku. setState calls don't look asynchronous, and naively calling setState introduces very subtle bugs. reactstrap - easy to use React Bootstrap 4 components compatible with React 16+. Trying to have the browser scroll to the top upon cliking a router. On the first call to ReactDOM. When you put a setState() call in componentDidMount() then you are causing the entire component tree be re-rendered not only the current component - not to forget, the current component did just finished with rendering. How to disable document body from scrolling I am using the new slider controls in a webform; however, these slider controls make the entire document scrol. All scrolling must be initiated through user agent scrolling mechanisms (e. If true, it will ignore native scroll container. Pass a React Component as the wrapper option to have it rendered around the inner element. requires an image with wrapped markup:. Server side rendering is an advanced React topic. Syntax window. 13 introduced a major change in how you can define your component classes. renderToString(ReactElement element) -> string: In short, creates all the html we need on the server. The ScrollView is a generic scrolling container that can host multiple components and views. To summarize, there are 3 issues when using setState:. Each of these items is a separate component. It currently always renders below the swiper-wrapper div. This part introduces infinite scroll in React in an elegant way by using higher order components. Example: View React Storybook Examples Install. smooth - animate the scrolling. React iScroll. Migrating from Legacy Lifecycles. I was preparing a blog post on a subject related to React re-renders when I stumbled upon this little React gem of knowledge I think you'll really appreciate: If you give React the same element you gave it on the last render, it wont bother re-rendering that element. Render clickable links with React Native. See the SyntheticEvent reference guide to learn more. lazy(): Code-splitting and lazy-loading with React Suspense; We'll focus on React. The Yahoo! Exceptional Performance team ran an experiment to determine the optimal method to include an external stylesheet. Since you'll be re-rendering every time there's a change, you can't go changing something while you're rendering. React is a popular library for creating single-page applications (SPAs) that are rendered on the client side. Normally components will render a HTML element. The first example is to maintain the scroll position at the bottom when an element is inserted at the bottom. For example, put country flags beside country names, or push buttons for actions. This is why React splits all work into the "render phase" and the "commit phase". You may have read that the React VirtualDom is super fast. This tutorial is the first of a three-part series on React by Brad Westfall. Introduction. There you have a clean focus call based on React lifecycle. It also supports “overdraw” to render items above and below the view port. The CSS solution stated in “Level 1” isn’t going to be. If a function is particularly expensive to run and you know it renders the same results given the same props you can use the React. In my case the component was not cheap, and it was being re-rendered a lot. When scrolling upwards, the only buffer that should be rendered is the rows at the top of the canvas. I confirmed this by selecting the “html” element in VS2015’s DOM Inspector and watching the location of the DOM highlight while scrolling. render( receives when its route is active. There are two other properties which can replace the component property to tell the Route component what it needs to render when there is a match: render property:a function that return a React element. React has a shallow learning curve and it is suitable for beginners. Use Cell Rendering to have cells rendering values other than simple strings. There is no special disabled property for DIV elements. You can browse for and follow blogs, read recent entries, see what others are viewing or recommending, and request your own blog. With this change, the render cancelation happens with blocking. It should just receive state and props and then render a UI. It’s designed to help visitors read through many posts without effort. As you can see we put some dummy month and year at the top for now and outputted this. 5, use [email protected] This is done because not all web browsers can render React (ES6+JSX) directly. Pass a React Component as the wrapper option to have it rendered around the inner element. re-render) or false (React can skip the re-render this time. After clicking on any of this links I fill in the list with new collection of the links and need to scroll to the top. Ask a Question. Default configs are in the SchedulerData. React Router uses a declarative, component-based approach to routing. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug. This is because React uses a virtual DOM instead of the real one, and allows us to render our components to markup. y! Breaking changes in version 1. link Creating items in the viewport *cdkVirtualFor replaces *ngFor inside of a , supporting the exact same API as *ngFor. This adds in the security benefits of React when it comes to rendering untrusted markdown content. reactjs) submitted 3 years ago * by ndboost. Server side rendering is an advanced React topic. React only writes patch updates to the DOM, but never reads from it. React Grid - Filtering The Grid component supports filtering data by a column value programmatically or using the value an end user types in the corresponding Filter Row editor. These are the Rules, Laws, bestowed upon those who commit their life to the great Lord Thanar. There are 16970 observable variables and NO actionable varia. This is a simple example where we will only use one component. Detect and retrieve current device Motion. The Greeter class is a React component that accepts a property greeting. One such feature is Cell Rendering. Since you'll be re-rendering every time there's a change, you can't go changing something while you're rendering. 4 Step 3: Create a Bootstrap Table2 with Static Data. 1 Configure CSS. You're totally safe because React only renders the DOM within #app and doesn't care about what happens in its parent. There you have a clean focus call based on React lifecycle. Render phase is when React calls your components and performs reconciliation. So if we scroll 700px on the screen, the render method is updated 700 times. smooth - animate the scrolling.